LLVM  14.0.0git
ARMFeatures.h
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1 //===-- ARMFeatures.h - Checks for ARM instruction features -----*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains the code shared between ARM CodeGen and ARM MC
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_ARM_ARMFEATURES_H
14 #define LLVM_LIB_TARGET_ARM_ARMFEATURES_H
15 
17 
18 namespace llvm {
19 
20 template<typename InstrType> // could be MachineInstr or MCInst
21 bool IsCPSRDead(const InstrType *Instr);
22 
23 template<typename InstrType> // could be MachineInstr or MCInst
24 inline bool isV8EligibleForIT(const InstrType *Instr) {
25  switch (Instr->getOpcode()) {
26  default:
27  return false;
28  case ARM::tADC:
29  case ARM::tADDi3:
30  case ARM::tADDi8:
31  case ARM::tADDrr:
32  case ARM::tAND:
33  case ARM::tASRri:
34  case ARM::tASRrr:
35  case ARM::tBIC:
36  case ARM::tEOR:
37  case ARM::tLSLri:
38  case ARM::tLSLrr:
39  case ARM::tLSRri:
40  case ARM::tLSRrr:
41  case ARM::tMOVi8:
42  case ARM::tMUL:
43  case ARM::tMVN:
44  case ARM::tORR:
45  case ARM::tROR:
46  case ARM::tRSB:
47  case ARM::tSBC:
48  case ARM::tSUBi3:
49  case ARM::tSUBi8:
50  case ARM::tSUBrr:
51  // Outside of an IT block, these set CPSR.
52  return IsCPSRDead(Instr);
53  case ARM::tADDrSPi:
54  case ARM::tCMNz:
55  case ARM::tCMPi8:
56  case ARM::tCMPr:
57  case ARM::tLDRBi:
58  case ARM::tLDRBr:
59  case ARM::tLDRHi:
60  case ARM::tLDRHr:
61  case ARM::tLDRSB:
62  case ARM::tLDRSH:
63  case ARM::tLDRi:
64  case ARM::tLDRr:
65  case ARM::tLDRspi:
66  case ARM::tSTRBi:
67  case ARM::tSTRBr:
68  case ARM::tSTRHi:
69  case ARM::tSTRHr:
70  case ARM::tSTRi:
71  case ARM::tSTRr:
72  case ARM::tSTRspi:
73  case ARM::tTST:
74  return true;
75 // there are some "conditionally deprecated" opcodes
76  case ARM::tADDspr:
77  case ARM::tBLXr:
78  case ARM::tBLXr_noip:
79  return Instr->getOperand(2).getReg() != ARM::PC;
80  // ADD PC, SP and BLX PC were always unpredictable,
81  // now on top of it they're deprecated
82  case ARM::tADDrSP:
83  case ARM::tBX:
84  return Instr->getOperand(0).getReg() != ARM::PC;
85  case ARM::tADDhirr:
86  return Instr->getOperand(0).getReg() != ARM::PC &&
87  Instr->getOperand(2).getReg() != ARM::PC;
88  case ARM::tCMPhir:
89  case ARM::tMOVr:
90  return Instr->getOperand(0).getReg() != ARM::PC &&
91  Instr->getOperand(1).getReg() != ARM::PC;
92  }
93 }
94 
95 }
96 
97 #endif
llvm
This file implements support for optimizing divisions by a constant.
Definition: AllocatorList.h:23
ARMMCTargetDesc.h
llvm::isV8EligibleForIT
bool isV8EligibleForIT(const InstrType *Instr)
Definition: ARMFeatures.h:24
llvm::IRSimilarity::InstrType
InstrType
This represents what is and is not supported when finding similarity in Instructions.
Definition: IRSimilarityIdentifier.h:75
llvm::IsCPSRDead
bool IsCPSRDead(const InstrType *Instr)