Signed shr by a constant is not the same as sdiv by 2^k

llvm-svn: 27395

1 files changed, 0 insertions, 9 deletions

diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index f8b4ab9be13..f0848569ddb 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -1374,15 +1374,6 @@ SCEVHandle ScalarEvolutionsImpl::createSCEV(Value *V) {
       }
       break;
 
-    case Instruction::Shr:
-      if (ConstantUInt *SA = dyn_cast<ConstantUInt>(I->getOperand(1)))
-        if (V->getType()->isSigned()) {
-          Constant *X = ConstantInt::get(V->getType(), 1);
-          X = ConstantExpr::getShl(X, SA);
-          return SCEVSDivExpr::get(getSCEV(I->getOperand(0)), getSCEV(X));
-        }
-      break;
-
     case Instruction::Cast:
       return createNodeForCast(cast<CastInst>(I));