[PATCH] D31526: InstCombine: Use the InstSimplify hook for shufflevector
Zvi Rackover via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Fri Mar 31 01:58:43 PDT 2017
zvi updated this revision to Diff 93604.
zvi added a comment.
Move above the declaration of MadeChange
Repository:
rL LLVM
https://reviews.llvm.org/D31526
Files:
lib/Transforms/InstCombine/InstCombineVectorOps.cpp
Index: lib/Transforms/InstCombine/InstCombineVectorOps.cpp
===================================================================
--- lib/Transforms/InstCombine/InstCombineVectorOps.cpp
+++ lib/Transforms/InstCombine/InstCombineVectorOps.cpp
@@ -1140,12 +1140,11 @@
SmallVector<int, 16> Mask = SVI.getShuffleMask();
Type *Int32Ty = Type::getInt32Ty(SVI.getContext());
- bool MadeChange = false;
-
- // Undefined shuffle mask -> undefined value.
- if (isa<UndefValue>(SVI.getOperand(2)))
- return replaceInstUsesWith(SVI, UndefValue::get(SVI.getType()));
+ if (auto *V = SimplifyShuffleVectorInst(LHS, RHS, SVI.getMask(),
+ SVI.getType(), DL, &TLI, &DT, &AC))
+ return replaceInstUsesWith(SVI, V);
+ bool MadeChange = false;
unsigned VWidth = SVI.getType()->getVectorNumElements();
APInt UndefElts(VWidth, 0);
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