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