isl_union_*_plain_is_equal: also check total number of parts
[isl.git] / isl_val_sioimath.c
blob008f899ed182d4c7dfbdc59191192067875141c7
1 #include <isl_val_private.h>
3 /* Return a reference to an isl_val representing the unsigned
4 * integer value stored in the "n" chunks of size "size" at "chunks".
5 * The least significant chunk is assumed to be stored first.
6 */
7 __isl_give isl_val *isl_val_int_from_chunks(isl_ctx *ctx, size_t n,
8 size_t size, const void *chunks)
10 isl_val *v;
12 v = isl_val_alloc(ctx);
13 if (!v)
14 return NULL;
16 impz_import(isl_sioimath_reinit_big(&v->n), n, -1, size, 0, 0, chunks);
17 isl_sioimath_try_demote(&v->n);
18 isl_int_set_si(v->d, 1);
20 return v;
23 /* Store a representation of the absolute value of the numerator of "v"
24 * in terms of chunks of size "size" at "chunks".
25 * The least significant chunk is stored first.
26 * The number of chunks in the result can be obtained by calling
27 * isl_val_n_abs_num_chunks. The user is responsible for allocating
28 * enough memory to store the results.
30 * In the special case of a zero value, isl_val_n_abs_num_chunks will
31 * return one, while impz_export will not fill in any chunks. We therefore
32 * do it ourselves.
34 int isl_val_get_abs_num_chunks(__isl_keep isl_val *v, size_t size,
35 void *chunks)
37 isl_sioimath_scratchspace_t scratch;
39 if (!v || !chunks)
40 return -1;
42 if (!isl_val_is_rat(v))
43 isl_die(isl_val_get_ctx(v), isl_error_invalid,
44 "expecting rational value", return -1);
46 impz_export(chunks, NULL, -1, size, 0, 0,
47 isl_sioimath_bigarg_src(v->n, &scratch));
48 if (isl_val_is_zero(v))
49 memset(chunks, 0, size);
51 return 0;
54 /* Return the number of chunks of size "size" required to
55 * store the absolute value of the numerator of "v".
57 size_t isl_val_n_abs_num_chunks(__isl_keep isl_val *v, size_t size)
59 if (!v)
60 return 0;
62 if (!isl_val_is_rat(v))
63 isl_die(isl_val_get_ctx(v), isl_error_invalid,
64 "expecting rational value", return 0);
66 size *= 8;
67 return (isl_sioimath_sizeinbase(v->n, 2) + size - 1) / size;