Line data Source code
1 : /* Copyright (C) 2000 The PARI group.
2 :
3 : This file is part of the PARI/GP package.
4 :
5 : PARI/GP is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU General Public License as published by the Free Software
7 : Foundation; either version 2 of the License, or (at your option) any later
8 : version. It is distributed in the hope that it will be useful, but WITHOUT
9 : ANY WARRANTY WHATSOEVER.
10 :
11 : Check the License for details. You should have received a copy of it, along
12 : with the package; see the file 'COPYING'. If not, write to the Free Software
13 : Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */
14 :
15 : /*******************************************************************/
16 : /* */
17 : /* BASIC NF OPERATIONS */
18 : /* */
19 : /*******************************************************************/
20 : #include "pari.h"
21 : #include "paripriv.h"
22 :
23 : #define DEBUGLEVEL DEBUGLEVEL_nf
24 :
25 : /*******************************************************************/
26 : /* */
27 : /* OPERATIONS OVER NUMBER FIELD ELEMENTS. */
28 : /* represented as column vectors over the integral basis */
29 : /* */
30 : /*******************************************************************/
31 : static GEN
32 34012755 : get_tab(GEN nf, long *N)
33 : {
34 34012755 : GEN tab = (typ(nf) == t_MAT)? nf: gel(nf,9);
35 34012755 : *N = nbrows(tab); return tab;
36 : }
37 :
38 : /* x != 0, y t_INT. Return x * y (not memory clean if x = 1) */
39 : static GEN
40 888732741 : _mulii(GEN x, GEN y) {
41 1436436738 : return is_pm1(x)? (signe(x) < 0)? negi(y): y
42 1436436738 : : mulii(x, y);
43 : }
44 :
45 : GEN
46 4669 : tablemul_ei_ej(GEN M, long i, long j)
47 : {
48 : long N;
49 4669 : GEN tab = get_tab(M, &N);
50 4669 : tab += (i-1)*N; return gel(tab,j);
51 : }
52 :
53 : /* Outputs x.ei, where ei is the i-th elt of the algebra basis.
54 : * x an RgV of correct length and arbitrary content (polynomials, scalars...).
55 : * M is the multiplication table ei ej = sum_k M_k^(i,j) ek */
56 : GEN
57 3404 : tablemul_ei(GEN M, GEN x, long i)
58 : {
59 : long j, k, N;
60 : GEN v, tab;
61 :
62 3404 : if (i==1) return gcopy(x);
63 3404 : tab = get_tab(M, &N);
64 3404 : if (typ(x) != t_COL) { v = zerocol(N); gel(v,i) = gcopy(x); return v; }
65 3404 : tab += (i-1)*N; v = cgetg(N+1,t_COL);
66 : /* wi . x = [ sum_j tab[k,j] x[j] ]_k */
67 21886 : for (k=1; k<=N; k++)
68 : {
69 18482 : pari_sp av = avma;
70 18482 : GEN s = gen_0;
71 132396 : for (j=1; j<=N; j++)
72 : {
73 113914 : GEN c = gcoeff(tab,k,j);
74 113914 : if (!gequal0(c)) s = gadd(s, gmul(c, gel(x,j)));
75 : }
76 18482 : gel(v,k) = gc_upto(av,s);
77 : }
78 3404 : return v;
79 : }
80 : /* as tablemul_ei, assume x a ZV of correct length */
81 : GEN
82 20819878 : zk_ei_mul(GEN nf, GEN x, long i)
83 : {
84 : long j, k, N;
85 : GEN v, tab;
86 :
87 20819878 : if (i==1) return ZC_copy(x);
88 20819878 : tab = get_tab(nf, &N); tab += (i-1)*N;
89 20819878 : v = cgetg(N+1,t_COL);
90 144166068 : for (k=1; k<=N; k++)
91 : {
92 123346190 : pari_sp av = avma;
93 123346190 : GEN s = gen_0;
94 1731048652 : for (j=1; j<=N; j++)
95 : {
96 1607702462 : GEN c = gcoeff(tab,k,j);
97 1607702462 : if (signe(c)) s = addii(s, _mulii(c, gel(x,j)));
98 : }
99 123346190 : gel(v,k) = gc_INT(av, s);
100 : }
101 20819878 : return v;
102 : }
103 :
104 : /* table of multiplication by wi in R[w1,..., wN] */
105 : GEN
106 34525 : ei_multable(GEN TAB, long i)
107 : {
108 : long k,N;
109 34525 : GEN m, tab = get_tab(TAB, &N);
110 34525 : tab += (i-1)*N;
111 34525 : m = cgetg(N+1,t_MAT);
112 136523 : for (k=1; k<=N; k++) gel(m,k) = gel(tab,k);
113 34525 : return m;
114 : }
115 :
116 : GEN
117 9628424 : zk_multable(GEN nf, GEN x)
118 : {
119 9628424 : long i, l = lg(x);
120 9628424 : GEN mul = cgetg(l,t_MAT);
121 9628424 : gel(mul,1) = x; /* assume w_1 = 1 */
122 30138056 : for (i=2; i<l; i++) gel(mul,i) = zk_ei_mul(nf,x,i);
123 9628424 : return mul;
124 : }
125 : GEN
126 1665 : multable(GEN M, GEN x)
127 : {
128 : long i, N;
129 : GEN mul;
130 1665 : if (typ(x) == t_MAT) return x;
131 0 : M = get_tab(M, &N);
132 0 : if (typ(x) != t_COL) return scalarmat(x, N);
133 0 : mul = cgetg(N+1,t_MAT);
134 0 : gel(mul,1) = x; /* assume w_1 = 1 */
135 0 : for (i=2; i<=N; i++) gel(mul,i) = tablemul_ei(M,x,i);
136 0 : return mul;
137 : }
138 :
139 : /* x integral in nf; table of multiplication by x in ZK = Z[w1,..., wN].
140 : * Return a t_INT if x is scalar, and a ZM otherwise */
141 : GEN
142 4548357 : zk_scalar_or_multable(GEN nf, GEN x)
143 : {
144 4548357 : long tx = typ(x);
145 4548357 : if (tx == t_MAT || tx == t_INT) return x;
146 4406573 : x = nf_to_scalar_or_basis(nf, x);
147 4406573 : return (typ(x) == t_COL)? zk_multable(nf, x): x;
148 : }
149 :
150 : GEN
151 18240 : nftrace(GEN nf, GEN x)
152 : {
153 18240 : pari_sp av = avma;
154 18240 : nf = checknf(nf);
155 18240 : x = nf_to_scalar_or_basis(nf, x);
156 18222 : x = (typ(x) == t_COL)? RgV_dotproduct(x, gel(nf_get_Tr(nf),1))
157 18240 : : gmulgu(x, nf_get_degree(nf));
158 18240 : return gc_upto(av, x);
159 : }
160 : GEN
161 835 : rnfelttrace(GEN rnf, GEN x)
162 : {
163 835 : pari_sp av = avma;
164 835 : checkrnf(rnf);
165 : /* avoid rnfabstorel special t_POL case misinterpretation */
166 830 : if (typ(x) == t_POL && varn(x) == rnf_get_varn(rnf))
167 46 : x = gmodulo(x, rnf_get_pol(rnf));
168 830 : x = rnfeltabstorel(rnf, x);
169 600 : x = (typ(x) == t_POLMOD)? rnfeltdown(rnf, gtrace(x))
170 680 : : gmulgu(x, rnf_get_degree(rnf));
171 680 : return gc_upto(av, x);
172 : }
173 :
174 : static GEN
175 30 : famatQ_to_famatZ(GEN fa)
176 : {
177 30 : GEN E, F, Q, P = gel(fa,1);
178 30 : long i, j, l = lg(P);
179 30 : if (l == 1 || RgV_is_ZV(P)) return fa;
180 6 : Q = cgetg(2*l, t_COL);
181 6 : F = cgetg(2*l, t_COL); E = gel(fa, 2);
182 30 : for (i = j = 1; i < l; i++)
183 : {
184 24 : GEN p = gel(P,i);
185 24 : if (typ(p) == t_INT)
186 12 : { gel(Q, j) = p; gel(F, j) = gel(E, i); j++; }
187 : else
188 : {
189 12 : gel(Q, j) = gel(p,1); gel(F, j) = gel(E, i); j++;
190 12 : gel(Q, j) = gel(p,2); gel(F, j) = negi(gel(E, i)); j++;
191 : }
192 : }
193 6 : setlg(Q, j); setlg(F, j); return mkmat2(Q, F);
194 : }
195 : static GEN
196 30 : famat_cba(GEN fa)
197 : {
198 30 : GEN Q, F, P = gel(fa, 1), E = gel(fa, 2);
199 30 : long i, j, lQ, l = lg(P);
200 30 : if (l == 1) return fa;
201 24 : Q = ZV_cba(P); lQ = lg(Q); settyp(Q, t_COL);
202 24 : F = cgetg(lQ, t_COL);
203 66 : for (j = 1; j < lQ; j++)
204 : {
205 42 : GEN v = gen_0, q = gel(Q,j);
206 42 : if (!equali1(q))
207 174 : for (i = 1; i < l; i++)
208 : {
209 138 : long e = Z_pval(gel(P,i), q);
210 138 : if (e) v = addii(v, muliu(gel(E,i), e));
211 : }
212 42 : gel(F, j) = v;
213 : }
214 24 : return mkmat2(Q, F);
215 : }
216 : static long
217 30 : famat_sign(GEN fa)
218 : {
219 30 : GEN P = gel(fa,1), E = gel(fa,2);
220 30 : long i, l = lg(P), s = 1;
221 108 : for (i = 1; i < l; i++)
222 78 : if (signe(gel(P,i)) < 0 && mpodd(gel(E,i))) s = -s;
223 30 : return s;
224 : }
225 : static GEN
226 30 : famat_abs(GEN fa)
227 : {
228 30 : GEN Q, P = gel(fa,1);
229 : long i, l;
230 30 : Q = cgetg_copy(P, &l);
231 108 : for (i = 1; i < l; i++) gel(Q,i) = absi_shallow(gel(P,i));
232 30 : return mkmat2(Q, gel(fa,2));
233 : }
234 :
235 : /* assume nf is a genuine nf, fa a famat */
236 : static GEN
237 30 : famat_norm(GEN nf, GEN fa)
238 : {
239 30 : pari_sp av = avma;
240 30 : GEN G, g = gel(fa,1);
241 : long i, l, s;
242 :
243 30 : G = cgetg_copy(g, &l);
244 96 : for (i = 1; i < l; i++) gel(G,i) = nfnorm(nf, gel(g,i));
245 30 : fa = mkmat2(G, gel(fa,2));
246 30 : fa = famatQ_to_famatZ(fa);
247 30 : s = famat_sign(fa);
248 30 : fa = famat_reduce(famat_abs(fa));
249 30 : fa = famat_cba(fa);
250 30 : g = factorback(fa);
251 30 : return gc_upto(av, s < 0? gneg(g): g);
252 : }
253 : GEN
254 184534 : nfnorm(GEN nf, GEN x)
255 : {
256 184534 : pari_sp av = avma;
257 : GEN c, den;
258 : long n;
259 184534 : nf = checknf(nf);
260 184534 : n = nf_get_degree(nf);
261 184534 : if (typ(x) == t_MAT) return famat_norm(nf, x);
262 184504 : x = nf_to_scalar_or_basis(nf, x);
263 184504 : if (typ(x)!=t_COL)
264 105384 : return gc_upto(av, gpowgs(x, n));
265 79120 : x = nf_to_scalar_or_alg(nf, Q_primitive_part(x, &c));
266 79120 : x = Q_remove_denom(x, &den);
267 79120 : x = ZX_resultant_all(nf_get_pol(nf), x, den, 0);
268 79120 : return gc_upto(av, c ? gmul(x, gpowgs(c, n)): x);
269 : }
270 :
271 : static GEN
272 86 : to_RgX(GEN P, long vx)
273 : {
274 86 : return varn(P) == vx ? P: scalarpol_shallow(P, vx);
275 : }
276 :
277 : GEN
278 331 : rnfeltnorm(GEN rnf, GEN x)
279 : {
280 331 : pari_sp av = avma;
281 : GEN nf, pol;
282 : long v;
283 331 : checkrnf(rnf);
284 326 : v = rnf_get_varn(rnf);
285 : /* avoid rnfabstorel special t_POL case misinterpretation */
286 326 : if (typ(x) == t_POL && varn(x) == v) x = gmodulo(x, rnf_get_pol(rnf));
287 326 : x = liftpol_shallow(rnfeltabstorel(rnf, x));
288 176 : nf = rnf_get_nf(rnf); pol = rnf_get_pol(rnf);
289 352 : x = (typ(x) == t_POL)
290 86 : ? rnfeltdown(rnf, nfX_resultant(nf,pol,to_RgX(x,v)))
291 176 : : gpowgs(x, rnf_get_degree(rnf));
292 176 : return gc_upto(av, x);
293 : }
294 :
295 : /* x + y in nf */
296 : GEN
297 12038139 : nfadd(GEN nf, GEN x, GEN y)
298 : {
299 12038139 : pari_sp av = avma;
300 : GEN z;
301 :
302 12038139 : nf = checknf(nf);
303 12038139 : x = nf_to_scalar_or_basis(nf, x);
304 12038139 : y = nf_to_scalar_or_basis(nf, y);
305 12038139 : if (typ(x) != t_COL)
306 9422217 : { z = (typ(y) == t_COL)? RgC_Rg_add(y, x): gadd(x,y); }
307 : else
308 2615922 : { z = (typ(y) == t_COL)? RgC_add(x, y): RgC_Rg_add(x, y); }
309 12038139 : return gc_upto(av, z);
310 : }
311 : /* x - y in nf */
312 : GEN
313 1217366 : nfsub(GEN nf, GEN x, GEN y)
314 : {
315 1217366 : pari_sp av = avma;
316 : GEN z;
317 :
318 1217366 : nf = checknf(nf);
319 1217366 : x = nf_to_scalar_or_basis(nf, x);
320 1217366 : y = nf_to_scalar_or_basis(nf, y);
321 1217366 : if (typ(x) != t_COL)
322 1001337 : { z = (typ(y) == t_COL)? Rg_RgC_sub(x,y): gsub(x,y); }
323 : else
324 216029 : { z = (typ(y) == t_COL)? RgC_sub(x,y): RgC_Rg_sub(x,y); }
325 1217366 : return gc_upto(av, z);
326 : }
327 :
328 : /* product of ZC x,y in (true) nf; ( sum_i x_i sum_j y_j m^{i,j}_k )_k */
329 : static GEN
330 6930091 : nfmuli_ZC(GEN nf, GEN x, GEN y)
331 : {
332 : long i, j, k, N;
333 6930091 : GEN TAB = get_tab(nf, &N), v = cgetg(N+1,t_COL);
334 :
335 34328200 : for (k = 1; k <= N; k++)
336 : {
337 27398109 : pari_sp av = avma;
338 27398109 : GEN s, TABi = TAB;
339 27398109 : if (k == 1)
340 6930091 : s = mulii(gel(x,1),gel(y,1));
341 : else
342 20468018 : s = addii(mulii(gel(x,1),gel(y,k)),
343 20468018 : mulii(gel(x,k),gel(y,1)));
344 177609717 : for (i=2; i<=N; i++)
345 : {
346 150211608 : GEN t, xi = gel(x,i);
347 150211608 : TABi += N;
348 150211608 : if (!signe(xi)) continue;
349 :
350 77102954 : t = NULL;
351 860377616 : for (j=2; j<=N; j++)
352 : {
353 783274662 : GEN p1, c = gcoeff(TABi, k, j); /* m^{i,j}_k */
354 783274662 : if (!signe(c)) continue;
355 234247867 : p1 = _mulii(c, gel(y,j));
356 234247867 : t = t? addii(t, p1): p1;
357 : }
358 77102954 : if (t) s = addii(s, mulii(xi, t));
359 : }
360 27398109 : gel(v,k) = gc_INT(av,s);
361 : }
362 6930091 : return v;
363 : }
364 : static int
365 45845294 : is_famat(GEN x) { return typ(x) == t_MAT && lg(x) == 3; }
366 : /* product of x and y in nf */
367 : GEN
368 20800891 : nfmul(GEN nf, GEN x, GEN y)
369 : {
370 : GEN z;
371 20800891 : pari_sp av = avma;
372 :
373 20800891 : if (x == y) return nfsqr(nf,x);
374 :
375 19780955 : nf = checknf(nf);
376 19780955 : if (is_famat(x) || is_famat(y)) return famat_mul(x, y);
377 19780690 : x = nf_to_scalar_or_basis(nf, x);
378 19780690 : y = nf_to_scalar_or_basis(nf, y);
379 19780690 : if (typ(x) != t_COL)
380 : {
381 14033279 : if (isintzero(x)) return gen_0;
382 11742040 : z = (typ(y) == t_COL)? RgC_Rg_mul(y, x): gmul(x,y); }
383 : else
384 : {
385 5747411 : if (typ(y) != t_COL)
386 : {
387 1562075 : if (isintzero(y)) return gen_0;
388 883945 : z = RgC_Rg_mul(x, y);
389 : }
390 : else
391 : {
392 : GEN dx, dy;
393 4185336 : x = Q_remove_denom(x, &dx);
394 4185336 : y = Q_remove_denom(y, &dy);
395 4185336 : z = nfmuli_ZC(nf,x,y);
396 4185336 : dx = mul_denom(dx,dy);
397 4185336 : if (dx) z = ZC_Z_div(z, dx);
398 : }
399 : }
400 16811321 : return gc_upto(av, z);
401 : }
402 : /* square of ZC x in nf */
403 : static GEN
404 6220188 : nfsqri_ZC(GEN nf, GEN x)
405 : {
406 : long i, j, k, N;
407 6220188 : GEN TAB = get_tab(nf, &N), v = cgetg(N+1,t_COL);
408 :
409 33123470 : for (k = 1; k <= N; k++)
410 : {
411 26903282 : pari_sp av = avma;
412 26903282 : GEN s, TABi = TAB;
413 26903282 : if (k == 1)
414 6220188 : s = sqri(gel(x,1));
415 : else
416 20683094 : s = shifti(mulii(gel(x,1),gel(x,k)), 1);
417 205441554 : for (i=2; i<=N; i++)
418 : {
419 178538272 : GEN p1, c, t, xi = gel(x,i);
420 178538272 : TABi += N;
421 178538272 : if (!signe(xi)) continue;
422 :
423 65987259 : c = gcoeff(TABi, k, i);
424 65987259 : t = signe(c)? _mulii(c,xi): NULL;
425 532321845 : for (j=i+1; j<=N; j++)
426 : {
427 466334586 : c = gcoeff(TABi, k, j);
428 466334586 : if (!signe(c)) continue;
429 180886729 : p1 = _mulii(c, shifti(gel(x,j),1));
430 180886729 : t = t? addii(t, p1): p1;
431 : }
432 65987259 : if (t) s = addii(s, mulii(xi, t));
433 : }
434 26903282 : gel(v,k) = gc_INT(av,s);
435 : }
436 6220188 : return v;
437 : }
438 : /* square of x in nf */
439 : GEN
440 5178126 : nfsqr(GEN nf, GEN x)
441 : {
442 5178126 : pari_sp av = avma;
443 : GEN z;
444 :
445 5178126 : nf = checknf(nf);
446 5178126 : if (is_famat(x)) return famat_sqr(x);
447 5178126 : x = nf_to_scalar_or_basis(nf, x);
448 5178126 : if (typ(x) != t_COL) z = gsqr(x);
449 : else
450 : {
451 : GEN dx;
452 2264330 : x = Q_remove_denom(x, &dx);
453 2264330 : z = nfsqri_ZC(nf,x);
454 2264330 : if (dx) z = RgC_Rg_div(z, sqri(dx));
455 : }
456 5178126 : return gc_upto(av, z);
457 : }
458 :
459 : /* x a ZC, v a t_COL of ZC/Z */
460 : GEN
461 153234 : zkC_multable_mul(GEN v, GEN x)
462 : {
463 153234 : long i, l = lg(v);
464 153234 : GEN y = cgetg(l, t_COL);
465 603237 : for (i = 1; i < l; i++)
466 : {
467 450003 : GEN c = gel(v,i);
468 450003 : if (typ(c)!=t_COL) {
469 0 : if (!isintzero(c)) c = ZC_Z_mul(gel(x,1), c);
470 : } else {
471 450003 : c = ZM_ZC_mul(x,c);
472 450003 : if (ZV_isscalar(c)) c = gel(c,1);
473 : }
474 450003 : gel(y,i) = c;
475 : }
476 153234 : return y;
477 : }
478 :
479 : GEN
480 24775 : nfC_multable_mul(GEN v, GEN x)
481 : {
482 24775 : long i, l = lg(v);
483 24775 : GEN y = cgetg(l, t_COL);
484 165322 : for (i = 1; i < l; i++)
485 : {
486 140547 : GEN c = gel(v,i);
487 140547 : if (typ(c)!=t_COL) {
488 110597 : if (!isintzero(c)) c = RgC_Rg_mul(gel(x,1), c);
489 : } else {
490 29950 : c = RgM_RgC_mul(x,c);
491 29950 : if (QV_isscalar(c)) c = gel(c,1);
492 : }
493 140547 : gel(y,i) = c;
494 : }
495 24775 : return y;
496 : }
497 :
498 : GEN
499 89392 : nfC_nf_mul(GEN nf, GEN v, GEN x)
500 : {
501 : long tx;
502 : GEN y;
503 :
504 89392 : x = nf_to_scalar_or_basis(nf, x);
505 89392 : tx = typ(x);
506 89392 : if (tx != t_COL)
507 : {
508 : long l, i;
509 66462 : if (tx == t_INT)
510 : {
511 63328 : long s = signe(x);
512 63328 : if (!s) return zerocol(lg(v)-1);
513 59482 : if (is_pm1(x)) return s > 0? leafcopy(v): RgC_neg(v);
514 : }
515 21424 : l = lg(v); y = cgetg(l, t_COL);
516 154897 : for (i=1; i < l; i++)
517 : {
518 133473 : GEN c = gel(v,i);
519 133473 : if (typ(c) != t_COL) c = gmul(c, x); else c = RgC_Rg_mul(c, x);
520 133473 : gel(y,i) = c;
521 : }
522 21424 : return y;
523 : }
524 : else
525 : {
526 : GEN dx;
527 22930 : x = zk_multable(nf, Q_remove_denom(x,&dx));
528 22930 : y = nfC_multable_mul(v, x);
529 22930 : return dx? RgC_Rg_div(y, dx): y;
530 : }
531 : }
532 : static GEN
533 5819 : mulbytab(GEN M, GEN c)
534 5819 : { return typ(c) == t_COL? RgM_RgC_mul(M,c): RgC_Rg_mul(gel(M,1), c); }
535 : GEN
536 1665 : tablemulvec(GEN M, GEN x, GEN v)
537 : {
538 : long l, i;
539 : GEN y;
540 :
541 1665 : if (typ(x) == t_COL && RgV_isscalar(x))
542 : {
543 0 : x = gel(x,1);
544 0 : return typ(v) == t_POL? RgX_Rg_mul(v,x): RgV_Rg_mul(v,x);
545 : }
546 1665 : x = multable(M, x); /* multiplication table by x */
547 1665 : y = cgetg_copy(v, &l);
548 1665 : if (typ(v) == t_POL)
549 : {
550 1665 : y[1] = v[1];
551 7484 : for (i=2; i < l; i++) gel(y,i) = mulbytab(x, gel(v,i));
552 1665 : y = normalizepol(y);
553 : }
554 : else
555 : {
556 0 : for (i=1; i < l; i++) gel(y,i) = mulbytab(x, gel(v,i));
557 : }
558 1665 : return y;
559 : }
560 :
561 : GEN
562 1115414 : zkmultable_capZ(GEN mx) { return Q_denom(zkmultable_inv(mx)); }
563 : GEN
564 1378685 : zkmultable_inv(GEN mx) { return ZM_gauss(mx, col_ei(lg(mx)-1,1)); }
565 : /* nf a true nf, x a ZC */
566 : GEN
567 263271 : zk_inv(GEN nf, GEN x) { return zkmultable_inv(zk_multable(nf,x)); }
568 :
569 : /* inverse of x in nf */
570 : GEN
571 160548 : nfinv(GEN nf, GEN x)
572 : {
573 160548 : pari_sp av = avma;
574 : GEN z;
575 :
576 160548 : nf = checknf(nf);
577 160548 : if (is_famat(x)) return famat_inv(x);
578 160548 : x = nf_to_scalar_or_basis(nf, x);
579 160548 : if (typ(x) == t_COL)
580 : {
581 : GEN d;
582 147823 : x = Q_remove_denom(x, &d);
583 147823 : z = zk_inv(nf, x);
584 147823 : if (d) z = RgC_Rg_mul(z, d);
585 : }
586 : else
587 12725 : z = ginv(x);
588 160548 : return gc_upto(av, z);
589 : }
590 :
591 : /* quotient of x and y in nf */
592 : GEN
593 33268 : nfdiv(GEN nf, GEN x, GEN y)
594 : {
595 33268 : pari_sp av = avma;
596 : GEN z;
597 :
598 33268 : nf = checknf(nf);
599 33268 : if (is_famat(x) || is_famat(y)) return famat_div(x,y);
600 33190 : y = nf_to_scalar_or_basis(nf, y);
601 33190 : if (typ(y) != t_COL)
602 : {
603 16242 : x = nf_to_scalar_or_basis(nf, x);
