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[AMDGPU] Fix #115505

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[AMDGPU] Fix #115505

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11 changes: 10 additions & 1 deletion llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -59,9 +59,18 @@ static MCRegister findScratchNonCalleeSaveRegister(
if (Unused)
return findUnusedRegister(MRI, LiveUnits, RC);

dbgs() << "--------\n";

for (MCRegister Reg : RC) {
if (LiveUnits.available(Reg) && !MRI.isReserved(Reg))
dbgs() << "reg " << Reg << " avail? " << LiveUnits.available(Reg)
<< ", reserved? " << MRI.isReserved(Reg) << "\n";
}

for (MCRegister Reg : RC) {
if (LiveUnits.available(Reg) && !MRI.isReserved(Reg)) {
dbgs() << "--------choose reg " << Reg << '\n';
return Reg;
}
}

return MCRegister();
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