[PATCH] D125857: [InstCombine] [NFC] Use a pattern matcher for ExtractElementInst.

[Chenbing.Zheng via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGcf348f6a2cac: [InstCombine] [NFC] Use a pattern matcher for ExtractElementInst (authored by Chenbing.Zheng).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D125857/new/

https://reviews.llvm.org/D125857

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp


Index: llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -2350,9 +2350,9 @@
 /// usually not type-specific like scalar integer or scalar floating-point.
 static Instruction *canonicalizeBitCastExtElt(BitCastInst &BitCast,
                                               InstCombinerImpl &IC) {
-  // TODO: Create and use a pattern matcher for ExtractElementInst.
-  auto *ExtElt = dyn_cast<ExtractElementInst>(BitCast.getOperand(0));
-  if (!ExtElt || !ExtElt->hasOneUse())
+  Value *VecOp, *Index;
+  if (!match(BitCast.getOperand(0),
+             m_OneUse(m_ExtractElt(m_Value(VecOp), m_Value(Index)))))
     return nullptr;
 
   // The bitcast must be to a vectorizable type, otherwise we can't make a new
@@ -2361,10 +2361,10 @@
   if (!VectorType::isValidElementType(DestType))
     return nullptr;
 
-  auto *NewVecType = VectorType::get(DestType, ExtElt->getVectorOperandType());
-  auto *NewBC = IC.Builder.CreateBitCast(ExtElt->getVectorOperand(),
-                                         NewVecType, "bc");
-  return ExtractElementInst::Create(NewBC, ExtElt->getIndexOperand());
+  auto *NewVecType =
+      VectorType::get(DestType, cast<VectorType>(VecOp->getType()));
+  auto *NewBC = IC.Builder.CreateBitCast(VecOp, NewVecType, "bc");
+  return ExtractElementInst::Create(NewBC, Index);
 }
 
 /// Change the type of a bitwise logic operation if we can eliminate a bitcast.


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