From e251b1529f40131ce5931420448a1e847f42e4af Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Thu, 18 Sep 2008 18:22:32 +0000
Subject: Don't consider instructions with implicit physical register defs to
 be necessarily live.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56310 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/DeadMachineInstructionElim.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

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

diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp
index a3bba61e4a..8b9cf05d67 100644
--- a/lib/CodeGen/DeadMachineInstructionElim.cpp
+++ b/lib/CodeGen/DeadMachineInstructionElim.cpp
@@ -64,7 +64,8 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
           const MachineOperand &MO = MI->getOperand(i);
           if (MO.isRegister() && MO.isDef()) {
             unsigned Reg = MO.getReg();
-            if (TargetRegisterInfo::isPhysicalRegister(Reg) ||
+            if ((!MO.isImplicit() &&
+                 TargetRegisterInfo::isPhysicalRegister(Reg)) ||
                 !MRI.use_empty(Reg)) {
               // This def has a use. Don't delete the instruction!
               AllDefsDead = false;
-- 
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