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//===- PTXInstrInfo.cpp - PTX Instruction Information ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the PTX implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "PTX.h"
#include "PTXInstrInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
using namespace llvm;
#include "PTXGenInstrInfo.inc"
PTXInstrInfo::PTXInstrInfo(PTXTargetMachine &_TM)
: TargetInstrInfoImpl(PTXInsts, array_lengthof(PTXInsts)),
RI(_TM, *this), TM(_TM) {}
static const struct map_entry {
const TargetRegisterClass *cls;
const int opcode;
} map[] = {
{ &PTX::RRegs32RegClass, PTX::MOVrr },
{ &PTX::PredsRegClass, PTX::MOVpp }
};
void PTXInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I, DebugLoc DL,
unsigned DstReg, unsigned SrcReg,
bool KillSrc) const {
for (int i = 0, e = sizeof(map)/sizeof(map[0]); i != e; ++ i)
if (PTX::RRegs32RegClass.contains(DstReg, SrcReg)) {
BuildMI(MBB, I, DL,
get(PTX::MOVrr), DstReg).addReg(SrcReg, getKillRegState(KillSrc));
return;
}
llvm_unreachable("Impossible reg-to-reg copy");
}
bool PTXInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned DstReg, unsigned SrcReg,
const TargetRegisterClass *DstRC,
const TargetRegisterClass *SrcRC,
DebugLoc DL) const {
if (DstRC != SrcRC)
return false;
for (int i = 0, e = sizeof(map)/sizeof(map[0]); i != e; ++ i)
if (DstRC == map[i].cls) {
MachineInstr *MI = BuildMI(MBB, I, DL, get(map[i].opcode),
DstReg).addReg(SrcReg);
if (MI->findFirstPredOperandIdx() == -1) {
MI->addOperand(MachineOperand::CreateReg(0, false));
MI->addOperand(MachineOperand::CreateImm(/*IsInv=*/0));
}
return true;
}
return false;
}
bool PTXInstrInfo::isMoveInstr(const MachineInstr& MI,
unsigned &SrcReg, unsigned &DstReg,
unsigned &SrcSubIdx, unsigned &DstSubIdx) const {
switch (MI.getOpcode()) {
default:
return false;
case PTX::MOVpp:
case PTX::MOVrr:
assert(MI.getNumOperands() >= 2 &&
MI.getOperand(0).isReg() && MI.getOperand(1).isReg() &&
"Invalid register-register move instruction");
SrcSubIdx = DstSubIdx = 0; // No sub-registers
DstReg = MI.getOperand(0).getReg();
SrcReg = MI.getOperand(1).getReg();
return true;
}
}
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