Avoid infinite loop on negative exponent; fix
@@ -60,26 +60,23 @@ num_pow(mrb_state *mrb, mrb_value x)
mrb_int base = mrb_fixnum(x);
mrb_int exp = mrb_fixnum(y);
mrb_int result = 1;
- mrb_bool ok = TRUE;
+ if (exp < 0) goto float_pow;
for (;;) {
if (exp & 1) {
if (mrb_int_mul_overflow(result, base, &result)) {
- ok = FALSE;
- break;
+ goto float_pow;
}
}
exp >>= 1;
if (exp == 0) break;
if (mrb_int_mul_overflow(base, base, &base)) {
- ok = FALSE;
- break;
+ goto float_pow;
}
}
- if (ok) {
return mrb_fixnum_value(result);
}
- }
+ float_pow:
d = pow(mrb_to_flo(mrb, x), mrb_to_flo(mrb, y));
return mrb_float_value(mrb, d);
}
