mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
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 -------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Simple local delay slot filler for SparcV8 machine code
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "SparcV8.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
|
#include "Support/Statistic.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
Statistic<> FilledSlots ("delayslotfiller", "Num. of delay slots filled");
|
|
|
|
struct Filler : public MachineFunctionPass {
|
|
/// Target machine description which we query for reg. names, data
|
|
/// layout, etc.
|
|
///
|
|
TargetMachine &TM;
|
|
|
|
Filler (TargetMachine &tm) : TM (tm) { }
|
|
|
|
virtual const char *getPassName () const {
|
|
return "SparcV8 Delay Slot Filler";
|
|
}
|
|
|
|
bool runOnMachineBasicBlock (MachineBasicBlock &MBB);
|
|
bool runOnMachineFunction (MachineFunction &F) {
|
|
bool Changed = false;
|
|
for (MachineFunction::iterator FI = F.begin (), FE = F.end ();
|
|
FI != FE; ++FI)
|
|
Changed |= runOnMachineBasicBlock (*FI);
|
|
return Changed;
|
|
}
|
|
|
|
};
|
|
} // end of anonymous namespace
|
|
|
|
/// createSparcV8DelaySlotFillerPass - Returns a pass that fills in delay
|
|
/// slots in SparcV8 MachineFunctions
|
|
///
|
|
FunctionPass *llvm::createSparcV8DelaySlotFillerPass (TargetMachine &tm) {
|
|
return new Filler (tm);
|
|
}
|
|
|
|
static bool hasDelaySlot (unsigned Opcode) {
|
|
switch (Opcode) {
|
|
case V8::BA:
|
|
case V8::BCC:
|
|
case V8::BCS:
|
|
case V8::BE:
|
|
case V8::BG:
|
|
case V8::BGE:
|
|
case V8::BGU:
|
|
case V8::BL:
|
|
case V8::BLE:
|
|
case V8::BLEU:
|
|
case V8::BNE:
|
|
case V8::CALL:
|
|
case V8::JMPLrr:
|
|
case V8::RETL:
|
|
case V8::FBA:
|
|
case V8::FBN:
|
|
case V8::FBU:
|
|
case V8::FBG:
|
|
case V8::FBUG:
|
|
case V8::FBL:
|
|
case V8::FBUL:
|
|
case V8::FBLG:
|
|
case V8::FBNE:
|
|
case V8::FBE:
|
|
case V8::FBUE:
|
|
case V8::FBGE:
|
|
case V8::FBUGE:
|
|
case V8::FBLE:
|
|
case V8::FBULE:
|
|
case V8::FBO:
|
|
case V8::FCMPS:
|
|
case V8::FCMPD:
|
|
case V8::FCMPES:
|
|
case V8::FCMPED:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/// runOnMachineBasicBlock - Fill in delay slots for the given basic block.
|
|
/// Currently, we fill delay slots with NOPs. We assume there is only one
|
|
/// delay slot per delayed instruction.
|
|
///
|
|
bool Filler::runOnMachineBasicBlock (MachineBasicBlock &MBB) {
|
|
bool Changed = false;
|
|
for (MachineBasicBlock::iterator I = MBB.begin (); I != MBB.end (); ++I)
|
|
if (hasDelaySlot (I->getOpcode ())) {
|
|
MachineBasicBlock::iterator J = I;
|
|
++J;
|
|
BuildMI (MBB, J, V8::NOP, 0);
|
|
++FilledSlots;
|
|
Changed = true;
|
|
}
|
|
return Changed;
|
|
}
|