Find loop back edges only after empty blocks are eliminated.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61752 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp
index ff9d32c..125b076 100644
--- a/lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/lib/Transforms/Scalar/CodeGenPrepare.cpp
@@ -125,12 +125,13 @@
bool CodeGenPrepare::runOnFunction(Function &F) {
bool EverMadeChange = false;
- findLoopBackEdges(F);
-
// First pass, eliminate blocks that contain only PHI nodes and an
// unconditional branch.
EverMadeChange |= EliminateMostlyEmptyBlocks(F);
+ // Now find loop back edges.
+ findLoopBackEdges(F);
+
bool MadeChange = true;
while (MadeChange) {
MadeChange = false;