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isl_simple_hull: check for empty/single-disjunct map _after_ detect_equalities
[isl.git] / isl_mat.c
blobf859601e5c71855f9535a7d70f444f3c259dfc60
1 /*
2 * Copyright 2008-2009 Katholieke Universiteit Leuven
3 * Copyright 2014 Ecole Normale Superieure
4 *
5 * Use of this software is governed by the MIT license
6 *
7 * Written by Sven Verdoolaege, K.U.Leuven, Departement
8 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
9 * and Ecole Normale Superieure, 45 rue d'Ulm, 75230 Paris, France
10 */
11
12 #include <isl_ctx_private.h>
13 #include <isl_map_private.h>
14 #include <isl/space.h>
15 #include <isl_seq.h>
16 #include <isl_mat_private.h>
17 #include <isl_vec_private.h>
18 #include <isl_space_private.h>
19 #include <isl_val_private.h>
20 #include <isl/deprecated/mat_int.h>
21
22 isl_ctx *isl_mat_get_ctx(__isl_keep isl_mat *mat)
23 {
24 return mat ? mat->ctx : NULL;
25 }
26
27 struct isl_mat *isl_mat_alloc(struct isl_ctx *ctx,
28 unsigned n_row, unsigned n_col)
29 {
30 int i;
31 struct isl_mat *mat;
32
33 mat = isl_alloc_type(ctx, struct isl_mat);
34 if (!mat)
35 return NULL;
36
37 mat->row = NULL;
38 mat->block = isl_blk_alloc(ctx, n_row * n_col);
39 if (isl_blk_is_error(mat->block))
40 goto error;
41 mat->row = isl_alloc_array(ctx, isl_int *, n_row);
42 if (n_row && !mat->row)
43 goto error;
44
45 for (i = 0; i < n_row; ++i)
46 mat->row[i] = mat->block.data + i * n_col;
47
48 mat->ctx = ctx;
49 isl_ctx_ref(ctx);
50 mat->ref = 1;
51 mat->n_row = n_row;
52 mat->n_col = n_col;
53 mat->max_col = n_col;
54 mat->flags = 0;
55
56 return mat;
57 error:
58 isl_blk_free(ctx, mat->block);
59 free(mat);
60 return NULL;
61 }
62
63 struct isl_mat *isl_mat_extend(struct isl_mat *mat,
64 unsigned n_row, unsigned n_col)
65 {
66 int i;
67 isl_int *old;
68 isl_int **row;
69
70 if (!mat)
71 return NULL;
72
73 if (mat->max_col >= n_col && mat->n_row >= n_row) {
74 if (mat->n_col < n_col)
75 mat->n_col = n_col;
76 return mat;
77 }
78
79 if (mat->max_col < n_col) {
80 struct isl_mat *new_mat;
81
82 if (n_row < mat->n_row)
83 n_row = mat->n_row;
84 new_mat = isl_mat_alloc(mat->ctx, n_row, n_col);
85 if (!new_mat)
86 goto error;
87 for (i = 0; i < mat->n_row; ++i)
88 isl_seq_cpy(new_mat->row[i], mat->row[i], mat->n_col);
89 isl_mat_free(mat);
90 return new_mat;
91 }
92
93 mat = isl_mat_cow(mat);
94 if (!mat)
95 goto error;
96
97 old = mat->block.data;
98 mat->block = isl_blk_extend(mat->ctx, mat->block, n_row * mat->max_col);
99 if (isl_blk_is_error(mat->block))
100 goto error;
101 row = isl_realloc_array(mat->ctx, mat->row, isl_int *, n_row);
102 if (n_row && !row)
103 goto error;
104 mat->row = row;
105
106 for (i = 0; i < mat->n_row; ++i)
107 mat->row[i] = mat->block.data + (mat->row[i] - old);
108 for (i = mat->n_row; i < n_row; ++i)
109 mat->row[i] = mat->block.data + i * mat->max_col;
110 mat->n_row = n_row;
111 if (mat->n_col < n_col)
112 mat->n_col = n_col;
113
114 return mat;
115 error:
116 isl_mat_free(mat);
117 return NULL;
118 }
119
120 __isl_give isl_mat *isl_mat_sub_alloc6(isl_ctx *ctx, isl_int **row,
121 unsigned first_row, unsigned n_row, unsigned first_col, unsigned n_col)
122 {
123 int i;
124 struct isl_mat *mat;
125
126 mat = isl_alloc_type(ctx, struct isl_mat);
127 if (!mat)
128 return NULL;
129 mat->row = isl_alloc_array(ctx, isl_int *, n_row);
130 if (n_row && !mat->row)
131 goto error;
132 for (i = 0; i < n_row; ++i)
133 mat->row[i] = row[first_row+i] + first_col;
134 mat->ctx = ctx;
135 isl_ctx_ref(ctx);
136 mat->ref = 1;
137 mat->n_row = n_row;
138 mat->n_col = n_col;
139 mat->block = isl_blk_empty();
140 mat->flags = ISL_MAT_BORROWED;
141 return mat;
142 error:
143 free(mat);
144 return NULL;
145 }
146
147 __isl_give isl_mat *isl_mat_sub_alloc(__isl_keep isl_mat *mat,
148 unsigned first_row, unsigned n_row, unsigned first_col, unsigned n_col)
149 {
150 if (!mat)
151 return NULL;
152 return isl_mat_sub_alloc6(mat->ctx, mat->row, first_row, n_row,
153 first_col, n_col);
154 }
155
156 void isl_mat_sub_copy(struct isl_ctx *ctx, isl_int **dst, isl_int **src,
157 unsigned n_row, unsigned dst_col, unsigned src_col, unsigned n_col)
158 {
159 int i;
160
161 for (i = 0; i < n_row; ++i)
162 isl_seq_cpy(dst[i]+dst_col, src[i]+src_col, n_col);
163 }
164
165 void isl_mat_sub_neg(struct isl_ctx *ctx, isl_int **dst, isl_int **src,
166 unsigned n_row, unsigned dst_col, unsigned src_col, unsigned n_col)
167 {
168 int i;
169
170 for (i = 0; i < n_row; ++i)
171 isl_seq_neg(dst[i]+dst_col, src[i]+src_col, n_col);
172 }
173
174 struct isl_mat *isl_mat_copy(struct isl_mat *mat)
175 {
176 if (!mat)
177 return NULL;
178
179 mat->ref++;
180 return mat;
181 }
182
183 struct isl_mat *isl_mat_dup(struct isl_mat *mat)
184 {
185 int i;
186 struct isl_mat *mat2;
187
188 if (!mat)
189 return NULL;
190 mat2 = isl_mat_alloc(mat->ctx, mat->n_row, mat->n_col);
191 if (!mat2)
192 return NULL;
193 for (i = 0; i < mat->n_row; ++i)
194 isl_seq_cpy(mat2->row[i], mat->row[i], mat->n_col);
195 return mat2;
196 }
197
198 struct isl_mat *isl_mat_cow(struct isl_mat *mat)
199 {
200 struct isl_mat *mat2;
201 if (!mat)
202 return NULL;
203
204 if (mat->ref == 1 && !ISL_F_ISSET(mat, ISL_MAT_BORROWED))
205 return mat;
206
207 mat2 = isl_mat_dup(mat);
208 isl_mat_free(mat);
209 return mat2;
210 }
211
212 __isl_null isl_mat *isl_mat_free(__isl_take isl_mat *mat)
213 {
214 if (!mat)
215 return NULL;
216
217 if (--mat->ref > 0)
218 return NULL;
219
220 if (!ISL_F_ISSET(mat, ISL_MAT_BORROWED))
221 isl_blk_free(mat->ctx, mat->block);
222 isl_ctx_deref(mat->ctx);
223 free(mat->row);
224 free(mat);
225
226 return NULL;
227 }
228
229 int isl_mat_rows(__isl_keep isl_mat *mat)
230 {
231 return mat ? mat->n_row : -1;
232 }
233
234 int isl_mat_cols(__isl_keep isl_mat *mat)
235 {
236 return mat ? mat->n_col : -1;
237 }
238
239 int isl_mat_get_element(__isl_keep isl_mat *mat, int row, int col, isl_int *v)
240 {
241 if (!mat)
242 return -1;
243 if (row < 0 || row >= mat->n_row)
244 isl_die(mat->ctx, isl_error_invalid, "row out of range",
245 return -1);
246 if (col < 0 || col >= mat->n_col)
247 isl_die(mat->ctx, isl_error_invalid, "column out of range",
248 return -1);
249 isl_int_set(*v, mat->row[row][col]);
250 return 0;
251 }
252
253 /* Extract the element at row "row", oolumn "col" of "mat".
