55 lines
2.0 KiB
C++
55 lines
2.0 KiB
C++
//===------ llvm/MC/MCInstrDesc.cpp- Instruction Descriptors --------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file defines methods on the MCOperandInfo and MCInstrDesc classes, which
|
|
// are used to describe target instructions and their operands.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/MC/MCInstrDesc.h"
|
|
#include "llvm/MC/MCInst.h"
|
|
#include "llvm/MC/MCRegisterInfo.h"
|
|
#include "llvm/MC/MCSubtargetInfo.h"
|
|
|
|
using namespace llvm;
|
|
|
|
bool MCInstrDesc::mayAffectControlFlow(const MCInst &MI,
|
|
const MCRegisterInfo &RI) const {
|
|
if (isBranch() || isCall() || isReturn() || isIndirectBranch())
|
|
return true;
|
|
unsigned PC = RI.getProgramCounter();
|
|
if (PC == 0)
|
|
return false;
|
|
if (hasDefOfPhysReg(MI, PC, RI))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
bool MCInstrDesc::hasImplicitDefOfPhysReg(unsigned Reg,
|
|
const MCRegisterInfo *MRI) const {
|
|
if (const MCPhysReg *ImpDefs = ImplicitDefs)
|
|
for (; *ImpDefs; ++ImpDefs)
|
|
if (*ImpDefs == Reg || (MRI && MRI->isSubRegister(Reg, *ImpDefs)))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
bool MCInstrDesc::hasDefOfPhysReg(const MCInst &MI, unsigned Reg,
|
|
const MCRegisterInfo &RI) const {
|
|
for (int i = 0, e = NumDefs; i != e; ++i)
|
|
if (MI.getOperand(i).isReg() &&
|
|
RI.isSubRegisterEq(Reg, MI.getOperand(i).getReg()))
|
|
return true;
|
|
if (variadicOpsAreDefs())
|
|
for (int i = NumOperands - 1, e = MI.getNumOperands(); i != e; ++i)
|
|
if (MI.getOperand(i).isReg() &&
|
|
RI.isSubRegisterEq(Reg, MI.getOperand(i).getReg()))
|
|
return true;
|
|
return hasImplicitDefOfPhysReg(Reg, &RI);
|
|
}
|