From b01bfd49c3353085e9ebb01d7b257f70583ee8c8 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 12 Aug 2005 21:58:07 +0000
Subject: [PATCH] Change break critical edges to not remove, then insert, PHI
 node entries. Instead, just update the BB in-place.  This is both faster, and
 it prevents split-critical-edges from shuffling the PHI argument list
 unneccesarily.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22765 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Utils/BreakCriticalEdges.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Transforms/Utils/BreakCriticalEdges.cpp b/lib/Transforms/Utils/BreakCriticalEdges.cpp
index acc1e2cd3f7..59ec01c7d58 100644
--- a/lib/Transforms/Utils/BreakCriticalEdges.cpp
+++ b/lib/Transforms/Utils/BreakCriticalEdges.cpp
@@ -124,8 +124,8 @@ bool llvm::SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum, Pass *P) {
     // We no longer enter through TIBB, now we come in through NewBB.  Revector
     // exactly one entry in the PHI node that used to come from TIBB to come
     // from NewBB.
-    Value *InVal = PN->removeIncomingValue(TIBB, false);
-    PN->addIncoming(InVal, NewBB);
+    int BBIdx = PN->getBasicBlockIndex(TIBB);
+    PN->setIncomingBlock(BBIdx, NewBB);
   }
 
   // If we don't have a pass object, we can't update anything...