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MachineScheduler: Ignore COPYs with undef/dead op in CopyConstrain mutation. 

There is no problem with the code today, but the fix will avoid a crash
in test/CodeGen/AMDGPU/subreg-coalescer-undef-use.ll once the
DetectDeadLanes pass is added.

llvm-svn: 265351
This commit is contained in:
Matthias Braun 2016-04-04 21:23:46 +00:00
parent 571e3481e7
commit 7511abd5c1
1 changed files with 6 additions and 4 deletions
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10
llvm/lib/CodeGen/MachineScheduler.cpp
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@ -1580,12 +1580,14 @@ void CopyConstrain::constrainLocalCopy(SUnit *CopySU, ScheduleDAGMILive *DAG) {
MachineInstr *Copy = CopySU->getInstr();
// Check for pure vreg copies.
unsigned SrcReg = Copy->getOperand(1).getReg();
if (!TargetRegisterInfo::isVirtualRegister(SrcReg))
const MachineOperand &SrcOp = Copy->getOperand(1);
unsigned SrcReg = SrcOp.getReg();
if (!TargetRegisterInfo::isVirtualRegister(SrcReg) || !SrcOp.readsReg())
return;
unsigned DstReg = Copy->getOperand(0).getReg();
if (!TargetRegisterInfo::isVirtualRegister(DstReg))
const MachineOperand &DstOp = Copy->getOperand(0);
unsigned DstReg = DstOp.getReg();
if (!TargetRegisterInfo::isVirtualRegister(DstReg) || DstOp.isDead())
return;
// Check if either the dest or source is local. If it's live across a back