From 0011dc4738fbe624d44197ef9496517fd093eaa4 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Sat, 21 Jun 2008 20:21:19 +0000
Subject: [PATCH] Use MachineBasicBlock::transferSuccessors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52594 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Alpha/AlphaISelLowering.cpp |  6 +-----
 lib/Target/PowerPC/PPCISelLowering.cpp | 11 +++--------
 lib/Target/Sparc/SparcISelLowering.cpp | 11 +++--------
 3 files changed, 7 insertions(+), 21 deletions(-)

diff --git a/lib/Target/Alpha/AlphaISelLowering.cpp b/lib/Target/Alpha/AlphaISelLowering.cpp
index 86fc4886fdb..dd001b4f168 100644
--- a/lib/Target/Alpha/AlphaISelLowering.cpp
+++ b/lib/Target/Alpha/AlphaISelLowering.cpp
@@ -662,11 +662,7 @@ AlphaTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
   MachineBasicBlock *llscMBB = new MachineBasicBlock(LLVM_BB);
   MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
 
-  for(MachineBasicBlock::succ_iterator i = thisMBB->succ_begin(), 
-        e = thisMBB->succ_end(); i != e; ++i)
-    sinkMBB->addSuccessor(*i);
-  while(!thisMBB->succ_empty())
-    thisMBB->removeSuccessor(thisMBB->succ_begin());
+  sinkMBB->transferSuccessors(thisMBB);
 
   MachineFunction *F = BB->getParent();
   F->getBasicBlockList().insert(It, llscMBB);
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp
index beb03d0e598..000cfc3f2cd 100644
--- a/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -4018,15 +4018,10 @@ PPCTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
   MachineFunction *F = BB->getParent();
   F->getBasicBlockList().insert(It, copy0MBB);
   F->getBasicBlockList().insert(It, sinkMBB);
-  // Update machine-CFG edges by first adding all successors of the current
+  // Update machine-CFG edges by transferring all successors of the current
   // block to the new block which will contain the Phi node for the select.
-  for(MachineBasicBlock::succ_iterator i = BB->succ_begin(), 
-      e = BB->succ_end(); i != e; ++i)
-    sinkMBB->addSuccessor(*i);
-  // Next, remove all successors of the current block, and add the true
-  // and fallthrough blocks as its successors.
-  while(!BB->succ_empty())
-    BB->removeSuccessor(BB->succ_begin());
+  sinkMBB->transferSuccessors(BB);
+  // Next, add the true and fallthrough blocks as its successors.
   BB->addSuccessor(copy0MBB);
   BB->addSuccessor(sinkMBB);
   
diff --git a/lib/Target/Sparc/SparcISelLowering.cpp b/lib/Target/Sparc/SparcISelLowering.cpp
index 89172fcb527..5c0617438c4 100644
--- a/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/lib/Target/Sparc/SparcISelLowering.cpp
@@ -920,15 +920,10 @@ SparcTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
   MachineFunction *F = BB->getParent();
   F->getBasicBlockList().insert(It, copy0MBB);
   F->getBasicBlockList().insert(It, sinkMBB);
-  // Update machine-CFG edges by first adding all successors of the current
+  // Update machine-CFG edges by transferring all successors of the current
   // block to the new block which will contain the Phi node for the select.
-  for(MachineBasicBlock::succ_iterator i = BB->succ_begin(), 
-      e = BB->succ_end(); i != e; ++i)
-    sinkMBB->addSuccessor(*i);
-  // Next, remove all successors of the current block, and add the true
-  // and fallthrough blocks as its successors.
-  while(!BB->succ_empty())
-    BB->removeSuccessor(BB->succ_begin());
+  sinkMBB->transferSuccessors(BB);
+  // Next, add the true and fallthrough blocks as its successors.
   BB->addSuccessor(copy0MBB);
   BB->addSuccessor(sinkMBB);