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//===-- ARMFeatures.h - Checks for ARM instruction features -----*- C++ -*-===//
//
// 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 contains the code shared between ARM CodeGen and ARM MC
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_ARM_ARMFEATURES_H
#define LLVM_LIB_TARGET_ARM_ARMFEATURES_H
#include "MCTargetDesc/ARMMCTargetDesc.h"
namespace llvm {
template<typename InstrType> // could be MachineInstr or MCInst
bool IsCPSRDead(const InstrType *Instr);
template<typename InstrType> // could be MachineInstr or MCInst
inline bool isV8EligibleForIT(const InstrType *Instr) {
switch (Instr->getOpcode()) {
default:
return false;
case ARM::tADC:
case ARM::tADDi3:
case ARM::tADDi8:
case ARM::tADDrr:
case ARM::tAND:
case ARM::tASRri:
case ARM::tASRrr:
case ARM::tBIC:
case ARM::tEOR:
case ARM::tLSLri:
case ARM::tLSLrr:
case ARM::tLSRri:
case ARM::tLSRrr:
case ARM::tMOVi8:
case ARM::tMUL:
case ARM::tMVN:
case ARM::tORR:
case ARM::tROR:
case ARM::tRSB:
case ARM::tSBC:
case ARM::tSUBi3:
case ARM::tSUBi8:
case ARM::tSUBrr:
// Outside of an IT block, these set CPSR.
return IsCPSRDead(Instr);
case ARM::tADDrSPi:
case ARM::tCMNz:
case ARM::tCMPi8:
case ARM::tCMPr:
case ARM::tLDRBi:
case ARM::tLDRBr:
case ARM::tLDRHi:
case ARM::tLDRHr:
case ARM::tLDRSB:
case ARM::tLDRSH:
case ARM::tLDRi:
case ARM::tLDRr:
case ARM::tLDRspi:
case ARM::tSTRBi:
case ARM::tSTRBr:
case ARM::tSTRHi:
case ARM::tSTRHr:
case ARM::tSTRi:
case ARM::tSTRr:
case ARM::tSTRspi:
case ARM::tTST:
return true;
// there are some "conditionally deprecated" opcodes
case ARM::tADDspr:
case ARM::tBLXr:
case ARM::tBLXr_noip:
return Instr->getOperand(2).getReg() != ARM::PC;
// ADD PC, SP and BLX PC were always unpredictable,
// now on top of it they're deprecated
case ARM::tADDrSP:
case ARM::tBX:
return Instr->getOperand(0).getReg() != ARM::PC;
case ARM::tADDhirr:
return Instr->getOperand(0).getReg() != ARM::PC &&
Instr->getOperand(2).getReg() != ARM::PC;
case ARM::tCMPhir:
case ARM::tMOVr:
return Instr->getOperand(0).getReg() != ARM::PC &&
Instr->getOperand(1).getReg() != ARM::PC;
}
}
}
#endif
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