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738005408e
to find instrs that have delay slots. llvm-svn: 16610
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//===-- DelaySlotFiller.cpp - SparcV8 delay slot filler -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is a simple local pass that fills delay slots with NOPs.
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//
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//===----------------------------------------------------------------------===//
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#include "SparcV8.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/ADT/Statistic.h"
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using namespace llvm;
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namespace {
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Statistic<> FilledSlots ("delayslotfiller", "Num. of delay slots filled");
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struct Filler : public MachineFunctionPass {
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/// Target machine description which we query for reg. names, data
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/// layout, etc.
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///
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TargetMachine &TM;
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const TargetInstrInfo *TII;
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Filler (TargetMachine &tm) : TM (tm), TII (tm.getInstrInfo ()) { }
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virtual const char *getPassName () const {
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return "SparcV8 Delay Slot Filler";
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}
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bool runOnMachineBasicBlock (MachineBasicBlock &MBB);
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bool runOnMachineFunction (MachineFunction &F) {
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bool Changed = false;
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for (MachineFunction::iterator FI = F.begin (), FE = F.end ();
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FI != FE; ++FI)
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Changed |= runOnMachineBasicBlock (*FI);
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return Changed;
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}
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};
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} // end of anonymous namespace
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/// createSparcV8DelaySlotFillerPass - Returns a pass that fills in delay
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/// slots in SparcV8 MachineFunctions
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///
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FunctionPass *llvm::createSparcV8DelaySlotFillerPass (TargetMachine &tm) {
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return new Filler (tm);
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}
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/// runOnMachineBasicBlock - Fill in delay slots for the given basic block.
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/// Currently, we fill delay slots with NOPs. We assume there is only one
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/// delay slot per delayed instruction.
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///
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bool Filler::runOnMachineBasicBlock (MachineBasicBlock &MBB) {
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bool Changed = false;
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for (MachineBasicBlock::iterator I = MBB.begin (); I != MBB.end (); ++I)
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if (TII->hasDelaySlot (I->getOpcode ())) {
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MachineBasicBlock::iterator J = I;
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++J;
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BuildMI (MBB, J, V8::NOP, 0);
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++FilledSlots;
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Changed = true;
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}
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return Changed;
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}
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