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WIP - new version of libtommath

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Justin Ethier 2019-02-17 19:00:47 -05:00
parent 2e9a5bd9c2
commit b2b10ca729
2 changed files with 11 additions and 22 deletions
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2
include/cyclone/types.h
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@ -1378,7 +1378,7 @@ void **vpbuffer_add(void **buf, int *len, int i, void *obj);
void vpbuffer_free(void **buf);
/* Bignum utility functions */
double mp_get_double(mp_int *a);
double mp_get_double(const mp_int *a);
int Cyc_bignum_cmp(bn_cmp_type type, object x, int tx, object y, int ty);
void Cyc_int2bignum(int n, mp_int *bn);

31
runtime.c
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@ -1422,28 +1422,17 @@ object Cyc_num_cmp_va_list(void *data, int argc,
* Code is from: https://github.com/libtom/libtommath/issues/3
*/
#define PRECISION 53
double mp_get_double(mp_int *a)
double mp_get_double(const mp_int *a)
{
static const int NEED_DIGITS = (PRECISION + 2 * DIGIT_BIT - 2) / DIGIT_BIT;
static const double DIGIT_MULTI = (mp_digit)1 << DIGIT_BIT;
int i, limit;
double d = 0.0;
mp_clamp(a);
i = USED(a);
limit = i <= NEED_DIGITS ? 0 : i - NEED_DIGITS;
while (i-- > limit) {
d += DIGIT(a, i);
d *= DIGIT_MULTI;
}
if(SIGN(a) == MP_NEG)
d *= -1.0;
d *= pow(2.0, i * DIGIT_BIT);
return d;
int i;
double d = 0.0, fac = 1.0;
for (i = 0; i < DIGIT_BIT; ++i) {
fac *= 2.0;
}
for (i = a->used; i --> 0;) {
d = (d * fac) + (double)DIGIT(a, i);
}
return (a->sign == MP_NEG) ? -d : d;
}
// Convert a bignum back to fixnum if possible