1//===------------------- X86CustomBehaviour.cpp -----------------*-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/// \file
9///
10/// This file implements methods from the X86CustomBehaviour class.
11///
12//===----------------------------------------------------------------------===//
13
14#include "X86CustomBehaviour.h"
15#include "TargetInfo/X86TargetInfo.h"
16#include "MCTargetDesc/X86BaseInfo.h"
17#include "llvm/MC/TargetRegistry.h"
18#include "llvm/Support/WithColor.h"
19
20namespace llvm {
21namespace mca {
22
23void X86InstrPostProcess::setMemBarriers(std::unique_ptr<Instruction> &Inst,
24 const MCInst &MCI) {
25 switch (MCI.getOpcode()) {
26 case X86::MFENCE:
27 Inst->setLoadBarrier(true);
28 Inst->setStoreBarrier(true);
29 break;
30 case X86::LFENCE:
31 Inst->setLoadBarrier(true);
32 break;
33 case X86::SFENCE:
34 Inst->setStoreBarrier(true);
35 break;
36 }
37}
38
39void X86InstrPostProcess::postProcessInstruction(
40 std::unique_ptr<Instruction> &Inst, const MCInst &MCI) {
41 // Currently, we only modify certain instructions' IsALoadBarrier and
42 // IsAStoreBarrier flags.
43 setMemBarriers(Inst, MCI);
44}
45
46} // namespace mca
47} // namespace llvm
48
49using namespace llvm;
50using namespace mca;
51
52static InstrPostProcess *createX86InstrPostProcess(const MCSubtargetInfo &STI,
53 const MCInstrInfo &MCII) {
54 return new X86InstrPostProcess(STI, MCII);
55}
56
57/// Extern function to initialize the targets for the X86 backend
58
59extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeX86TargetMCA() {
60 TargetRegistry::RegisterInstrPostProcess(T&: getTheX86_32Target(),
61 Fn: createX86InstrPostProcess);
62 TargetRegistry::RegisterInstrPostProcess(T&: getTheX86_64Target(),
63 Fn: createX86InstrPostProcess);
64}
65