Remove redundant code in InstCombineShift, no functionality change because instsimpli...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211250 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/InstCombine/InstCombineShifts.cpp b/lib/Transforms/InstCombine/InstCombineShifts.cpp
index cc6665c947d768c78aab4ed5320023890e2af8ec..2495747da5fe6321fce069fed8915009ccaea352 100644 (file)
--- a/lib/Transforms/InstCombine/InstCombineShifts.cpp
+++ b/lib/Transforms/InstCombine/InstCombineShifts.cpp
@@ -789,11 +789,6 @@ Instruction *InstCombiner::visitAShr(BinaryOperator &I) {
     // have a sign-extend idiom.
     Value *X;
     if (match(Op0, m_Shl(m_Value(X), m_Specific(Op1)))) {
-      // If the left shift is just shifting out partial signbits, delete the
-      // extension.
-      if (cast<OverflowingBinaryOperator>(Op0)->hasNoSignedWrap())
-        return ReplaceInstUsesWith(I, X);
-
       // If the input is an extension from the shifted amount value, e.g.
       //   %x = zext i8 %A to i32
       //   %y = shl i32 %x, 24