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mruby-bigint (mrb_bint_sub_n): avoid allocating mpz_z

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2024-11-04 23:03:47 +09:00
parent 6085ffb968
commit fed631c21b
1 changed files with 15 additions and 1 deletions
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mrbgems/mruby-bigint/core/bigint.c
+15 -1
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@@ -1526,8 +1526,22 @@ mrb_bint_sub_n(mrb_state *mrb, mrb_value x, mrb_value y)
{
mpz_t a, b, z;
y = mrb_as_bint(mrb, y);
bint_as_mpz(RBIGINT(x), &a);
if (mrb_integer_p(y)) {
mrb_int i = mrb_integer(y);
if (LOW(i) == i) {
mpz_init_set(mrb, &z, &a);
if ((i > 0) ^ (z.sn > 0)) {
mpz_add_int(mrb, &z, i);
}
else {
mpz_sub_int(mrb, &z, i);
}
struct RBigint *v = bint_new(mrb, &z);
return mrb_obj_value(v);
}
}
y = mrb_as_bint(mrb, y);
bint_as_mpz(RBIGINT(y), &b);
mpz_init(mrb, &z);
mpz_sub(mrb, &z, &a, &b);