604 16242 : z = (typ(x) == t_COL)? RgC_Rg_div(x, y): gdiv(x,y);
605 : }
606 : else
607 : {
608 : GEN d;
609 16948 : y = Q_remove_denom(y, &d);
610 16948 : z = nfmul(nf, x, zk_inv(nf,y));
611 16948 : if (d) z = typ(z) == t_COL? RgC_Rg_mul(z, d): gmul(z, d);
612 : }
613 33190 : return gc_upto(av, z);
614 : }
615 :
616 : /* product of INTEGERS (t_INT or ZC) x and y in (true) nf */
617 : GEN
618 3995992 : nfmuli(GEN nf, GEN x, GEN y)
619 : {
620 3995992 : if (typ(x) == t_INT) return (typ(y) == t_COL)? ZC_Z_mul(y, x): mulii(x,y);
621 2959149 : if (typ(y) == t_INT) return ZC_Z_mul(x, y);
622 2744755 : return nfmuli_ZC(nf, x, y);
623 : }
624 : GEN
625 3955858 : nfsqri(GEN nf, GEN x)
626 3955858 : { return (typ(x) == t_INT)? sqri(x): nfsqri_ZC(nf, x); }
627 :
628 : /* both x and y are RgV */
629 : GEN
630 0 : tablemul(GEN TAB, GEN x, GEN y)
631 : {
632 : long i, j, k, N;
633 : GEN s, v;
634 0 : if (typ(x) != t_COL) return gmul(x, y);
635 0 : if (typ(y) != t_COL) return gmul(y, x);
636 0 : N = lg(x)-1;
637 0 : v = cgetg(N+1,t_COL);
638 0 : for (k=1; k<=N; k++)
639 : {
640 0 : pari_sp av = avma;
641 0 : GEN TABi = TAB;
642 0 : if (k == 1)
643 0 : s = gmul(gel(x,1),gel(y,1));
644 : else
645 0 : s = gadd(gmul(gel(x,1),gel(y,k)),
646 0 : gmul(gel(x,k),gel(y,1)));
647 0 : for (i=2; i<=N; i++)
648 : {
649 0 : GEN t, xi = gel(x,i);
650 0 : TABi += N;
651 0 : if (gequal0(xi)) continue;
652 :
653 0 : t = NULL;
654 0 : for (j=2; j<=N; j++)
655 : {
656 0 : GEN p1, c = gcoeff(TABi, k, j); /* m^{i,j}_k */
657 0 : if (gequal0(c)) continue;
658 0 : p1 = gmul(c, gel(y,j));
659 0 : t = t? gadd(t, p1): p1;
660 : }
661 0 : if (t) s = gadd(s, gmul(xi, t));
662 : }
663 0 : gel(v,k) = gc_upto(av,s);
664 : }
665 0 : return v;
666 : }
667 : GEN
668 8239 : tablesqr(GEN TAB, GEN x)
669 : {
670 : long i, j, k, N;
671 : GEN s, v;
672 :
673 8239 : if (typ(x) != t_COL) return gsqr(x);
674 8239 : N = lg(x)-1;
675 8239 : v = cgetg(N+1,t_COL);
676 :
677 66423 : for (k=1; k<=N; k++)
678 : {
679 58184 : pari_sp av = avma;
680 58184 : GEN TABi = TAB;
681 58184 : if (k == 1)
682 8239 : s = gsqr(gel(x,1));
683 : else
684 49945 : s = gmul2n(gmul(gel(x,1),gel(x,k)), 1);
685 448504 : for (i=2; i<=N; i++)
686 : {
687 390320 : GEN p1, c, t, xi = gel(x,i);
688 390320 : TABi += N;
689 390320 : if (gequal0(xi)) continue;
690 :
691 110558 : c = gcoeff(TABi, k, i);
692 110558 : t = !gequal0(c)? gmul(c,xi): NULL;
693 515286 : for (j=i+1; j<=N; j++)
694 : {
695 404728 : c = gcoeff(TABi, k, j);
696 404728 : if (gequal0(c)) continue;
697 195184 : p1 = gmul(gmul2n(c,1), gel(x,j));
698 195184 : t = t? gadd(t, p1): p1;
699 : }
700 110558 : if (t) s = gadd(s, gmul(xi, t));
701 : }
702 58184 : gel(v,k) = gc_upto(av,s);
703 : }
704 8239 : return v;
705 : }
706 :
707 : static GEN
708 339137 : _mul(void *data, GEN x, GEN y) { return nfmuli((GEN)data,x,y); }
709 : static GEN
710 898534 : _sqr(void *data, GEN x) { return nfsqri((GEN)data,x); }
711 :
712 : /* Compute z^n in nf, left-shift binary powering */
713 : GEN
714 865575 : nfpow(GEN nf, GEN z, GEN n)
715 : {
716 865575 : pari_sp av = avma;
717 : long s;
718 : GEN x, cx;
719 :
720 865575 : if (typ(n)!=t_INT) pari_err_TYPE("nfpow",n);
721 865575 : nf = checknf(nf);
722 865575 : s = signe(n); if (!s) return gen_1;
723 865575 : if (is_famat(z)) return famat_pow(z, n);
724 813596 : x = nf_to_scalar_or_basis(nf, z);
725 813596 : if (typ(x) != t_COL) return powgi(x,n);
726 705611 : if (s < 0)
727 : { /* simplified nfinv */
728 : GEN d;
729 39482 : x = Q_remove_denom(x, &d);
730 39482 : x = zk_inv(nf, x);
731 39482 : x = primitive_part(x, &cx);
732 39482 : cx = mul_content(cx, d);
733 39482 : n = negi(n);
734 : }
735 : else
736 666129 : x = primitive_part(x, &cx);
737 705611 : x = gen_pow_i(x, n, (void*)nf, _sqr, _mul);
738 705611 : if (cx)
739 40844 : x = gc_upto(av, gmul(x, powgi(cx, n)));
740 : else
741 664767 : x = gc_GEN(av, x);
742 705611 : return x;
743 : }
744 : /* Compute z^n in nf, left-shift binary powering */
745 : GEN
746 317616 : nfpow_u(GEN nf, GEN z, ulong n)
747 : {
748 317616 : pari_sp av = avma;
749 : GEN x, cx;
750 :
751 317616 : if (!n) return gen_1;
752 317616 : x = nf_to_scalar_or_basis(nf, z);
753 317616 : if (typ(x) != t_COL) return gpowgs(x,n);
754 282707 : x = primitive_part(x, &cx);
755 282707 : x = gen_powu_i(x, n, (void*)nf, _sqr, _mul);
756 282707 : if (cx)
757 : {
758 97529 : x = gmul(x, powgi(cx, utoipos(n)));
759 97529 : return gc_upto(av,x);
760 : }
761 185178 : return gc_GEN(av, x);
762 : }
763 :
764 : long
765 1044 : nfissquare(GEN nf, GEN z, GEN *px)
766 : {
767 1044 : pari_sp av = avma;
768 1044 : long v = fetch_var_higher();
769 : GEN R;
770 1044 : nf = checknf(nf);
771 1044 : if (nf_get_degree(nf) == 1)
772 : {
773 180 : z = algtobasis(nf, z);
774 180 : if (!issquareall(gel(z,1), px)) return gc_long(av, 0);
775 18 : if (px) *px = gc_upto(av, *px); else set_avma(av);
776 18 : return 1;
777 : }
778 864 : z = nf_to_scalar_or_alg(nf, z);
779 864 : R = nfroots(nf, deg2pol_shallow(gen_m1, gen_0, z, v));
780 864 : delete_var(); if (lg(R) == 1) return gc_long(av, 0);
781 486 : if (px) *px = gc_GEN(av, nf_to_scalar_or_basis(nf, gel(R,1)));
782 12 : else set_avma(av);
783 486 : return 1;
784 : }
785 :
786 : long
787 10026 : nfispower(GEN nf, GEN z, long n, GEN *px)
788 : {
789 10026 : pari_sp av = avma;
790 10026 : long v = fetch_var_higher();
791 : GEN R;
792 10026 : nf = checknf(nf);
793 10026 : if (nf_get_degree(nf) == 1)
794 : {
795 282 : z = algtobasis(nf, z);
796 282 : if (!ispower(gel(z,1), stoi(n), px)) return gc_long(av, 0);
797 126 : if (px) *px = gc_upto(av, *px); else set_avma(av);
798 126 : return 1;
799 : }
800 9744 : if (n <= 0)
801 0 : pari_err_DOMAIN("nfeltispower","exponent","<=",gen_0,stoi(n));
802 9744 : z = nf_to_scalar_or_alg(nf, z);
803 9744 : if (n==1)
804 : {
805 0 : if (px) *px = gc_GEN(av, z);
806 0 : return 1;
807 : }
808 9744 : R = nfroots(nf, gsub(pol_xn(n, v), z));
809 9744 : delete_var(); if (lg(R) == 1) return gc_long(av, 0);
810 3239 : if (px) *px = gc_GEN(av, nf_to_scalar_or_basis(nf, gel(R,1)));
811 3227 : else set_avma(av);
812 3239 : return 1;
813 : }
814 :
815 : static GEN
816 48 : idmulred(void *nf, GEN x, GEN y) { return idealmulred((GEN) nf, x, y); }
817 : static GEN
818 352 : idpowred(void *nf, GEN x, GEN n) { return idealpowred((GEN) nf, x, n); }
819 : static GEN
820 61728 : idmul(void *nf, GEN x, GEN y) { return idealmul((GEN) nf, x, y); }
821 : static GEN
822 75400 : idpow(void *nf, GEN x, GEN n) { return idealpow((GEN) nf, x, n); }
823 : GEN
824 80990 : idealfactorback(GEN nf, GEN L, GEN e, long red)
825 : {
826 80990 : nf = checknf(nf);
827 80990 : if (red) return gen_factorback(L, e, (void*)nf, &idmulred, &idpowred, NULL);
828 80686 : if (!e && typ(L) == t_MAT && lg(L) == 3) { e = gel(L,2); L = gel(L,1); }
829 80686 : if (is_vec_t(typ(L)) && RgV_is_prV(L))
830 : { /* don't use gen_factorback since *= pr^v can be done more efficiently */
831 63000 : pari_sp av = avma;
832 63000 : long i, l = lg(L);
833 : GEN a;
834 63000 : if (!e) e = const_vec(l-1, gen_1);
835 60546 : else switch(typ(e))
836 : {
837 6591 : case t_VECSMALL: e = zv_to_ZV(e); break;
838 53955 : case t_VEC: case t_COL:
839 53955 : if (!RgV_is_ZV(e))
840 0 : pari_err_TYPE("factorback [not an exponent vector]", e);
841 53955 : break;
842 0 : default: pari_err_TYPE("idealfactorback", e);
843 : }
844 63000 : if (l != lg(e))
845 0 : pari_err_TYPE("factorback [not an exponent vector]", e);
846 63000 : if (l == 1 || ZV_equal0(e)) return gc_const(av, gen_1);
847 19980 : a = idealpow(nf, gel(L,1), gel(e,1));
848 214214 : for (i = 2; i < l; i++)
849 194234 : if (signe(gel(e,i))) a = idealmulpowprime(nf, a, gel(L,i), gel(e,i));
850 19980 : return gc_upto(av, a);
851 : }
852 17686 : return gen_factorback(L, e, (void*)nf, &idmul, &idpow, NULL);
853 : }
854 : static GEN
855 295810 : eltmul(void *nf, GEN x, GEN y) { return nfmul((GEN) nf, x, y); }
856 : static GEN
857 423349 : eltpow(void *nf, GEN x, GEN n) { return nfpow((GEN) nf, x, n); }
858 : GEN
859 239199 : nffactorback(GEN nf, GEN L, GEN e)
860 239199 : { return gen_factorback(L, e, (void*)checknf(nf), &eltmul, &eltpow, NULL); }
861 :
862 : static GEN
863 624123 : _nf_red(void *E, GEN x) { (void)E; return gcopy(x); }
864 :
865 : static GEN
866 3118292 : _nf_add(void *E, GEN x, GEN y) { return nfadd((GEN)E,x,y); }
867 :
868 : static GEN
869 164302 : _nf_neg(void *E, GEN x) { (void)E; return gneg(x); }
870 :
871 : static GEN
872 3632116 : _nf_mul(void *E, GEN x, GEN y) { return nfmul((GEN)E,x,y); }
873 :
874 : static GEN
875 10991 : _nf_inv(void *E, GEN x) { return nfinv((GEN)E,x); }
876 :
877 : static GEN
878 2699 : _nf_s(void *E, long x) { (void)E; return stoi(x); }
879 :
880 : static const struct bb_field nf_field={_nf_red,_nf_add,_nf_mul,_nf_neg,
881 : _nf_inv,&gequal0,_nf_s };
882 :
883 43894 : const struct bb_field *get_nf_field(void **E, GEN nf)
884 43894 : { *E = (void*)nf; return &nf_field; }
885 :
886 : GEN
887 10 : nfM_det(GEN nf, GEN M)
888 : {
889 : void *E;
890 10 : const struct bb_field *S = get_nf_field(&E, nf);
891 10 : return gen_det(M, E, S);
892 : }
893 : GEN
894 2689 : nfM_inv(GEN nf, GEN M)
895 : {
896 : void *E;
897 2689 : const struct bb_field *S = get_nf_field(&E, nf);
898 2689 : return gen_Gauss(M, matid(lg(M)-1), E, S);
899 : }
900 :
901 : GEN
902 0 : nfM_ker(GEN nf, GEN M)
903 : {
904 : void *E;
905 0 : const struct bb_field *S = get_nf_field(&E, nf);
906 0 : return gen_ker(M, 0, E, S);
907 : }
908 :
909 : GEN
910 2368 : nfM_mul(GEN nf, GEN A, GEN B)
911 : {
912 : void *E;
913 2368 : const struct bb_field *S = get_nf_field(&E, nf);
914 2368 : return gen_matmul(A, B, E, S);
915 : }
916 : GEN
917 38827 : nfM_nfC_mul(GEN nf, GEN A, GEN B)
918 : {
919 : void *E;
920 38827 : const struct bb_field *S = get_nf_field(&E, nf);
921 38827 : return gen_matcolmul(A, B, E, S);
922 : }
923 :
924 : /* valuation of integral x (ZV), with resp. to prime ideal pr */
925 : long
926 20840899 : ZC_nfvalrem(GEN x, GEN pr, GEN *newx)
927 : {
928 20840899 : pari_sp av = avma;
929 : long i, v, l;
930 20840899 : GEN r, y, p = pr_get_p(pr), mul = pr_get_tau(pr);
931 :
932 : /* p inert */
933 20840899 : if (typ(mul) == t_INT) return newx? ZV_pvalrem(x, p, newx):ZV_pval(x, p);
934 19986564 : y = cgetg_copy(x, &l); /* will hold the new x */
935 19986564 : x = leafcopy(x);
936 32403444 : for(v=0;; v++)
937 : {
938 122964516 : for (i=1; i<l; i++)
939 : { /* is (x.b)[i] divisible by p ? */
940 110547636 : gel(y,i) = dvmdii(ZMrow_ZC_mul(mul,x,i),p,&r);
941 110547636 : if (r != gen_0) { if (newx) *newx = x; return v; }
942 : }
943 12416880 : swap(x, y);
944 12416880 : if (!newx && (v & 0xf) == 0xf) v += pr_get_e(pr) * ZV_pvalrem(x, p, &x);
945 12416880 : if (gc_needed(av,1))
946 : {
947 0 : if(DEBUGMEM>1) pari_warn(warnmem,"ZC_nfvalrem, v >= %ld", v);
948 0 : (void)gc_all(av, 2, &x, &y);
949 : }
950 : }
951 : }
952 : long
953 17075614 : ZC_nfval(GEN x, GEN P)
954 17075614 : { return ZC_nfvalrem(x, P, NULL); }
955 :
956 : /* v_P(x) != 0, x a ZV. Simpler version of ZC_nfvalrem */
957 : int
958 1088177 : ZC_prdvd(GEN x, GEN P)
959 : {
960 1088177 : pari_sp av = avma;
961 : long i, l;
962 1088177 : GEN p = pr_get_p(P), mul = pr_get_tau(P);
963 1088177 : if (typ(mul) == t_INT) return ZV_Z_dvd(x, p);
964 1087691 : l = lg(x);
965 4374168 : for (i=1; i<l; i++)
966 3917434 : if (!dvdii(ZMrow_ZC_mul(mul,x,i), p)) return gc_bool(av,0);
967 456734 : return gc_bool(av,1);
968 : }
969 :
970 : int
971 306 : pr_equal(GEN P, GEN Q)
972 : {
973 306 : GEN gQ, p = pr_get_p(P);
974 306 : long e = pr_get_e(P), f = pr_get_f(P), n;
975 306 : if (!equalii(p, pr_get_p(Q)) || e != pr_get_e(Q) || f != pr_get_f(Q))
976 288 : return 0;
977 18 : gQ = pr_get_gen(Q); n = lg(gQ)-1;
978 18 : if (2*e*f > n) return 1; /* room for only one such pr */
979 12 : return ZV_equal(pr_get_gen(P), gQ) || ZC_prdvd(gQ, P);
980 : }
981 :
982 : GEN
983 362526 : famat_nfvalrem(GEN nf, GEN x, GEN pr, GEN *py)
984 : {
985 362526 : pari_sp av = avma;
986 362526 : GEN P = gel(x,1), E = gel(x,2), V = gen_0, y = NULL;
987 362526 : long l = lg(P), simplify = 0, i;
988 362526 : if (py) { *py = gen_1; y = cgetg(l, t_COL); }
989 :
990 1941468 : for (i = 1; i < l; i++)
991 : {
992 1578942 : GEN e = gel(E,i);
993 : long v;
994 1578942 : if (!signe(e))
995 : {
996 6 : if (py) gel(y,i) = gen_1;
997 6 : simplify = 1; continue;
998 : }
999 1578936 : v = nfvalrem(nf, gel(P,i), pr, py? &gel(y,i): NULL);
1000 1578936 : if (v == LONG_MAX) { set_avma(av); if (py) *py = gen_0; return mkoo(); }
1001 1578936 : V = addmulii(V, stoi(v), e);
1002 : }
1003 362526 : if (!py) V = gc_INT(av, V);
1004 : else
1005 : {
1006 48 : y = mkmat2(y, gel(x,2));
1007 48 : if (simplify) y = famat_remove_trivial(y);
1008 48 : (void)gc_all(av, 2, &V, &y); *py = y;
1009 : }
1010 362526 : return V;
1011 : }
1012 : long
1013 4807006 : nfval(GEN nf, GEN x, GEN pr)
1014 : {
1015 4807006 : pari_sp av = avma;
1016 : long w, e;
1017 : GEN cx, p;
1018 :
1019 4807006 : if (gequal0(x)) return LONG_MAX;
1020 4796068 : nf = checknf(nf);
1021 4796068 : checkprid(pr);
1022 4796062 : p = pr_get_p(pr);
1023 4796062 : e = pr_get_e(pr);
1024 4796062 : x = nf_to_scalar_or_basis(nf, x);
1025 4796062 : if (typ(x) != t_COL) return e*Q_pval(x,p);
1026 2033358 : x = Q_primitive_part(x, &cx);
1027 2033358 : w = ZC_nfval(x,pr);
1028 2033358 : if (cx) w += e*Q_pval(cx,p);
1029 2033358 : return gc_long(av,w);
1030 : }
1031 :
1032 : /* want to write p^v = uniformizer^(e*v) * z^v, z coprime to pr */
1033 : /* z := tau^e / p^(e-1), algebraic integer coprime to pr; return z^v */
1034 : static GEN
1035 834354 : powp(GEN nf, GEN pr, long v)
1036 : {
1037 : GEN b, z;
1038 : long e;
1039 834354 : if (!v) return gen_1;
1040 382974 : b = pr_get_tau(pr);
1041 382974 : if (typ(b) == t_INT) return gen_1;
1042 112542 : e = pr_get_e(pr);
1043 112542 : z = gel(b,1);
1044 112542 : if (e != 1) z = gdiv(nfpow_u(nf, z, e), powiu(pr_get_p(pr),e-1));
1045 112542 : if (v < 0) { v = -v; z = nfinv(nf, z); }
1046 112542 : if (v != 1) z = nfpow_u(nf, z, v);
1047 112542 : return z;
1048 : }
1049 : long
1050 3142590 : nfvalrem(GEN nf, GEN x, GEN pr, GEN *py)
1051 : {
1052 3142590 : pari_sp av = avma;
1053 : long w, e;
1054 : GEN cx, p, t;
1055 :
1056 3142590 : if (!py) return nfval(nf,x,pr);
1057 1552200 : if (gequal0(x)) { *py = gen_0; return LONG_MAX; }
1058 1552152 : nf = checknf(nf);
1059 1552152 : checkprid(pr);
1060 1552152 : p = pr_get_p(pr);
1061 1552152 : e = pr_get_e(pr);
1062 1552152 : x = nf_to_scalar_or_basis(nf, x);
1063 1552152 : if (typ(x) != t_COL) {
1064 478146 : w = Q_pvalrem(x,p, py);
1065 478146 : if (!w) { *py = gc_GEN(av, x); return 0; }
1066 299364 : *py = gc_upto(av, gmul(powp(nf, pr, w), *py));
1067 299364 : return e*w;
1068 : }
1069 1074006 : x = Q_primitive_part(x, &cx);
1070 1074006 : w = ZC_nfvalrem(x,pr, py);
1071 1074006 : if (cx)
1072 : {
1073 534990 : long v = Q_pvalrem(cx,p, &t);
1074 534990 : *py = nfmul(nf, *py, gmul(powp(nf,pr,v), t));
1075 534990 : *py = gc_upto(av, *py);
1076 534990 : w += e*v;
1077 : }
1078 : else
1079 539016 : *py = gc_GEN(av, *py);
1080 1074006 : return w;
1081 : }
1082 : GEN
1083 12870 : gpnfvalrem(GEN nf, GEN x, GEN pr, GEN *py)
1084 : {
1085 : long v;
1086 12870 : if (is_famat(x)) return famat_nfvalrem(nf, x, pr, py);
1087 12864 : v = nfvalrem(nf,x,pr,py);
1088 12864 : return v == LONG_MAX? mkoo(): stoi(v);
1089 : }
1090 :
1091 : GEN
1092 193339 : basistoalg(GEN nf, GEN x)
1093 : {
1094 : GEN T;
1095 :
1096 193339 : nf = checknf(nf);
1097 193339 : switch(typ(x))
1098 : {
1099 122155 : case t_COL: {
1100 122155 : pari_sp av = avma; x = nf_to_scalar_or_alg(nf, x);
1101 122149 : return gc_GEN(av, mkpolmod(x, nf_get_pol(nf)));
1102 : }
1103 39054 : case t_POLMOD:
1104 39054 : T = nf_get_pol(nf);
1105 39054 : if (!RgX_equal_var(T,gel(x,1)))
1106 0 : pari_err_MODULUS("basistoalg", T,gel(x,1));
1107 39054 : return gcopy(x);
1108 4170 : case t_POL:
1109 4170 : T = nf_get_pol(nf);
1110 4170 : if (varn(T) != varn(x)) pari_err_VAR("basistoalg",x,T);
1111 4164 : retmkpolmod(RgX_rem(x, T), ZX_copy(T));
1112 27960 : case t_INT:
1113 : case t_FRAC:
1114 27960 : T = nf_get_pol(nf);
1115 27960 : retmkpolmod(gcopy(x), ZX_copy(T));
1116 0 : default:
1117 0 : pari_err_TYPE("basistoalg",x);
1118 : return NULL; /* LCOV_EXCL_LINE */
1119 : }
1120 : }
1121 :
1122 : /* true nf, x a t_POL */
1123 : static GEN
1124 2960709 : pol_to_scalar_or_basis(GEN nf, GEN x)
1125 : {
1126 2960709 : GEN T = nf_get_pol(nf);
1127 2960709 : long l = lg(x);
1128 2960709 : if (varn(x) != varn(T)) pari_err_VAR("nf_to_scalar_or_basis", x,T);
1129 2960632 : if (l >= lg(T)) { x = RgX_rem(x, T); l = lg(x); }
1130 2960632 : if (l == 2) return gen_0;
1131 2566556 : if (l == 3)
1132 : {
1133 577539 : x = gel(x,2);
1134 577539 : if (!is_rational_t(typ(x))) pari_err_TYPE("nf_to_scalar_or_basis",x);
1135 577533 : return x;
1136 : }
1137 1989017 : return poltobasis(nf,x);
1138 : }
1139 : /* Assume nf is a genuine nf. */
1140 : GEN
1141 104696619 : nf_to_scalar_or_basis(GEN nf, GEN x)
1142 : {
1143 104696619 : switch(typ(x))
1144 : {
1145 60175549 : case t_INT: case t_FRAC:
1146 60175549 : return x;
1147 447994 : case t_POLMOD:
1148 447994 : x = checknfelt_mod(nf,x,"nf_to_scalar_or_basis");
1149 447904 : switch(typ(x))
1150 : {
1151 30973 : case t_INT: case t_FRAC: return x;
1152 416931 : case t_POL: return pol_to_scalar_or_basis(nf,x);
1153 : }
1154 0 : break;
1155 2543778 : case t_POL: return pol_to_scalar_or_basis(nf,x);
1156 41529298 : case t_COL:
1157 41529298 : if (lg(x)-1 != nf_get_degree(nf)) break;
1158 41529218 : return QV_isscalar(x)? gel(x,1): x;
1159 : }
1160 80 : pari_err_TYPE("nf_to_scalar_or_basis",x);
1161 : return NULL; /* LCOV_EXCL_LINE */
1162 : }
1163 : /* Let x be a polynomial with coefficients in Q or nf. Return the same
1164 : * polynomial with coefficients expressed as vectors (on the integral basis).
