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Merge pull request #462 from lioncash/undef

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{common/fp, backend/x64}: Prevent undefined left shifts where applicable
This commit is contained in:
Merry 2019-04-02 17:22:35 +01:00 committed by MerryMage
commit 0de471fc1a
2 changed files with 4 additions and 3 deletions
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2
src/backend/x64/emit_x64_vector.cpp
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@ -3838,7 +3838,7 @@ static bool VectorSignedSaturatedShiftLeft(VectorArray<T>& dst, const VectorArra
dst[i] = saturate(element); dst[i] = saturate(element);
qc_flag = true; qc_flag = true;
} else { } else {
const T shifted = element << shift; const T shifted = T(U(element) << shift);
if ((shifted >> shift) != element) { if ((shifted >> shift) != element) {
dst[i] = saturate(element); dst[i] = saturate(element);

5
src/common/fp/op/FPRecipExponent.cpp
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@ -48,8 +48,9 @@ FPT FPRecipExponent(FPT op, FPCR fpcr, FPSR& fpsr) {
} }
// Infinities and normals // Infinities and normals
const auto negated_exponent = (~exponent << FPInfo<FPT>::explicit_mantissa_width) & FPInfo<FPT>::exponent_mask; const FPT negated_exponent = FPT(~exponent);
return FPT(sign_bits | negated_exponent); const FPT adjusted_exponent = FPT(negated_exponent << FPInfo<FPT>::explicit_mantissa_width) & FPInfo<FPT>::exponent_mask;
return FPT(sign_bits | adjusted_exponent);
} }
template u16 FPRecipExponent<u16>(u16 op, FPCR fpcr, FPSR& fpsr); template u16 FPRecipExponent<u16>(u16 op, FPCR fpcr, FPSR& fpsr);