254 */
255 __isl_give isl_val *isl_mat_get_element_val(__isl_keep isl_mat *mat,
256 int row, int col)
257 {
258 isl_ctx *ctx;
259
260 if (!mat)
261 return NULL;
262 ctx = isl_mat_get_ctx(mat);
263 if (row < 0 || row >= mat->n_row)
264 isl_die(ctx, isl_error_invalid, "row out of range",
265 return NULL);
266 if (col < 0 || col >= mat->n_col)
267 isl_die(ctx, isl_error_invalid, "column out of range",
268 return NULL);
269 return isl_val_int_from_isl_int(ctx, mat->row[row][col]);
270 }
271
272 __isl_give isl_mat *isl_mat_set_element(__isl_take isl_mat *mat,
273 int row, int col, isl_int v)
274 {
275 mat = isl_mat_cow(mat);
276 if (!mat)
277 return NULL;
278 if (row < 0 || row >= mat->n_row)
279 isl_die(mat->ctx, isl_error_invalid, "row out of range",
280 goto error);
281 if (col < 0 || col >= mat->n_col)
282 isl_die(mat->ctx, isl_error_invalid, "column out of range",
283 goto error);
284 isl_int_set(mat->row[row][col], v);
285 return mat;
286 error:
287 isl_mat_free(mat);
288 return NULL;
289 }
290
291 __isl_give isl_mat *isl_mat_set_element_si(__isl_take isl_mat *mat,
292 int row, int col, int v)
293 {
294 mat = isl_mat_cow(mat);
295 if (!mat)
296 return NULL;
297 if (row < 0 || row >= mat->n_row)
298 isl_die(mat->ctx, isl_error_invalid, "row out of range",
299 goto error);
300 if (col < 0 || col >= mat->n_col)
301 isl_die(mat->ctx, isl_error_invalid, "column out of range",
302 goto error);
303 isl_int_set_si(mat->row[row][col], v);
304 return mat;
305 error:
306 isl_mat_free(mat);
307 return NULL;
308 }
309
310 /* Replace the element at row "row", column "col" of "mat" by "v".
311 */
312 __isl_give isl_mat *isl_mat_set_element_val(__isl_take isl_mat *mat,
313 int row, int col, __isl_take isl_val *v)
314 {
315 if (!v)
316 return isl_mat_free(mat);
317 if (!isl_val_is_int(v))
318 isl_die(isl_val_get_ctx(v), isl_error_invalid,
319 "expecting integer value", goto error);
320 mat = isl_mat_set_element(mat, row, col, v->n);
321 isl_val_free(v);
322 return mat;
323 error:
324 isl_val_free(v);
325 return isl_mat_free(mat);
326 }
327
328 __isl_give isl_mat *isl_mat_diag(isl_ctx *ctx, unsigned n_row, isl_int d)
329 {
330 int i;
331 struct isl_mat *mat;
332
333 mat = isl_mat_alloc(ctx, n_row, n_row);
334 if (!mat)
335 return NULL;
336 for (i = 0; i < n_row; ++i) {
337 isl_seq_clr(mat->row[i], i);
338 isl_int_set(mat->row[i][i], d);
339 isl_seq_clr(mat->row[i]+i+1, n_row-(i+1));
340 }
341
342 return mat;
343 }
344
345 __isl_give isl_mat *isl_mat_identity(isl_ctx *ctx, unsigned n_row)
346 {
347 if (!ctx)
348 return NULL;
349 return isl_mat_diag(ctx, n_row, ctx->one);
350 }
351
352 /* Is "mat" a (possibly scaled) identity matrix?
353 */
354 int isl_mat_is_scaled_identity(__isl_keep isl_mat *mat)
355 {
356 int i;
357
358 if (!mat)
359 return -1;
360 if (mat->n_row != mat->n_col)
361 return 0;
362
363 for (i = 0; i < mat->n_row; ++i) {
364 if (isl_seq_first_non_zero(mat->row[i], i) != -1)
365 return 0;
366 if (isl_int_ne(mat->row[0][0], mat->row[i][i]))
367 return 0;
368 if (isl_seq_first_non_zero(mat->row[i] + i + 1,
369 mat->n_col - (i + 1)) != -1)
370 return 0;
371 }
372
373 return 1;
374 }
375
376 struct isl_vec *isl_mat_vec_product(struct isl_mat *mat, struct isl_vec *vec)
377 {
378 int i;
379 struct isl_vec *prod;
380
381 if (!mat || !vec)
382 goto error;
383
384 isl_assert(mat->ctx, mat->n_col == vec->size, goto error);
385
386 prod = isl_vec_alloc(mat->ctx, mat->n_row);
387 if (!prod)
388 goto error;
389
390 for (i = 0; i < prod->size; ++i)
391 isl_seq_inner_product(mat->row[i], vec->el, vec->size,
392 &prod->block.data[i]);
393 isl_mat_free(mat);
394 isl_vec_free(vec);
395 return prod;
396 error:
397 isl_mat_free(mat);
398 isl_vec_free(vec);
399 return NULL;
400 }
401
402 __isl_give isl_vec *isl_mat_vec_inverse_product(__isl_take isl_mat *mat,
403 __isl_take isl_vec *vec)
404 {
405 struct isl_mat *vec_mat;
406 int i;
407
408 if (!mat || !vec)
409 goto error;
410 vec_mat = isl_mat_alloc(vec->ctx, vec->size, 1);
411 if (!vec_mat)
412 goto error;
413 for (i = 0; i < vec->size; ++i)
414 isl_int_set(vec_mat->row[i][0], vec->el[i]);
415 vec_mat = isl_mat_inverse_product(mat, vec_mat);
416 isl_vec_free(vec);
417 if (!vec_mat)
418 return NULL;
419 vec = isl_vec_alloc(vec_mat->ctx, vec_mat->n_row);
420 if (vec)
421 for (i = 0; i < vec->size; ++i)
422 isl_int_set(vec->el[i], vec_mat->row[i][0]);
423 isl_mat_free(vec_mat);
424 return vec;
425 error:
426 isl_mat_free(mat);
427 isl_vec_free(vec);
428 return NULL;
429 }
430
431 struct isl_vec *isl_vec_mat_product(struct isl_vec *vec, struct isl_mat *mat)
432 {
433 int i, j;
434 struct isl_vec *prod;
435
436 if (!mat || !vec)
437 goto error;
438
439 isl_assert(mat->ctx, mat->n_row == vec->size, goto error);
440
441 prod = isl_vec_alloc(mat->ctx, mat->n_col);
442 if (!prod)
443 goto error;
444
445 for (i = 0; i < prod->size; ++i) {
446 isl_int_set_si(prod->el[i], 0);
447 for (j = 0; j < vec->size; ++j)
448 isl_int_addmul(prod->el[i], vec->el[j], mat->row[j][i]);
449 }
450 isl_mat_free(mat);
451 isl_vec_free(vec);
452 return prod;
453 error:
454 isl_mat_free(mat);
455 isl_vec_free(vec);
456 return NULL;
457 }
458
459 struct isl_mat *isl_mat_aff_direct_sum(struct isl_mat *left,
460 struct isl_mat *right)
461 {
462 int i;
463 struct isl_mat *sum;
464
465 if (!left || !right)
466 goto error;
467
468 isl_assert(left->ctx, left->n_row == right->n_row, goto error);
469 isl_assert(left->ctx, left->n_row >= 1, goto error);
470 isl_assert(left->ctx, left->n_col >= 1, goto error);
471 isl_assert(left->ctx, right->n_col >= 1, goto error);
472 isl_assert(left->ctx,
473 isl_seq_first_non_zero(left->row[0]+1, left->n_col-1) == -1,