1165 : * No consistency checks, not memory-clean. */
1166 : GEN
1167 27807 : RgX_to_nfX(GEN nf, GEN x)
1168 213788 : { pari_APPLY_pol_normalized(nf_to_scalar_or_basis(nf, gel(x,i))); }
1169 :
1170 : /* Assume nf is a genuine nf. */
1171 : GEN
1172 6034352 : nf_to_scalar_or_alg(GEN nf, GEN x)
1173 : {
1174 6034352 : switch(typ(x))
1175 : {
1176 1645262 : case t_INT: case t_FRAC:
1177 1645262 : return x;
1178 80352 : case t_POLMOD:
1179 80352 : x = checknfelt_mod(nf,x,"nf_to_scalar_or_alg");
1180 80352 : if (typ(x) != t_POL) return x;
1181 : /* fall through */
1182 : case t_POL:
1183 : {
1184 85987 : GEN T = nf_get_pol(nf);
1185 85987 : long l = lg(x);
1186 85987 : if (varn(x) != varn(T)) pari_err_VAR("nf_to_scalar_or_alg", x,T);
1187 85987 : if (l >= lg(T)) { x = RgX_rem(x, T); l = lg(x); }
1188 85987 : if (l == 2) return gen_0;
1189 85927 : if (l == 3) return gel(x,2);
1190 84459 : return x;
1191 : }
1192 4302979 : case t_COL:
1193 : {
1194 : GEN dx;
1195 4302979 : if (lg(x)-1 != nf_get_degree(nf)) break;
1196 8518797 : if (QV_isscalar(x)) return gel(x,1);
1197 4215824 : x = Q_remove_denom(x, &dx);
1198 4215824 : x = RgV_RgC_mul(nf_get_zkprimpart(nf), x);
1199 4215824 : dx = mul_denom(dx, nf_get_zkden(nf));
1200 4215824 : return gdiv(x,dx);
1201 : }
1202 : }
1203 46 : pari_err_TYPE("nf_to_scalar_or_alg",x);
1204 : return NULL; /* LCOV_EXCL_LINE */
1205 : }
1206 :
1207 : /* Assume nf is a genuine nf. */
1208 : GEN
1209 1828113 : nf_to_scalar_or_polmod(GEN nf, GEN x)
1210 : {
1211 1828113 : x = nf_to_scalar_or_alg(nf, x);
1212 1828113 : if (typ(x) == t_POL && varn(x) == nf_get_varn(nf))
1213 240144 : x = mkpolmod(x, nf_get_pol(nf));
1214 1828113 : return x;
1215 : }
1216 :
1217 : /* gmul(A, RgX_to_RgC(x)), A t_MAT of compatible dimensions */
1218 : GEN
1219 975 : RgM_RgX_mul(GEN A, GEN x)
1220 : {
1221 975 : long i, l = lg(x)-1;
1222 : GEN z;
1223 975 : if (l == 1) return zerocol(nbrows(A));
1224 965 : z = gmul(gel(x,2), gel(A,1));
1225 1825 : for (i = 2; i < l; i++)
1226 860 : if (!gequal0(gel(x,i+1))) z = gadd(z, gmul(gel(x,i+1), gel(A,i)));
1227 965 : return z;
1228 : }
1229 : GEN
1230 8696844 : ZM_ZX_mul(GEN A, GEN x)
1231 : {
1232 8696844 : long i, l = lg(x)-1;
1233 : GEN z;
1234 8696844 : if (l == 1) return zerocol(nbrows(A));
1235 8695738 : z = ZC_Z_mul(gel(A,1), gel(x,2));
1236 27325337 : for (i = 2; i < l ; i++)
1237 18629599 : if (signe(gel(x,i+1))) z = ZC_add(z, ZC_Z_mul(gel(A,i), gel(x,i+1)));
1238 8695738 : return z;
1239 : }
1240 : /* x a t_POL, nf a genuine nf. No garbage collecting. No check. */
1241 : GEN
1242 8181266 : poltobasis(GEN nf, GEN x)
1243 : {
1244 8181266 : GEN d, T = nf_get_pol(nf);
1245 8181266 : if (varn(x) != varn(T)) pari_err_VAR( "poltobasis", x,T);
1246 8181152 : if (degpol(x) >= degpol(T)) x = RgX_rem(x,T);
1247 8181152 : x = Q_remove_denom(x, &d);
1248 8181152 : if (!RgX_is_ZX(x)) pari_err_TYPE("poltobasis",x);
1249 8181127 : x = ZM_ZX_mul(nf_get_invzk(nf), x);
1250 8181127 : if (d) x = RgC_Rg_div(x, d);
1251 8181127 : return x;
1252 : }
1253 :
1254 : GEN
1255 831065 : algtobasis(GEN nf, GEN x)
1256 : {
1257 : pari_sp av;
1258 :
1259 831065 : nf = checknf(nf);
1260 831065 : switch(typ(x))
1261 : {
1262 131642 : case t_POLMOD:
1263 131642 : if (!RgX_equal_var(nf_get_pol(nf),gel(x,1)))
1264 6 : pari_err_MODULUS("algtobasis", nf_get_pol(nf),gel(x,1));
1265 131636 : x = gel(x,2);
1266 131636 : switch(typ(x))
1267 : {
1268 10770 : case t_INT:
1269 10770 : case t_FRAC: return scalarcol(x, nf_get_degree(nf));
1270 120866 : case t_POL:
1271 120866 : av = avma;
1272 120866 : return gc_upto(av,poltobasis(nf,x));
1273 : }
1274 0 : break;
1275 :
1276 215381 : case t_POL:
1277 215381 : av = avma;
1278 215381 : return gc_upto(av,poltobasis(nf,x));
1279 :
1280 71919 : case t_COL:
1281 71919 : if (!RgV_is_QV(x)) pari_err_TYPE("nfalgtobasis",x);
1282 71913 : if (lg(x)-1 != nf_get_degree(nf)) pari_err_DIM("nfalgtobasis");
1283 71913 : return gcopy(x);
1284 :
1285 412123 : case t_INT:
1286 412123 : case t_FRAC: return scalarcol(x, nf_get_degree(nf));
1287 : }
1288 0 : pari_err_TYPE("algtobasis",x);
1289 : return NULL; /* LCOV_EXCL_LINE */
1290 : }
1291 :
1292 : GEN
1293 52251 : rnfbasistoalg(GEN rnf,GEN x)
1294 : {
1295 52251 : const char *f = "rnfbasistoalg";
1296 : long lx, i;
1297 52251 : pari_sp av = avma;
1298 : GEN z, nf, R, T;
1299 :
1300 52251 : checkrnf(rnf);
1301 52251 : nf = rnf_get_nf(rnf);
1302 52251 : T = nf_get_pol(nf);
1303 52251 : R = QXQX_to_mod_shallow(rnf_get_pol(rnf), T);
1304 52251 : switch(typ(x))
1305 : {
1306 625 : case t_COL:
1307 625 : z = cgetg_copy(x, &lx);
1308 1855 : for (i=1; i<lx; i++)
1309 : {
1310 1270 : GEN c = nf_to_scalar_or_alg(nf, gel(x,i));
1311 1230 : if (typ(c) == t_POL) c = mkpolmod(c,T);
1312 1230 : gel(z,i) = c;
1313 : }
1314 585 : z = RgV_RgC_mul(gel(rnf_get_zk(rnf),1), z);
1315 525 : return gc_upto(av, gmodulo(z,R));
1316 :
1317 32116 : case t_POLMOD:
1318 32116 : x = polmod_nffix(f, rnf, x, 0);
1319 31921 : if (typ(x) != t_POL) break;
1320 15030 : retmkpolmod(RgX_copy(x), RgX_copy(R));
1321 1524 : case t_POL:
1322 1524 : if (varn(x) == varn(T)) { RgX_check_QX(x,f); x = gmodulo(x,T); break; }
1323 1335 : if (varn(x) == varn(R))
1324 : {
1325 1295 : x = RgX_nffix(f,nf_get_pol(nf),x,0);
1326 1295 : return gmodulo(x, R);
1327 : }
1328 40 : pari_err_VAR(f, x,R);
1329 : }
1330 35026 : retmkpolmod(scalarpol(x, varn(R)), RgX_copy(R));
1331 : }
1332 :
1333 : GEN
1334 2715 : matbasistoalg(GEN nf,GEN x)
1335 : {
1336 : long i, j, li, lx;
1337 2715 : GEN z = cgetg_copy(x, &lx);
1338 :
1339 2715 : if (lx == 1) return z;
1340 2710 : switch(typ(x))
1341 : {
1342 78 : case t_VEC: case t_COL:
1343 318 : for (i=1; i<lx; i++) gel(z,i) = basistoalg(nf, gel(x,i));
1344 78 : return z;
1345 2632 : case t_MAT: break;
1346 0 : default: pari_err_TYPE("matbasistoalg",x);
1347 : }
1348 2632 : li = lgcols(x);
1349 9271 : for (j=1; j<lx; j++)
1350 : {
1351 6639 : GEN c = cgetg(li,t_COL), xj = gel(x,j);
1352 6639 : gel(z,j) = c;
1353 28512 : for (i=1; i<li; i++) gel(c,i) = basistoalg(nf, gel(xj,i));
1354 : }
1355 2632 : return z;
1356 : }
1357 :
1358 : GEN
1359 28316 : matalgtobasis(GEN nf,GEN x)
1360 : {
1361 : long i, j, li, lx;
1362 28316 : GEN z = cgetg_copy(x, &lx);
1363 :
1364 28316 : if (lx == 1) return z;
1365 27919 : switch(typ(x))
1366 : {
1367 27913 : case t_VEC: case t_COL:
1368 73408 : for (i=1; i<lx; i++) gel(z,i) = algtobasis(nf, gel(x,i));
1369 27913 : return z;
1370 6 : case t_MAT: break;
1371 0 : default: pari_err_TYPE("matalgtobasis",x);
1372 : }
1373 6 : li = lgcols(x);
1374 12 : for (j=1; j<lx; j++)
1375 : {
1376 6 : GEN c = cgetg(li,t_COL), xj = gel(x,j);
1377 6 : gel(z,j) = c;
1378 18 : for (i=1; i<li; i++) gel(c,i) = algtobasis(nf, gel(xj,i));
1379 : }
1380 6 : return z;
1381 : }
1382 : GEN
1383 5469 : RgM_to_nfM(GEN nf,GEN x)
1384 : {
1385 : long i, j, li, lx;
1386 5469 : GEN z = cgetg_copy(x, &lx);
1387 :
1388 5469 : if (lx == 1) return z;
1389 5469 : li = lgcols(x);
1390 34842 : for (j=1; j<lx; j++)
1391 : {
1392 29373 : GEN c = cgetg(li,t_COL), xj = gel(x,j);
1393 29373 : gel(z,j) = c;
1394 180093 : for (i=1; i<li; i++) gel(c,i) = nf_to_scalar_or_basis(nf, gel(xj,i));
1395 : }
1396 5469 : return z;
1397 : }
1398 : GEN
1399 92548 : RgC_to_nfC(GEN nf, GEN x)
1400 532820 : { pari_APPLY_type(t_COL, nf_to_scalar_or_basis(nf, gel(x,i))) }
1401 :
1402 : /* x a t_POLMOD, supposedly in rnf = K[z]/(T), K = Q[y]/(Tnf) */
1403 : GEN
1404 155126 : polmod_nffix(const char *f, GEN rnf, GEN x, int lift)
1405 155126 : { return polmod_nffix2(f, rnf_get_nfpol(rnf), rnf_get_pol(rnf), x,lift); }
1406 : GEN
1407 155191 : polmod_nffix2(const char *f, GEN T, GEN R, GEN x, int lift)
1408 : {
1409 155191 : if (RgX_equal_var(gel(x,1), R))
1410 : {
1411 127876 : x = gel(x,2);
1412 127876 : if (typ(x) == t_POL && varn(x) == varn(R))
1413 : {
1414 99262 : x = RgX_nffix(f, T, x, lift);
1415 99262 : switch(lg(x))
1416 : {
1417 4986 : case 2: return gen_0;
1418 16070 : case 3: return gel(x,2);
1419 : }
1420 78206 : return x;
1421 : }
1422 : }
1423 55929 : return Rg_nffix(f, T, x, lift);
1424 : }
1425 : GEN
1426 1020 : rnfalgtobasis(GEN rnf,GEN x)
1427 : {
1428 1020 : const char *f = "rnfalgtobasis";
1429 1020 : pari_sp av = avma;
1430 : GEN T, R;
1431 :
1432 1020 : checkrnf(rnf);
1433 1020 : R = rnf_get_pol(rnf);
1434 1020 : T = rnf_get_nfpol(rnf);
1435 1020 : switch(typ(x))
1436 : {
1437 70 : case t_COL:
1438 70 : if (lg(x)-1 != rnf_get_degree(rnf)) pari_err_DIM(f);
1439 35 : x = RgV_nffix(f, T, x, 0);
1440 30 : return gc_GEN(av, x);
1441 :
1442 830 : case t_POLMOD:
1443 830 : x = polmod_nffix(f, rnf, x, 0);
1444 755 : if (typ(x) != t_POL) break;
1445 510 : return gc_upto(av, RgM_RgX_mul(rnf_get_invzk(rnf), x));
1446 80 : case t_POL:
1447 80 : if (varn(x) == varn(T))
1448 : {
1449 30 : RgX_check_QX(x,f);
1450 20 : if (degpol(x) >= degpol(T)) x = RgX_rem(x,T);
1451 20 : x = mkpolmod(x,T); break;
1452 : }
1453 50 : x = RgX_nffix(f, T, x, 0);
1454 40 : if (degpol(x) >= degpol(R)) x = RgX_rem(x, R);
1455 40 : return gc_upto(av, RgM_RgX_mul(rnf_get_invzk(rnf), x));
1456 : }
1457 305 : return gc_upto(av, scalarcol(x, rnf_get_degree(rnf)));
1458 : }
1459 :
1460 : /* Given a and b in nf, gives an algebraic integer y in nf such that a-b.y
1461 : * is "small" */
1462 : GEN
1463 222 : nfdiveuc(GEN nf, GEN a, GEN b)
1464 : {
1465 222 : pari_sp av = avma;
1466 222 : a = nfdiv(nf,a,b);
1467 222 : return gc_upto(av, ground(a));
1468 : }
1469 :
1470 : /* Given a and b in nf, gives a "small" algebraic integer r in nf
1471 : * of the form a-b.y */
1472 : GEN
1473 222 : nfmod(GEN nf, GEN a, GEN b)
1474 : {
1475 222 : pari_sp av = avma;
1476 222 : GEN p1 = gneg_i(nfmul(nf,b,ground(nfdiv(nf,a,b))));
1477 222 : return gc_upto(av, nfadd(nf,a,p1));
1478 : }
1479 :
1480 : /* Given a and b in nf, gives a two-component vector [y,r] in nf such
1481 : * that r=a-b.y is "small". */
1482 : GEN
1483 222 : nfdivrem(GEN nf, GEN a, GEN b)
1484 : {
1485 222 : pari_sp av = avma;
1486 222 : GEN p1,z, y = ground(nfdiv(nf,a,b));
1487 :
1488 222 : p1 = gneg_i(nfmul(nf,b,y));
1489 222 : z = cgetg(3,t_VEC);
1490 222 : gel(z,1) = gcopy(y);
1491 222 : gel(z,2) = nfadd(nf,a,p1); return gc_upto(av, z);
1492 : }
1493 :
1494 : /*************************************************************************/
1495 : /** **/
1496 : /** LOGARITHMIC EMBEDDINGS **/
1497 : /** **/
1498 : /*************************************************************************/
1499 :
1500 : static int
1501 4009615 : low_prec(GEN x)
1502 : {
1503 4009615 : switch(typ(x))
1504 : {
1505 0 : case t_INT: return !signe(x);
1506 4009615 : case t_REAL: return !signe(x) || realprec(x) <= DEFAULTPREC;
1507 0 : default: return 0;
1508 : }
1509 : }
1510 :
1511 : static GEN
1512 19700 : cxlog_1(GEN nf) { return zerocol(lg(nf_get_roots(nf))-1); }
1513 : static GEN
1514 456 : cxlog_m1(GEN nf, long prec)
1515 : {
1516 456 : long i, l = lg(nf_get_roots(nf)), r1 = nf_get_r1(nf);
1517 456 : GEN v = cgetg(l, t_COL), p, P;
1518 456 : p = mppi(prec); P = mkcomplex(gen_0, p);
1519 1058 : for (i = 1; i <= r1; i++) gel(v,i) = P; /* IPi*/
1520 456 : if (i < l) P = gmul2n(P,1);
1521 962 : for ( ; i < l; i++) gel(v,i) = P; /* 2IPi */
1522 456 : return v;
1523 : }
1524 : static GEN
1525 1494018 : ZC_cxlog(GEN nf, GEN x, long prec)
1526 : {
1527 : long i, l, r1;
1528 : GEN v;
1529 1494018 : x = RgM_RgC_mul(nf_get_M(nf), Q_primpart(x));
1530 1494018 : l = lg(x); r1 = nf_get_r1(nf);
1531 3769196 : for (i = 1; i <= r1; i++)
1532 2275178 : if (low_prec(gel(x,i))) return NULL;
1533 3045665 : for ( ; i < l; i++)
1534 1551647 : if (low_prec(gnorm(gel(x,i)))) return NULL;
1535 1494018 : v = cgetg(l,t_COL);
1536 3769196 : for (i = 1; i <= r1; i++) gel(v,i) = glog(gel(x,i),prec);
1537 3045665 : for ( ; i < l; i++) gel(v,i) = gmul2n(glog(gel(x,i),prec),1);
1538 1494018 : return v;
1539 : }
1540 : static GEN
1541 193109 : famat_cxlog(GEN nf, GEN fa, long prec)
1542 : {
1543 193109 : GEN G, E, y = NULL;
1544 : long i, l;
1545 :
1546 193109 : if (typ(fa) != t_MAT) pari_err_TYPE("famat_cxlog",fa);
1547 193109 : if (lg(fa) == 1) return cxlog_1(nf);
1548 193109 : G = gel(fa,1);
1549 193109 : E = gel(fa,2); l = lg(E);
1550 967031 : for (i = 1; i < l; i++)
1551 : {
1552 773922 : GEN t, e = gel(E,i), x = nf_to_scalar_or_basis(nf, gel(G,i));
1553 : /* multiplicative arch would be better (save logs), but exponents overflow
1554 : * [ could keep track of expo separately, but not worth it ] */
1555 773922 : switch(typ(x))
1556 : { /* ignore positive rationals */
1557 14033 : case t_FRAC: x = gel(x,1); /* fall through */
1558 230418 : case t_INT: if (signe(x) > 0) continue;
1559 72 : if (!mpodd(e)) continue;
1560 24 : t = cxlog_m1(nf, prec); /* we probably should not reach this line */
1561 24 : break;
1562 543504 : default: /* t_COL */
1563 543504 : t = ZC_cxlog(nf,x,prec); if (!t) return NULL;
1564 543504 : t = RgC_Rg_mul(t, e);
1565 : }
1566 543528 : y = y? RgV_add(y,t): t;
1567 : }
1568 193109 : return y ? y: cxlog_1(nf);
1569 : }
1570 : /* Archimedean components: [e_i Log( sigma_i(X) )], where X = primpart(x),
1571 : * and e_i = 1 (resp 2.) for i <= R1 (resp. > R1) */
1572 : GEN
1573 1144517 : nf_cxlog(GEN nf, GEN x, long prec)
1574 : {
1575 1144517 : if (typ(x) == t_MAT) return famat_cxlog(nf,x,prec);
1576 951408 : x = nf_to_scalar_or_basis(nf,x);
1577 951408 : switch(typ(x))
1578 : {
1579 0 : case t_FRAC: x = gel(x,1); /* fall through */
1580 894 : case t_INT:
1581 894 : return signe(x) > 0? cxlog_1(nf): cxlog_m1(nf, prec);
1582 950514 : default:
1583 950514 : return ZC_cxlog(nf, x, prec);
1584 : }
1585 : }
1586 : GEN
1587 73 : nfV_cxlog(GEN nf, GEN x, long prec)
1588 : {
1589 : long i, l;
1590 73 : GEN v = cgetg_copy(x, &l);
1591 123 : for (i = 1; i < l; i++)
1592 50 : if (!(gel(v,i) = nf_cxlog(nf, gel(x,i), prec))) return NULL;
1593 73 : return v;
1594 : }
1595 :
1596 : static GEN
1597 13384 : scalar_logembed(GEN nf, GEN u, GEN *emb)
1598 : {
1599 : GEN v, logu;
1600 13384 : long i, s = signe(u), RU = lg(nf_get_roots(nf))-1, R1 = nf_get_r1(nf);
1601 :
1602 13384 : if (!s) pari_err_DOMAIN("nflogembed","argument","=",gen_0,u);
1603 13384 : v = cgetg(RU+1, t_COL); logu = logr_abs(u);
1604 15866 : for (i = 1; i <= R1; i++) gel(v,i) = logu;
1605 13384 : if (i <= RU)
1606 : {
1607 12228 : GEN logu2 = shiftr(logu,1);
1608 47716 : for ( ; i <= RU; i++) gel(v,i) = logu2;
1609 : }
1610 13384 : if (emb) *emb = const_col(RU, u);
1611 13384 : return v;
1612 : }
1613 :
1614 : static GEN
1615 954 : famat_logembed(GEN nf,GEN x,GEN *emb,long prec)
1616 : {
1617 954 : GEN A, M, T, a, t, g = gel(x,1), e = gel(x,2);
1618 954 : long i, l = lg(e);
1619 :
1620 954 : if (l == 1) return scalar_logembed(nf, real_1(prec), emb);
1621 954 : A = NULL; T = emb? cgetg(l, t_COL): NULL;
1622 954 : if (emb) *emb = M = mkmat2(T, e);
1623 52690 : for (i = 1; i < l; i++)
1624 : {
1625 51736 : a = nflogembed(nf, gel(g,i), &t, prec);
1626 51736 : if (!a) return NULL;
1627 51736 : a = RgC_Rg_mul(a, gel(e,i));
1628 51736 : A = A? RgC_add(A, a): a;
1629 51736 : if (emb) gel(T,i) = t;
1630 : }
1631 954 : return A;
1632 : }
1633 :
1634 : /* Get archimedean components: [e_i log( | sigma_i(x) | )], with e_i = 1
1635 : * (resp 2.) for i <= R1 (resp. > R1) and set emb to the embeddings of x.
