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cxxrtl: Fix sdivmod

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x = x.neg(); results in the subsequent x.is_neg() always being false.
Ditto for the dividend.is_neg() != divisor.is_neg() test.
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Merry 2024-03-29 20:53:26 +00:00 • committed by Catherine
parent 0a854cf4ce
commit d07a55a852
2 changed files with 109 additions and 4 deletions
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8
backends/cxxrtl/runtime/cxxrtl/cxxrtl.h
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@ -625,11 +625,11 @@ struct value : public expr_base<value<Bits>> {
value<Bits + 1> remainder;
value<Bits + 1> dividend = sext<Bits + 1>();
value<Bits + 1> divisor = other.template sext<Bits + 1>();
if (dividend.is_neg()) dividend = dividend.neg();
if (divisor.is_neg()) divisor = divisor.neg();
if (is_neg()) dividend = dividend.neg();
if (other.is_neg()) divisor = divisor.neg();
std::tie(quotient, remainder) = dividend.udivmod(divisor);
if (dividend.is_neg() != divisor.is_neg()) quotient = quotient.neg();
if (dividend.is_neg()) remainder = remainder.neg();
if (is_neg() != other.is_neg()) quotient = quotient.neg();
if (is_neg()) remainder = remainder.neg();
return {quotient.template trunc<Bits>(), remainder.template trunc<Bits>()};
}
};