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Bignum NOT operation

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Justin Ethier 2017-04-01 01:02:41 -04:00
parent 37a1d65980
commit 9162e36913
1 changed files with 13 additions and 5 deletions
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18
srfi/60.scm
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@ -121,13 +121,21 @@
(define-c lognot
"(void* data, int argc, closure _, object k, object x)"
"Cyc_check_int(data, x);
alloc_bignum(data, bn);
if (Cyc_is_bignum(x) == boolean_t) {
// uh oh, libtommath doesn't provide this!
Cyc_rt_raise_msg(data, \"bignum negation not supported yet\");
mp_copy(&bignum_value(x), &bignum_value(bn));
} else {
int result = ~((int)unbox_number(x));
return_closcall1(data, k, obj_int2obj(result));
}")
Cyc_int2bignum((int)unbox_number(x), &bignum_value(bn));
}
// From https://github.com/libtom/libtommath/issues/30
/* A one's complement, aka bitwise NOT, is actually just -a - 1 */
//CHECK_ERROR(mp_neg(&op->mp, &out->mp));
//CHECK_ERROR(mp_sub_d(&out->mp, 1, &out->mp));
mp_neg(&bignum_value(bn), &bignum_value(bn));
mp_sub_d(&bignum_value(bn), 1, &bignum_value(bn));
return_closcall1(data, k, Cyc_bignum_normalize(data, bn));
")
(define bitwise-not lognot)