1636 : * Return NULL if precision problem */
1637 : GEN
1638 91644 : nflogembed(GEN nf, GEN x, GEN *emb, long prec)
1639 : {
1640 : long i, l, r1;
1641 : GEN v, t;
1642 :
1643 91644 : if (typ(x) == t_MAT) return famat_logembed(nf,x,emb,prec);
1644 90690 : x = nf_to_scalar_or_basis(nf,x);
1645 90690 : if (typ(x) != t_COL) return scalar_logembed(nf, gtofp(x,prec), emb);
1646 77306 : x = RgM_RgC_mul(nf_get_M(nf), x);
1647 77306 : l = lg(x); r1 = nf_get_r1(nf); v = cgetg(l,t_COL);
1648 114588 : for (i = 1; i <= r1; i++)
1649 : {
1650 37282 : t = gabs(gel(x,i),prec); if (low_prec(t)) return NULL;
1651 37282 : gel(v,i) = glog(t,prec);
1652 : }
1653 222814 : for ( ; i < l; i++)
1654 : {
1655 145508 : t = gnorm(gel(x,i)); if (low_prec(t)) return NULL;
1656 145508 : gel(v,i) = glog(t,prec);
1657 : }
1658 77306 : if (emb) *emb = x;
1659 77306 : return v;
1660 : }
1661 :
1662 : /*************************************************************************/
1663 : /** **/
1664 : /** REAL EMBEDDINGS **/
1665 : /** **/
1666 : /*************************************************************************/
1667 : static GEN
1668 437868 : sarch_get_cyc(GEN sarch) { return gel(sarch,1); }
1669 : static GEN
1670 1503025 : sarch_get_archp(GEN sarch) { return gel(sarch,2); }
1671 : static GEN
1672 585323 : sarch_get_MI(GEN sarch) { return gel(sarch,3); }
1673 : static GEN
1674 585323 : sarch_get_lambda(GEN sarch) { return gel(sarch,4); }
1675 : static GEN
1676 585323 : sarch_get_F(GEN sarch) { return gel(sarch,5); }
1677 :
1678 : /* true nf, x non-zero algebraic integer; return number of positive real roots
1679 : * of char_x */
1680 : static long
1681 929123 : num_positive(GEN nf, GEN x)
1682 : {
1683 929123 : GEN T = nf_get_pol(nf), B, charx;
1684 929123 : long dnf, vnf, N, r1 = nf_get_r1(nf);
1685 929123 : x = nf_to_scalar_or_alg(nf, x);
1686 929123 : if (typ(x) != t_POL) return (signe(x) < 0)? 0: degpol(T);
1687 : /* x not a scalar */
1688 924524 : if (r1 == 1)
1689 : {
1690 26909 : long s = signe(ZX_resultant(T, Q_primpart(x)));
1691 26909 : return s > 0? 1: 0;
1692 : }
1693 897615 : charx = ZXQ_charpoly(x, T, 0);
1694 897615 : charx = ZX_radical(charx);
1695 897615 : N = degpol(T) / degpol(charx);
1696 : /* real places are unramified ? */
1697 897615 : if (N == 1 || ZX_sturm(charx) * N == r1)
1698 897092 : return ZX_sturmpart(charx, mkvec2(gen_0,mkoo())) * N;
1699 : /* painful case, multiply by random square until primitive */
1700 523 : dnf = nf_get_degree(nf);
1701 523 : vnf = varn(T);
1702 523 : B = int2n(10);
1703 : for(;;)
1704 0 : {
1705 523 : GEN y = RgXQ_sqr(random_FpX(dnf, vnf, B), T);
1706 523 : y = RgXQ_mul(x, y, T);
1707 523 : charx = ZXQ_charpoly(y, T, 0);
1708 523 : if (ZX_is_squarefree(charx))
1709 523 : return ZX_sturmpart(charx, mkvec2(gen_0,mkoo()));
1710 : }
1711 : }
1712 :
1713 : /* x a QC: return sigma_k(x) where 1 <= k <= r1+r2; correct but inefficient
1714 : * if x in Q. M = nf_get_M(nf) */
1715 : static GEN
1716 1630 : nfembed_i(GEN M, GEN x, long k)
1717 : {
1718 1630 : long i, l = lg(M);
1719 1630 : GEN z = gel(x,1);
1720 18014 : for (i = 2; i < l; i++) z = gadd(z, gmul(gcoeff(M,k,i), gel(x,i)));
1721 1630 : return z;
1722 : }
1723 : GEN
1724 0 : nfembed(GEN nf, GEN x, long k)
1725 : {
1726 0 : pari_sp av = avma;
1727 0 : nf = checknf(nf);
1728 0 : x = nf_to_scalar_or_basis(nf,x);
1729 0 : if (typ(x) != t_COL) return gc_GEN(av, x);
1730 0 : return gc_upto(av, nfembed_i(nf_get_M(nf),x,k));
1731 : }
1732 :
1733 : /* x a ZC */
1734 : static GEN
1735 83475 : zk_embed(GEN M, GEN x, long k)
1736 : {
1737 83475 : long i, l = lg(x);
1738 83475 : GEN z = gel(x,1); /* times M[k,1], which is 1 */
1739 206506 : for (i = 2; i < l; i++) z = mpadd(z, mpmul(gcoeff(M,k,i), gel(x,i)));
1740 83475 : return z;
1741 : }
1742 :
1743 : /* check that signs[i..#signs] == s; signs = NULL encodes "totally positive" */
1744 : static int
1745 28267 : oksigns(long l, GEN signs, long i, long s)
1746 : {
1747 28267 : if (!signs) return s == 0;
1748 34778 : for (; i < l; i++)
1749 26138 : if (signs[i] != s) return 0;
1750 8640 : return 1;
1751 : }
1752 :
1753 : /* true nf, x a ZC (primitive for efficiency) which is not a scalar */
1754 : static int
1755 84314 : nfchecksigns_i(GEN nf, GEN x, GEN signs, GEN archp)
1756 : {
1757 84314 : long i, np, npc, l = lg(archp), r1 = nf_get_r1(nf);
1758 : GEN sarch;
1759 :
1760 84314 : if (r1 == 0) return 1;
1761 83978 : np = num_positive(nf, x);
1762 83978 : if (np == 0) return oksigns(l, signs, 1, 1);
1763 70789 : if (np == r1) return oksigns(l, signs, 1, 0);
1764 55711 : sarch = nfarchstar(nf, NULL, identity_perm(r1));
1765 62548 : for (i = 1, npc = 0; i < l; i++)
1766 : {
1767 62332 : GEN xi = set_sign_mod_divisor(nf, vecsmall_ei(r1, archp[i]), gen_1, sarch);
1768 : long ni, s;
1769 62332 : xi = Q_primpart(xi);
1770 62332 : ni = num_positive(nf, nfmuli(nf,x,xi));
1771 62332 : s = ni < np? 0: 1;
1772 62332 : if (s != (signs? signs[i]: 0)) return 0;
1773 27818 : if (!s) npc++; /* found a positive root */
1774 27818 : if (npc == np)
1775 : { /* found all positive roots */
1776 20422 : if (!signs) return i == l-1;
1777 15564 : for (i++; i < l; i++)
1778 7607 : if (signs[i] != 1) return 0;
1779 7957 : return 1;
1780 : }
1781 7396 : if (i - npc == r1 - np)
1782 : { /* found all negative roots */
1783 559 : if (!signs) return 1;
1784 607 : for (i++; i < l; i++)
1785 66 : if (signs[i]) return 0;
1786 541 : return 1;
1787 : }
1788 : }
1789 216 : return 1;
1790 : }
1791 : static void
1792 1046 : pl_convert(GEN pl, GEN *psigns, GEN *parchp)
1793 : {
1794 1046 : long i, j, l = lg(pl);
1795 1046 : GEN signs = cgetg(l, t_VECSMALL);
1796 1046 : GEN archp = cgetg(l, t_VECSMALL);
1797 3366 : for (i = j = 1; i < l; i++)
1798 : {
1799 2320 : if (!pl[i]) continue;
1800 1652 : archp[j] = i;
1801 1652 : signs[j] = (pl[i] < 0)? 1: 0;
1802 1652 : j++;
1803 : }
1804 1046 : setlg(archp, j); *parchp = archp;
1805 1046 : setlg(signs, j); *psigns = signs;
1806 1046 : }
1807 : /* pl : requested signs for real embeddings, 0 = no sign constraint */
1808 : int
1809 12434 : nfchecksigns(GEN nf, GEN x, GEN pl)
1810 : {
1811 12434 : pari_sp av = avma;
1812 : GEN signs, archp;
1813 12434 : nf = checknf(nf);
1814 12434 : x = nf_to_scalar_or_basis(nf,x);
1815 12434 : if (typ(x) != t_COL)
1816 : {
1817 11388 : long i, l = lg(pl), s = gsigne(x);
1818 20856 : for (i = 1; i < l; i++)
1819 11442 : if (pl[i] && pl[i] != s) return gc_bool(av,0);
1820 9414 : return gc_bool(av,1);
1821 : }
1822 1046 : pl_convert(pl, &signs, &archp);
1823 1046 : return gc_bool(av, nfchecksigns_i(nf, x, signs, archp));
1824 : }
1825 :
1826 : /* signs = NULL: totally positive, else sign[i] = 0 (+) or 1 (-) */
1827 : static GEN
1828 585323 : get_C(GEN lambda, long l, GEN signs)
1829 : {
1830 : long i;
1831 : GEN C, mlambda;
1832 585323 : if (!signs) return const_vec(l-1, lambda);
1833 563981 : C = cgetg(l, t_COL); mlambda = gneg(lambda);
1834 2190039 : for (i = 1; i < l; i++) gel(C,i) = signs[i]? mlambda: lambda;
1835 563981 : return C;
1836 : }
1837 : /* signs = NULL: totally positive at archp.
1838 : * Assume that a t_COL x is not a scalar */
1839 : static GEN
1840 697024 : nfsetsigns(GEN nf, GEN signs, GEN x, GEN sarch)
1841 : {
1842 697024 : long i, l = lg(sarch_get_archp(sarch));
1843 697024 : GEN ex = NULL;
1844 : /* Is signature already correct ? */
1845 697024 : if (typ(x) != t_COL)
1846 : {
1847 613756 : long s = gsigne(x);
1848 613756 : if (!s) i = 1;
1849 613738 : else if (!signs)
1850 5634 : i = (s < 0)? 1: l;
1851 : else
1852 : {
1853 608104 : s = s < 0? 1: 0;
1854 1043985 : for (i = 1; i < l; i++)
1855 966038 : if (signs[i] != s) break;
1856 : }
1857 613756 : if (i < l) ex = const_col(l-1, x);
1858 : }
1859 : else
1860 : { /* inefficient if x scalar, wrong if x = 0 */
1861 83268 : pari_sp av = avma;
1862 83268 : GEN cex, M = nf_get_M(nf), archp = sarch_get_archp(sarch);
1863 83268 : GEN xp = Q_primitive_part(x,&cex);
1864 83268 : if (nfchecksigns_i(nf, xp, signs, archp)) set_avma(av);
1865 : else
1866 : {
1867 55024 : ex = cgetg(l,t_COL);
1868 138499 : for (i = 1; i < l; i++) gel(ex,i) = zk_embed(M,xp,archp[i]);
1869 55024 : if (cex) ex = RgC_Rg_mul(ex, cex); /* put back content */
1870 : }
1871 : }
1872 697024 : if (ex)
1873 : { /* If no, fix it */
1874 585323 : GEN MI = sarch_get_MI(sarch), F = sarch_get_F(sarch);
1875 585323 : GEN lambda = sarch_get_lambda(sarch);
1876 585323 : GEN t = RgC_sub(get_C(lambda, l, signs), ex);
1877 585323 : t = grndtoi(RgM_RgC_mul(MI,t), NULL);
1878 585323 : if (lg(F) != 1) t = ZM_ZC_mul(F, t);
1879 585323 : x = typ(x) == t_COL? RgC_add(t, x): RgC_Rg_add(t, x);
1880 : }
1881 697024 : return x;
1882 : }
1883 : /* - true nf
1884 : * - sarch = nfarchstar(nf, F);
1885 : * - x encodes a vector of signs at arch.archp: either a t_VECSMALL
1886 : * (vector of signs as {0,1}-vector), NULL (totally positive at archp),
1887 : * or a nonzero number field element (replaced by its signature at archp);
1888 : * - y is a nonzero number field element
1889 : * Return z = y (mod F) with signs(y, archp) = signs(x) (a {0,1}-vector).
