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//===-- R600ISelLowering.cpp - TODO: Add brief description -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// TODO: Add full description
//
//===----------------------------------------------------------------------===//
#include "R600ISelLowering.h"
#include "R600InstrInfo.h"
#include "R600MachineFunctionInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
using namespace llvm;
R600TargetLowering::R600TargetLowering(TargetMachine &TM) :
AMDGPUTargetLowering(TM),
TII(static_cast<const R600InstrInfo*>(TM.getInstrInfo()))
{
setOperationAction(ISD::MUL, MVT::i64, Expand);
// setSchedulingPreference(Sched::VLIW);
addRegisterClass(MVT::v4f32, &AMDIL::R600_Reg128RegClass);
addRegisterClass(MVT::f32, &AMDIL::R600_Reg32RegClass);
addRegisterClass(MVT::v4i32, &AMDIL::R600_Reg128RegClass);
addRegisterClass(MVT::i32, &AMDIL::R600_Reg32RegClass);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Legal);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Legal);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4i32, Legal);
setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Legal);
}
MachineBasicBlock * R600TargetLowering::EmitInstrWithCustomInserter(
MachineInstr * MI, MachineBasicBlock * BB) const
{
MachineFunction * MF = BB->getParent();
MachineRegisterInfo &MRI = MF->getRegInfo();
switch (MI->getOpcode()) {
default: return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
/* XXX: Use helper function from AMDGPULowerShaderInstructions here */
case AMDIL::TGID_X:
addLiveIn(MI, MF, MRI, TII, AMDIL::T1_X);
break;
case AMDIL::TGID_Y:
addLiveIn(MI, MF, MRI, TII, AMDIL::T1_Y);
break;
case AMDIL::TGID_Z:
addLiveIn(MI, MF, MRI, TII, AMDIL::T1_Z);
break;
case AMDIL::TIDIG_X:
addLiveIn(MI, MF, MRI, TII, AMDIL::T0_X);
break;
case AMDIL::TIDIG_Y:
addLiveIn(MI, MF, MRI, TII, AMDIL::T0_Y);
break;
case AMDIL::TIDIG_Z:
addLiveIn(MI, MF, MRI, TII, AMDIL::T0_Z);
break;
case AMDIL::NGROUPS_X:
lowerImplicitParameter(MI, *BB, MRI, 0);
break;
case AMDIL::NGROUPS_Y:
lowerImplicitParameter(MI, *BB, MRI, 1);
break;
case AMDIL::NGROUPS_Z:
lowerImplicitParameter(MI, *BB, MRI, 2);
break;
case AMDIL::GLOBAL_SIZE_X:
lowerImplicitParameter(MI, *BB, MRI, 3);
break;
case AMDIL::GLOBAL_SIZE_Y:
lowerImplicitParameter(MI, *BB, MRI, 4);
break;
case AMDIL::GLOBAL_SIZE_Z:
lowerImplicitParameter(MI, *BB, MRI, 5);
break;
case AMDIL::LOCAL_SIZE_X:
lowerImplicitParameter(MI, *BB, MRI, 6);
break;
case AMDIL::LOCAL_SIZE_Y:
lowerImplicitParameter(MI, *BB, MRI, 7);
break;
case AMDIL::LOCAL_SIZE_Z:
lowerImplicitParameter(MI, *BB, MRI, 8);
break;
case AMDIL::LOAD_INPUT:
{
int64_t RegIndex = MI->getOperand(1).getImm();
addLiveIn(MI, MF, MRI, TII,
AMDIL::R600_TReg32RegClass.getRegister(RegIndex));
MI->eraseFromParent();
break;
}
case AMDIL::STORE_OUTPUT:
{
MachineBasicBlock::iterator I = *MI;
int64_t OutputIndex = MI->getOperand(1).getImm();
unsigned OutputReg = AMDIL::R600_TReg32RegClass.getRegister(OutputIndex);
BuildMI(*BB, I, BB->findDebugLoc(I), TII->get(AMDIL::COPY), OutputReg)
.addOperand(MI->getOperand(0));
if (!MRI.isLiveOut(OutputReg)) {
MRI.addLiveOut(OutputReg);
}
MI->eraseFromParent();
break;
}
case AMDIL::RESERVE_REG:
{
R600MachineFunctionInfo * MFI = MF->getInfo<R600MachineFunctionInfo>();
int64_t ReservedIndex = MI->getOperand(0).getImm();
unsigned ReservedReg =
AMDIL::R600_TReg32RegClass.getRegister(ReservedIndex);
MFI->ReservedRegs.push_back(ReservedReg);
MI->eraseFromParent();
break;
}
}
return BB;
}
void R600TargetLowering::lowerImplicitParameter(MachineInstr *MI, MachineBasicBlock &BB,
MachineRegisterInfo & MRI, unsigned dword_offset) const
{
MachineBasicBlock::iterator I = *MI;
unsigned offsetReg = MRI.createVirtualRegister(&AMDIL::R600_TReg32_XRegClass);
MRI.setRegClass(MI->getOperand(0).getReg(), &AMDIL::R600_TReg32_XRegClass);
BuildMI(BB, I, BB.findDebugLoc(I), TII->get(AMDIL::MOV), offsetReg)
.addReg(AMDIL::ALU_LITERAL_X)
.addImm(dword_offset * 4);
BuildMI(BB, I, BB.findDebugLoc(I), TII->get(AMDIL::VTX_READ_eg))
.addOperand(MI->getOperand(0))
.addReg(offsetReg)
.addImm(0);
}
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