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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(2)) && MI.getOperand(1).isRegister()) {
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;
}
/// isLoadFromStackSlot - If the specified machine instruction is a direct
/// load from a stack slot, return the virtual or physical register number of
/// the destination along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than loading from the stack slot.
unsigned SparcV8InstrInfo::isLoadFromStackSlot(MachineInstr *MI,
int &FrameIndex) const {
if (MI->getOpcode() == V8::LDri ||
MI->getOpcode() == V8::LDFri ||
MI->getOpcode() == V8::LDDFri) {
if (MI->getOperand(1).isFrameIndex() && MI->getOperand(2).isImmediate() &&
MI->getOperand(2).getImmedValue() == 0) {
FrameIndex = MI->getOperand(1).getFrameIndex();
return MI->getOperand(0).getReg();
}
}
return 0;
}
/// isStoreToStackSlot - If the specified machine instruction is a direct
/// store to a stack slot, return the virtual or physical register number of
/// the source reg along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than storing to the stack slot.
unsigned SparcV8InstrInfo::isStoreToStackSlot(MachineInstr *MI,
int &FrameIndex) const {
if (MI->getOpcode() == V8::STri ||
MI->getOpcode() == V8::STFri ||
MI->getOpcode() == V8::STDFri) {
if (MI->getOperand(0).isFrameIndex() && MI->getOperand(1).isImmediate() &&
MI->getOperand(1).getImmedValue() == 0) {
FrameIndex = MI->getOperand(0).getFrameIndex();
return MI->getOperand(2).getReg();
}
}
return 0;
}
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