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4185d03dc5
until the next cycle, and there's no interlock, so they effectively have a delay slot. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14686 91177308-0d34-0410-b5e6-96231b3b80d8
113 lines
2.9 KiB
C++
113 lines
2.9 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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// Simple local delay slot filler for SparcV8 machine code
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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 "Support/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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Filler (TargetMachine &tm) : TM (tm) { }
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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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static bool hasDelaySlot (unsigned Opcode) {
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switch (Opcode) {
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case V8::BA:
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case V8::BCC:
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case V8::BCS:
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case V8::BE:
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case V8::BG:
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case V8::BGE:
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case V8::BGU:
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case V8::BL:
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case V8::BLE:
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case V8::BLEU:
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case V8::BNE:
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case V8::CALL:
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case V8::JMPLrr:
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case V8::RETL:
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case V8::FBA:
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case V8::FBN:
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case V8::FBU:
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case V8::FBG:
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case V8::FBUG:
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case V8::FBL:
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case V8::FBUL:
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case V8::FBLG:
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case V8::FBNE:
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case V8::FBE:
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case V8::FBUE:
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case V8::FBGE:
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case V8::FBUGE:
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case V8::FBLE:
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case V8::FBULE:
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case V8::FBO:
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case V8::FCMPS:
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case V8::FCMPD:
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case V8::FCMPES:
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case V8::FCMPED:
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return true;
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default:
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return false;
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}
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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 (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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