Revert [InstCombine] fold a shifted bool zext to a select

This reverts r374828 (git commit 1f40f15d54aac06421448b6de131231d2d78bc75) due to bot breakage

llvm-svn: 374851

1 files changed, 0 insertions, 6 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp b/llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp
index 9187c70fb84..ca1885a6128 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineShifts.cpp
@@ -934,12 +934,6 @@ Instruction *InstCombiner::visitShl(BinaryOperator &I) {
     return BinaryOperator::CreateLShr(
         ConstantInt::get(Ty, APInt::getSignMask(BitWidth)), X);
 
-  // shl (zext (i1 X)), C1 --> select (X, 1 << C1, 0)
-  if (match(Op0, m_ZExt(m_Value(X))) && X->getType()->isIntOrIntVectorTy(1)) {
-    auto *NewC = ConstantExpr::getShl(ConstantInt::get(Ty, 1), C1);
-    return SelectInst::Create(X, NewC, ConstantInt::getNullValue(Ty));
-  }
-
   return nullptr;
 }