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[mips] Make Filler a class and reduce indentation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174666 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2013-02-07 21:32:32 +00:00
parent e0501e866c
commit 5dd41c95f3
1 changed files with 35 additions and 31 deletions
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66
lib/Target/Mips/MipsDelaySlotFiller.cpp
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@ -45,15 +45,8 @@ static cl::opt<bool> SkipDelaySlotFiller(
cl::Hidden);
namespace {
struct Filler : public MachineFunctionPass {
typedef MachineBasicBlock::instr_iterator InstrIter;
typedef MachineBasicBlock::reverse_instr_iterator ReverseInstrIter;
TargetMachine &TM;
const TargetInstrInfo *TII;
InstrIter LastFiller;
static char ID;
class Filler : public MachineFunctionPass {
public:
Filler(TargetMachine &tm)
: MachineFunctionPass(ID), TM(tm), TII(tm.getInstrInfo()) { }
@ -61,7 +54,6 @@ namespace {
return "Mips Delay Slot Filler";
}
bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
bool runOnMachineFunction(MachineFunction &F) {
if (SkipDelaySlotFiller)
return false;
@ -73,6 +65,12 @@ namespace {
return Changed;
}
private:
typedef MachineBasicBlock::instr_iterator InstrIter;
typedef MachineBasicBlock::reverse_instr_iterator ReverseInstrIter;
bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
bool isDelayFiller(MachineBasicBlock &MBB,
InstrIter candidate);
@ -96,7 +94,11 @@ namespace {
findDelayInstr(MachineBasicBlock &MBB, InstrIter slot,
InstrIter &Filler);
TargetMachine &TM;
const TargetInstrInfo *TII;
InstrIter LastFiller;
static char ID;
};
char Filler::ID = 0;
} // end of anonymous namespace
@ -108,31 +110,33 @@ runOnMachineBasicBlock(MachineBasicBlock &MBB) {
bool Changed = false;
LastFiller = MBB.instr_end();
for (InstrIter I = MBB.instr_begin(); I != MBB.instr_end(); ++I)
if (I->hasDelaySlot()) {
++FilledSlots;
Changed = true;
InstrIter InstrWithSlot = I;
InstrIter D;
for (InstrIter I = MBB.instr_begin(); I != MBB.instr_end(); ++I) {
if (!I->hasDelaySlot())
continue;
// Delay slot filling is disabled at -O0.
if (!DisableDelaySlotFiller && (TM.getOptLevel() != CodeGenOpt::None) &&
findDelayInstr(MBB, I, D)) {
MBB.splice(llvm::next(I), &MBB, D);
++UsefulSlots;
} else
BuildMI(MBB, llvm::next(I), I->getDebugLoc(), TII->get(Mips::NOP));
++FilledSlots;
Changed = true;
InstrIter InstrWithSlot = I;
InstrIter D;
// Record the filler instruction that filled the delay slot.
// The instruction after it will be visited in the next iteration.
LastFiller = ++I;
// Delay slot filling is disabled at -O0.
if (!DisableDelaySlotFiller && (TM.getOptLevel() != CodeGenOpt::None) &&
findDelayInstr(MBB, I, D)) {
MBB.splice(llvm::next(I), &MBB, D);
++UsefulSlots;
} else
BuildMI(MBB, llvm::next(I), I->getDebugLoc(), TII->get(Mips::NOP));
// Record the filler instruction that filled the delay slot.
// The instruction after it will be visited in the next iteration.
LastFiller = ++I;
// Bundle the delay slot filler to InstrWithSlot so that the machine
// verifier doesn't expect this instruction to be a terminator.
MIBundleBuilder(MBB, InstrWithSlot, llvm::next(LastFiller));
}
// Bundle the delay slot filler to InstrWithSlot so that the machine
// verifier doesn't expect this instruction to be a terminator.
MIBundleBuilder(MBB, InstrWithSlot, llvm::next(LastFiller));
}
return Changed;
}
/// createMipsDelaySlotFillerPass - Returns a pass that fills in delay