From 5c480432b504bfbe8b3ba028f5f48e7e2e2f1f1e Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Wed, 7 Jul 2010 21:18:22 +0000
Subject: [PATCH] Not all custom inserters create new basic blocks. If the
 inserter didn't create a new block, don't reset the insert position.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107813 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/InstrEmitter.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index f36620c3edf..5f93e2fcb2e 100644
--- a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -732,8 +732,11 @@ EmitMachineNode(SDNode *Node, bool IsClone, bool IsCloned,
   if (II.usesCustomInsertionHook()) {
     // Insert this instruction into the basic block using a target
     // specific inserter which may returns a new basic block.
-    MBB = TLI->EmitInstrWithCustomInserter(MI, MBB);
-    InsertPos = MBB->end();
+    MachineBasicBlock *NewMBB = TLI->EmitInstrWithCustomInserter(MI, MBB);
+    if (NewMBB != MBB) {
+      MBB = NewMBB;
+      InsertPos = NewMBB->end();
+    }
     return;
   }