commit e251b1529f40131ce5931420448a1e847f42e4af
author Dan Gohman <gohman@apple.com> Thu Sep 18 18:22:32 2008 +0000
committer Dan Gohman <gohman@apple.com> Thu Sep 18 18:22:32 2008 +0000
tree d2621719bc0cfb8a7ee93ace05464e4dd6387257
parent 6a0fd93547ec6d08f767e9315a8565cf1abb356f

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

diff --git a/lib/CodeGen/DeadMachineInstructionElim.cpp b/lib/CodeGen/DeadMachineInstructionElim.cpp
index a3bba61..8b9cf05 100644
--- a/lib/CodeGen/DeadMachineInstructionElim.cpp
+++ b/lib/CodeGen/DeadMachineInstructionElim.cpp
@@ -64,7 +64,8 @@
           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;