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mi-sched: register pressure update tracing. 

llvm-svn: 190178
This commit is contained in:
Andrew Trick 2013-09-06 17:32:39 +00:00
parent ddffae9027
commit ffdbefb90c
1 changed files with 4 additions and 0 deletions
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4
llvm/lib/CodeGen/MachineScheduler.cpp
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@ -577,8 +577,10 @@ void ScheduleDAGMI::updatePressureDiffs(ArrayRef<unsigned> LiveUses) {
for (unsigned LUIdx = 0, LUEnd = LiveUses.size(); LUIdx != LUEnd; ++LUIdx) {
/// FIXME: Currently assuming single-use physregs.
unsigned Reg = LiveUses[LUIdx];
DEBUG(dbgs() << " LiveReg: " << PrintVRegOrUnit(Reg, TRI) << "\n");
if (!TRI->isVirtualRegister(Reg))
continue;
// This may be called before CurrentBottom has been initialized. However,
// BotRPTracker must have a valid position. We want the value live into the
// instruction or live out of the block, so ask for the previous
@ -598,6 +600,8 @@ void ScheduleDAGMI::updatePressureDiffs(ArrayRef<unsigned> LiveUses) {
for (VReg2UseMap::iterator
UI = VRegUses.find(Reg); UI != VRegUses.end(); ++UI) {
SUnit *SU = UI->SU;
DEBUG(dbgs() << " UpdateRegP: SU(" << SU->NodeNum << ") "
<< *SU->getInstr());
// If this use comes before the reaching def, it cannot be a last use, so
// descrease its pressure change.
if (!SU->isScheduled && SU != &ExitSU) {