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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
//===-- 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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// The PowerPC ExegesisTarget.
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//===----------------------------------------------------------------------===//
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#include "../Target.h"
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#include "../Latency.h"
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#include "PPC.h"
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#include "PPCRegisterInfo.h"
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namespace llvm {
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namespace exegesis {
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#include "PPCGenExegesis.inc"
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namespace {
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class ExegesisPowerPCTarget : public ExegesisTarget {
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public:
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ExegesisPowerPCTarget() : ExegesisTarget(PPCCpuPfmCounters) {}
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private:
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std::vector<llvm::MCInst> setRegTo(const llvm::MCSubtargetInfo &STI,
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unsigned Reg,
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const llvm::APInt &Value) const override;
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bool matchesArch(llvm::Triple::ArchType Arch) const override {
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return Arch == llvm::Triple::ppc64le;
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}
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};
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} // end anonymous namespace
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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 llvm::PPC::LI;
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case 64:
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return llvm::PPC::LI8;
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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 llvm::MCInst loadImmediate(unsigned Reg, unsigned RegBitWidth,
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const llvm::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 llvm::MCInstBuilder(getLoadImmediateOpcode(RegBitWidth))
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.addReg(Reg)
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.addImm(Value.getZExtValue());
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}
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std::vector<llvm::MCInst>
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ExegesisPowerPCTarget::setRegTo(const llvm::MCSubtargetInfo &STI, unsigned Reg,
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const llvm::APInt &Value) const {
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if (llvm::PPC::GPRCRegClass.contains(Reg))
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return {loadImmediate(Reg, 32, Value)};
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if (llvm::PPC::G8RCRegClass.contains(Reg))
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return {loadImmediate(Reg, 64, Value)};
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llvm::errs() << "setRegTo is not implemented, results will be unreliable\n";
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return {};
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}
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static ExegesisTarget *getTheExegesisPowerPCTarget() {
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static ExegesisPowerPCTarget Target;
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return &Target;
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}
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void InitializePowerPCExegesisTarget() {
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ExegesisTarget::registerTarget(getTheExegesisPowerPCTarget());
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}
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} // namespace exegesis
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} // namespace llvm
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