474 goto error);
475 isl_assert(left->ctx,
476 isl_seq_first_non_zero(right->row[0]+1, right->n_col-1) == -1,
477 goto error);
478
479 sum = isl_mat_alloc(left->ctx, left->n_row, left->n_col + right->n_col - 1);
480 if (!sum)
481 goto error;
482 isl_int_lcm(sum->row[0][0], left->row[0][0], right->row[0][0]);
483 isl_int_divexact(left->row[0][0], sum->row[0][0], left->row[0][0]);
484 isl_int_divexact(right->row[0][0], sum->row[0][0], right->row[0][0]);
485
486 isl_seq_clr(sum->row[0]+1, sum->n_col-1);
487 for (i = 1; i < sum->n_row; ++i) {
488 isl_int_mul(sum->row[i][0], left->row[0][0], left->row[i][0]);
489 isl_int_addmul(sum->row[i][0],
490 right->row[0][0], right->row[i][0]);
491 isl_seq_scale(sum->row[i]+1, left->row[i]+1, left->row[0][0],
492 left->n_col-1);
493 isl_seq_scale(sum->row[i]+left->n_col,
494 right->row[i]+1, right->row[0][0],
495 right->n_col-1);
496 }
497
498 isl_int_divexact(left->row[0][0], sum->row[0][0], left->row[0][0]);
499 isl_int_divexact(right->row[0][0], sum->row[0][0], right->row[0][0]);
500 isl_mat_free(left);
501 isl_mat_free(right);
502 return sum;
503 error:
504 isl_mat_free(left);
505 isl_mat_free(right);
506 return NULL;
507 }
508
509 static void exchange(struct isl_mat *M, struct isl_mat **U,
510 struct isl_mat **Q, unsigned row, unsigned i, unsigned j)
511 {
512 int r;
513 for (r = row; r < M->n_row; ++r)
514 isl_int_swap(M->row[r][i], M->row[r][j]);
515 if (U) {
516 for (r = 0; r < (*U)->n_row; ++r)
517 isl_int_swap((*U)->row[r][i], (*U)->row[r][j]);
518 }
519 if (Q)
520 isl_mat_swap_rows(*Q, i, j);
521 }
522
523 static void subtract(struct isl_mat *M, struct isl_mat **U,
524 struct isl_mat **Q, unsigned row, unsigned i, unsigned j, isl_int m)
525 {
526 int r;
527 for (r = row; r < M->n_row; ++r)
528 isl_int_submul(M->row[r][j], m, M->row[r][i]);
529 if (U) {
530 for (r = 0; r < (*U)->n_row; ++r)
531 isl_int_submul((*U)->row[r][j], m, (*U)->row[r][i]);
532 }
533 if (Q) {
534 for (r = 0; r < (*Q)->n_col; ++r)
535 isl_int_addmul((*Q)->row[i][r], m, (*Q)->row[j][r]);
536 }
537 }
538
539 static void oppose(struct isl_mat *M, struct isl_mat **U,
540 struct isl_mat **Q, unsigned row, unsigned col)
541 {
542 int r;
543 for (r = row; r < M->n_row; ++r)
544 isl_int_neg(M->row[r][col], M->row[r][col]);
545 if (U) {
546 for (r = 0; r < (*U)->n_row; ++r)
547 isl_int_neg((*U)->row[r][col], (*U)->row[r][col]);
548 }
549 if (Q)
550 isl_seq_neg((*Q)->row[col], (*Q)->row[col], (*Q)->n_col);
551 }
552
553 /* Given matrix M, compute
554 *
555 * M U = H
556 * M = H Q
557 *
558 * with U and Q unimodular matrices and H a matrix in column echelon form
559 * such that on each echelon row the entries in the non-echelon column
560 * are non-negative (if neg == 0) or non-positive (if neg == 1)
561 * and strictly smaller (in absolute value) than the entries in the echelon
562 * column.
563 * If U or Q are NULL, then these matrices are not computed.
564 */
565 struct isl_mat *isl_mat_left_hermite(struct isl_mat *M, int neg,
566 struct isl_mat **U, struct isl_mat **Q)
567 {
568 isl_int c;
569 int row, col;
570
571 if (U)
572 *U = NULL;
573 if (Q)
574 *Q = NULL;
575 if (!M)
576 goto error;
577 M = isl_mat_cow(M);
578 if (!M)
579 goto error;
580 if (U) {
581 *U = isl_mat_identity(M->ctx, M->n_col);
582 if (!*U)
583 goto error;
584 }
585 if (Q) {
586 *Q = isl_mat_identity(M->ctx, M->n_col);
587 if (!*Q)
588 goto error;
589 }
590
591 col = 0;
592 isl_int_init(c);
593 for (row = 0; row < M->n_row; ++row) {
594 int first, i, off;
595 first = isl_seq_abs_min_non_zero(M->row[row]+col, M->n_col-col);
596 if (first == -1)
597 continue;
598 first += col;
599 if (first != col)
600 exchange(M, U, Q, row, first, col);
601 if (isl_int_is_neg(M->row[row][col]))
602 oppose(M, U, Q, row, col);
603 first = col+1;
604 while ((off = isl_seq_first_non_zero(M->row[row]+first,
605 M->n_col-first)) != -1) {
606 first += off;
607 isl_int_fdiv_q(c, M->row[row][first], M->row[row][col]);
608 subtract(M, U, Q, row, col, first, c);
609 if (!isl_int_is_zero(M->row[row][first]))
610 exchange(M, U, Q, row, first, col);
611 else
612 ++first;
613 }
614 for (i = 0; i < col; ++i) {
615 if (isl_int_is_zero(M->row[row][i]))
616 continue;
617 if (neg)
618 isl_int_cdiv_q(c, M->row[row][i], M->row[row][col]);
619 else
620 isl_int_fdiv_q(c, M->row[row][i], M->row[row][col]);
621 if (isl_int_is_zero(c))
622 continue;
623 subtract(M, U, Q, row, col, i, c);
624 }
625 ++col;
626 }
627 isl_int_clear(c);
628
629 return M;
630 error:
631 if (Q) {
632 isl_mat_free(*Q);
633 *Q = NULL;
634 }
635 if (U) {
636 isl_mat_free(*U);
637 *U = NULL;
638 }
639 isl_mat_free(M);
640 return NULL;
641 }
642
643 struct isl_mat *isl_mat_right_kernel(struct isl_mat *mat)
644 {
645 int i, rank;
646 struct isl_mat *U = NULL;
647 struct isl_mat *K;
648
649 mat = isl_mat_left_hermite(mat, 0, &U, NULL);
650 if (!mat || !U)
651 goto error;
652
653 for (i = 0, rank = 0; rank < mat->n_col; ++rank) {
654 while (i < mat->n_row && isl_int_is_zero(mat->row[i][rank]))
655 ++i;
656 if (i >= mat->n_row)
657 break;
658 }
659 K = isl_mat_alloc(U->ctx, U->n_row, U->n_col - rank);
660 if (!K)
661 goto error;
662 isl_mat_sub_copy(K->ctx, K->row, U->row, U->n_row, 0, rank, U->n_col-rank);
663 isl_mat_free(mat);
664 isl_mat_free(U);
665 return K;
666 error:
667 isl_mat_free(mat);
668 isl_mat_free(U);
669 return NULL;
670 }
671
672 struct isl_mat *isl_mat_lin_to_aff(struct isl_mat *mat)
673 {
674 int i;
675 struct isl_mat *mat2;
676
677 if (!mat)
678 return NULL;
679 mat2 = isl_mat_alloc(mat->ctx, 1+mat->n_row, 1+mat->n_col);
680 if (!mat2)
681 goto error;
682 isl_int_set_si(mat2->row[0][0], 1);
