commit fc3ea6f4bcb227bf0b77c560b37210fd86d0cea3
author Benjamin Kramer <benny.kra@googlemail.com> Thu Jul 11 16:05:50 2013 +0000
committer Benjamin Kramer <benny.kra@googlemail.com> Thu Jul 11 16:05:50 2013 +0000
tree ea6c81c137585709ba62cda622e44f33409c33e1
parent ce2c84e6709898ecd2836462660fd573d271c255

Don't use a potentially expensive shift if all we want is one set bit.

No functionality change.

llvm-svn: 186095

llvm/lib/Transforms/Utils/SimplifyIndVar.cpp

diff --git a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
index 41c207c..bf3442a 100644
--- a/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
@@ -119,7 +119,7 @@
         return 0;
 
       D = ConstantInt::get(UseInst->getContext(),
-                           APInt(BitWidth, 1).shl(D->getZExtValue()));
+                           APInt::getOneBitSet(BitWidth, D->getZExtValue()));
     }
     FoldedExpr = SE->getUDivExpr(SE->getSCEV(IVSrc), SE->getSCEV(D));
   }