1890 : * Not stack-clean */
1891 : GEN
1892 722733 : set_sign_mod_divisor(GEN nf, GEN x, GEN y, GEN sarch)
1893 : {
1894 722733 : GEN archp = sarch_get_archp(sarch);
1895 722733 : if (lg(archp) == 1) return y;
1896 695174 : if (x && typ(x) != t_VECSMALL) x = nfsign_arch(nf, x, archp);
1897 695174 : return nfsetsigns(nf, x, nf_to_scalar_or_basis(nf,y), sarch);
1898 : }
1899 :
1900 : static GEN
1901 386323 : setsigns_init(GEN nf, GEN archp, GEN F, GEN DATA)
1902 : {
1903 386323 : GEN lambda, Mr = rowpermute(nf_get_M(nf), archp), MI = F? RgM_mul(Mr,F): Mr;
1904 386323 : lambda = gmul2n(matrixnorm(MI,DEFAULTPREC), -1);
1905 386323 : if (typ(lambda) != t_REAL) lambda = gmul(lambda, uutoQ(1001,1000));
1906 386323 : if (lg(archp) < lg(MI))
1907 : {
1908 69541 : GEN perm = gel(indexrank(MI), 2);
1909 69541 : if (!F) F = matid(nf_get_degree(nf));
1910 69541 : MI = vecpermute(MI, perm);
1911 69541 : F = vecpermute(F, perm);
1912 : }
1913 386323 : if (!F) F = cgetg(1,t_MAT);
1914 386323 : MI = RgM_inv(MI);
1915 386323 : return mkvec5(DATA, archp, MI, lambda, F);
1916 : }
1917 : /* F nonzero integral ideal in HNF (or NULL: Z_K), compute elements in 1+F
1918 : * whose sign matrix at archp is identity; archp in 'indices' format */
1919 : GEN
1920 539026 : nfarchstar(GEN nf, GEN F, GEN archp)
1921 : {
1922 539026 : long nba = lg(archp) - 1;
1923 539026 : if (!nba) return mkvec2(cgetg(1,t_VEC), archp);
1924 384479 : if (F && equali1(gcoeff(F,1,1))) F = NULL;
1925 384479 : if (F) F = idealpseudored(F, nf_get_roundG(nf));
1926 384479 : return setsigns_init(nf, archp, F, const_vec(nba, gen_2));
1927 : }
1928 :
1929 : /*************************************************************************/
1930 : /** **/
1931 : /** IDEALCHINESE **/
1932 : /** **/
1933 : /*************************************************************************/
1934 : static int
1935 5252 : isprfact(GEN x)
1936 : {
1937 : long i, l;
1938 : GEN L, E;
1939 5252 : if (typ(x) != t_MAT || lg(x) != 3) return 0;
1940 5252 : L = gel(x,1); l = lg(L);
1941 5252 : E = gel(x,2);
1942 16134 : for(i=1; i<l; i++)
1943 : {
1944 10882 : checkprid(gel(L,i));
1945 10882 : if (typ(gel(E,i)) != t_INT) return 0;
1946 : }
1947 5252 : return 1;
1948 : }
1949 :
1950 : /* initialize projectors mod pr[i]^e[i] for idealchinese */
1951 : static GEN
1952 5252 : pr_init(GEN nf, GEN fa, GEN w, GEN dw)
1953 : {
1954 5252 : GEN U, E, F, FZ, L = gel(fa,1), E0 = gel(fa,2);
1955 5252 : long i, r = lg(L);
1956 :
1957 5252 : if (w && lg(w) != r) pari_err_TYPE("idealchinese", w);
1958 5252 : if (r == 1 && !dw) return cgetg(1,t_VEC);
1959 5240 : E = leafcopy(E0); /* do not destroy fa[2] */
1960 16122 : for (i = 1; i < r; i++)
1961 10882 : if (signe(gel(E,i)) < 0) gel(E,i) = gen_0;
1962 5240 : F = factorbackprime(nf, L, E);
1963 5240 : if (dw)
1964 : {
1965 516 : F = ZM_Z_mul(F, dw);
1966 1202 : for (i = 1; i < r; i++)
1967 : {
1968 686 : GEN pr = gel(L,i);
1969 686 : long e = itos(gel(E0,i)), v = idealval(nf, dw, pr);
1970 686 : if (e >= 0)
1971 680 : gel(E,i) = addiu(gel(E,i), v);
1972 6 : else if (v + e <= 0)
1973 0 : F = idealmulpowprime(nf, F, pr, stoi(-v)); /* coprime to pr */
1974 : else
1975 : {
1976 6 : F = idealmulpowprime(nf, F, pr, stoi(e));
1977 6 : gel(E,i) = stoi(v + e);
1978 : }
1979 : }
1980 : }
1981 5240 : U = cgetg(r, t_VEC);
1982 16122 : for (i = 1; i < r; i++)
1983 : {
1984 : GEN u;
1985 10882 : if (w && gequal0(gel(w,i))) u = gen_0; /* unused */
1986 : else
1987 : {
1988 10816 : GEN pr = gel(L,i), e = gel(E,i), t;
1989 10816 : t = idealdivpowprime(nf,F, pr, e);
1990 10816 : u = hnfmerge_get_1(t, idealpow(nf, pr, e));
1991 10816 : if (!u) pari_err_COPRIME("idealchinese", t,pr);
1992 : }
1993 10882 : gel(U,i) = u;
1994 : }
1995 5240 : FZ = gcoeff(F, 1, 1);
1996 5240 : F = idealpseudored(F, nf_get_roundG(nf));
1997 5240 : return mkvec2(mkvec2(F, FZ), U);
1998 : }
1999 :
2000 : static GEN
2001 2490 : pl_normalize(GEN nf, GEN pl)
2002 : {
2003 2490 : const char *fun = "idealchinese";
2004 2490 : if (lg(pl)-1 != nf_get_r1(nf)) pari_err_TYPE(fun,pl);
2005 2490 : switch(typ(pl))
2006 : {
2007 528 : case t_VEC: RgV_check_ZV(pl,fun); pl = ZV_to_zv(pl);
2008 : /* fall through */
2009 2490 : case t_VECSMALL: break;
2010 0 : default: pari_err_TYPE(fun,pl);
2011 : }
2012 2490 : return pl;
2013 : }
2014 :
2015 : static int
2016 11145 : is_chineseinit(GEN x)
2017 : {
2018 : GEN fa, pl;
2019 : long l;
2020 11145 : if (typ(x) != t_VEC || lg(x)!=3) return 0;
2021 9027 : fa = gel(x,1);
2022 9027 : pl = gel(x,2);
2023 9027 : if (typ(fa) != t_VEC || typ(pl) != t_VEC) return 0;
2024 5631 : l = lg(fa);
2025 5631 : if (l != 1)
2026 : {
2027 : GEN z;
2028 5595 : if (l != 3) return 0;
2029 5595 : z = gel(fa, 1);
2030 5595 : if (typ(z) != t_VEC || lg(z) != 3 || typ(gel(z,1)) != t_MAT
2031 5589 : || typ(gel(z,2)) != t_INT
2032 5589 : || typ(gel(fa,2)) != t_VEC)
2033 6 : return 0;
2034 : }
2035 5625 : l = lg(pl);
2036 5625 : if (l != 1)
2037 : {
2038 974 : if (l != 6 || typ(gel(pl,3)) != t_MAT || typ(gel(pl,1)) != t_VECSMALL
2039 974 : || typ(gel(pl,2)) != t_VECSMALL)
2040 0 : return 0;
2041 : }
2042 5625 : return 1;
2043 : }
2044 :
2045 : /* nf a true 'nf' */
2046 : static GEN
2047 5654 : chineseinit_i(GEN nf, GEN fa, GEN w, GEN dw)
2048 : {
2049 5654 : const char *fun = "idealchineseinit";
2050 5654 : GEN archp = NULL, pl = NULL;
2051 5654 : switch(typ(fa))
2052 : {
2053 2490 : case t_VEC:
2054 2490 : if (is_chineseinit(fa))
2055 : {
2056 0 : if (dw) pari_err_DOMAIN(fun, "denom(y)", "!=", gen_1, w);
2057 0 : return fa;
2058 : }
2059 2490 : if (lg(fa) != 3) pari_err_TYPE(fun, fa);
2060 : /* of the form [x,s] */
2061 2490 : pl = pl_normalize(nf, gel(fa,2));
2062 2490 : fa = gel(fa,1);
2063 2490 : archp = vecsmall01_to_indices(pl);
2064 : /* keep pr_init, reset pl */
2065 2490 : if (is_chineseinit(fa)) { fa = gel(fa,1); break; }
2066 : /* fall through */
2067 : case t_MAT: /* factorization? */
2068 5252 : if (isprfact(fa)) { fa = pr_init(nf, fa, w, dw); break; }
2069 0 : default: pari_err_TYPE(fun,fa);
2070 : }
2071 :
2072 5654 : if (!pl) pl = cgetg(1,t_VEC);
2073 : else
2074 : {
2075 2490 : long r = lg(archp);
2076 2490 : if (r == 1) pl = cgetg(1, t_VEC);
2077 : else
2078 : {
2079 1844 : GEN F = (lg(fa) == 1)? NULL: gmael(fa,1,1), signs = cgetg(r, t_VECSMALL);
2080 : long i;
2081 5162 : for (i = 1; i < r; i++) signs[i] = (pl[archp[i]] < 0)? 1: 0;
2082 1844 : pl = setsigns_init(nf, archp, F, signs);
2083 : }
2084 : }
2085 5654 : return mkvec2(fa, pl);
2086 : }
2087 :
2088 : /* Given a prime ideal factorization x, possibly with 0 or negative exponents,
2089 : * and a vector w of elements of nf, gives b such that
2090 : * v_p(b-w_p)>=v_p(x) for all prime ideals p in the ideal factorization
2091 : * and v_p(b)>=0 for all other p, using the standard proof given in GTM 138. */
2092 : GEN
2093 10877 : idealchinese(GEN nf, GEN x0, GEN w)
2094 : {
2095 10877 : const char *fun = "idealchinese";
2096 10877 : pari_sp av = avma;
2097 10877 : GEN x = x0, x1, x2, s, dw, F;
2098 :
2099 10877 : nf = checknf(nf);
2100 10877 : if (!w) return gc_GEN(av, chineseinit_i(nf,x,NULL,NULL));
2101 :
2102 6165 : if (typ(w) != t_VEC) pari_err_TYPE(fun,w);
2103 6165 : w = Q_remove_denom(matalgtobasis(nf,w), &dw);
2104 6165 : if (!is_chineseinit(x)) x = chineseinit_i(nf,x,w,dw);
2105 : /* x is a 'chineseinit' */
2106 6165 : x1 = gel(x,1); s = NULL;
2107 6165 : x2 = gel(x,2);
2108 6165 : if (lg(x1) == 1) { F = NULL; dw = NULL; }
2109 : else
2110 : {
2111 6129 : GEN U = gel(x1,2), FZ;
2112 6129 : long i, r = lg(w);
2113 6129 : F = gmael(x1,1,1); FZ = gmael(x1,1,2);
2114 20181 : for (i=1; i<r; i++)
2115 14052 : if (!ZV_equal0(gel(w,i)))
2116 : {
2117 10510 : GEN t = nfmuli(nf, gel(U,i), gel(w,i));
2118 10510 : s = s? ZC_add(s,t): t;
2119 : }
2120 6129 : if (s)
2121 : {
2122 6111 : s = ZC_reducemodmatrix(s, F);
2123 6111 : if (dw && x == x0) /* input was a chineseinit */
2124 : {
2125 6 : dw = modii(dw, FZ);
2126 6 : s = FpC_Fp_mul(s, Fp_inv(dw, FZ), FZ);
2127 6 : dw = NULL;
2128 : }
2129 6111 : if (ZV_isscalar(s)) s = icopy(gel(s,1));
2130 : }
2131 : }
2132 6165 : if (lg(x2) != 1)
2133 : {
2134 1850 : s = nfsetsigns(nf, gel(x2,1), s? s: gen_0, x2);
2135 1850 : if (typ(s) == t_COL && QV_isscalar(s))
2136 : {
2137 372 : s = gel(s,1); if (!dw) s = gcopy(s);
2138 : }
2139 : }
2140 4315 : else if (!s) return gc_const(av, gen_0);
2141 6123 : return gc_upto(av, dw? gdiv(s, dw): s);
2142 : }
2143 :
2144 : /*************************************************************************/
2145 : /** **/
2146 : /** (Z_K/I)^* **/
2147 : /** **/
2148 : /*************************************************************************/
2149 : GEN
2150 2490 : vecsmall01_to_indices(GEN v)
2151 : {
2152 2490 : long i, k, l = lg(v);
2153 2490 : GEN p = new_chunk(l) + l;
2154 6982 : for (k=1, i=l-1; i; i--)
2155 4492 : if (v[i]) { *--p = i; k++; }
2156 2490 : *--p = _evallg(k) | evaltyp(t_VECSMALL);
2157 2490 : set_avma((pari_sp)p); return p;
2158 : }
2159 : GEN
2160 1082876 : vec01_to_indices(GEN v)
2161 : {
2162 : long i, k, l;
2163 : GEN p;
2164 :
2165 1082876 : switch (typ(v))
2166 : {
2167 1032082 : case t_VECSMALL: return v;
2168 50794 : case t_VEC: break;
2169 0 : default: pari_err_TYPE("vec01_to_indices",v);
2170 : }
2171 50794 : l = lg(v);
2172 50794 : p = new_chunk(l) + l;
2173 152781 : for (k=1, i=l-1; i; i--)
2174 101987 : if (signe(gel(v,i))) { *--p = i; k++; }
2175 50794 : *--p = _evallg(k) | evaltyp(t_VECSMALL);
2176 50794 : set_avma((pari_sp)p); return p;
2177 : }
2178 : GEN
2179 122935 : indices_to_vec01(GEN p, long r)
2180 : {
2181 122935 : long i, l = lg(p);
2182 122935 : GEN v = zerovec(r);
2183 186438 : for (i = 1; i < l; i++) gel(v, p[i]) = gen_1;
2184 122935 : return v;
2185 : }
2186 :
2187 : /* return (column) vector of R1 signatures of x (0 or 1) */
2188 : GEN
2189 1032082 : nfsign_arch(GEN nf, GEN x, GEN arch)
2190 : {
2191 1032082 : GEN sarch, V, archp = vec01_to_indices(arch);
2192 1032082 : long i, s, np, npc, r1, n = lg(archp)-1;
2193 : pari_sp av;
2194 :
2195 1032082 : if (!n) return cgetg(1,t_VECSMALL);
2196 856861 : if (typ(x) == t_MAT)
2197 : { /* factorisation */
2198 267480 : GEN g = gel(x,1), e = gel(x,2);
2199 267480 : long l = lg(g);
2200 267480 : V = zero_zv(n);
2201 751766 : for (i = 1; i < l; i++)
2202 484286 : if (mpodd(gel(e,i)))
2203 398774 : Flv_add_inplace(V, nfsign_arch(nf,gel(g,i),archp), 2);
2204 267480 : set_avma((pari_sp)V); return V;
2205 : }
2206 589381 : av = avma; V = cgetg(n+1,t_VECSMALL);
2207 589381 : x = nf_to_scalar_or_basis(nf, x);
2208 589381 : switch(typ(x))
2209 : {
2210 166200 : case t_INT:
2211 166200 : s = signe(x);
2212 166200 : if (!s) pari_err_DOMAIN("nfsign_arch","element","=",gen_0,x);
2213 166200 : set_avma(av); return const_vecsmall(n, (s < 0)? 1: 0);
2214 552 : case t_FRAC:
2215 552 : s = signe(gel(x,1));
2216 552 : set_avma(av); return const_vecsmall(n, (s < 0)? 1: 0);
2217 : }
2218 422629 : r1 = nf_get_r1(nf); x = Q_primpart(x); np = num_positive(nf, x);
2219 422629 : if (np == 0) { set_avma(av); return const_vecsmall(n, 1); }
2220 373061 : if (np == r1){ set_avma(av); return const_vecsmall(n, 0); }
2221 250860 : sarch = nfarchstar(nf, NULL, identity_perm(r1));
2222 361349 : for (i = 1, npc = 0; i <= n; i++)
2223 : {
2224 360184 : GEN xi = set_sign_mod_divisor(nf, vecsmall_ei(r1, archp[i]), gen_1, sarch);
2225 : long ni;
2226 360184 : xi = Q_primpart(xi);
2227 360184 : ni = num_positive(nf, nfmuli(nf,x,xi));
2228 360184 : V[i] = ni < np? 0: 1;
2229 360184 : if (!V[i]) npc++; /* found a positive root */
2230 360184 : if (npc == np)
2231 : { /* found all positive roots */
2232 266274 : for (i++; i <= n; i++) V[i] = 1;
2233 144294 : break;
2234 : }
2235 215890 : if (i - npc == r1 - np)
2236 : { /* found all negative roots */
2237 167870 : for (i++; i <= n; i++) V[i] = 0;
2238 105401 : break;
2239 : }
2240 : }
2241 250860 : set_avma((pari_sp)V); return V;
2242 : }
2243 : static void
2244 31377 : chk_ind(const char *s, long i, long r1)
2245 : {
2246 31377 : if (i <= 0) pari_err_DOMAIN(s, "index", "<=", gen_0, stoi(i));
2247 31366 : if (i > r1) pari_err_DOMAIN(s, "index", ">", utoi(r1), utoi(i));
2248 31338 : }
2249 : static GEN
2250 110247 : parse_embed(GEN ind, long r, const char *f)
2251 : {
2252 : long l, i;
2253 110247 : if (!ind) return identity_perm(r);
2254 29576 : switch(typ(ind))
2255 : {
2256 57 : case t_INT: ind = mkvecsmall(itos(ind)); break;
2257 69 : case t_VEC: case t_COL: ind = vec_to_vecsmall(ind); break;
2258 29450 : case t_VECSMALL: break;
2259 0 : default: pari_err_TYPE(f, ind);
2260 : }
2261 29576 : l = lg(ind);
2262 60914 : for (i = 1; i < l; i++) chk_ind(f, ind[i], r);
2263 29537 : return ind;
2264 : }
2265 : GEN
2266 107942 : nfeltsign(GEN nf, GEN x, GEN ind0)
2267 : {
2268 107942 : pari_sp av = avma;
2269 : long i, l;
2270 : GEN v, ind;
2271 107942 : nf = checknf(nf);
2272 107942 : ind = parse_embed(ind0, nf_get_r1(nf), "nfeltsign");
2273 107924 : l = lg(ind);
2274 107924 : if (is_rational_t(typ(x)))
2275 : { /* nfsign_arch would test this, but avoid converting t_VECSMALL -> t_VEC */
2276 : GEN s;
2277 27250 : switch(gsigne(x))
2278 : {
2279 14250 : case -1:s = gen_m1; break;
2280 12994 : case 1: s = gen_1; break;
2281 6 : default: s = gen_0; break;
2282 : }
2283 27250 : set_avma(av);
2284 27250 : return (ind0 && typ(ind0) == t_INT)? s: const_vec(l-1, s);
2285 : }
2286 80674 : v = nfsign_arch(nf, x, ind);
2287 80674 : if (ind0 && typ(ind0) == t_INT) { set_avma(av); return v[1]? gen_m1: gen_1; }
2288 80662 : settyp(v, t_VEC);
2289 226193 : for (i = 1; i < l; i++) gel(v,i) = v[i]? gen_m1: gen_1;
2290 80662 : return gc_upto(av, v);
2291 : }
2292 :
2293 : /* true nf */
2294 : GEN
2295 568 : nfeltembed_i(GEN *pnf, GEN x, GEN ind0, long prec0)
2296 : {
2297 : long i, e, l, r1, r2, prec, prec1;
2298 568 : GEN v, ind, cx, nf = *pnf;
2299 568 : nf_get_sign(nf,&r1,&r2);
2300 568 : x = nf_to_scalar_or_basis(nf, x);
2301 562 : ind = parse_embed(ind0, r1+r2, "nfeltembed");
2302 556 : l = lg(ind);
2303 556 : if (typ(x) != t_COL)
2304 : {
2305 160 : if (!(ind0 && typ(ind0) == t_INT)) x = const_vec(l-1, x);
2306 160 : return x;
2307 : }
2308 396 : x = Q_primitive_part(x, &cx);
2309 396 : prec1 = prec0; e = gexpo(x);
2310 396 : if (e > 8) prec1 += nbits2extraprec(e);
2311 396 : prec = prec1;
2312 396 : if (nf_get_prec(nf) < prec) nf = nfnewprec_shallow(nf, prec);
2313 396 : v = cgetg(l, t_VEC);
2314 : for(;;)
2315 105 : {
2316 501 : GEN M = nf_get_M(nf);
2317 2026 : for (i = 1; i < l; i++)
2318 : {
2319 1630 : GEN t = nfembed_i(M, x, ind[i]);
2320 1630 : long e = gexpo(t);
2321 1630 : if (gequal0(t) || precision(t) < prec0
2322 1630 : || (e < 0 && prec < prec1 + nbits2extraprec(-e)) ) break;
2323 1525 : if (cx) t = gmul(t, cx);
2324 1525 : gel(v,i) = t;
2325 : }
2326 501 : if (i == l) break;
2327 105 : prec = precdbl(prec);
2328 105 : if (DEBUGLEVEL>1) pari_warn(warnprec,"eltnfembed", prec);
2329 105 : *pnf = nf = nfnewprec_shallow(nf, prec);
2330 : }
2331 396 : if (ind0 && typ(ind0) == t_INT) v = gel(v,1);
2332 396 : return v;
2333 : }
2334 : GEN
2335 568 : nfeltembed(GEN nf, GEN x, GEN ind0, long prec0)
2336 : {
2337 568 : pari_sp av = avma; nf = checknf(nf);
2338 568 : return gc_GEN(av, nfeltembed_i(&nf, x, ind0, prec0));
2339 : }
2340 :
2341 : /* number of distinct roots of sigma(f) */
2342 : GEN
2343 1743 : nfpolsturm(GEN nf, GEN f, GEN ind0)
2344 : {
2345 1743 : pari_sp av = avma;
2346 : long d, l, r1, single;
2347 : GEN ind, u, v, vr1, T, s, t;
2348 :
2349 1743 : nf = checknf(nf); T = nf_get_pol(nf); r1 = nf_get_r1(nf);
2350 1743 : ind = parse_embed(ind0, r1, "nfpolsturm");
2351 1728 : single = ind0 && typ(ind0) == t_INT;
2352 1728 : l = lg(ind);
2353 :
2354 1728 : if (gequal0(f)) pari_err_ROOTS0("nfpolsturm");
2355 1723 : if (typ(f) == t_POL && varn(f) != varn(T))
2356 : {
2357 1708 : f = RgX_nffix("nfpolsturm", T, f,1);
2358 1708 : if (lg(f) == 3) f = NULL;
2359 : }
2360 : else
2361 : {
2362 15 : (void)Rg_nffix("nfpolsturm", T, f, 0);
2363 15 : f = NULL;
2364 : }
2365 1723 : if (!f) { set_avma(av); return single? gen_0: zerovec(l-1); }
2366 1708 : d = degpol(f);
2367 1708 : if (d == 1) { set_avma(av); return single? gen_1: const_vec(l-1,gen_1); }
2368 :
2369 1630 : vr1 = const_vecsmall(l-1, 1);
2370 1630 : u = Q_primpart(f); s = ZV_to_zv(nfeltsign(nf, gel(u,d+2), ind));
2371 1630 : v = RgX_deriv(u); t = odd(d)? leafcopy(s): zv_neg(s);
2372 : for(;;)
2373 258 : {
2374 1888 : GEN r = RgX_neg( Q_primpart(RgX_pseudorem(u, v)) ), sr;
2375 1888 : long i, dr = degpol(r);
2376 1888 : if (dr < 0) break;
2377 1888 : sr = ZV_to_zv(nfeltsign(nf, gel(r,dr+2), ind));
2378 4463 : for (i = 1; i < l; i++)
2379 2575 : if (sr[i] != s[i]) { s[i] = sr[i], vr1[i]--; }
2380 1888 : if (odd(dr)) sr = zv_neg(sr);
2381 4463 : for (i = 1; i < l; i++)
2382 2575 : if (sr[i] != t[i]) { t[i] = sr[i], vr1[i]++; }
2383 1888 : if (!dr) break;
2384 258 : u = v; v = r;
2385 : }
2386 1630 : if (single) return gc_stoi(av,vr1[1]);
2387 1625 : return gc_upto(av, zv_to_ZV(vr1));
2388 : }
2389 :
2390 : /* True nf; return the vector of signs of x; the matrix of such if x is a vector
2391 : * of nf elements */
2392 : GEN
2393 46203 : nfsign(GEN nf, GEN x)
2394 : {
2395 : long i, l;
2396 : GEN archp, S;
2397 :
2398 46203 : archp = identity_perm( nf_get_r1(nf) );
2399 46203 : if (typ(x) != t_VEC) return nfsign_arch(nf, x, archp);
2400 38997 : l = lg(x); S = cgetg(l, t_MAT);
2401 168252 : for (i=1; i<l; i++) gel(S,i) = nfsign_arch(nf, gel(x,i), archp);
2402 38997 : return S;
2403 : }
2404 :
2405 : /* x integral elt, A integral ideal in HNF; reduce x mod A */
2406 : static GEN
2407 6814874 : zk_modHNF(GEN x, GEN A)
2408 6814874 : { return (typ(x) == t_COL)? ZC_hnfrem(x, A): modii(x, gcoeff(A,1,1)); }
2409 :
2410 : /* given an element x in Z_K and an integral ideal y in HNF, coprime with x,
2411 : outputs an element inverse of x modulo y */
2412 : GEN
2413 148 : nfinvmodideal(GEN nf, GEN x, GEN y)
2414 : {
2415 148 : pari_sp av = avma;
2416 148 : GEN a, yZ = gcoeff(y,1,1);
2417 :
2418 148 : if (equali1(yZ)) return gen_0;
2419 148 : x = nf_to_scalar_or_basis(nf, x);
2420 148 : if (typ(x) == t_INT) return gc_upto(av, Fp_inv(x, yZ));
2421 :
2422 67 : a = hnfmerge_get_1(idealhnf_principal(nf,x), y);
2423 67 : if (!a) pari_err_INV("nfinvmodideal", x);
2424 67 : return gc_upto(av, zk_modHNF(nfdiv(nf,a,x), y));
2425 : }
2426 :
2427 : static GEN
2428 2353191 : nfsqrmodideal(GEN nf, GEN x, GEN id)
2429 2353191 : { return zk_modHNF(nfsqri(nf,x), id); }
2430 : static GEN
2431 6581804 : nfmulmodideal(GEN nf, GEN x, GEN y, GEN id)
2432 6581804 : { return x? zk_modHNF(nfmuli(nf,x,y), id): y; }
2433 : /* assume x integral, k integer, A in HNF */
2434 : GEN
2435 5454653 : nfpowmodideal(GEN nf,GEN x,GEN k,GEN A)
2436 : {
2437 5454653 : long s = signe(k);
2438 : pari_sp av;
2439 : GEN y;
2440 :
2441 5454653 : if (!s) return gen_1;
2442 5454653 : av = avma;
2443 5454653 : x = nf_to_scalar_or_basis(nf, x);
2444 5454653 : if (typ(x) != t_COL) return Fp_pow(x, k, gcoeff(A,1,1));
2445 2349839 : if (s < 0) { k = negi(k); x = nfinvmodideal(nf, x,A); }
2446 2349839 : if (equali1(k)) return gc_upto(av, s > 0? zk_modHNF(x, A): x);
2447 1056338 : for(y = NULL;;)
2448 : {
2449 3409529 : if (mpodd(k)) y = nfmulmodideal(nf,y,x,A);
2450 3409529 : k = shifti(k,-1); if (!signe(k)) break;
2451 2353191 : x = nfsqrmodideal(nf,x,A);
2452 : }
2453 1056338 : return gc_upto(av, y);
2454 : }
2455 :
2456 : /* a * g^n mod id */
2457 : static GEN
2458 4267917 : nfmulpowmodideal(GEN nf, GEN a, GEN g, GEN n, GEN id)
2459 : {
2460 4267917 : return nfmulmodideal(nf, a, nfpowmodideal(nf,g,n,id), id);
2461 : }
2462 :
2463 : /* assume (num(g[i]), id) = 1 for all i. Return prod g[i]^e[i] mod id.
