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InstCombine: Use the InstSimplify hook for shufflevector 

Summary: Start using the recently added InstSimplify hook for shuffles in the respective InstCombine visitor.

Reviewers: spatel, RKSimon, craig.topper, majnemer

Reviewed By: majnemer

Subscribers: majnemer, llvm-commits

Differential Revision: https://reviews.llvm.org/D31526

llvm-svn: 299412
This commit is contained in:
Zvi Rackover 2017-04-04 04:47:57 +00:00
parent 61329522af
commit 82bf48d8b9
1 changed files with 4 additions and 5 deletions
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9
llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
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@ -1140,12 +1140,11 @@ Instruction *InstCombiner::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
SmallVector<int, 16> Mask = SVI.getShuffleMask();
Type *Int32Ty = Type::getInt32Ty(SVI.getContext());
if (auto *V = SimplifyShuffleVectorInst(LHS, RHS, SVI.getMask(),
SVI.getType(), DL, &TLI, &DT, &AC))
return replaceInstUsesWith(SVI, V);
bool MadeChange = false;
// Undefined shuffle mask -> undefined value.
if (isa<UndefValue>(SVI.getOperand(2)))
return replaceInstUsesWith(SVI, UndefValue::get(SVI.getType()));
unsigned VWidth = SVI.getType()->getVectorNumElements();
APInt UndefElts(VWidth, 0);