From 6065f66e7c3fbde299a387d8a42c2d3a57d13c38 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 7 Dec 2006 00:46:04 +0000
Subject: [PATCH] getOperandConstraint returns -1 if the operand does have the
 specific constraint. This bug was causing excessive spills.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32295 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/VirtRegMap.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index 359294d18e4..60a773b3b03 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -97,7 +97,7 @@ void VirtRegMap::virtFolded(unsigned VirtReg, MachineInstr *OldMI,
   }
 
   ModRef MRInfo;
-  if (TII.getOperandConstraint(OldMI->getOpcode(), OpNo, TOI::TIED_TO)) {
+  if (TII.getOperandConstraint(OldMI->getOpcode(), OpNo, TOI::TIED_TO) != -1) {
     // Folded a two-address operand.
     MRInfo = isModRef;
   } else if (OldMI->getOperand(OpNo).isDef()) {