[llvm] r335233 - [CodeGen] Avoid handling DBG_VALUE in LiveRegUnits::stepBackward

[Krzysztof Parzyszek via llvm-commits]

Author: kparzysz
Date: Thu Jun 21 06:38:43 2018
New Revision: 335233

URL: http://llvm.org/viewvc/llvm-project?rev=335233&view=rev
Log:
[CodeGen] Avoid handling DBG_VALUE in LiveRegUnits::stepBackward

Patch by Jesper Antonsson.

Differential Revision: https://reviews.llvm.org/D48420

Modified:
    llvm/trunk/lib/CodeGen/LiveRegUnits.cpp

Modified: llvm/trunk/lib/CodeGen/LiveRegUnits.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveRegUnits.cpp?rev=335233&r1=335232&r2=335233&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveRegUnits.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveRegUnits.cpp Thu Jun 21 06:38:43 2018
@@ -46,7 +46,7 @@ void LiveRegUnits::stepBackward(const Ma
   // Remove defined registers and regmask kills from the set.
   for (ConstMIBundleOperands O(MI); O.isValid(); ++O) {
     if (O->isReg()) {
-      if (!O->isDef())
+      if (!O->isDef() || O->isDebug())
         continue;
       unsigned Reg = O->getReg();
       if (!TargetRegisterInfo::isPhysicalRegister(Reg))
@@ -58,7 +58,7 @@ void LiveRegUnits::stepBackward(const Ma
 
   // Add uses to the set.
   for (ConstMIBundleOperands O(MI); O.isValid(); ++O) {
-    if (!O->isReg() || !O->readsReg())
+    if (!O->isReg() || !O->readsReg() || O->isDebug())
       continue;
     unsigned Reg = O->getReg();
     if (!TargetRegisterInfo::isPhysicalRegister(Reg))