683 isl_seq_clr(mat2->row[0]+1, mat->n_col);
684 for (i = 0; i < mat->n_row; ++i) {
685 isl_int_set_si(mat2->row[1+i][0], 0);
686 isl_seq_cpy(mat2->row[1+i]+1, mat->row[i], mat->n_col);
687 }
688 isl_mat_free(mat);
689 return mat2;
690 error:
691 isl_mat_free(mat);
692 return NULL;
693 }
694
695 /* Given two matrices M1 and M2, return the block matrix
696 *
697 * [ M1 0 ]
698 * [ 0 M2 ]
699 */
700 __isl_give isl_mat *isl_mat_diagonal(__isl_take isl_mat *mat1,
701 __isl_take isl_mat *mat2)
702 {
703 int i;
704 isl_mat *mat;
705
706 if (!mat1 || !mat2)
707 goto error;
708
709 mat = isl_mat_alloc(mat1->ctx, mat1->n_row + mat2->n_row,
710 mat1->n_col + mat2->n_col);
711 if (!mat)
712 goto error;
713 for (i = 0; i < mat1->n_row; ++i) {
714 isl_seq_cpy(mat->row[i], mat1->row[i], mat1->n_col);
715 isl_seq_clr(mat->row[i] + mat1->n_col, mat2->n_col);
716 }
717 for (i = 0; i < mat2->n_row; ++i) {
718 isl_seq_clr(mat->row[mat1->n_row + i], mat1->n_col);
719 isl_seq_cpy(mat->row[mat1->n_row + i] + mat1->n_col,
720 mat2->row[i], mat2->n_col);
721 }
722 isl_mat_free(mat1);
723 isl_mat_free(mat2);
724 return mat;
725 error:
726 isl_mat_free(mat1);
727 isl_mat_free(mat2);
728 return NULL;
729 }
730
731 static int row_first_non_zero(isl_int **row, unsigned n_row, unsigned col)
732 {
733 int i;
734
735 for (i = 0; i < n_row; ++i)
736 if (!isl_int_is_zero(row[i][col]))
737 return i;
738 return -1;
739 }
740
741 static int row_abs_min_non_zero(isl_int **row, unsigned n_row, unsigned col)
742 {
743 int i, min = row_first_non_zero(row, n_row, col);
744 if (min < 0)
745 return -1;
746 for (i = min + 1; i < n_row; ++i) {
747 if (isl_int_is_zero(row[i][col]))
748 continue;
749 if (isl_int_abs_lt(row[i][col], row[min][col]))
750 min = i;
751 }
752 return min;
753 }
754
755 static void inv_exchange(struct isl_mat *left, struct isl_mat *right,
756 unsigned i, unsigned j)
757 {
758 left = isl_mat_swap_rows(left, i, j);
759 right = isl_mat_swap_rows(right, i, j);
760 }
761
762 static void inv_oppose(
763 struct isl_mat *left, struct isl_mat *right, unsigned row)
764 {
765 isl_seq_neg(left->row[row]+row, left->row[row]+row, left->n_col-row);
766 isl_seq_neg(right->row[row], right->row[row], right->n_col);
767 }
768
769 static void inv_subtract(struct isl_mat *left, struct isl_mat *right,
770 unsigned row, unsigned i, isl_int m)
771 {
772 isl_int_neg(m, m);
773 isl_seq_combine(left->row[i]+row,
774 left->ctx->one, left->row[i]+row,
775 m, left->row[row]+row,
776 left->n_col-row);
777 isl_seq_combine(right->row[i], right->ctx->one, right->row[i],
778 m, right->row[row], right->n_col);
779 }
780
781 /* Compute inv(left)*right
782 */
783 struct isl_mat *isl_mat_inverse_product(struct isl_mat *left,
784 struct isl_mat *right)
785 {
786 int row;
787 isl_int a, b;
788
789 if (!left || !right)
790 goto error;
791
792 isl_assert(left->ctx, left->n_row == left->n_col, goto error);
793 isl_assert(left->ctx, left->n_row == right->n_row, goto error);
794
795 if (left->n_row == 0) {
796 isl_mat_free(left);
797 return right;
798 }
799
800 left = isl_mat_cow(left);
801 right = isl_mat_cow(right);
802 if (!left || !right)
803 goto error;
804
805 isl_int_init(a);
806 isl_int_init(b);
807 for (row = 0; row < left->n_row; ++row) {
808 int pivot, first, i, off;
809 pivot = row_abs_min_non_zero(left->row+row, left->n_row-row, row);
810 if (pivot < 0) {
811 isl_int_clear(a);
812 isl_int_clear(b);
813 isl_assert(left->ctx, pivot >= 0, goto error);
814 }
815 pivot += row;
816 if (pivot != row)
817 inv_exchange(left, right, pivot, row);
818 if (isl_int_is_neg(left->row[row][row]))
819 inv_oppose(left, right, row);
820 first = row+1;
821 while ((off = row_first_non_zero(left->row+first,
822 left->n_row-first, row)) != -1) {
823 first += off;
824 isl_int_fdiv_q(a, left->row[first][row],
825 left->row[row][row]);
826 inv_subtract(left, right, row, first, a);
827 if (!isl_int_is_zero(left->row[first][row]))
828 inv_exchange(left, right, row, first);
829 else
830 ++first;
831 }
832 for (i = 0; i < row; ++i) {
833 if (isl_int_is_zero(left->row[i][row]))
834 continue;
835 isl_int_gcd(a, left->row[row][row], left->row[i][row]);
836 isl_int_divexact(b, left->row[i][row], a);
837 isl_int_divexact(a, left->row[row][row], a);
838 isl_int_neg(b, b);
839 isl_seq_combine(left->row[i] + i,
840 a, left->row[i] + i,
841 b, left->row[row] + i,
842 left->n_col - i);
843 isl_seq_combine(right->row[i], a, right->row[i],
844 b, right->row[row], right->n_col);
845 }
846 }
847 isl_int_clear(b);
848
849 isl_int_set(a, left->row[0][0]);
850 for (row = 1; row < left->n_row; ++row)
851 isl_int_lcm(a, a, left->row[row][row]);
852 if (isl_int_is_zero(a)){
853 isl_int_clear(a);
854 isl_assert(left->ctx, 0, goto error);
855 }
856 for (row = 0; row < left->n_row; ++row) {
857 isl_int_divexact(left->row[row][row], a, left->row[row][row]);
858 if (isl_int_is_one(left->row[row][row]))
859 continue;
860 isl_seq_scale(right->row[row], right->row[row],
861 left->row[row][row], right->n_col);
862 }
863 isl_int_clear(a);
864
865 isl_mat_free(left);
866 return right;
867 error:
868 isl_mat_free(left);
869 isl_mat_free(right);
870 return NULL;
871 }
872
873 void isl_mat_col_scale(struct isl_mat *mat, unsigned col, isl_int m)
874 {
875 int i;
876
877 for (i = 0; i < mat->n_row; ++i)
878 isl_int_mul(mat->row[i][col], mat->row[i][col], m);
879 }
880
881 void isl_mat_col_combine(struct isl_mat *mat, unsigned dst,
882 isl_int m1, unsigned src1, isl_int m2, unsigned src2)
883 {
884 int i;
885 isl_int tmp;
886
887 isl_int_init(tmp);
888 for (i = 0; i < mat->n_row; ++i) {
889 isl_int_mul(tmp, m1, mat->row[i][src1]);
890 isl_int_addmul(tmp, m2, mat->row[i][src2]);
