MC CFG: Don't insert preds/succs again.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188874 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/MC/MCFunction.cpp b/lib/MC/MCFunction.cpp
index 2665d3e167b6d065368ef8e109fc73cbe7e7d218..473d07bf9949de802599d4764463c8f656c68179 100644 (file)
--- a/lib/MC/MCFunction.cpp
+++ b/lib/MC/MCFunction.cpp
@@ -37,7 +37,8 @@ MCBasicBlock::MCBasicBlock(const MCTextAtom &Insts, MCFunction *Parent)
 {}
 
 void MCBasicBlock::addSuccessor(const MCBasicBlock *MCBB) {
-  Successors.push_back(MCBB);
+  if (!isSuccessor(MCBB))
+    Successors.push_back(MCBB);
 }
 
 bool MCBasicBlock::isSuccessor(const MCBasicBlock *MCBB) const {
@@ -46,7 +47,8 @@ bool MCBasicBlock::isSuccessor(const MCBasicBlock *MCBB) const {
 }
 
 void MCBasicBlock::addPredecessor(const MCBasicBlock *MCBB) {
-  Predecessors.push_back(MCBB);
+  if (!isPredecessor(MCBB))
+    Predecessors.push_back(MCBB);
 }
 
 bool MCBasicBlock::isPredecessor(const MCBasicBlock *MCBB) const {