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backend/x64/emit_x64_vector: Prevent undefined behavior within VectorSignedSaturatedShiftLeft

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Avoids undefined behavior by potentially left-shifting a signed negative
value.
This commit is contained in:
Lioncash 2019-04-01 19:53:46 -04:00 committed by MerryMage
parent 46eae8cf2f
commit b37279f65c
1 changed files with 1 additions and 1 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);