891 isl_int_set(mat->row[i][dst], tmp);
892 }
893 isl_int_clear(tmp);
894 }
895
896 struct isl_mat *isl_mat_right_inverse(struct isl_mat *mat)
897 {
898 struct isl_mat *inv;
899 int row;
900 isl_int a, b;
901
902 mat = isl_mat_cow(mat);
903 if (!mat)
904 return NULL;
905
906 inv = isl_mat_identity(mat->ctx, mat->n_col);
907 inv = isl_mat_cow(inv);
908 if (!inv)
909 goto error;
910
911 isl_int_init(a);
912 isl_int_init(b);
913 for (row = 0; row < mat->n_row; ++row) {
914 int pivot, first, i, off;
915 pivot = isl_seq_abs_min_non_zero(mat->row[row]+row, mat->n_col-row);
916 if (pivot < 0) {
917 isl_int_clear(a);
918 isl_int_clear(b);
919 isl_assert(mat->ctx, pivot >= 0, goto error);
920 }
921 pivot += row;
922 if (pivot != row)
923 exchange(mat, &inv, NULL, row, pivot, row);
924 if (isl_int_is_neg(mat->row[row][row]))
925 oppose(mat, &inv, NULL, row, row);
926 first = row+1;
927 while ((off = isl_seq_first_non_zero(mat->row[row]+first,
928 mat->n_col-first)) != -1) {
929 first += off;
930 isl_int_fdiv_q(a, mat->row[row][first],
931 mat->row[row][row]);
932 subtract(mat, &inv, NULL, row, row, first, a);
933 if (!isl_int_is_zero(mat->row[row][first]))
934 exchange(mat, &inv, NULL, row, row, first);
935 else
936 ++first;
937 }
938 for (i = 0; i < row; ++i) {
939 if (isl_int_is_zero(mat->row[row][i]))
940 continue;
941 isl_int_gcd(a, mat->row[row][row], mat->row[row][i]);
942 isl_int_divexact(b, mat->row[row][i], a);
943 isl_int_divexact(a, mat->row[row][row], a);
944 isl_int_neg(a, a);
945 isl_mat_col_combine(mat, i, a, i, b, row);
946 isl_mat_col_combine(inv, i, a, i, b, row);
947 }
948 }
949 isl_int_clear(b);
950
951 isl_int_set(a, mat->row[0][0]);
952 for (row = 1; row < mat->n_row; ++row)
953 isl_int_lcm(a, a, mat->row[row][row]);
954 if (isl_int_is_zero(a)){
955 isl_int_clear(a);
956 goto error;
957 }
958 for (row = 0; row < mat->n_row; ++row) {
959 isl_int_divexact(mat->row[row][row], a, mat->row[row][row]);
960 if (isl_int_is_one(mat->row[row][row]))
961 continue;
962 isl_mat_col_scale(inv, row, mat->row[row][row]);
963 }
964 isl_int_clear(a);
965
966 isl_mat_free(mat);
967
968 return inv;
969 error:
970 isl_mat_free(mat);
971 isl_mat_free(inv);
972 return NULL;
973 }
974
975 struct isl_mat *isl_mat_transpose(struct isl_mat *mat)
976 {
977 struct isl_mat *transpose = NULL;
978 int i, j;
979
980 if (!mat)
981 return NULL;
982
983 if (mat->n_col == mat->n_row) {
984 mat = isl_mat_cow(mat);
985 if (!mat)
986 return NULL;
987 for (i = 0; i < mat->n_row; ++i)
988 for (j = i + 1; j < mat->n_col; ++j)
989 isl_int_swap(mat->row[i][j], mat->row[j][i]);
990 return mat;
991 }
992 transpose = isl_mat_alloc(mat->ctx, mat->n_col, mat->n_row);
993 if (!transpose)
994 goto error;
995 for (i = 0; i < mat->n_row; ++i)
996 for (j = 0; j < mat->n_col; ++j)
997 isl_int_set(transpose->row[j][i], mat->row[i][j]);
998 isl_mat_free(mat);
999 return transpose;
1000 error:
1001 isl_mat_free(mat);
1002 return NULL;
1003 }
1004
1005 struct isl_mat *isl_mat_swap_cols(struct isl_mat *mat, unsigned i, unsigned j)
1006 {
1007 int r;
1008
1009 mat = isl_mat_cow(mat);
1010 if (!mat)
1011 return NULL;
1012 isl_assert(mat->ctx, i < mat->n_col, goto error);
1013 isl_assert(mat->ctx, j < mat->n_col, goto error);
1014
1015 for (r = 0; r < mat->n_row; ++r)
1016 isl_int_swap(mat->row[r][i], mat->row[r][j]);
1017 return mat;
1018 error:
1019 isl_mat_free(mat);
1020 return NULL;
1021 }
1022
1023 struct isl_mat *isl_mat_swap_rows(struct isl_mat *mat, unsigned i, unsigned j)
1024 {
1025 isl_int *t;
1026
1027 if (!mat)
1028 return NULL;
1029 mat = isl_mat_cow(mat);
1030 if (!mat)
1031 return NULL;
1032 t = mat->row[i];
1033 mat->row[i] = mat->row[j];
1034 mat->row[j] = t;
1035 return mat;
1036 }
1037
1038 /* Calculate the product of two matrices.
1039 *
1040 * This function is optimized for operand matrices that contain many zeros and
1041 * skips multiplications where we know one of the operands is zero.
1042 */
1043 __isl_give isl_mat *isl_mat_product(__isl_take isl_mat *left,
1044 __isl_take isl_mat *right)
1045 {
1046 int i, j, k;
1047 struct isl_mat *prod;
1048
1049 if (!left || !right)
1050 goto error;
1051 isl_assert(left->ctx, left->n_col == right->n_row, goto error);
1052 prod = isl_mat_alloc(left->ctx, left->n_row, right->n_col);
1053 if (!prod)
1054 goto error;
1055 if (left->n_col == 0) {
1056 for (i = 0; i < prod->n_row; ++i)
1057 isl_seq_clr(prod->row[i], prod->n_col);
1058 isl_mat_free(left);
1059 isl_mat_free(right);
1060 return prod;
1061 }
1062 for (i = 0; i < prod->n_row; ++i) {
1063 for (j = 0; j < prod->n_col; ++j)
1064 isl_int_mul(prod->row[i][j],
1065 left->row[i][0], right->row[0][j]);
1066 for (k = 1; k < left->n_col; ++k) {
1067 if (isl_int_is_zero(left->row[i][k]))
1068 continue;
1069 for (j = 0; j < prod->n_col; ++j)
1070 isl_int_addmul(prod->row[i][j],
1071 left->row[i][k], right->row[k][j]);
1072 }
1073 }
1074 isl_mat_free(left);
1075 isl_mat_free(right);
1076 return prod;
1077 error:
1078 isl_mat_free(left);
1079 isl_mat_free(right);
1080 return NULL;
1081 }
1082
1083 /* Replace the variables x in the rows q by x' given by x = M x',
1084 * with M the matrix mat.
1085 *
1086 * If the number of new variables is greater than the original
1087 * number of variables, then the rows q have already been
1088 * preextended. If the new number is smaller, then the coefficients
1089 * of the divs, which are not changed, need to be shifted down.
1090 * The row q may be the equalities, the inequalities or the
1091 * div expressions. In the latter case, has_div is true and
1092 * we need to take into account the extra denominator column.