2464 : * EX = multiple of exponent of (O_K/id)^* */
2465 : GEN
2466 2482631 : famat_to_nf_modideal_coprime(GEN nf, GEN g, GEN e, GEN id, GEN EX)
2467 : {
2468 2482631 : GEN EXo2, plus = NULL, minus = NULL, idZ = gcoeff(id,1,1);
2469 2482631 : long i, lx = lg(g);
2470 :
2471 2482631 : if (equali1(idZ)) return gen_1; /* id = Z_K */
2472 2482247 : EXo2 = (expi(EX) > 10)? shifti(EX,-1): NULL;
2473 7728597 : for (i = 1; i < lx; i++)
2474 : {
2475 5246350 : GEN h, n = centermodii(gel(e,i), EX, EXo2);
2476 5246350 : long sn = signe(n);
2477 5246350 : if (!sn) continue;
2478 :
2479 3641237 : h = nf_to_scalar_or_basis(nf, gel(g,i));
2480 3641237 : switch(typ(h))
2481 : {
2482 2229494 : case t_INT: break;
2483 0 : case t_FRAC:
2484 0 : h = Fp_div(gel(h,1), gel(h,2), idZ); break;
2485 1411743 : default:
2486 : {
2487 : GEN dh;
2488 1411743 : h = Q_remove_denom(h, &dh);
2489 1411743 : if (dh) h = FpC_Fp_mul(h, Fp_inv(dh,idZ), idZ);
2490 : }
2491 : }
2492 3641237 : if (sn > 0)
2493 3639664 : plus = nfmulpowmodideal(nf, plus, h, n, id);
2494 : else /* sn < 0 */
2495 1573 : minus = nfmulpowmodideal(nf, minus, h, negi(n), id);
2496 : }
2497 2482247 : if (minus) plus = nfmulmodideal(nf, plus, nfinvmodideal(nf,minus,id), id);
2498 2482247 : return plus? plus: gen_1;
2499 : }
2500 :
2501 : /* given 2 integral ideals x, y in HNF s.t x | y | x^2, compute (1+x)/(1+y) in
2502 : * the form [[cyc],[gen], U], where U := ux^-1 as a pair [ZM, denom(U)] */
2503 : static GEN
2504 235640 : zidealij(GEN x, GEN y)
2505 : {
2506 235640 : GEN U, G, cyc, xp = gcoeff(x,1,1), xi = hnf_invscale(x, xp);
2507 : long j, N;
2508 :
2509 : /* x^(-1) y = relations between the 1 + x_i (HNF) */
2510 235640 : cyc = ZM_snf_group(ZM_Z_divexact(ZM_mul(xi, y), xp), &U, &G);
2511 235640 : N = lg(cyc); G = ZM_mul(x,G); settyp(G, t_VEC); /* new generators */
2512 558032 : for (j=1; j<N; j++)
2513 : {
2514 322392 : GEN c = gel(G,j);
2515 322392 : gel(c,1) = addiu(gel(c,1), 1); /* 1 + g_j */
2516 322392 : if (ZV_isscalar(c)) gel(G,j) = gel(c,1);
2517 : }
2518 235640 : return mkvec4(cyc, G, ZM_mul(U,xi), xp);
2519 : }
2520 :
2521 : /* lg(x) > 1, x + 1; shallow */
2522 : static GEN
2523 175299 : ZC_add1(GEN x)
2524 : {
2525 175299 : long i, l = lg(x);
2526 175299 : GEN y = cgetg(l, t_COL);
2527 403167 : for (i = 2; i < l; i++) gel(y,i) = gel(x,i);
2528 175299 : gel(y,1) = addiu(gel(x,1), 1); return y;
2529 : }
2530 : /* lg(x) > 1, x - 1; shallow */
2531 : static GEN
2532 61388 : ZC_sub1(GEN x)
2533 : {
2534 61388 : long i, l = lg(x);
2535 61388 : GEN y = cgetg(l, t_COL);
2536 155273 : for (i = 2; i < l; i++) gel(y,i) = gel(x,i);
2537 61388 : gel(y,1) = subiu(gel(x,1), 1); return y;
2538 : }
2539 :
2540 : /* x,y are t_INT or ZC */
2541 : static GEN
2542 0 : zkadd(GEN x, GEN y)
2543 : {
2544 0 : long tx = typ(x);
2545 0 : if (tx == typ(y))
2546 0 : return tx == t_INT? addii(x,y): ZC_add(x,y);
2547 : else
2548 0 : return tx == t_INT? ZC_Z_add(y,x): ZC_Z_add(x,y);
2549 : }
2550 : /* x a t_INT or ZC, x+1; shallow */
2551 : static GEN
2552 258458 : zkadd1(GEN x)
2553 : {
2554 258458 : long tx = typ(x);
2555 258458 : return tx == t_INT? addiu(x,1): ZC_add1(x);
2556 : }
2557 : /* x a t_INT or ZC, x-1; shallow */
2558 : static GEN
2559 258458 : zksub1(GEN x)
2560 : {
2561 258458 : long tx = typ(x);
2562 258458 : return tx == t_INT? subiu(x,1): ZC_sub1(x);
2563 : }
2564 : /* x,y are t_INT or ZC; x - y */
2565 : static GEN
2566 0 : zksub(GEN x, GEN y)
2567 : {
2568 0 : long tx = typ(x), ty = typ(y);
2569 0 : if (tx == ty)
2570 0 : return tx == t_INT? subii(x,y): ZC_sub(x,y);
2571 : else
2572 0 : return tx == t_INT? Z_ZC_sub(x,y): ZC_Z_sub(x,y);
2573 : }
2574 : /* x is t_INT or ZM (mult. map), y is t_INT or ZC; x * y */
2575 : static GEN
2576 258458 : zkmul(GEN x, GEN y)
2577 : {
2578 258458 : long tx = typ(x), ty = typ(y);
2579 258458 : if (ty == t_INT)
2580 197070 : return tx == t_INT? mulii(x,y): ZC_Z_mul(gel(x,1),y);
2581 : else
2582 61388 : return tx == t_INT? ZC_Z_mul(y,x): ZM_ZC_mul(x,y);
2583 : }
2584 :
2585 : /* (U,V) = 1 coprime ideals. Want z = x mod U, = y mod V; namely
2586 : * z =vx + uy = v(x-y) + y, where u + v = 1, u in U, v in V.
2587 : * zkc = [v, UV], v a t_INT or ZM (mult. by v map), UV a ZM (ideal in HNF);
2588 : * shallow */
2589 : GEN
2590 0 : zkchinese(GEN zkc, GEN x, GEN y)
2591 : {
2592 0 : GEN v = gel(zkc,1), UV = gel(zkc,2), z = zkadd(zkmul(v, zksub(x,y)), y);
2593 0 : return zk_modHNF(z, UV);
2594 : }
2595 : /* special case z = x mod U, = 1 mod V; shallow */
2596 : GEN
2597 258458 : zkchinese1(GEN zkc, GEN x)
2598 : {
2599 258458 : GEN v = gel(zkc,1), UV = gel(zkc,2), z = zkadd1(zkmul(v, zksub1(x)));
2600 258458 : return (typ(z) == t_INT)? z: ZC_hnfrem(z, UV);
2601 : }
2602 : static GEN
2603 231728 : zkVchinese1(GEN zkc, GEN v)
2604 : {
2605 : long i, ly;
2606 231728 : GEN y = cgetg_copy(v, &ly);
2607 490186 : for (i=1; i<ly; i++) gel(y,i) = zkchinese1(zkc, gel(v,i));
2608 231728 : return y;
2609 : }
2610 :
2611 : /* prepare to solve z = x (mod A), z = y mod (B) [zkchinese or zkchinese1] */
2612 : GEN
2613 231506 : zkchineseinit(GEN nf, GEN A, GEN B, GEN AB)
2614 : {
2615 231506 : GEN v = idealaddtoone_raw(nf, A, B);
2616 : long e;
2617 231506 : if ((e = gexpo(v)) > 5)
2618 : {
2619 71395 : GEN b = (typ(v) == t_COL)? v: scalarcol_shallow(v, nf_get_degree(nf));
2620 71395 : b= ZC_reducemodlll(b, AB);
2621 71395 : if (gexpo(b) < e) v = b;
2622 : }
2623 231506 : return mkvec2(zk_scalar_or_multable(nf,v), AB);
2624 : }
2625 : /* prepare to solve z = x (mod A), z = 1 mod (B)
2626 : * and then z = 1 (mod A), z = y mod (B) [zkchinese1 twice] */
2627 : static GEN
2628 222 : zkchinese1init2(GEN nf, GEN A, GEN B, GEN AB)
2629 : {
2630 222 : GEN zkc = zkchineseinit(nf, A, B, AB);
2631 222 : GEN mv = gel(zkc,1), mu;
2632 222 : if (typ(mv) == t_INT) return mkvec2(zkc, mkvec2(subui(1,mv),AB));
2633 30 : mu = RgM_Rg_add_shallow(ZM_neg(mv), gen_1);
2634 30 : return mkvec2(mkvec2(mv,AB), mkvec2(mu,AB));
2635 : }
2636 :
2637 : static GEN
2638 2372981 : apply_U(GEN L, GEN a)
2639 : {
2640 2372981 : GEN e, U = gel(L,3), dU = gel(L,4);
2641 2372981 : if (typ(a) == t_INT)
2642 828548 : e = ZC_Z_mul(gel(U,1), subiu(a, 1));
2643 : else
2644 : { /* t_COL */
2645 1544433 : GEN t = shallowcopy(a);
2646 1544433 : gel(t,1) = subiu(gel(t,1), 1); /* t = a - 1 */
2647 1544433 : e = ZM_ZC_mul(U, t);
2648 : }
2649 2372981 : return gdiv(e, dU);
2650 : }
2651 :
2652 : /* true nf; vectors of [[cyc],[g],U.X^-1]. Assume k > 1. */
2653 : static GEN
2654 166162 : principal_units(GEN nf, GEN pr, long k, GEN prk)
2655 : {
2656 : GEN list, prb;
2657 166162 : ulong mask = quadratic_prec_mask(k);
2658 166162 : long a = 1;
2659 :
2660 166162 : prb = pr_hnf(nf,pr);
2661 166162 : list = vectrunc_init(k);
2662 401802 : while (mask > 1)
2663 : {
2664 235640 : GEN pra = prb;
2665 235640 : long b = a << 1;
2666 :
2667 235640 : if (mask & 1) b--;
2668 235640 : mask >>= 1;
2669 : /* compute 1 + pr^a / 1 + pr^b, 2a <= b */
2670 235640 : prb = (b >= k)? prk: idealpows(nf,pr,b);
2671 235640 : vectrunc_append(list, zidealij(pra, prb));
2672 235640 : a = b;
2673 : }
2674 166162 : return list;
2675 : }
2676 : /* a = 1 mod (pr) return log(a) on local-gens of 1+pr/1+pr^k */
2677 : static GEN
2678 1437884 : log_prk1(GEN nf, GEN a, long nh, GEN L2, GEN prk)
2679 : {
2680 1437884 : GEN y = cgetg(nh+1, t_COL);
2681 1437884 : long j, iy, c = lg(L2)-1;
2682 3810859 : for (j = iy = 1; j <= c; j++)
2683 : {
2684 2372981 : GEN L = gel(L2,j), cyc = gel(L,1), gen = gel(L,2), E = apply_U(L,a);
2685 2372981 : long i, nc = lg(cyc)-1;
2686 2372981 : int last = (j == c);
2687 6068750 : for (i = 1; i <= nc; i++, iy++)
2688 : {
2689 3695775 : GEN t, e = gel(E,i);
2690 3695775 : if (typ(e) != t_INT) pari_err_COPRIME("zlog_prk1", a, prk);
2691 3695769 : t = Fp_neg(e, gel(cyc,i));
2692 3695769 : gel(y,iy) = negi(t);
2693 3695769 : if (!last && signe(t)) a = nfmulpowmodideal(nf, a, gel(gen,i), t, prk);
2694 : }
2695 : }
2696 1437878 : return y;
2697 : }
2698 : /* true nf */
2699 : static GEN
2700 59868 : principal_units_relations(GEN nf, GEN L2, GEN prk, long nh)
2701 : {
2702 59868 : GEN h = cgetg(nh+1,t_MAT);
2703 59868 : long ih, j, c = lg(L2)-1;
2704 189214 : for (j = ih = 1; j <= c; j++)
2705 : {
2706 129346 : GEN L = gel(L2,j), F = gel(L,1), G = gel(L,2);
2707 129346 : long k, lG = lg(G);
2708 306970 : for (k = 1; k < lG; k++,ih++)
2709 : { /* log(g^f) mod pr^e */
2710 177624 : GEN a = nfpowmodideal(nf,gel(G,k),gel(F,k),prk);
2711 177624 : gel(h,ih) = ZC_neg(log_prk1(nf, a, nh, L2, prk));
2712 177624 : gcoeff(h,ih,ih) = gel(F,k);
2713 : }
2714 : }
2715 59868 : return h;
2716 : }
2717 : /* true nf; k > 1; multiplicative group (1 + pr) / (1 + pr^k) */
2718 : static GEN
2719 166162 : idealprincipalunits_i(GEN nf, GEN pr, long k, GEN *pU)
2720 : {
2721 166162 : GEN cyc, gen, L2, prk = idealpows(nf, pr, k);
2722 :
2723 166162 : L2 = principal_units(nf, pr, k, prk);
2724 166162 : if (k == 2)
2725 : {
2726 106294 : GEN L = gel(L2,1);
2727 106294 : cyc = gel(L,1);
2728 106294 : gen = gel(L,2);
2729 106294 : if (pU) *pU = matid(lg(gen)-1);
2730 : }
2731 : else
2732 : {
2733 59868 : long c = lg(L2), j;
2734 59868 : GEN EX, h, Ui, vg = cgetg(c, t_VEC);
2735 189214 : for (j = 1; j < c; j++) gel(vg, j) = gmael(L2,j,2);
2736 59868 : vg = shallowconcat1(vg);
2737 59868 : h = principal_units_relations(nf, L2, prk, lg(vg)-1);
2738 59868 : h = ZM_hnfall_i(h, NULL, 0);
2739 59868 : cyc = ZM_snf_group(h, pU, &Ui);
2740 59868 : c = lg(Ui); gen = cgetg(c, t_VEC); EX = cyc_get_expo(cyc);
2741 195700 : for (j = 1; j < c; j++)
2742 135832 : gel(gen,j) = famat_to_nf_modideal_coprime(nf, vg, gel(Ui,j), prk, EX);
2743 : }
2744 166162 : return mkvec4(cyc, gen, prk, L2);
2745 : }
2746 : GEN
2747 165 : idealprincipalunits(GEN nf, GEN pr, long k)
2748 : {
2749 : pari_sp av;
2750 : GEN v;
2751 165 : nf = checknf(nf);
2752 165 : if (k == 1) { checkprid(pr); retmkvec3(gen_1,cgetg(1,t_VEC),cgetg(1,t_VEC)); }
2753 159 : av = avma; v = idealprincipalunits_i(nf, pr, k, NULL);
2754 159 : return gc_GEN(av, mkvec3(powiu(pr_norm(pr), k-1), gel(v,1), gel(v,2)));
2755 : }
2756 :
2757 : /* true nf; given an ideal pr^k dividing an integral ideal x (in HNF form)
2758 : * compute an 'sprk', the structure of G = (Z_K/pr^k)^* [ x = NULL for x=pr^k ]
2759 : * Return a vector with at least 4 components [cyc],[gen],[HNF pr^k,pr,k],ff,
2760 : * where
2761 : * cyc : type of G as abelian group (SNF)
2762 : * gen : generators of G, coprime to x
2763 : * pr^k: in HNF
2764 : * ff : data for log_g in (Z_K/pr)^*
2765 : * Two extra components are present iff k > 1: L2, U
2766 : * L2 : list of data structures to compute local DL in (Z_K/pr)^*,
2767 : * and 1 + pr^a/ 1 + pr^b for various a < b <= min(2a, k)
2768 : * U : base change matrices to convert a vector of local DL to DL wrt gen
2769 : * If MOD is not NULL, initialize G / G^MOD instead */
2770 : static GEN
2771 398588 : sprkinit(GEN nf, GEN pr, long k, GEN x, GEN MOD)
2772 : {
2773 398588 : GEN T, p, Ld, modpr, cyc, gen, g, g0, A, prk, U, L2, ord0 = NULL;
2774 398588 : long f = pr_get_f(pr);
2775 :
2776 398588 : if(DEBUGLEVEL>3) err_printf("treating pr^%ld, pr = %Ps\n",k,pr);
2777 398588 : modpr = nf_to_Fq_init(nf, &pr,&T,&p);
2778 398588 : if (MOD)
2779 : {
2780 358228 : GEN o = subiu(powiu(p,f), 1), d = gcdii(o, MOD), fa = Z_factor(d);
2781 358228 : ord0 = mkvec2(o, fa); /* true order, factorization of order in G/G^MOD */
2782 358228 : Ld = gel(fa,1);
2783 358228 : if (lg(Ld) > 1 && equaliu(gel(Ld,1),2)) Ld = vecslice(Ld,2,lg(Ld)-1);
2784 : }
2785 : /* (Z_K / pr)^* */
2786 398588 : if (f == 1)
2787 : {
2788 321617 : g0 = g = MOD? pgener_Fp_local(p, Ld): pgener_Fp(p);
2789 321617 : if (!ord0) ord0 = get_arith_ZZM(subiu(p,1));
2790 : }
2791 : else
2792 : {
2793 76971 : g0 = g = MOD? gener_FpXQ_local(T, p, Ld): gener_FpXQ(T,p, &ord0);
2794 76971 : g = Fq_to_nf(g, modpr);
2795 76971 : if (typ(g) == t_POL) g = poltobasis(nf, g);
2796 : }
2797 398588 : A = gel(ord0, 1); /* Norm(pr)-1 */
2798 : /* If MOD != NULL, d = gcd(A, MOD): g^(A/d) has order d */
2799 398588 : if (k == 1)
2800 : {
2801 232585 : cyc = mkvec(A);
2802 232585 : gen = mkvec(g);
2803 232585 : prk = pr_hnf(nf,pr);
2804 232585 : L2 = U = NULL;
2805 : }
2806 : else
2807 : { /* local-gens of (1 + pr)/(1 + pr^k) = SNF-gens * U */
2808 : GEN AB, B, u, v, w;
2809 : long j, l;
2810 166003 : w = idealprincipalunits_i(nf, pr, k, &U);
2811 : /* incorporate (Z_K/pr)^*, order A coprime to B = expo(1+pr/1+pr^k)*/
2812 166003 : cyc = leafcopy(gel(w,1)); B = cyc_get_expo(cyc); AB = mulii(A,B);
2813 166003 : gen = leafcopy(gel(w,2));
2814 166003 : prk = gel(w,3);
2815 166003 : g = nfpowmodideal(nf, g, B, prk);
2816 166003 : g0 = Fq_pow(g0, modii(B,A), T, p); /* update primitive root */
2817 166003 : L2 = mkvec3(A, g, gel(w,4));
2818 166003 : gel(cyc,1) = AB;
2819 166003 : gel(gen,1) = nfmulmodideal(nf, gel(gen,1), g, prk);
2820 166003 : u = mulii(Fp_inv(A,B), A);
2821 166003 : v = subui(1, u); l = lg(U);
2822 487930 : for (j = 1; j < l; j++) gcoeff(U,1,j) = Fp_mul(u, gcoeff(U,1,j), AB);
2823 166003 : U = mkvec2(Rg_col_ei(v, lg(gen)-1, 1), U);
2824 : }
2825 : /* local-gens of (Z_K/pr^k)^* = SNF-gens * U */
2826 398588 : if (x)
2827 : {
2828 231284 : GEN uv = zkchineseinit(nf, idealmulpowprime(nf,x,pr,utoineg(k)), prk, x);
2829 231284 : gen = zkVchinese1(uv, gen);
2830 : }
2831 398588 : return mkvecn(U? 6: 4, cyc, gen, prk, mkvec3(modpr,g0,ord0), L2, U);
2832 : }
2833 : GEN
2834 3883955 : sprk_get_cyc(GEN s) { return gel(s,1); }
2835 : GEN
2836 1812069 : sprk_get_expo(GEN s) { return cyc_get_expo(sprk_get_cyc(s)); }
2837 : GEN
2838 316892 : sprk_get_gen(GEN s) { return gel(s,2); }
2839 : GEN
2840 4773496 : sprk_get_prk(GEN s) { return gel(s,3); }
2841 : GEN
2842 2580390 : sprk_get_ff(GEN s) { return gel(s,4); }
2843 : GEN
2844 2391599 : sprk_get_pr(GEN s) { GEN ff = gel(s,4); return modpr_get_pr(gel(ff,1)); }
2845 : /* L2 to 1 + pr / 1 + pr^k */
2846 : static GEN
2847 1323382 : sprk_get_L2(GEN s) { return gmael(s,5,3); }
2848 : /* lift to nf of primitive root of k(pr) */
2849 : static GEN
2850 272628 : sprk_get_gnf(GEN s) { return gmael(s,5,2); }
2851 : /* A = Npr-1, <g> = (Z_K/pr)^*, L2 to 1 + pr / 1 + pr^k */
2852 : void
2853 0 : sprk_get_AgL2(GEN s, GEN *A, GEN *g, GEN *L2)
2854 0 : { GEN v = gel(s,5); *A = gel(v,1); *g = gel(v,2); *L2 = gel(v,3); }
2855 : void
2856 1306304 : sprk_get_U2(GEN s, GEN *U1, GEN *U2)
2857 1306304 : { GEN v = gel(s,6); *U1 = gel(v,1); *U2 = gel(v,2); }
2858 : static int
2859 2580444 : sprk_is_prime(GEN s) { return lg(s) == 5; }
2860 :
2861 : GEN
2862 1811901 : famat_zlog_pr(GEN nf, GEN g, GEN e, GEN sprk, GEN mod)
2863 : {
2864 1811901 : GEN x, expo = sprk_get_expo(sprk);
2865 1811901 : if (mod) expo = gcdii(expo,mod);
2866 1811901 : x = famat_makecoprime(nf, g, e, sprk_get_pr(sprk), sprk_get_prk(sprk), expo);
2867 1811901 : return log_prk(nf, x, sprk, mod);
2868 : }
2869 : /* famat_zlog_pr assuming (g,sprk.pr) = 1 */
2870 : static GEN
2871 168 : famat_zlog_pr_coprime(GEN nf, GEN g, GEN e, GEN sprk, GEN MOD)
2872 : {
2873 168 : GEN x = famat_to_nf_modideal_coprime(nf, g, e, sprk_get_prk(sprk),
2874 : sprk_get_expo(sprk));
2875 168 : return log_prk(nf, x, sprk, MOD);
2876 : }
2877 :
2878 : /* o t_INT, O = [ord,fa] format for multiple of o (for Fq_log);
2879 : * return o in [ord,fa] format */
2880 : static GEN
2881 621599 : order_update(GEN o, GEN O)
2882 : {
2883 621599 : GEN p = gmael(O,2,1), z = o, P, E;
2884 621599 : long i, j, l = lg(p);
2885 621599 : P = cgetg(l, t_COL);
2886 621599 : E = cgetg(l, t_COL);
2887 665887 : for (i = j = 1; i < l; i++)
2888 : {
2889 665887 : long v = Z_pvalrem(z, gel(p,i), &z);
2890 665887 : if (v)
2891 : {
2892 654767 : gel(P,j) = gel(p,i);
2893 654767 : gel(E,j) = utoipos(v); j++;
2894 654767 : if (is_pm1(z)) break;
2895 : }
2896 : }
2897 621599 : setlg(P, j);
2898 621599 : setlg(E, j); return mkvec2(o, mkmat2(P,E));
2899 : }
2900 :
2901 : /* a in Z_K (t_COL or t_INT), pr prime ideal, sprk = sprkinit(nf,pr,k,x),
2902 : * mod positive t_INT or NULL (meaning mod=0).
