[PATCH] D155404: [SimplifyCFG] Adjust sinking strategy for conditional predecessors.

[DianQK via Phabricator via llvm-commits]

DianQK created this revision.
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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155404

Files:
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp


Index: llvm/lib/Transforms/Utils/SimplifyCFG.cpp
===================================================================
--- llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -2251,7 +2251,7 @@
   bool Changed = false;
 
   if (HaveNonUnconditionalPredecessors) {
-    if (!followedByDeoptOrUnreachable) {
+    if (!followedByDeoptOrUnreachable && ScanIdx < 2) {
       // It is always legal to sink common instructions from unconditional
       // predecessors. However, if not all predecessors are unconditional,
       // this transformation might be pessimizing. So as a rule of thumb,


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