forked from OSchip/llvm-project
77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
//===-- Target.cpp ----------------------------------------------*- 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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// 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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