2903 : * return log(a) modulo mod on SNF-generators of (Z_K/pr^k)^* */
2904 : GEN
2905 2651070 : log_prk(GEN nf, GEN a, GEN sprk, GEN mod)
2906 : {
2907 : GEN e, prk, g, U1, U2, y, ff, O, o, oN, gN, N, T, p, modpr, pr, cyc;
2908 :
2909 2651070 : if (typ(a) == t_MAT) return famat_zlog_pr(nf, gel(a,1), gel(a,2), sprk, mod);
2910 2580390 : N = NULL;
2911 2580390 : ff = sprk_get_ff(sprk);
2912 2580390 : pr = gel(ff,1); /* modpr */
2913 2580390 : g = gN = gel(ff,2);
2914 2580390 : O = gel(ff,3); /* order of g = |Fq^*|, in [ord, fa] format */
2915 2580390 : o = oN = gel(O,1); /* order as a t_INT */
2916 2580390 : prk = sprk_get_prk(sprk);
2917 2580390 : modpr = nf_to_Fq_init(nf, &pr, &T, &p);
2918 2580390 : if (mod)
2919 : {
2920 2137131 : GEN d = gcdii(o,mod);
2921 2137131 : if (!equalii(o, d))
2922 : {
2923 798859 : N = diviiexact(o,d); /* > 1, coprime to p */
2924 798859 : a = nfpowmodideal(nf, a, N, prk);
2925 798859 : oN = d; /* order of g^N mod pr */
2926 : }
2927 : }
2928 2580390 : if (equali1(oN))
2929 580604 : e = gen_0;
2930 : else
2931 : {
2932 1999786 : if (N) { O = order_update(oN, O); gN = Fq_pow(g, N, T, p); }
2933 1999786 : e = Fq_log(nf_to_Fq(nf,a,modpr), gN, O, T, p);
2934 : }
2935 : /* 0 <= e < oN is correct modulo oN */
2936 2580390 : if (sprk_is_prime(sprk)) return mkcol(e); /* k = 1 */
2937 :
2938 925459 : sprk_get_U2(sprk, &U1,&U2);
2939 925459 : cyc = sprk_get_cyc(sprk);
2940 925459 : if (mod)
2941 : {
2942 562759 : cyc = ZV_snf_gcd(cyc, mod);
2943 562759 : if (signe(remii(mod,p))) return ZV_ZV_mod(ZC_Z_mul(U1,e), cyc);
2944 : }
2945 879415 : if (signe(e))
2946 : {
2947 272628 : GEN E = N? mulii(e, N): e;
2948 272628 : a = nfmulpowmodideal(nf, a, sprk_get_gnf(sprk), Fp_neg(E, o), prk);
2949 : }
2950 : /* a = 1 mod pr */
2951 879415 : y = log_prk1(nf, a, lg(U2)-1, sprk_get_L2(sprk), prk);
2952 879409 : if (N)
2953 : { /* from DL(a^N) to DL(a) */
2954 129640 : GEN E = gel(sprk_get_cyc(sprk), 1), q = powiu(p, Z_pval(E, p));
2955 129640 : y = ZC_Z_mul(y, Fp_inv(N, q));
2956 : }
2957 879409 : y = ZC_lincomb(gen_1, e, ZM_ZC_mul(U2,y), U1);
2958 879409 : return ZV_ZV_mod(y, cyc);
2959 : }
2960 : /* true nf */
2961 : GEN
2962 81750 : log_prk_init(GEN nf, GEN pr, long k, GEN MOD)
2963 81750 : { return sprkinit(nf,pr,k,NULL,MOD);}
2964 : GEN
2965 426 : veclog_prk(GEN nf, GEN v, GEN sprk)
2966 : {
2967 426 : long l = lg(v), i;
2968 426 : GEN w = cgetg(l, t_MAT);
2969 1056 : for (i = 1; i < l; i++) gel(w,i) = log_prk(nf, gel(v,i), sprk, NULL);
2970 426 : return w;
2971 : }
2972 :
2973 : static GEN
2974 1199005 : famat_zlog(GEN nf, GEN fa, GEN sgn, zlog_S *S)
2975 : {
2976 1199005 : long i, l0, l = lg(S->U);
2977 1199005 : GEN g = gel(fa,1), e = gel(fa,2), y = cgetg(l, t_COL);
2978 1199005 : l0 = lg(S->sprk); /* = l (trivial arch. part), or l-1 */
2979 2580490 : for (i=1; i < l0; i++) gel(y,i) = famat_zlog_pr(nf, g, e, gel(S->sprk,i), S->mod);
2980 1199005 : if (l0 != l)
2981 : {
2982 178314 : if (!sgn) sgn = nfsign_arch(nf, fa, S->archp);
2983 178314 : gel(y,l0) = Flc_to_ZC(sgn);
2984 : }
2985 1199005 : return y;
2986 : }
2987 :
2988 : /* assume that cyclic factors are normalized, in particular != [1] */
2989 : static GEN
2990 231251 : split_U(GEN U, GEN Sprk)
2991 : {
2992 231251 : long t = 0, k, n, l = lg(Sprk);
2993 231251 : GEN vU = cgetg(l+1, t_VEC);
2994 547565 : for (k = 1; k < l; k++)
2995 : {
2996 316314 : n = lg(sprk_get_cyc(gel(Sprk,k))) - 1; /* > 0 */
2997 316314 : gel(vU,k) = vecslice(U, t+1, t+n);
2998 316314 : t += n;
2999 : }
3000 : /* t+1 .. lg(U)-1 */
3001 231251 : n = lg(U) - t - 1; /* can be 0 */
3002 231251 : if (!n) setlg(vU,l); else gel(vU,l) = vecslice(U, t+1, t+n);
3003 231251 : return vU;
3004 : }
3005 :
3006 : static void
3007 1825191 : init_zlog_mod(zlog_S *S, GEN bid, GEN mod)
3008 : {
3009 1825191 : GEN fa2 = bid_get_fact2(bid), MOD = bid_get_MOD(bid);
3010 1825191 : S->U = bid_get_U(bid);
3011 1825191 : S->hU = lg(bid_get_cyc(bid))-1;
3012 1825191 : S->archp = bid_get_archp(bid);
3013 1825191 : S->sprk = bid_get_sprk(bid);
3014 1825191 : S->bid = bid;
3015 1825191 : if (MOD) mod = mod? gcdii(mod, MOD): MOD;
3016 1825191 : S->mod = mod;
3017 1825191 : S->P = gel(fa2,1);
3018 1825191 : S->k = gel(fa2,2);
3019 1825191 : S->no2 = lg(S->P) == lg(gel(bid_get_fact(bid),1));
3020 1825191 : }
3021 : void
3022 338410 : init_zlog(zlog_S *S, GEN bid)
3023 : {
3024 338410 : return init_zlog_mod(S, bid, NULL);
3025 : }
3026 :
3027 : /* a a t_FRAC/t_INT, reduce mod bid */
3028 : static GEN
3029 12 : Q_mod_bid(GEN bid, GEN a)
3030 : {
3031 12 : GEN xZ = gcoeff(bid_get_ideal(bid),1,1);
3032 12 : GEN b = Rg_to_Fp(a, xZ);
3033 12 : if (gsigne(a) < 0) b = subii(b, xZ);
3034 12 : return signe(b)? b: xZ;
3035 : }
3036 : /* Return decomposition of a on the CRT generators blocks attached to the
3037 : * S->sprk and sarch; sgn = sign(a, S->arch), NULL if unknown */
3038 : static GEN
3039 423197 : zlog(GEN nf, GEN a, GEN sgn, zlog_S *S)
3040 : {
3041 : long k, l;
3042 : GEN y;
3043 423197 : a = nf_to_scalar_or_basis(nf, a);
3044 423197 : switch(typ(a))
3045 : {
3046 158020 : case t_INT: break;
3047 12 : case t_FRAC: a = Q_mod_bid(S->bid, a); break;
3048 265165 : default: /* case t_COL: */
3049 : {
3050 : GEN den;
3051 265165 : a = Q_remove_denom(a, &den);
3052 265165 : if (den)
3053 : {
3054 70 : a = mkmat2(mkcol2(a, den), mkcol2(gen_1, gen_m1));
3055 70 : return famat_zlog(nf, a, sgn, S);
3056 : }
3057 : }
3058 : }
3059 423127 : if (sgn)
3060 342470 : sgn = (lg(sgn) == 1)? NULL: leafcopy(sgn);
3061 : else
3062 80657 : sgn = (lg(S->archp) == 1)? NULL: nfsign_arch(nf, a, S->archp);
3063 423127 : l = lg(S->sprk);
3064 423127 : y = cgetg(sgn? l+1: l, t_COL);
3065 1154763 : for (k = 1; k < l; k++)
3066 : {
3067 731642 : GEN sprk = gel(S->sprk,k);
3068 731642 : gel(y,k) = log_prk(nf, a, sprk, S->mod);
3069 : }
3070 423121 : if (sgn) gel(y,l) = Flc_to_ZC(sgn);
3071 423121 : return y;
3072 : }
3073 :
3074 : /* true nf */
3075 : GEN
3076 61716 : pr_basis_perm(GEN nf, GEN pr)
3077 : {
3078 61716 : long f = pr_get_f(pr);
3079 : GEN perm;
3080 61716 : if (f == nf_get_degree(nf)) return identity_perm(f);
3081 53146 : perm = cgetg(f+1, t_VECSMALL);
3082 53146 : perm[1] = 1;
3083 53146 : if (f > 1)
3084 : {
3085 2759 : GEN H = pr_hnf(nf,pr);
3086 : long i, k;
3087 9754 : for (i = k = 2; k <= f; i++)
3088 6995 : if (!equali1(gcoeff(H,i,i))) perm[k++] = i;
3089 : }
3090 53146 : return perm;
3091 : }
3092 :
3093 : /* \sum U[i]*y[i], U[i] ZM, y[i] ZC. We allow lg(y) > lg(U). */
3094 : static GEN
3095 1622210 : ZMV_ZCV_mul(GEN U, GEN y)
3096 : {
3097 1622210 : long i, l = lg(U);
3098 1622210 : GEN z = NULL;
3099 1622210 : if (l == 1) return cgetg(1,t_COL);
3100 4140488 : for (i = 1; i < l; i++)
3101 : {
3102 2518278 : GEN u = ZM_ZC_mul(gel(U,i), gel(y,i));
3103 2518278 : z = z? ZC_add(z, u): u;
3104 : }
3105 1622210 : return z;
3106 : }
3107 : /* A * (x[1], ..., x[d] */
3108 : static GEN
3109 444 : ZM_ZMV_mul(GEN A, GEN x)
3110 906 : { pari_APPLY_same(ZM_mul(A,gel(x,i))); }
3111 :
3112 : /* a = 1 mod pr, sprk mod pr^e, e >= 1 */
3113 : static GEN
3114 380845 : sprk_log_prk1_2(GEN nf, GEN a, GEN sprk)
3115 : {
3116 380845 : GEN U1, U2, y, L2 = sprk_get_L2(sprk);
3117 380845 : sprk_get_U2(sprk, &U1,&U2);
3118 380845 : y = ZM_ZC_mul(U2, log_prk1(nf, a, lg(U2)-1, L2, sprk_get_prk(sprk)));
3119 380845 : return ZV_ZV_mod(y, sprk_get_cyc(sprk));
3120 : }
3121 : /* true nf; assume e >= 2 */
3122 : GEN
3123 124622 : sprk_log_gen_pr2(GEN nf, GEN sprk, long e)
3124 : {
3125 124622 : GEN M, G, pr = sprk_get_pr(sprk);
3126 : long i, l;
3127 124622 : if (e == 2)
3128 : {
3129 63122 : GEN L2 = sprk_get_L2(sprk), L = gel(L2,1);
3130 63122 : G = gel(L,2); l = lg(G);
3131 : }
3132 : else
3133 : {
3134 61500 : GEN perm = pr_basis_perm(nf,pr), PI = nfpow_u(nf, pr_get_gen(pr), e-1);
3135 61500 : l = lg(perm);
3136 61500 : G = cgetg(l, t_VEC);
3137 61500 : if (typ(PI) == t_INT)
3138 : { /* zk_ei_mul doesn't allow t_INT */
3139 8564 : long N = nf_get_degree(nf);
3140 8564 : gel(G,1) = addiu(PI,1);
3141 11134 : for (i = 2; i < l; i++)
3142 : {
3143 2570 : GEN z = col_ei(N, 1);
3144 2570 : gel(G,i) = z; gel(z, perm[i]) = PI;
3145 : }
3146 : }
3147 : else
3148 : {
3149 52936 : gel(G,1) = nfadd(nf, gen_1, PI);
3150 59010 : for (i = 2; i < l; i++)
3151 6074 : gel(G,i) = nfadd(nf, gen_1, zk_ei_mul(nf, PI, perm[i]));
3152 : }
3153 : }
3154 124622 : M = cgetg(l, t_MAT);
3155 269019 : for (i = 1; i < l; i++) gel(M,i) = sprk_log_prk1_2(nf, gel(G,i), sprk);
3156 124622 : return M;
3157 : }
3158 : /* Log on bid.gen of generators of P_{1,I pr^{e-1}} / P_{1,I pr^e} (I,pr) = 1,
3159 : * defined implicitly via CRT. 'ind' is the index of pr in modulus
3160 : * factorization; true nf */
3161 : GEN
3162 413904 : log_gen_pr(zlog_S *S, long ind, GEN nf, long e)
3163 : {
3164 413904 : GEN Uind = gel(S->U, ind);
3165 413904 : if (e == 1) retmkmat( gel(Uind,1) );
3166 122306 : return ZM_mul(Uind, sprk_log_gen_pr2(nf, gel(S->sprk,ind), e));
3167 : }
3168 : /* true nf */
3169 : GEN
3170 1746 : sprk_log_gen_pr(GEN nf, GEN sprk, long e)
3171 : {
3172 1746 : if (e == 1)
3173 : {
3174 0 : long n = lg(sprk_get_cyc(sprk))-1;
3175 0 : retmkmat(col_ei(n, 1));
3176 : }
3177 1746 : return sprk_log_gen_pr2(nf, sprk, e);
3178 : }
3179 : /* a = 1 mod pr */
3180 : GEN
3181 236448 : sprk_log_prk1(GEN nf, GEN a, GEN sprk)
3182 : {
3183 236448 : if (lg(sprk) == 5) return mkcol(gen_0); /* mod pr */
3184 236448 : return sprk_log_prk1_2(nf, a, sprk);
3185 : }
3186 : /* Log on bid.gen of generator of P_{1,f} / P_{1,f v[index]}
3187 : * v = vector of r1 real places */
3188 : GEN
3189 95059 : log_gen_arch(zlog_S *S, long index) { return gel(veclast(S->U), index); }
3190 :
3191 : /* compute bid.clgp: [h,cyc] or [h,cyc,gen] */
3192 : static GEN
3193 232063 : bid_grp(GEN nf, GEN U, GEN cyc, GEN g, GEN F, GEN sarch)
3194 : {
3195 232063 : GEN G, h = ZV_prod(cyc);
3196 : long c;
3197 232063 : if (!U) return mkvec2(h,cyc);
3198 231757 : c = lg(U);
3199 231757 : G = cgetg(c,t_VEC);
3200 231757 : if (c > 1)
3201 : {
3202 206027 : GEN U0, Uoo, EX = cyc_get_expo(cyc); /* exponent of bid */
3203 206027 : long i, hU = nbrows(U), nba = lg(sarch_get_cyc(sarch))-1; /* #f_oo */
3204 206027 : if (!nba) { U0 = U; Uoo = NULL; }
3205 77264 : else if (nba == hU) { U0 = NULL; Uoo = U; }
3206 : else
3207 : {
3208 69516 : U0 = rowslice(U, 1, hU-nba);
3209 69516 : Uoo = rowslice(U, hU-nba+1, hU);
3210 : }
3211 659534 : for (i = 1; i < c; i++)
3212 : {
3213 453507 : GEN t = gen_1;
3214 453507 : if (U0) t = famat_to_nf_modideal_coprime(nf, g, gel(U0,i), F, EX);
3215 453507 : if (Uoo) t = set_sign_mod_divisor(nf, ZV_to_Flv(gel(Uoo,i),2), t, sarch);
3216 453507 : gel(G,i) = t;
3217 : }
3218 : }
3219 231757 : return mkvec3(h, cyc, G);
3220 : }
3221 :
3222 : /* remove prime ideals of norm 2 with exponent 1 from factorization */
3223 : static GEN
3224 232345 : famat_strip2(GEN fa)
3225 : {
3226 232345 : GEN P = gel(fa,1), E = gel(fa,2), Q, F;
3227 232345 : long l = lg(P), i, j;
3228 232345 : Q = cgetg(l, t_COL);
3229 232345 : F = cgetg(l, t_COL);
3230 582894 : for (i = j = 1; i < l; i++)
3231 : {
3232 350549 : GEN pr = gel(P,i), e = gel(E,i);
3233 350549 : if (!absequaliu(pr_get_p(pr), 2) || itou(e) != 1 || pr_get_f(pr) != 1)
3234 : {
3235 317426 : gel(Q,j) = pr;
3236 317426 : gel(F,j) = e; j++;
3237 : }
3238 : }
3239 232345 : setlg(Q,j);
3240 232345 : setlg(F,j); return mkmat2(Q,F);
3241 : }
3242 : static int
3243 114936 : checkarchp(GEN v, long r1)
3244 : {
3245 114936 : long i, l = lg(v);
3246 114936 : pari_sp av = avma;
3247 : GEN p;
3248 114936 : if (l == 1) return 1;
3249 40418 : if (l == 2) return v[1] > 0 && v[1] <= r1;
3250 18868 : p = zero_zv(r1);
3251 56671 : for (i = 1; i < l; i++)
3252 : {
3253 37833 : long j = v[i];
3254 37833 : if (j <= 0 || j > r1 || p[j]) return gc_long(av, 0);
3255 37803 : p[j] = 1;
3256 : }
3257 18838 : return gc_long(av, 1);
3258 : }
3259 :
3260 : /* True nf. Put ideal to form [[ideal,arch]] and set fa and fa2 to its
3261 : * factorization, archp to the indices of arch places */
3262 : GEN
3263 232345 : check_mod_factored(GEN nf, GEN ideal, GEN *fa_, GEN *fa2_, GEN *archp_, GEN MOD)
3264 : {
3265 : GEN arch, x, fa, fa2, archp;
3266 : long R1;
3267 :
3268 232345 : R1 = nf_get_r1(nf);
3269 232345 : if (typ(ideal) == t_VEC && lg(ideal) == 3)
3270 : {
3271 163802 : arch = gel(ideal,2);
3272 163802 : ideal= gel(ideal,1);
3273 163802 : switch(typ(arch))
3274 : {
3275 48866 : case t_VEC:
3276 48866 : if (lg(arch) != R1+1)
3277 6 : pari_err_TYPE("Idealstar [incorrect archimedean component]",arch);
3278 48860 : archp = vec01_to_indices(arch);
3279 48860 : break;
3280 114936 : case t_VECSMALL:
3281 114936 : if (!checkarchp(arch, R1))
3282 30 : pari_err_TYPE("Idealstar [incorrect archimedean component]",arch);
3283 114906 : archp = arch;
3284 114906 : arch = indices_to_vec01(archp, R1);
3285 114906 : break;
3286 0 : default:
3287 0 : pari_err_TYPE("Idealstar [incorrect archimedean component]",arch);
3288 : return NULL;/*LCOV_EXCL_LINE*/
3289 : }
3290 : }
3291 : else
3292 : {
3293 68543 : arch = zerovec(R1);
3294 68543 : archp = cgetg(1, t_VECSMALL);
3295 : }
3296 232309 : if (MOD)
3297 : {
3298 194628 : if (typ(MOD) != t_INT) pari_err_TYPE("bnrinit [incorrect cycmod]", MOD);
3299 194628 : if (mpodd(MOD) && lg(archp) != 1)
3300 197 : MOD = shifti(MOD, 1); /* ensure elements of G^MOD are >> 0 */
3301 : }
3302 232309 : if (is_nf_factor(ideal))
3303 : {
3304 45521 : fa = ideal;
3305 45521 : x = factorbackprime(nf, gel(fa,1), gel(fa,2));
3306 : }
3307 : else
3308 : {
3309 186788 : fa = idealfactor(nf, ideal);
3310 186776 : x = ideal;
3311 : }
3312 232297 : if (typ(x) != t_MAT) x = idealhnf_shallow(nf, x);
3313 232297 : if (lg(x) == 1) pari_err_DOMAIN("Idealstar", "ideal","=",gen_0,x);
3314 232297 : if (typ(gcoeff(x,1,1)) != t_INT)
3315 6 : pari_err_DOMAIN("Idealstar","denominator(ideal)", "!=",gen_1,x);
3316 :
3317 232291 : fa2 = famat_strip2(fa);
3318 232291 : if (fa_ != NULL) *fa_ = fa;
3319 232291 : if (fa2_ != NULL) *fa2_ = fa2;
3320 232291 : if (fa2_ != NULL) *archp_ = archp;
3321 232291 : return mkvec2(x, arch);
3322 : }
3323 :
3324 : /* True nf. Compute [[ideal,arch], [h,[cyc],[gen]], idealfact, [liste], U]
3325 : flag may include nf_GEN | nf_INIT */
3326 : static GEN
3327 231793 : Idealstarmod_i(GEN nf, GEN ideal, long flag, GEN MOD)
3328 : {
3329 : long i, nbp;
3330 231793 : GEN y, cyc, U, u1 = NULL, fa, fa2, sprk, x_arch, x, arch, archp, E, P, sarch, gen;
3331 :
3332 231793 : x_arch = check_mod_factored(nf, ideal, &fa, &fa2, &archp, MOD);
3333 231751 : x = gel(x_arch, 1);
3334 231751 : arch = gel(x_arch, 2);
3335 :
3336 231751 : sarch = nfarchstar(nf, x, archp);
3337 231751 : P = gel(fa2,1);
3338 231751 : E = gel(fa2,2);
3339 231751 : nbp = lg(P)-1;
3340 231751 : sprk = cgetg(nbp+1,t_VEC);
3341 231751 : if (nbp)
3342 : {
3343 198237 : GEN t = (lg(gel(fa,1))==2)? NULL: x; /* beware fa != fa2 */
3344 198237 : cyc = cgetg(nbp+2,t_VEC);
3345 198237 : gen = cgetg(nbp+1,t_VEC);
3346 515075 : for (i = 1; i <= nbp; i++)
3347 : {
3348 316838 : GEN L = sprkinit(nf, gel(P,i), itou(gel(E,i)), t, MOD);
3349 316838 : gel(sprk,i) = L;
3350 316838 : gel(cyc,i) = sprk_get_cyc(L);
3351 : /* true gens are congruent to those mod x AND positive at archp */
3352 316838 : gel(gen,i) = sprk_get_gen(L);
3353 : }
3354 198237 : gel(cyc,i) = sarch_get_cyc(sarch);
3355 198237 : cyc = shallowconcat1(cyc);
3356 198237 : gen = shallowconcat1(gen);
3357 198237 : cyc = ZV_snf_group(cyc, &U, (flag & nf_GEN)? &u1: NULL);
3358 : }
3359 : else
3360 : {
3361 33514 : cyc = sarch_get_cyc(sarch);
3362 33514 : gen = cgetg(1,t_VEC);
3363 33514 : U = matid(lg(cyc)-1);
3364 33514 : if (flag & nf_GEN) u1 = U;
3365 : }
3366 231751 : if (MOD) cyc = ZV_snf_gcd(cyc, MOD);
3367 231751 : y = bid_grp(nf, u1, cyc, gen, x, sarch);
3368 231751 : if (!(flag & nf_INIT)) return y;
3369 231161 : U = split_U(U, sprk);
3370 462322 : return mkvec5(mkvec2(x, arch), y, mkvec2(fa,fa2),
3371 231161 : MOD? mkvec3(sprk, sarch, MOD): mkvec2(sprk, sarch),