1093 */
1094 static int preimage(struct isl_ctx *ctx, isl_int **q, unsigned n,
1095 unsigned n_div, int has_div, struct isl_mat *mat)
1096 {
1097 int i;
1098 struct isl_mat *t;
1099 int e;
1100
1101 if (mat->n_col >= mat->n_row)
1102 e = 0;
1103 else
1104 e = mat->n_row - mat->n_col;
1105 if (has_div)
1106 for (i = 0; i < n; ++i)
1107 isl_int_mul(q[i][0], q[i][0], mat->row[0][0]);
1108 t = isl_mat_sub_alloc6(mat->ctx, q, 0, n, has_div, mat->n_row);
1109 t = isl_mat_product(t, mat);
1110 if (!t)
1111 return -1;
1112 for (i = 0; i < n; ++i) {
1113 isl_seq_swp_or_cpy(q[i] + has_div, t->row[i], t->n_col);
1114 isl_seq_cpy(q[i] + has_div + t->n_col,
1115 q[i] + has_div + t->n_col + e, n_div);
1116 isl_seq_clr(q[i] + has_div + t->n_col + n_div, e);
1117 }
1118 isl_mat_free(t);
1119 return 0;
1120 }
1121
1122 /* Replace the variables x in bset by x' given by x = M x', with
1123 * M the matrix mat.
1124 *
1125 * If there are fewer variables x' then there are x, then we perform
1126 * the transformation in place, which that, in principle,
1127 * this frees up some extra variables as the number
1128 * of columns remains constant, but we would have to extend
1129 * the div array too as the number of rows in this array is assumed
1130 * to be equal to extra.
1131 */
1132 struct isl_basic_set *isl_basic_set_preimage(struct isl_basic_set *bset,
1133 struct isl_mat *mat)
1134 {
1135 struct isl_ctx *ctx;
1136
1137 if (!bset || !mat)
1138 goto error;
1139
1140 ctx = bset->ctx;
1141 bset = isl_basic_set_cow(bset);
1142 if (!bset)
1143 goto error;
1144
1145 isl_assert(ctx, bset->dim->nparam == 0, goto error);
1146 isl_assert(ctx, 1+bset->dim->n_out == mat->n_row, goto error);
1147 isl_assert(ctx, mat->n_col > 0, goto error);
1148
1149 if (mat->n_col > mat->n_row) {
1150 bset = isl_basic_set_extend(bset, 0, mat->n_col-1, 0, 0, 0);
1151 if (!bset)
1152 goto error;
1153 } else if (mat->n_col < mat->n_row) {
1154 bset->dim = isl_space_cow(bset->dim);
1155 if (!bset->dim)
1156 goto error;
1157 bset->dim->n_out -= mat->n_row - mat->n_col;
1158 }
1159
1160 if (preimage(ctx, bset->eq, bset->n_eq, bset->n_div, 0,
1161 isl_mat_copy(mat)) < 0)
1162 goto error;
1163
1164 if (preimage(ctx, bset->ineq, bset->n_ineq, bset->n_div, 0,
1165 isl_mat_copy(mat)) < 0)
1166 goto error;
1167
1168 if (preimage(ctx, bset->div, bset->n_div, bset->n_div, 1, mat) < 0)
1169 goto error2;
1170
1171 ISL_F_CLR(bset, ISL_BASIC_SET_NO_IMPLICIT);
1172 ISL_F_CLR(bset, ISL_BASIC_SET_NO_REDUNDANT);
1173 ISL_F_CLR(bset, ISL_BASIC_SET_NORMALIZED);
1174 ISL_F_CLR(bset, ISL_BASIC_SET_NORMALIZED_DIVS);
1175 ISL_F_CLR(bset, ISL_BASIC_SET_ALL_EQUALITIES);
1176
1177 bset = isl_basic_set_simplify(bset);
1178 bset = isl_basic_set_finalize(bset);
1179
1180 return bset;
1181 error:
1182 isl_mat_free(mat);
1183 error2:
1184 isl_basic_set_free(bset);
1185 return NULL;
1186 }
1187
1188 struct isl_set *isl_set_preimage(struct isl_set *set, struct isl_mat *mat)
1189 {
1190 int i;
1191
1192 set = isl_set_cow(set);
1193 if (!set)
1194 return NULL;
1195
1196 for (i = 0; i < set->n; ++i) {
1197 set->p[i] = isl_basic_set_preimage(set->p[i],
1198 isl_mat_copy(mat));
1199 if (!set->p[i])
1200 goto error;
1201 }
1202 if (mat->n_col != mat->n_row) {
1203 set->dim = isl_space_cow(set->dim);
1204 if (!set->dim)
1205 goto error;
1206 set->dim->n_out += mat->n_col;
1207 set->dim->n_out -= mat->n_row;
1208 }
1209 isl_mat_free(mat);
1210 ISL_F_CLR(set, ISL_SET_NORMALIZED);
1211 return set;
1212 error:
1213 isl_set_free(set);
1214 isl_mat_free(mat);
1215 return NULL;
1216 }
1217
1218 /* Replace the variables x starting at pos in the rows q
1219 * by x' with x = M x' with M the matrix mat.
1220 * That is, replace the corresponding coefficients c by c M.
1221 */
1222 static int transform(isl_ctx *ctx, isl_int **q, unsigned n,
1223 unsigned pos, __isl_take isl_mat *mat)
1224 {
1225 int i;
1226 isl_mat *t;
1227
1228 t = isl_mat_sub_alloc6(ctx, q, 0, n, pos, mat->n_row);
1229 t = isl_mat_product(t, mat);
1230 if (!t)
1231 return -1;
1232 for (i = 0; i < n; ++i)
1233 isl_seq_swp_or_cpy(q[i] + pos, t->row[i], t->n_col);
1234 isl_mat_free(t);
1235 return 0;
1236 }
1237
1238 /* Replace the variables x of type "type" starting at "first" in "bset"
1239 * by x' with x = M x' with M the matrix trans.
1240 * That is, replace the corresponding coefficients c by c M.
1241 *
1242 * The transformation matrix should be a square matrix.
