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Correct register pressure calculation in presence of subregs

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If a subreg is used in an instruction it counts as a whole superreg
for the purpose of register pressure calculation. This patch corrects
improper register pressure calculation by examining operand's lane mask.

Differential Revision: https://reviews.llvm.org/D29835

llvm-svn: 296009
This commit is contained in:
Stanislav Mekhanoshin
2017-02-23 20:19:44 +00:00
parent 851125dca9
commit ce3ddd2de4
9 changed files with 153 additions and 30 deletions
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4
llvm/lib/CodeGen/MachineScheduler.cpp
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@@ -1085,7 +1085,7 @@ void ScheduleDAGMILive::updatePressureDiffs(
continue;
PressureDiff &PDiff = getPressureDiff(&SU);
PDiff.addPressureChange(Reg, Decrement, &MRI);
PDiff.addPressureChange(P, Decrement, &MRI);
DEBUG(
dbgs() << " UpdateRegP: SU(" << SU.NodeNum << ") "
<< PrintReg(Reg, TRI) << ':' << PrintLaneMask(P.LaneMask)
@@ -1123,7 +1123,7 @@ void ScheduleDAGMILive::updatePressureDiffs(
LI.Query(LIS->getInstructionIndex(*SU->getInstr()));
if (LRQ.valueIn() == VNI) {
PressureDiff &PDiff = getPressureDiff(SU);
PDiff.addPressureChange(Reg, true, &MRI);
PDiff.addPressureChange(P, true, &MRI);
DEBUG(
dbgs() << " UpdateRegP: SU(" << SU->NodeNum << ") "
<< *SU->getInstr();