Blocks that cond-br and uncond-br/fallthrough to same block should have

only one successor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37324 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index 6c632c2aee3e3e86f1d5c0d81a0f648deec0b68d..1fe2962a365ca3d8df20bbd0ed92d3dc41897404 100644 (file)
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -672,7 +672,10 @@ static bool CorrectExtraCFGEdges(MachineBasicBlock &MBB,
   
   MachineBasicBlock::pred_iterator SI = MBB.succ_begin();
   while (SI != MBB.succ_end()) {
-    if (*SI == DestA) {
+    if (*SI == DestA && DestA == DestB) {
+      DestA = DestB = 0;
+      ++SI;
+    } else if (*SI == DestA) {
       DestA = 0;
       ++SI;
     } else if (*SI == DestB) {