1243 */
1244 __isl_give isl_basic_set *isl_basic_set_transform_dims(
1245 __isl_take isl_basic_set *bset, enum isl_dim_type type, unsigned first,
1246 __isl_take isl_mat *trans)
1247 {
1248 isl_ctx *ctx;
1249 unsigned pos;
1250
1251 bset = isl_basic_set_cow(bset);
1252 if (!bset || !trans)
1253 goto error;
1254
1255 ctx = isl_basic_set_get_ctx(bset);
1256 if (trans->n_row != trans->n_col)
1257 isl_die(trans->ctx, isl_error_invalid,
1258 "expecting square transformation matrix", goto error);
1259 if (first + trans->n_row > isl_basic_set_dim(bset, type))
1260 isl_die(trans->ctx, isl_error_invalid,
1261 "oversized transformation matrix", goto error);
1262
1263 pos = isl_basic_set_offset(bset, type) + first;
1264
1265 if (transform(ctx, bset->eq, bset->n_eq, pos, isl_mat_copy(trans)) < 0)
1266 goto error;
1267 if (transform(ctx, bset->ineq, bset->n_ineq, pos,
1268 isl_mat_copy(trans)) < 0)
1269 goto error;
1270 if (transform(ctx, bset->div, bset->n_div, 1 + pos,
1271 isl_mat_copy(trans)) < 0)
1272 goto error;
1273
1274 ISL_F_CLR(bset, ISL_BASIC_SET_NORMALIZED);
1275 ISL_F_CLR(bset, ISL_BASIC_SET_NORMALIZED_DIVS);
1276
1277 isl_mat_free(trans);
1278 return bset;
1279 error:
1280 isl_mat_free(trans);
1281 isl_basic_set_free(bset);
1282 return NULL;
1283 }
1284
1285 void isl_mat_print_internal(__isl_keep isl_mat *mat, FILE *out, int indent)
1286 {
1287 int i, j;
1288
1289 if (!mat) {
1290 fprintf(out, "%*snull mat\n", indent, "");
1291 return;
1292 }
1293
1294 if (mat->n_row == 0)
1295 fprintf(out, "%*s[]\n", indent, "");
1296
1297 for (i = 0; i < mat->n_row; ++i) {
1298 if (!i)
1299 fprintf(out, "%*s[[", indent, "");
1300 else
1301 fprintf(out, "%*s[", indent+1, "");
1302 for (j = 0; j < mat->n_col; ++j) {
1303 if (j)
1304 fprintf(out, ",");
1305 isl_int_print(out, mat->row[i][j], 0);
1306 }
1307 if (i == mat->n_row-1)
1308 fprintf(out, "]]\n");
1309 else
1310 fprintf(out, "]\n");
1311 }
1312 }
1313
1314 void isl_mat_dump(__isl_keep isl_mat *mat)
1315 {
1316 isl_mat_print_internal(mat, stderr, 0);
1317 }
1318
1319 struct isl_mat *isl_mat_drop_cols(struct isl_mat *mat, unsigned col, unsigned n)
1320 {
1321 int r;
1322
1323 if (n == 0)
1324 return mat;
1325
1326 mat = isl_mat_cow(mat);
1327 if (!mat)
1328 return NULL;
1329
1330 if (col != mat->n_col-n) {
1331 for (r = 0; r < mat->n_row; ++r)
1332 isl_seq_cpy(mat->row[r]+col, mat->row[r]+col+n,
1333 mat->n_col - col - n);
1334 }
1335 mat->n_col -= n;
1336 return mat;
1337 }
1338
1339 struct isl_mat *isl_mat_drop_rows(struct isl_mat *mat, unsigned row, unsigned n)
1340 {
1341 int r;
1342
1343 mat = isl_mat_cow(mat);
1344 if (!mat)
1345 return NULL;
1346
1347 for (r = row; r+n < mat->n_row; ++r)
1348 mat->row[r] = mat->row[r+n];
1349
1350 mat->n_row -= n;
1351 return mat;
1352 }
1353
1354 __isl_give isl_mat *isl_mat_insert_cols(__isl_take isl_mat *mat,
1355 unsigned col, unsigned n)
1356 {
1357 isl_mat *ext;
1358
1359 if (!mat)
1360 return NULL;
1361 if (n == 0)
1362 return mat;
1363
1364 ext = isl_mat_alloc(mat->ctx, mat->n_row, mat->n_col + n);
1365 if (!ext)
1366 goto error;
1367
1368 isl_mat_sub_copy(mat->ctx, ext->row, mat->row, mat->n_row, 0, 0, col);
1369 isl_mat_sub_copy(mat->ctx, ext->row, mat->row, mat->n_row,
1370 col + n, col, mat->n_col - col);
1371
1372 isl_mat_free(mat);
1373 return ext;
1374 error:
1375 isl_mat_free(mat);
1376 return NULL;
1377 }
1378
1379 __isl_give isl_mat *isl_mat_insert_zero_cols(__isl_take isl_mat *mat,
1380 unsigned first, unsigned n)
1381 {
1382 int i;
1383
1384 if (!mat)
1385 return NULL;
1386 mat = isl_mat_insert_cols(mat, first, n);
1387 if (!mat)
1388 return NULL;
1389
1390 for (i = 0; i < mat->n_row; ++i)
1391 isl_seq_clr(mat->row[i] + first, n);
1392
1393 return mat;
1394 }
1395
1396 __isl_give isl_mat *isl_mat_add_zero_cols(__isl_take isl_mat *mat, unsigned n)
1397 {
1398 if (!mat)
1399 return NULL;
1400
1401 return isl_mat_insert_zero_cols(mat, mat->n_col, n);
1402 }
1403
1404 __isl_give isl_mat *isl_mat_insert_rows(__isl_take isl_mat *mat,
1405 unsigned row, unsigned n)
1406 {
1407 isl_mat *ext;
1408
1409 if (!mat)
1410 return NULL;
1411 if (n == 0)
1412 return mat;
1413
1414 ext = isl_mat_alloc(mat->ctx, mat->n_row + n, mat->n_col);
1415 if (!ext)
1416 goto error;
1417
1418 isl_mat_sub_copy(mat->ctx, ext->row, mat->row, row, 0, 0, mat->n_col);
1419 isl_mat_sub_copy(mat->ctx, ext->row + row + n, mat->row + row,
1420 mat->n_row - row, 0, 0, mat->n_col);
1421
1422 isl_mat_free(mat);
1423 return ext;
1424 error:
1425 isl_mat_free(mat);
1426 return NULL;
1427 }
1428
1429 __isl_give isl_mat *isl_mat_add_rows(__isl_take isl_mat *mat, unsigned n)
1430 {
1431 if (!mat)
1432 return NULL;
1433
1434 return isl_mat_insert_rows(mat, mat->n_row, n);
1435 }
1436
1437 __isl_give isl_mat *isl_mat_insert_zero_rows(__isl_take isl_mat *mat,
1438 unsigned row, unsigned n)
1439 {
1440 int i;
1441
1442 mat = isl_mat_insert_rows(mat, row, n);
1443 if (!mat)
1444 return NULL;
1445
1446 for (i = 0; i < n; ++i)
1447 isl_seq_clr(mat->row[row + i], mat->n_col);
1448
1449 return mat;
1450 }
1451
1452 __isl_give isl_mat *isl_mat_add_zero_rows(__isl_take isl_mat *mat, unsigned n)
1453 {
1454 if (!mat)
1455 return NULL;
1456
1457 return isl_mat_insert_zero_rows(mat, mat->n_row, n);
1458 }
1459
1460 void isl_mat_col_submul(struct isl_mat *mat,
1461 int dst_col, isl_int f, int src_col)
1462 {
1463 int i;
1464
1465 for (i = 0; i < mat->n_row; ++i)
1466 isl_int_submul(mat->row[i][dst_col], f, mat->row[i][src_col]);
1467 }
1468
1469 void isl_mat_col_add(__isl_keep isl_mat *mat, int dst_col, int src_col)
1470 {
1471 int i;
1472
1473 if (!mat)
1474 return;
1475
1476 for (i = 0; i < mat->n_row; ++i)
1477 isl_int_add(mat->row[i][dst_col],
1478 mat->row[i][dst_col], mat->row[i][src_col]);
1479 }
1480
1481 void isl_mat_col_mul(struct isl_mat *mat, int dst_col, isl_int f, int src_col)
1482 {
1483 int i;
1484
1485 for (i = 0; i < mat->n_row; ++i)
1486 isl_int_mul(mat->row[i][dst_col], f, mat->row[i][src_col]);
1487 }
1488
1489 struct isl_mat *isl_mat_unimodular_complete(struct isl_mat *M, int row)
1490 {
1491 int r;
1492 struct isl_mat *H = NULL, *Q = NULL;
1493
1494 if (!M)
1495 return NULL;
1496
1497 isl_assert(M->ctx, M->n_row == M->n_col, goto error);
1498 M->n_row = row;
1499 H = isl_mat_left_hermite(isl_mat_copy(M), 0, NULL, &Q);
1500 M->n_row = M->n_col;
1501 if (!H)
1502 goto error;
1503 for (r = 0; r < row; ++r)
1504 isl_assert(M->ctx, isl_int_is_one(H->row[r][r]), goto error);
1505 for (r = row; r < M->n_row; ++r)
1506 isl_seq_cpy(M->row[r], Q->row[r], M->n_col);
1507 isl_mat_free(H);
1508 isl_mat_free(Q);
1509 return M;
1510 error:
1511 isl_mat_free(H);
1512 isl_mat_free(Q);
1513 isl_mat_free(M);
1514 return NULL;
1515 }
1516
1517 __isl_give isl_mat *isl_mat_concat(__isl_take isl_mat *top,
1518 __isl_take isl_mat *bot)
1519 {
1520 struct isl_mat *mat;
1521
1522 if (!top || !bot)
1523 goto error;
1524
1525 isl_assert(top->ctx, top->n_col == bot->n_col, goto error);
1526 if (top->n_row == 0) {
1527 isl_mat_free(top);
1528 return bot;
1529 }
1530 if (bot->n_row == 0) {
1531 isl_mat_free(bot);
1532 return top;
1533 }
1534
1535 mat = isl_mat_alloc(top->ctx, top->n_row + bot->n_row, top->n_col);
1536 if (!mat)
1537 goto error;
1538 isl_mat_sub_copy(mat->ctx, mat->row, top->row, top->n_row,
1539 0, 0, mat->n_col);
1540 isl_mat_sub_copy(mat->ctx, mat->row + top->n_row, bot->row, bot->n_row,
1541 0, 0, mat->n_col);
1542 isl_mat_free(top);
1543 isl_mat_free(bot);
1544 return mat;
1545 error:
1546 isl_mat_free(top);
1547 isl_mat_free(bot);
1548 return NULL;
1549 }
1550
1551 int isl_mat_is_equal(__isl_keep isl_mat *mat1, __isl_keep isl_mat *mat2)
1552 {
1553 int i;
1554
1555 if (!mat1 || !mat2)
1556 return -1;
1557
1558 if (mat1->n_row != mat2->n_row)
1559 return 0;
1560
1561 if (mat1->n_col != mat2->n_col)
1562 return 0;
1563
1564 for (i = 0; i < mat1->n_row; ++i)
1565 if (!isl_seq_eq(mat1->row[i], mat2->row[i], mat1->n_col))
1566 return 0;
1567
1568 return 1;
1569 }
1570
1571 __isl_give isl_mat *isl_mat_from_row_vec(__isl_take isl_vec *vec)
1572 {
1573 struct isl_mat *mat;
1574
1575 if (!vec)
1576 return NULL;
1577 mat = isl_mat_alloc(vec->ctx, 1, vec->size);
1578 if (!mat)
1579 goto error;
1580
1581 isl_seq_cpy(mat->row[0], vec->el, vec->size);
1582
1583 isl_vec_free(vec);
1584 return mat;
1585 error:
1586 isl_vec_free(vec);
1587 return NULL;
1588 }
1589
1590 /* Return a copy of row "row" of "mat" as an isl_vec.
