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[CodeGen] Avoid handling DBG_VALUE in LiveRegUnits::stepBackward 

Patch by Jesper Antonsson.

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

llvm-svn: 335233
This commit is contained in:
Krzysztof Parzyszek 2018-06-21 13:38:43 +00:00
parent 15745ba5c1
commit 6a3229301f
1 changed files with 2 additions and 2 deletions
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4
llvm/lib/CodeGen/LiveRegUnits.cpp
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@ -46,7 +46,7 @@ void LiveRegUnits::stepBackward(const MachineInstr &MI) {
// 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 MachineInstr &MI) {
// 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))