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//===- SparcV8InstrInfo.cpp - SparcV8 Instruction Information ---*- C++ -*-===//
//
// 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.
//
//===----------------------------------------------------------------------===//
//
// This file contains the SparcV8 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "SparcV8InstrInfo.h"
#include "SparcV8.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "SparcV8GenInstrInfo.inc"
using namespace llvm;
SparcV8InstrInfo::SparcV8InstrInfo()
: TargetInstrInfo(SparcV8Insts, sizeof(SparcV8Insts)/sizeof(SparcV8Insts[0])){
}
static bool isZeroImmed (const MachineOperand &op) {
return (op.isImmediate() && op.getImmedValue() == 0);
}
/// Return true if the instruction is a register to register move and
/// leave the source and dest operands in the passed parameters.
///
bool SparcV8InstrInfo::isMoveInstr(const MachineInstr &MI,
unsigned &SrcReg, unsigned &DstReg) const {
// We look for 3 kinds of patterns here:
// or with G0 or 0
// add with G0 or 0
// fmovs or FpMOVD (pseudo double move).
if (MI.getOpcode() == V8::ORrr || MI.getOpcode() == V8::ADDrr) {
if (MI.getOperand(1).getReg() == V8::G0) {
DstReg = MI.getOperand(0).getReg();
SrcReg = MI.getOperand(2).getReg();
return true;
} else if (MI.getOperand (2).getReg() == V8::G0) {
DstReg = MI.getOperand(0).getReg();
SrcReg = MI.getOperand(1).getReg();
return true;
}
} else if (MI.getOpcode() == V8::ORri || MI.getOpcode() == V8::ADDri) {
if (isZeroImmed (MI.getOperand (1))) {
DstReg = MI.getOperand(0).getReg();
SrcReg = MI.getOperand(2).getReg();
return true;
} else if (isZeroImmed (MI.getOperand (2))) {
DstReg = MI.getOperand(0).getReg();
SrcReg = MI.getOperand(1).getReg();
return true;
}
} else if (MI.getOpcode() == V8::FMOVS || MI.getOpcode() == V8::FpMOVD) {
SrcReg = MI.getOperand(1).getReg();
DstReg = MI.getOperand(0).getReg();
return true;
}
return false;
}
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