3372 : U);
3373 : }
3374 :
3375 : static long
3376 54 : idealHNF_norm_pval(GEN x, GEN p)
3377 : {
3378 54 : long i, v = 0, l = lg(x);
3379 150 : for (i = 1; i < l; i++) v += Z_pval(gcoeff(x,i,i), p);
3380 54 : return v;
3381 : }
3382 : static long
3383 54 : sprk_get_k(GEN sprk)
3384 : {
3385 : GEN pr, prk;
3386 54 : if (sprk_is_prime(sprk)) return 1;
3387 54 : pr = sprk_get_pr(sprk);
3388 54 : prk = sprk_get_prk(sprk);
3389 54 : return idealHNF_norm_pval(prk, pr_get_p(pr)) / pr_get_f(pr);
3390 : }
3391 : /* true nf, L a sprk */
3392 : GEN
3393 54 : sprk_to_bid(GEN nf, GEN L, long flag)
3394 : {
3395 54 : GEN y, cyc, U, u1 = NULL, fa, fa2, arch, sarch, gen, sprk;
3396 :
3397 54 : arch = zerovec(nf_get_r1(nf));
3398 54 : fa = to_famat_shallow(sprk_get_pr(L), utoipos(sprk_get_k(L)));
3399 54 : sarch = nfarchstar(nf, NULL, cgetg(1, t_VECSMALL));
3400 54 : fa2 = famat_strip2(fa);
3401 54 : sprk = mkvec(L);
3402 54 : cyc = shallowconcat(sprk_get_cyc(L), sarch_get_cyc(sarch));
3403 54 : gen = sprk_get_gen(L);
3404 54 : cyc = ZV_snf_group(cyc, &U, (flag & nf_GEN)? &u1: NULL);
3405 54 : y = bid_grp(nf, u1, cyc, gen, NULL, sarch);
3406 54 : if (!(flag & nf_INIT)) return y;
3407 54 : return mkvec5(mkvec2(sprk_get_prk(L), arch), y, mkvec2(fa,fa2),
3408 : mkvec2(sprk, sarch), split_U(U, sprk));
3409 : }
3410 : GEN
3411 231559 : Idealstarmod(GEN nf, GEN ideal, long flag, GEN MOD)
3412 : {
3413 231559 : pari_sp av = avma;
3414 231559 : nf = nf? checknf(nf): nfinit(pol_x(0), DEFAULTPREC);
3415 231559 : return gc_GEN(av, Idealstarmod_i(nf, ideal, flag, MOD));
3416 : }
3417 : GEN
3418 710 : Idealstar(GEN nf, GEN ideal, long flag) { return Idealstarmod(nf, ideal, flag, NULL); }
3419 : GEN
3420 234 : Idealstarprk(GEN nf, GEN pr, long k, long flag)
3421 : {
3422 234 : pari_sp av = avma;
3423 234 : GEN z = Idealstarmod_i(nf, mkmat2(mkcol(pr),mkcols(k)), flag, NULL);
3424 234 : return gc_GEN(av, z);
3425 : }
3426 :
3427 : /* FIXME: obsolete */
3428 : GEN
3429 0 : zidealstarinitgen(GEN nf, GEN ideal)
3430 0 : { return Idealstar(nf,ideal, nf_INIT|nf_GEN); }
3431 : GEN
3432 0 : zidealstarinit(GEN nf, GEN ideal)
3433 0 : { return Idealstar(nf,ideal, nf_INIT); }
3434 : GEN
3435 0 : zidealstar(GEN nf, GEN ideal)
3436 0 : { return Idealstar(nf,ideal, nf_GEN); }
3437 :
3438 : GEN
3439 96 : idealstarmod(GEN nf, GEN ideal, long flag, GEN MOD)
3440 : {
3441 96 : switch(flag)
3442 : {
3443 0 : case 0: return Idealstarmod(nf,ideal, nf_GEN, MOD);
3444 84 : case 1: return Idealstarmod(nf,ideal, nf_INIT, MOD);
3445 12 : case 2: return Idealstarmod(nf,ideal, nf_INIT|nf_GEN, MOD);
3446 0 : default: pari_err_FLAG("idealstar");
3447 : }
3448 : return NULL; /* LCOV_EXCL_LINE */
3449 : }
3450 : GEN
3451 0 : idealstar0(GEN nf, GEN ideal,long flag) { return idealstarmod(nf, ideal, flag, NULL); }
3452 :
3453 : GEN
3454 1983296 : ZV_snf_gcd(GEN x, GEN mod)
3455 4698009 : { pari_APPLY_same(gcdii(gel(x,i), mod)); }
3456 :
3457 : /* assume a true bnf and bid */
3458 : GEN
3459 205217 : ideallog_units0(GEN bnf, GEN bid, GEN MOD)
3460 : {
3461 205217 : GEN nf = bnf_get_nf(bnf), D, y, C, cyc;
3462 205217 : long j, lU = lg(bnf_get_logfu(bnf)); /* r1+r2 */
3463 : zlog_S S;
3464 205217 : init_zlog_mod(&S, bid, MOD);
3465 205217 : if (!S.hU) return zeromat(0,lU);
3466 205217 : cyc = bid_get_cyc(bid);
3467 205217 : D = nfsign_fu(bnf, bid_get_archp(bid));
3468 205217 : y = cgetg(lU, t_MAT);
3469 205217 : if ((C = bnf_build_cheapfu(bnf)))
3470 342428 : { for (j = 1; j < lU; j++) gel(y,j) = zlog(nf, gel(C,j), gel(D,j), &S); }
3471 : else
3472 : {
3473 42 : long i, l = lg(S.U), l0 = lg(S.sprk);
3474 : GEN X, U;
3475 42 : if (!(C = bnf_compactfu_mat(bnf))) bnf_build_units(bnf); /* error */
3476 42 : X = gel(C,1); U = gel(C,2);
3477 126 : for (j = 1; j < lU; j++) gel(y,j) = cgetg(l, t_COL);
3478 108 : for (i = 1; i < l0; i++)
3479 : {
3480 66 : GEN sprk = gel(S.sprk, i);
3481 66 : GEN Xi = sunits_makecoprime(X, sprk_get_pr(sprk), sprk_get_prk(sprk));
3482 198 : for (j = 1; j < lU; j++)
3483 132 : gcoeff(y,i,j) = famat_zlog_pr_coprime(nf, Xi, gel(U,j), sprk, MOD);
3484 : }
3485 42 : if (l0 != l)
3486 48 : for (j = 1; j < lU; j++) gcoeff(y,l0,j) = Flc_to_ZC(gel(D,j));
3487 : }
3488 205217 : y = vec_prepend(y, zlog(nf, bnf_get_tuU(bnf), nfsign_tu(bnf, S.archp), &S));
3489 547771 : for (j = 1; j <= lU; j++)
3490 342554 : gel(y,j) = ZV_ZV_mod(ZMV_ZCV_mul(S.U, gel(y,j)), cyc);
3491 205217 : return y;
3492 : }
3493 : GEN
3494 72 : ideallog_units(GEN bnf, GEN bid)
3495 72 : { return ideallog_units0(bnf, bid, NULL); }
3496 : GEN
3497 444 : log_prk_units(GEN nf, GEN D, GEN sprk)
3498 : {
3499 444 : GEN L, Ltu = log_prk(nf, gel(D,1), sprk, NULL);
3500 444 : D = gel(D,2);
3501 444 : if (lg(D) != 3 || typ(gel(D,2)) != t_MAT) L = veclog_prk(nf, D, sprk);
3502 : else
3503 : {
3504 18 : GEN X = gel(D,1), U = gel(D,2);
3505 18 : long j, lU = lg(U);
3506 18 : X = sunits_makecoprime(X, sprk_get_pr(sprk), sprk_get_prk(sprk));
3507 18 : L = cgetg(lU, t_MAT);
3508 54 : for (j = 1; j < lU; j++)
3509 36 : gel(L,j) = famat_zlog_pr_coprime(nf, X, gel(U,j), sprk, NULL);
3510 : }
3511 444 : return vec_prepend(L, Ltu);
3512 : }
3513 :
3514 : static GEN
3515 1281564 : ideallog_i(GEN nf, GEN x, zlog_S *S)
3516 : {
3517 1281564 : pari_sp av = avma;
3518 : GEN y;
3519 1281564 : if (!S->hU) return cgetg(1, t_COL);
3520 1279662 : if (typ(x) == t_MAT)
3521 1198935 : y = famat_zlog(nf, x, NULL, S);
3522 : else
3523 80727 : y = zlog(nf, x, NULL, S);
3524 1279656 : y = ZMV_ZCV_mul(S->U, y);
3525 1279656 : return gc_upto(av, ZV_ZV_mod(y, bid_get_cyc(S->bid)));
3526 : }
3527 : GEN
3528 1287287 : ideallogmod(GEN nf, GEN x, GEN bid, GEN mod)
3529 : {
3530 : zlog_S S;
3531 1287287 : if (!nf)
3532 : {
3533 5717 : if (mod) pari_err_IMPL("Zideallogmod");
3534 5717 : return Zideallog(bid, x);
3535 : }
3536 1281570 : checkbid(bid); init_zlog_mod(&S, bid, mod);
3537 1281564 : return ideallog_i(checknf(nf), x, &S);
3538 : }
3539 : GEN
3540 11801 : ideallog(GEN nf, GEN x, GEN bid) { return ideallogmod(nf, x, bid, NULL); }
3541 :
3542 : /*************************************************************************/
3543 : /** **/
3544 : /** JOIN BID STRUCTURES, IDEAL LISTS **/
3545 : /** **/
3546 : /*************************************************************************/
3547 : /* bid1, bid2: for coprime modules m1 and m2 (without arch. part).
3548 : * Output: bid for m1 m2 */
3549 : static GEN
3550 402 : join_bid(GEN nf, GEN bid1, GEN bid2)
3551 : {
3552 402 : pari_sp av = avma;
3553 : long nbgen, l1,l2;
3554 : GEN I1,I2, G1,G2, sprk1,sprk2, cyc1,cyc2, sarch;
3555 402 : GEN sprk, fa,fa2, U, cyc, y, u1 = NULL, x, gen;
3556 :
3557 402 : I1 = bid_get_ideal(bid1);
3558 402 : I2 = bid_get_ideal(bid2);
3559 402 : if (gequal1(gcoeff(I1,1,1))) return bid2; /* frequent trivial case */
3560 222 : G1 = bid_get_grp(bid1);
3561 222 : G2 = bid_get_grp(bid2);
3562 222 : x = idealmul(nf, I1,I2);
3563 222 : fa = famat_mul_shallow(bid_get_fact(bid1), bid_get_fact(bid2));
3564 222 : fa2= famat_mul_shallow(bid_get_fact2(bid1), bid_get_fact2(bid2));
3565 222 : sprk1 = bid_get_sprk(bid1);
3566 222 : sprk2 = bid_get_sprk(bid2);
3567 222 : sprk = shallowconcat(sprk1, sprk2);
3568 :
3569 222 : cyc1 = abgrp_get_cyc(G1); l1 = lg(cyc1);
3570 222 : cyc2 = abgrp_get_cyc(G2); l2 = lg(cyc2);
3571 222 : gen = (lg(G1)>3 && lg(G2)>3)? gen_1: NULL;
3572 222 : nbgen = l1+l2-2;
3573 222 : cyc = ZV_snf_group(shallowconcat(cyc1,cyc2), &U, gen? &u1: NULL);
3574 222 : if (nbgen)
3575 : {
3576 222 : GEN U1 = bid_get_U(bid1), U2 = bid_get_U(bid2);
3577 0 : U1 = l1==1? const_vec(lg(sprk1), cgetg(1,t_MAT))
3578 222 : : ZM_ZMV_mul(vecslice(U, 1, l1-1), U1);
3579 0 : U2 = l2==1? const_vec(lg(sprk2), cgetg(1,t_MAT))
3580 222 : : ZM_ZMV_mul(vecslice(U, l1, nbgen), U2);
3581 222 : U = shallowconcat(U1, U2);
3582 : }
3583 : else
3584 0 : U = const_vec(lg(sprk), cgetg(1,t_MAT));
3585 :
3586 222 : if (gen)
3587 : {
3588 222 : GEN uv = zkchinese1init2(nf, I2, I1, x);
3589 444 : gen = shallowconcat(zkVchinese1(gel(uv,1), abgrp_get_gen(G1)),
3590 222 : zkVchinese1(gel(uv,2), abgrp_get_gen(G2)));
3591 : }
3592 222 : sarch = bid_get_sarch(bid1); /* trivial */
3593 222 : y = bid_grp(nf, u1, cyc, gen, x, sarch);
3594 222 : x = mkvec2(x, bid_get_arch(bid1));
3595 222 : y = mkvec5(x, y, mkvec2(fa, fa2), mkvec2(sprk, sarch), U);
3596 222 : return gc_GEN(av,y);
3597 : }
3598 :
3599 : typedef struct _ideal_data {
3600 : GEN nf, emb, L, pr, prL, sgnU, archp;
3601 : } ideal_data;
3602 :
3603 : /* z <- ( z | f(v[i])_{i=1..#v} ) */
3604 : static void
3605 646583 : concat_join(GEN *pz, GEN v, GEN (*f)(ideal_data*,GEN), ideal_data *data)
3606 : {
3607 646583 : long i, nz, lv = lg(v);
3608 : GEN z, Z;
3609 646583 : if (lv == 1) return;
3610 189564 : z = *pz; nz = lg(z)-1;
3611 189564 : *pz = Z = cgetg(lv + nz, typ(z));
3612 315321 : for (i = 1; i <=nz; i++) gel(Z,i) = gel(z,i);
3613 189564 : Z += nz;
3614 417864 : for (i = 1; i < lv; i++) gel(Z,i) = f(data, gel(v,i));
3615 : }
3616 : static GEN
3617 402 : join_idealinit(ideal_data *D, GEN x)
3618 402 : { return join_bid(D->nf, x, D->prL); }
3619 : static GEN
3620 227898 : join_ideal(ideal_data *D, GEN x)
3621 227898 : { return idealmulpowprime(D->nf, x, D->pr, D->L); }
3622 : static GEN
3623 384 : join_unit(ideal_data *D, GEN x)
3624 : {
3625 384 : GEN bid = join_idealinit(D, gel(x,1)), u = gel(x,2), v = mkvec(D->emb);
3626 384 : if (lg(u) != 1) v = shallowconcat(u, v);
3627 384 : return mkvec2(bid, v);
3628 : }
3629 :
3630 : GEN
3631 42 : log_prk_units_init(GEN bnf)
3632 : {
3633 42 : GEN U = bnf_has_fu(bnf);
3634 42 : if (U) U = matalgtobasis(bnf_get_nf(bnf), U);
3635 18 : else if (!(U = bnf_compactfu_mat(bnf))) (void)bnf_build_units(bnf);
3636 42 : return mkvec2(bnf_get_tuU(bnf), U);
3637 : }
3638 : /* flag & nf_GEN : generators, otherwise no
3639 : * flag &2 : units, otherwise no
3640 : * flag &4 : ideals in HNF, otherwise bid
3641 : * flag &8 : omit ideals which cannot be conductors (pr^1 with Npr=2) */
3642 : static GEN
3643 9668 : Ideallist(GEN bnf, ulong bound, long flag)
3644 : {
3645 9668 : const long do_units = flag & 2, big_id = !(flag & 4), cond = flag & 8;
3646 9668 : const long istar_flag = (flag & nf_GEN) | nf_INIT;
3647 : pari_sp av;
3648 : long i, j;
3649 9668 : GEN nf, z, p, fa, id, BOUND, U, empty = cgetg(1,t_VEC);
3650 : forprime_t S;
3651 : ideal_data ID;
3652 : GEN (*join_z)(ideal_data*, GEN);
3653 :
3654 9668 : if (do_units)
3655 : {
3656 18 : bnf = checkbnf(bnf);
3657 18 : nf = bnf_get_nf(bnf);
3658 18 : join_z = &join_unit;
3659 : }
3660 : else
3661 : {
3662 9650 : nf = checknf(bnf);
3663 9650 : join_z = big_id? &join_idealinit: &join_ideal;
3664 : }
3665 9668 : if ((long)bound <= 0) return empty;
3666 9668 : id = matid(nf_get_degree(nf));
3667 9668 : if (big_id) id = Idealstar(nf,id, istar_flag);
3668 :
3669 : /* z[i] will contain all "objects" of norm i. Depending on flag, this means
3670 : * an ideal, a bid, or a couple [bid, log(units)]. Such objects are stored
3671 : * in vectors, computed one primary component at a time; join_z
3672 : * reconstructs the global object */
3673 9668 : BOUND = utoipos(bound);
3674 9668 : z = const_vec(bound, empty);
3675 9668 : U = do_units? log_prk_units_init(bnf): NULL;
3676 9668 : gel(z,1) = mkvec(U? mkvec2(id, empty): id);
3677 9668 : ID.nf = nf;
3678 :
3679 9668 : p = cgetipos(3);
3680 9668 : u_forprime_init(&S, 2, bound);
3681 9668 : av = avma;
3682 78938 : while ((p[2] = u_forprime_next(&S)))
3683 : {
3684 69270 : if (DEBUGLEVEL>1) err_printf("%ld ",p[2]);
3685 69270 : fa = idealprimedec_limit_norm(nf, p, BOUND);
3686 138452 : for (j = 1; j < lg(fa); j++)
3687 : {
3688 69182 : GEN pr = gel(fa,j), z2 = leafcopy(z);
3689 69182 : ulong Q, q = upr_norm(pr);
3690 : long l;
3691 69182 : ID.pr = ID.prL = pr;
3692 69182 : if (cond && q == 2) { l = 2; Q = 4; } else { l = 1; Q = q; }
3693 156418 : for (; Q <= bound; l++, Q *= q) /* add pr^l */
3694 : {
3695 : ulong iQ;
3696 87236 : ID.L = utoipos(l);
3697 87236 : if (big_id) {
3698 180 : ID.prL = Idealstarprk(nf, pr, l, istar_flag);
3699 180 : if (U)
3700 162 : ID.emb = Q == 2? empty
3701 162 : : log_prk_units(nf, U, gel(bid_get_sprk(ID.prL),1));
3702 : }
3703 733819 : for (iQ = Q,i = 1; iQ <= bound; iQ += Q,i++)
3704 646583 : concat_join(&gel(z,iQ), gel(z2,i), join_z, &ID);
3705 : }
3706 : }
3707 69270 : if (gc_needed(av,1))
3708 : {
3709 15 : if(DEBUGMEM>1) pari_warn(warnmem,"Ideallist");
3710 15 : z = gc_GEN(av, z);
3711 : }
3712 : }
3713 9668 : return z;
3714 : }
3715 : GEN
3716 54 : gideallist(GEN bnf, GEN B, long flag)
3717 : {
3718 54 : pari_sp av = avma;
3719 54 : if (typ(B) != t_INT)
3720 : {
3721 0 : B = gfloor(B);
3722 0 : if (typ(B) != t_INT) pari_err_TYPE("ideallist", B);
3723 0 : if (signe(B) < 0) B = gen_0;
3724 : }
3725 54 : if (signe(B) < 0)
3726 : {
3727 24 : if (flag != 4) pari_err_IMPL("ideallist with bid for single norm");
3728 24 : return gc_GEN(av, ideals_by_norm(checknf(bnf), absi(B)));
3729 : }
3730 30 : if (flag < 0 || flag > 15) pari_err_FLAG("ideallist");
3731 30 : return gc_GEN(av, Ideallist(bnf, itou(B), flag));
3732 : }
3733 : GEN
3734 9638 : ideallist0(GEN bnf, long bound, long flag)
3735 : {
3736 9638 : pari_sp av = avma;
3737 9638 : if (flag < 0 || flag > 15) pari_err_FLAG("ideallist");
3738 9638 : return gc_GEN(av, Ideallist(bnf, bound, flag));
3739 : }
3740 : GEN
3741 9054 : ideallist(GEN bnf,long bound) { return ideallist0(bnf,bound,4); }
3742 :
3743 : /* bid = for module m (without arch. part), arch = archimedean part.
3744 : * Output: bid for [m,arch] */
3745 : static GEN
3746 36 : join_bid_arch(GEN nf, GEN bid, GEN archp)
3747 : {
3748 36 : pari_sp av = avma;
3749 : GEN G, U;
3750 36 : GEN sprk, cyc, y, u1 = NULL, x, sarch, gen;
3751 :
3752 36 : checkbid(bid);
3753 36 : G = bid_get_grp(bid);
3754 36 : x = bid_get_ideal(bid);
3755 36 : sarch = nfarchstar(nf, bid_get_ideal(bid), archp);
3756 36 : sprk = bid_get_sprk(bid);
3757 :
3758 36 : gen = (lg(G)>3)? gel(G,3): NULL;
3759 36 : cyc = diagonal_shallow(shallowconcat(gel(G,2), sarch_get_cyc(sarch)));
3760 36 : cyc = ZM_snf_group(cyc, &U, gen? &u1: NULL);
3761 36 : y = bid_grp(nf, u1, cyc, gen, x, sarch);
3762 36 : U = split_U(U, sprk);
3763 36 : y = mkvec5(mkvec2(x, archp), y, gel(bid,3), mkvec2(sprk, sarch), U);
3764 36 : return gc_GEN(av,y);
3765 : }
3766 : static GEN
3767 36 : join_arch(ideal_data *D, GEN x) {
3768 36 : return join_bid_arch(D->nf, x, D->archp);
3769 : }
3770 : static GEN
3771 12 : join_archunit(ideal_data *D, GEN x) {
3772 12 : GEN bid = join_arch(D, gel(x,1)), u = gel(x,2), v = mkvec(D->emb);
3773 12 : if (lg(u) != 1) v = shallowconcat(u, v);
3774 12 : return mkvec2(bid, v);
3775 : }
3776 :
3777 : /* L from ideallist, add archimedean part */
3778 : GEN
3779 12 : ideallistarch(GEN bnf, GEN L, GEN arch)
3780 : {
3781 : pari_sp av;
3782 12 : long i, j, l = lg(L), lz;
3783 : GEN v, z, V, nf;
3784 : ideal_data ID;
3785 : GEN (*join_z)(ideal_data*, GEN);
3786 :
3787 12 : if (typ(L) != t_VEC) pari_err_TYPE("ideallistarch",L);
3788 12 : if (l == 1) return cgetg(1,t_VEC);
3789 12 : z = gel(L,1);
3790 12 : if (typ(z) != t_VEC) pari_err_TYPE("ideallistarch",z);
3791 12 : z = gel(z,1); /* either a bid or [bid,U] */
3792 12 : ID.archp = vec01_to_indices(arch);
3793 12 : if (lg(z) == 3)
3794 : { /* [bid,U]: do units */
3795 6 : bnf = checkbnf(bnf); nf = bnf_get_nf(bnf);
3796 6 : if (typ(z) != t_VEC) pari_err_TYPE("ideallistarch",z);
3797 6 : ID.emb = zm_to_ZM( rowpermute(nfsign_units(bnf,NULL,1), ID.archp) );
3798 6 : join_z = &join_archunit;
3799 : }
3800 : else
3801 : {
3802 6 : join_z = &join_arch;
3803 6 : nf = checknf(bnf);
3804 : }
3805 12 : ID.nf = nf;
3806 12 : av = avma; V = cgetg(l, t_VEC);
3807 54 : for (i = 1; i < l; i++)
3808 : {
3809 42 : z = gel(L,i); lz = lg(z);
3810 42 : gel(V,i) = v = cgetg(lz,t_VEC);
3811 78 : for (j=1; j<lz; j++) gel(v,j) = join_z(&ID, gel(z,j));
3812 : }
3813 12 : return gc_GEN(av,V);
3814 : }
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