From 39834da697e5a6d0198a6a802133ce351c871904 Mon Sep 17 00:00:00 2001
From: Manman Ren <mren@apple.com>
Date: Tue, 27 Nov 2012 18:58:41 +0000
Subject: CSE: allow PerformTrivialCoalescing to check copies across basic
 block boundaries.

Given the following case:
BB0
  %vreg1<def> = SUBrr %vreg0, %vreg7
  %vreg2<def> = COPY %vreg7
BB1
  %vreg10<def> = SUBrr %vreg0, %vreg2
We should be able to CSE between SUBrr in BB0 and SUBrr in BB1.

rdar://12462006


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168717 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/MachineCSE.cpp | 2 --
 1 file changed, 2 deletions(-)

(limited to 'lib/CodeGen/MachineCSE.cpp')

diff --git a/lib/CodeGen/MachineCSE.cpp b/lib/CodeGen/MachineCSE.cpp
index dbc41defeb..56cea4e599 100644
--- a/lib/CodeGen/MachineCSE.cpp
+++ b/lib/CodeGen/MachineCSE.cpp
@@ -126,8 +126,6 @@ bool MachineCSE::PerformTrivialCoalescing(MachineInstr *MI,
       // deleted.
       continue;
     MachineInstr *DefMI = MRI->getVRegDef(Reg);
-    if (DefMI->getParent() != MBB)
-      continue;
     if (!DefMI->isCopy())
       continue;
     unsigned SrcReg = DefMI->getOperand(1).getReg();
-- 
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