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Fix type of shuffle resulted from shuffle merge.

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This fix resolves PR19730.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208666 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Serge Pavlov 2014-05-13 06:07:21 +00:00
parent e2b37447b7
commit 51a167d6c4
2 changed files with 12 additions and 6 deletions
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10
lib/Transforms/InstCombine/InstCombineVectorOps.cpp
View File

@ -1114,12 +1114,10 @@ Instruction *InstCombiner::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
// If the result mask is an identity, replace uses of this instruction with
// corresponding argument.
if (VWidth == LHSWidth) {
bool isLHSID, isRHSID;
RecognizeIdentityMask(newMask, isLHSID, isRHSID);
if (isLHSID) return ReplaceInstUsesWith(SVI, newLHS);
if (isRHSID) return ReplaceInstUsesWith(SVI, newRHS);
}
bool isLHSID, isRHSID;
RecognizeIdentityMask(newMask, isLHSID, isRHSID);
if (isLHSID && VWidth == LHSOp0Width) return ReplaceInstUsesWith(SVI, newLHS);
if (isRHSID && VWidth == RHSOp0Width) return ReplaceInstUsesWith(SVI, newRHS);
return MadeChange ? &SVI : nullptr;
}

8
test/Transforms/InstCombine/vec_shuffle.ll
View File

@ -386,3 +386,11 @@ define <4 x i16> @pr19717a(<8 x i16> %in0, <8 x i16> %in1) {
%mul = mul <4 x i16> %shuffle, %shuffle1
ret <4 x i16> %mul
}
define <8 x i8> @pr19730(<16 x i8> %in0) {
; CHECK-LABEL: @pr19730(
; CHECK: shufflevector
%shuffle = shufflevector <16 x i8> %in0, <16 x i8> undef, <8 x i32> <i32 7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0>
%shuffle1 = shufflevector <8 x i8> %shuffle, <8 x i8> undef, <8 x i32> <i32 7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0>
ret <8 x i8> %shuffle1
}