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/InstCombine/InstCombineAddSub.cpp

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index ac7eac9..03fd35f 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -876,7 +876,7 @@
       uint32_t BitWidth = cast<IntegerType>(V->getType())->getBitWidth();
       uint32_t CSTVal = CST->getLimitedValue(BitWidth);
       CST = ConstantInt::get(V->getType()->getContext(),
-                             APInt(BitWidth, 1).shl(CSTVal));
+                             APInt::getOneBitSet(BitWidth, CSTVal));
       return I->getOperand(0);
     }
   return 0;