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Simplify RegPressure helpers. 

llvm-svn: 189122
This commit is contained in:
Andrew Trick 2013-08-23 17:48:48 +00:00
parent 86a7061e5d
commit 01bc216482
1 changed files with 12 additions and 15 deletions
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27
llvm/lib/CodeGen/RegisterPressure.cpp
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@ -25,16 +25,10 @@ using namespace llvm;
/// Increase pressure for each pressure set provided by TargetRegisterInfo.
static void increaseSetPressure(std::vector<unsigned> &CurrSetPressure,
std::vector<unsigned> &MaxSetPressure,
PSetIterator PSetI) {
unsigned Weight = PSetI.getWeight();
for (; PSetI.isValid(); ++PSetI) {
for (; PSetI.isValid(); ++PSetI)
CurrSetPressure[*PSetI] += Weight;
if (&CurrSetPressure != &MaxSetPressure
&& CurrSetPressure[*PSetI] > MaxSetPressure[*PSetI]) {
MaxSetPressure[*PSetI] = CurrSetPressure[*PSetI];
}
}
}
/// Decrease pressure for each pressure set provided by TargetRegisterInfo.
@ -87,8 +81,14 @@ void RegPressureTracker::dump() const {
/// the high water mark if needed.
void RegPressureTracker::increaseRegPressure(ArrayRef<unsigned> Regs) {
for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
increaseSetPressure(CurrSetPressure, P.MaxSetPressure,
MRI->getPressureSets(Regs[i]));
PSetIterator PSetI = MRI->getPressureSets(Regs[i]);
unsigned Weight = PSetI.getWeight();
for (; PSetI.isValid(); ++PSetI) {
CurrSetPressure[*PSetI] += Weight;
if (CurrSetPressure[*PSetI] > P.MaxSetPressure[*PSetI]) {
P.MaxSetPressure[*PSetI] = CurrSetPressure[*PSetI];
}
}
}
}
@ -281,8 +281,7 @@ void RegPressureTracker::initLiveThru(const RegPressureTracker &RPTracker) {
unsigned Reg = P.LiveOutRegs[i];
if (TargetRegisterInfo::isVirtualRegister(Reg)
&& !RPTracker.hasUntiedDef(Reg)) {
increaseSetPressure(LiveThruPressure, LiveThruPressure,
MRI->getPressureSets(Reg));
increaseSetPressure(LiveThruPressure, MRI->getPressureSets(Reg));
}
}
}
@ -366,8 +365,7 @@ void RegPressureTracker::discoverLiveIn(unsigned Reg) {
// At live in discovery, unconditionally increase the high water mark.
P.LiveInRegs.push_back(Reg);
increaseSetPressure(P.MaxSetPressure, P.MaxSetPressure,
MRI->getPressureSets(Reg));
increaseSetPressure(P.MaxSetPressure, MRI->getPressureSets(Reg));
}
/// Add Reg to the live out set and increase max pressure.
@ -378,8 +376,7 @@ void RegPressureTracker::discoverLiveOut(unsigned Reg) {
// At live out discovery, unconditionally increase the high water mark.
P.LiveOutRegs.push_back(Reg);
increaseSetPressure(P.MaxSetPressure, P.MaxSetPressure,
MRI->getPressureSets(Reg));
increaseSetPressure(P.MaxSetPressure, MRI->getPressureSets(Reg));
}
/// Recede across the previous instruction.