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[x86] Switch to a formulation of a for loop that is much more obviously

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not corrupting the mask by mutating it more times than intended. No
functionality changed (the results were non-overlapping so the old
version "worked" but was non-obvious).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214953 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-08-06 10:16:33 +00:00
parent 2b9b50379b
commit 346b68772b
1 changed files with 4 additions and 3 deletions
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7
lib/Target/X86/X86ISelLowering.cpp
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@ -7519,9 +7519,10 @@ static SDValue lowerV8I16SingleInputVectorShuffle(
int FreeDWord = (PSHUFDMask[DestOffset / 2] == -1 ? 0 : 1) + DestOffset / 2;
assert(PSHUFDMask[FreeDWord] == -1 && "DWord not free");
PSHUFDMask[FreeDWord] = IncomingInputs[0] / 2;
for (int Input : IncomingInputs)
std::replace(HalfMask.begin(), HalfMask.end(), Input,
FreeDWord * 2 + Input % 2);
for (int &M : HalfMask)
for (int Input : IncomingInputs)
if (M == Input)
M = FreeDWord * 2 + Input % 2;
};
moveInputsToRightHalf(HToLInputs, LToLInputs, PSHUFHMask, LoMask,
/*SourceOffset*/ 4, /*DestOffset*/ 0);