From: Matthias Braun <matze@braunis.de>
Date: Tue, 24 Nov 2015 20:06:56 +0000 (+0000)
Subject: LiveVariables should not clobber MachineOperand::IsDead, ::IsKill on reserved physica... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1bb03c5884405c428c3ab54631c0528b6cedeb54;p=oota-llvm.git

LiveVariables should not clobber MachineOperand::IsDead, ::IsKill on reserved physical registers

Patch by Nick Johnson <Nicholas.Paul.Johnson@deshawresearch.com>

Differential Revision: http://reviews.llvm.org/D14875

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254012 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp
index 007f4eb1ae3..06b86d82daf 100644
--- a/lib/CodeGen/LiveVariables.cpp
+++ b/lib/CodeGen/LiveVariables.cpp
@@ -522,11 +522,15 @@ void LiveVariables::runOnInstr(MachineInstr *MI,
       continue;
     unsigned MOReg = MO.getReg();
     if (MO.isUse()) {
-      MO.setIsKill(false);
+      if (!(TargetRegisterInfo::isPhysicalRegister(MOReg) &&
+            MRI->isReserved(MOReg)))
+        MO.setIsKill(false);
       if (MO.readsReg())
         UseRegs.push_back(MOReg);
     } else /*MO.isDef()*/ {
-      MO.setIsDead(false);
+      if (!(TargetRegisterInfo::isPhysicalRegister(MOReg) &&
+            MRI->isReserved(MOReg)))
+        MO.setIsDead(false);
       DefRegs.push_back(MOReg);
     }
   }