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//===-- TargetInstrInfo.cpp - Target Instruction Information --------------===//
//
// 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 implements the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/Constant.h"
#include "llvm/DerivedTypes.h"
using namespace llvm;
TargetInstrInfo::TargetInstrInfo(const TargetInstrDescriptor* Desc,
unsigned numOpcodes)
: desc(Desc), NumOpcodes(numOpcodes) {
}
TargetInstrInfo::~TargetInstrInfo() {
}
/// findTiedToSrcOperand - Returns the operand that is tied to the specified
/// dest operand. Returns -1 if there isn't one.
int
TargetInstrInfo::findTiedToSrcOperand(MachineOpCode Opc, unsigned OpNum) const {
for (unsigned i = 0, e = getNumOperands(Opc); i != e; ++i) {
if (i == OpNum)
continue;
int ti = getOperandConstraint(Opc, i, TOI::TIED_TO);
if (ti == (int)OpNum)
return i;
}
return -1;
}
// commuteInstruction - The default implementation of this method just exchanges
// operand 1 and 2.
MachineInstr *TargetInstrInfo::commuteInstruction(MachineInstr *MI) const {
assert(MI->getOperand(1).isRegister() && MI->getOperand(2).isRegister() &&
"This only knows how to commute register operands so far");
unsigned Reg1 = MI->getOperand(1).getReg();
unsigned Reg2 = MI->getOperand(2).getReg();
bool Reg1IsKill = MI->getOperand(1).isKill();
bool Reg2IsKill = MI->getOperand(2).isKill();
MI->getOperand(2).setReg(Reg1);
MI->getOperand(1).setReg(Reg2);
if (Reg1IsKill)
MI->getOperand(2).setIsKill();
else
MI->getOperand(2).unsetIsKill();
if (Reg2IsKill)
MI->getOperand(1).setIsKill();
else
MI->getOperand(1).unsetIsKill();
return MI;
}
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