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45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
//===- AlphaInstrInfo.cpp - Alpha Instruction Information -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the Alpha implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "Alpha.h"
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#include "AlphaInstrInfo.h"
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#include "AlphaGenInstrInfo.inc"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include <iostream>
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using namespace llvm;
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AlphaInstrInfo::AlphaInstrInfo()
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: TargetInstrInfo(AlphaInsts, sizeof(AlphaInsts)/sizeof(AlphaInsts[0])) { }
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bool AlphaInstrInfo::isMoveInstr(const MachineInstr& MI,
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unsigned& sourceReg,
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unsigned& destReg) const {
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MachineOpCode oc = MI.getOpcode();
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if (oc == Alpha::BIS || oc == Alpha::CPYSS || oc == Alpha::CPYST) {
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// or r1, r2, r2
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// cpys(s|t) r1 r2 r2
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assert(MI.getNumOperands() == 3 &&
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MI.getOperand(0).isRegister() &&
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MI.getOperand(1).isRegister() &&
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MI.getOperand(2).isRegister() &&
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"invalid Alpha BIS instruction!");
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if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
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sourceReg = MI.getOperand(1).getReg();
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destReg = MI.getOperand(0).getReg();
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return true;
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}
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}
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return false;
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}
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