1591 */
1592 __isl_give isl_vec *isl_mat_get_row(__isl_keep isl_mat *mat, unsigned row)
1593 {
1594 isl_vec *v;
1595
1596 if (!mat)
1597 return NULL;
1598 if (row >= mat->n_row)
1599 isl_die(mat->ctx, isl_error_invalid, "row out of range",
1600 return NULL);
1601
1602 v = isl_vec_alloc(isl_mat_get_ctx(mat), mat->n_col);
1603 if (!v)
1604 return NULL;
1605 isl_seq_cpy(v->el, mat->row[row], mat->n_col);
1606
1607 return v;
1608 }
1609
1610 __isl_give isl_mat *isl_mat_vec_concat(__isl_take isl_mat *top,
1611 __isl_take isl_vec *bot)
1612 {
1613 return isl_mat_concat(top, isl_mat_from_row_vec(bot));
1614 }
1615
1616 __isl_give isl_mat *isl_mat_move_cols(__isl_take isl_mat *mat,
1617 unsigned dst_col, unsigned src_col, unsigned n)
1618 {
1619 isl_mat *res;
1620
1621 if (!mat)
1622 return NULL;
1623 if (n == 0 || dst_col == src_col)
1624 return mat;
1625
1626 res = isl_mat_alloc(mat->ctx, mat->n_row, mat->n_col);
1627 if (!res)
1628 goto error;
1629
1630 if (dst_col < src_col) {
1631 isl_mat_sub_copy(res->ctx, res->row, mat->row, mat->n_row,
1632 0, 0, dst_col);
1633 isl_mat_sub_copy(res->ctx, res->row, mat->row, mat->n_row,
1634 dst_col, src_col, n);
1635 isl_mat_sub_copy(res->ctx, res->row, mat->row, mat->n_row,
1636 dst_col + n, dst_col, src_col - dst_col);
1637 isl_mat_sub_copy(res->ctx, res->row, mat->row, mat->n_row,
1638 src_col + n, src_col + n,
1639 res->n_col - src_col - n);
1640 } else {
1641 isl_mat_sub_copy(res->ctx, res->row, mat->row, mat->n_row,
1642 0, 0, src_col);
1643 isl_mat_sub_copy(res->ctx, res->row, mat->row, mat->n_row,
1644 src_col, src_col + n, dst_col - src_col);
1645 isl_mat_sub_copy(res->ctx, res->row, mat->row, mat->n_row,
1646 dst_col, src_col, n);
1647 isl_mat_sub_copy(res->ctx, res->row, mat->row, mat->n_row,
1648 dst_col + n, dst_col + n,
1649 res->n_col - dst_col - n);
1650 }
1651 isl_mat_free(mat);
1652
1653 return res;
1654 error:
1655 isl_mat_free(mat);
1656 return NULL;
1657 }
1658
1659 void isl_mat_gcd(__isl_keep isl_mat *mat, isl_int *gcd)
1660 {
1661 int i;
1662 isl_int g;
1663
1664 isl_int_set_si(*gcd, 0);
1665 if (!mat)
1666 return;
1667
1668 isl_int_init(g);
1669 for (i = 0; i < mat->n_row; ++i) {
1670 isl_seq_gcd(mat->row[i], mat->n_col, &g);
1671 isl_int_gcd(*gcd, *gcd, g);
1672 }
1673 isl_int_clear(g);
1674 }
1675
1676 __isl_give isl_mat *isl_mat_scale_down(__isl_take isl_mat *mat, isl_int m)
1677 {
1678 int i;
1679
1680 if (isl_int_is_one(m))
1681 return mat;
1682
1683 mat = isl_mat_cow(mat);
1684 if (!mat)
1685 return NULL;
1686
1687 for (i = 0; i < mat->n_row; ++i)
1688 isl_seq_scale_down(mat->row[i], mat->row[i], m, mat->n_col);
1689
1690 return mat;
1691 }
1692
1693 __isl_give isl_mat *isl_mat_scale_down_row(__isl_take isl_mat *mat, int row,
1694 isl_int m)
1695 {
1696 if (isl_int_is_one(m))
1697 return mat;
1698
1699 mat = isl_mat_cow(mat);
1700 if (!mat)
1701 return NULL;
1702
1703 isl_seq_scale_down(mat->row[row], mat->row[row], m, mat->n_col);
1704
1705 return mat;
1706 }
1707
1708 __isl_give isl_mat *isl_mat_normalize(__isl_take isl_mat *mat)
1709 {
1710 isl_int gcd;
1711
1712 if (!mat)
1713 return NULL;
1714
1715 isl_int_init(gcd);
1716 isl_mat_gcd(mat, &gcd);
1717 mat = isl_mat_scale_down(mat, gcd);
1718 isl_int_clear(gcd);
1719
1720 return mat;
1721 }
1722
1723 __isl_give isl_mat *isl_mat_normalize_row(__isl_take isl_mat *mat, int row)
1724 {
1725 mat = isl_mat_cow(mat);
1726 if (!mat)
1727 return NULL;
1728
1729 isl_seq_normalize(mat->ctx, mat->row[row], mat->n_col);
1730
1731 return mat;
1732 }
1733
1734 /* Number of initial non-zero columns.
1735 */
1736 int isl_mat_initial_non_zero_cols(__isl_keep isl_mat *mat)
1737 {
1738 int i;
1739
1740 if (!mat)
1741 return -1;
1742
1743 for (i = 0; i < mat->n_col; ++i)
1744 if (row_first_non_zero(mat->row, mat->n_row, i) < 0)
1745 break;
1746
1747 return i;
1748 }
Integer set library