From 6ab52a8018cfd5df77c39fade8ac5cc74aff6792 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Wed, 17 Sep 2008 15:25:49 +0000
Subject: Don't worry about clobbering physical register defs that aren't used.

llvm-svn: 56281
---
 llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp')

diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
index b9dcc25dc75..0cf155ea4d4 100644
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -1709,6 +1709,8 @@ static bool canClobberPhysRegDefs(const SUnit *SuccSU, const SUnit *SU,
     MVT VT = N->getValueType(i);
     if (VT == MVT::Flag || VT == MVT::Other)
       continue;
+    if (!N->hasAnyUseOfValue(i))
+      continue;
     unsigned Reg = ImpDefs[i - NumDefs];
     for (;*SUImpDefs; ++SUImpDefs) {
       unsigned SUReg = *SUImpDefs;
-- 
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