[PM] Change LowerExpectIntrinsic to actually return true when it has

changed the IR. This is particularly easy as we can just look for the
existence of any expect intrinsic at all to know whether we've changed
the IR.

llvm-svn: 226998

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp b/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
index 5d3bbbc6047..0cea5c5bc59 100644
--- a/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
+++ b/llvm/lib/Transforms/Scalar/LowerExpectIntrinsic.cpp
@@ -144,6 +144,8 @@ static bool handleBranchExpect(BranchInst &BI) {
 }
 
 bool LowerExpectIntrinsic::runOnFunction(Function &F) {
+  bool Changed = false;
+
   for (BasicBlock &BB : F) {
     // Create "block_weights" metadata.
     if (BranchInst *BI = dyn_cast<BranchInst>(BB.getTerminator())) {
@@ -165,11 +167,12 @@ bool LowerExpectIntrinsic::runOnFunction(Function &F) {
         Value *Exp = CI->getArgOperand(0);
         CI->replaceAllUsesWith(Exp);
         CI->eraseFromParent();
+        Changed = true;
       }
     }
   }
 
-  return false;
+  return Changed;
 }
 
 char LowerExpectIntrinsic::ID = 0;