Revert another incorrectly applied chunk, which fixes InstCombine/vec_insert_to_shuff...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33705 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 39841d6cee798a91301a309dff7c51f172e9bc20..a47ecd002316417bf7ab7b9eea1353c9017be4de 100644 (file)
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -8992,13 +8992,6 @@ Instruction *InstCombiner::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
     }
   }
 
-  // See if SimplifyDemandedVectorElts can simplify based on this shuffle.  For
-  // example, if this is a splat, then we only demand from one input element.
-  uint64_t UndefElts;
-  if (Value *V = SimplifyDemandedVectorElts(&SVI, (1ULL << Mask.size())-1,
-                                            UndefElts))
-    return ReplaceInstUsesWith(SVI, V);
-    
   return MadeChange ? &SVI : 0;
 }