Avoid finding loop back edges when we are not splitting critical edges in
CodeGenPrepare (which is the default behavior).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122801 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp
index f4edcc7..8df0b3c 100644
--- a/lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/lib/Transforms/Scalar/CodeGenPrepare.cpp
@@ -119,8 +119,10 @@
// unconditional branch.
EverMadeChange |= EliminateMostlyEmptyBlocks(F);
- // Now find loop back edges.
- findLoopBackEdges(F);
+ // Now find loop back edges, but only if they are being used to decide which
+ // critical edges to split.
+ if (CriticalEdgeSplit)
+ findLoopBackEdges(F);
bool MadeChange = true;
while (MadeChange) {