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Clean up Filler::runOnMachineBasicBlock. Change interface of

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Filler::findDelayInstr.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141150 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-10-05 01:23:39 +00:00
parent 98f4d4d2db
commit 6f818abbe3
1 changed files with 20 additions and 17 deletions
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37
lib/Target/Mips/MipsDelaySlotFiller.cpp
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@ -78,8 +78,9 @@ namespace {
SmallSet<unsigned, 32> &RegDefs,
SmallSet<unsigned, 32> &RegUses);
MachineBasicBlock::iterator
findDelayInstr(MachineBasicBlock &MBB, MachineBasicBlock::iterator slot);
bool
findDelayInstr(MachineBasicBlock &MBB, MachineBasicBlock::iterator slot,
MachineBasicBlock::iterator &Filler);
};
@ -93,19 +94,19 @@ runOnMachineBasicBlock(MachineBasicBlock &MBB) {
bool Changed = false;
for (MachineBasicBlock::iterator I = MBB.begin(); I != MBB.end(); ++I)
if (I->getDesc().hasDelaySlot()) {
MachineBasicBlock::iterator D = MBB.end();
MachineBasicBlock::iterator J = I;
if (EnableDelaySlotFiller)
D = findDelayInstr(MBB, I);
++FilledSlots;
Changed = true;
if (D == MBB.end())
BuildMI(MBB, ++J, I->getDebugLoc(), TII->get(Mips::NOP));
else
MBB.splice(++J, &MBB, D);
MachineBasicBlock::iterator D;
if (EnableDelaySlotFiller && findDelayInstr(MBB, I, D)) {
MBB.splice(llvm::next(I), &MBB, D);
++UsefulSlots;
}
else
BuildMI(MBB, llvm::next(I), I->getDebugLoc(), TII->get(Mips::NOP));
++I; // Skip instruction that has just been moved to delay slot.
}
return Changed;
@ -117,9 +118,9 @@ FunctionPass *llvm::createMipsDelaySlotFillerPass(MipsTargetMachine &tm) {
return new Filler(tm);
}
MachineBasicBlock::iterator
Filler::findDelayInstr(MachineBasicBlock &MBB,
MachineBasicBlock::iterator slot) {
bool Filler::findDelayInstr(MachineBasicBlock &MBB,
MachineBasicBlock::iterator slot,
MachineBasicBlock::iterator &Filler) {
SmallSet<unsigned, 32> RegDefs;
SmallSet<unsigned, 32> RegUses;
bool sawLoad = false;
@ -162,9 +163,11 @@ Filler::findDelayInstr(MachineBasicBlock &MBB,
continue;
}
return I;
Filler = I;
return true;
}
return MBB.end();
return false;
}
bool Filler::delayHasHazard(MachineBasicBlock::iterator candidate,