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#include <string.h>
#include <isl/val_gmp.h>
#include <isl_val_private.h>
/* Return a reference to an isl_val representing the integer "z".
*/
__isl_give isl_val *isl_val_int_from_gmp(isl_ctx *ctx, mpz_t z)
{
isl_val *v;
v = isl_val_alloc(ctx);
if (!v)
return NULL;
isl_int_set(v->n, z);
isl_int_set_si(v->d, 1);
return v;
}
/* Return a reference to an isl_val representing the rational value "n"/"d".
*/
__isl_give isl_val *isl_val_from_gmp(isl_ctx *ctx, const mpz_t n, const mpz_t d)
{
isl_val *v;
v = isl_val_alloc(ctx);
if (!v)
return NULL;
isl_int_set(v->n, n);
isl_int_set(v->d, d);
return isl_val_normalize(v);
}
/* Extract the numerator of a rational value "v" in "z".
*
* If "v" is not a rational value, then the result is undefined.
*/
int isl_val_get_num_gmp(__isl_keep isl_val *v, mpz_t z)
{
if (!v)
return -1;
if (!isl_val_is_rat(v))
isl_die(isl_val_get_ctx(v), isl_error_invalid,
"expecting rational value", return -1);
mpz_set(z, v->n);
return 0;
}
/* Extract the denominator of a rational value "v" in "z".
*
* If "v" is not a rational value, then the result is undefined.
*/
int isl_val_get_den_gmp(__isl_keep isl_val *v, mpz_t z)
{
if (!v)
return -1;
if (!isl_val_is_rat(v))
isl_die(isl_val_get_ctx(v), isl_error_invalid,
"expecting rational value", return -1);
mpz_set(z, v->d);
return 0;
}
/* Return a reference to an isl_val representing the unsigned
* integer value stored in the "n" chunks of size "size" at "chunks".
* The least significant chunk is assumed to be stored first.
*/
__isl_give isl_val *isl_val_int_from_chunks(isl_ctx *ctx, size_t n,
size_t size, const void *chunks)
{
isl_val *v;
v = isl_val_alloc(ctx);
if (!v)
return NULL;
mpz_import(v->n, n, -1, size, 0, 0, chunks);
isl_int_set_si(v->d, 1);
return v;
}
/* Return the number of chunks of size "size" required to
* store the absolute value of the numerator of "v".
*/
isl_size isl_val_n_abs_num_chunks(__isl_keep isl_val *v, size_t size)
{
if (!v)
return isl_size_error;
if (!isl_val_is_rat(v))
isl_die(isl_val_get_ctx(v), isl_error_invalid,
"expecting rational value", return isl_size_error);
size *= 8;
return (mpz_sizeinbase(v->n, 2) + size - 1) / size;
}
/* Store a representation of the absolute value of the numerator of "v"
* in terms of chunks of size "size" at "chunks".
* The least significant chunk is stored first.
* The number of chunks in the result can be obtained by calling
* isl_val_n_abs_num_chunks. The user is responsible for allocating
* enough memory to store the results.
*
* In the special case of a zero value, isl_val_n_abs_num_chunks will
* return one, while mpz_export will not fill in any chunks. We therefore
* do it ourselves.
*/
isl_stat isl_val_get_abs_num_chunks(__isl_keep isl_val *v, size_t size,
void *chunks)
{
if (!v || !chunks)
return isl_stat_error;
if (!isl_val_is_rat(v))
isl_die(isl_val_get_ctx(v), isl_error_invalid,
"expecting rational value", return isl_stat_error);
mpz_export(chunks, NULL, -1, size, 0, 0, v->n);
if (isl_val_is_zero(v))
memset(chunks, 0, size);
return isl_stat_ok;
}
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