77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
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//===-- Target.cpp ----------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "../Target.h"
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#include "AArch64.h"
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#include "AArch64RegisterInfo.h"
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namespace llvm {
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namespace exegesis {
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static unsigned getLoadImmediateOpcode(unsigned RegBitWidth) {
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switch (RegBitWidth) {
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case 32:
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return AArch64::MOVi32imm;
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case 64:
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return AArch64::MOVi64imm;
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}
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llvm_unreachable("Invalid Value Width");
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}
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// Generates instruction to load an immediate value into a register.
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static MCInst loadImmediate(unsigned Reg, unsigned RegBitWidth,
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const APInt &Value) {
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if (Value.getBitWidth() > RegBitWidth)
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llvm_unreachable("Value must fit in the Register");
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return MCInstBuilder(getLoadImmediateOpcode(RegBitWidth))
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.addReg(Reg)
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.addImm(Value.getZExtValue());
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}
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#include "AArch64GenExegesis.inc"
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namespace {
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class ExegesisAArch64Target : public ExegesisTarget {
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public:
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ExegesisAArch64Target() : ExegesisTarget(AArch64CpuPfmCounters) {}
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private:
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std::vector<MCInst> setRegTo(const MCSubtargetInfo &STI, unsigned Reg,
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const APInt &Value) const override {
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if (AArch64::GPR32RegClass.contains(Reg))
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return {loadImmediate(Reg, 32, Value)};
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if (AArch64::GPR64RegClass.contains(Reg))
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return {loadImmediate(Reg, 64, Value)};
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errs() << "setRegTo is not implemented, results will be unreliable\n";
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return {};
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}
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bool matchesArch(Triple::ArchType Arch) const override {
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return Arch == Triple::aarch64 || Arch == Triple::aarch64_be;
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}
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void addTargetSpecificPasses(PassManagerBase &PM) const override {
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// Function return is a pseudo-instruction that needs to be expanded
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PM.add(createAArch64ExpandPseudoPass());
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}
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};
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} // namespace
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static ExegesisTarget *getTheExegesisAArch64Target() {
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static ExegesisAArch64Target Target;
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return &Target;
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}
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void InitializeAArch64ExegesisTarget() {
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ExegesisTarget::registerTarget(getTheExegesisAArch64Target());
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}
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} // namespace exegesis
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} // namespace llvm
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