065e0324e5
Loading constants inline is expensive on CSKY and it's in general better to place the constant nearby in code space and then it can be loaded with a simple 16/32 bit load instruction like lrw. It needs lift or duplicates constant pool entry to make constant nearby so that lrw instruction can reach.
116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
//===--- CSKYTargetMachine.cpp - Define TargetMachine for CSKY ------------===//
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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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//
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// Implements the info about CSKY target spec.
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//
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//===----------------------------------------------------------------------===//
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#include "CSKYTargetMachine.h"
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#include "CSKY.h"
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#include "CSKYSubtarget.h"
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#include "TargetInfo/CSKYTargetInfo.h"
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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#include "llvm/CodeGen/TargetPassConfig.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/MC/TargetRegistry.h"
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using namespace llvm;
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extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeCSKYTarget() {
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RegisterTargetMachine<CSKYTargetMachine> X(getTheCSKYTarget());
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PassRegistry *Registry = PassRegistry::getPassRegistry();
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initializeCSKYConstantIslandsPass(*Registry);
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}
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static std::string computeDataLayout(const Triple &TT) {
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std::string Ret;
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// Only support little endian for now.
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// TODO: Add support for big endian.
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Ret += "e";
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// CSKY is always 32-bit target with the CSKYv2 ABI as prefer now.
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// It's a 4-byte aligned stack with ELF mangling only.
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Ret += "-m:e-S32-p:32:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:32"
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"-v128:32:32-a:0:32-Fi32-n32";
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return Ret;
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}
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CSKYTargetMachine::CSKYTargetMachine(const Target &T, const Triple &TT,
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StringRef CPU, StringRef FS,
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const TargetOptions &Options,
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Optional<Reloc::Model> RM,
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Optional<CodeModel::Model> CM,
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CodeGenOpt::Level OL, bool JIT)
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: LLVMTargetMachine(T, computeDataLayout(TT), TT, CPU, FS, Options,
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RM.getValueOr(Reloc::Static),
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getEffectiveCodeModel(CM, CodeModel::Small), OL),
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TLOF(std::make_unique<TargetLoweringObjectFileELF>()) {
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initAsmInfo();
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}
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const CSKYSubtarget *
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CSKYTargetMachine::getSubtargetImpl(const Function &F) const {
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Attribute CPUAttr = F.getFnAttribute("target-cpu");
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Attribute TuneAttr = F.getFnAttribute("tune-cpu");
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Attribute FSAttr = F.getFnAttribute("target-features");
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std::string CPU =
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CPUAttr.isValid() ? CPUAttr.getValueAsString().str() : TargetCPU;
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std::string TuneCPU =
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TuneAttr.isValid() ? TuneAttr.getValueAsString().str() : CPU;
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std::string FS =
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FSAttr.isValid() ? FSAttr.getValueAsString().str() : TargetFS;
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std::string Key = CPU + TuneCPU + FS;
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auto &I = SubtargetMap[Key];
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if (!I) {
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// This needs to be done before we create a new subtarget since any
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// creation will depend on the TM and the code generation flags on the
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// function that reside in TargetOptions.
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resetTargetOptions(F);
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I = std::make_unique<CSKYSubtarget>(TargetTriple, CPU, TuneCPU, FS, *this);
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if (I->useHardFloat() && !I->hasAnyFloatExt())
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errs() << "Hard-float can't be used with current CPU,"
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" set to Soft-float\n";
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}
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return I.get();
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}
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namespace {
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class CSKYPassConfig : public TargetPassConfig {
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public:
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CSKYPassConfig(CSKYTargetMachine &TM, PassManagerBase &PM)
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: TargetPassConfig(TM, PM) {}
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CSKYTargetMachine &getCSKYTargetMachine() const {
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return getTM<CSKYTargetMachine>();
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}
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bool addInstSelector() override;
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void addPreEmitPass() override;
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};
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} // namespace
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TargetPassConfig *CSKYTargetMachine::createPassConfig(PassManagerBase &PM) {
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return new CSKYPassConfig(*this, PM);
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}
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bool CSKYPassConfig::addInstSelector() {
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addPass(createCSKYISelDag(getCSKYTargetMachine()));
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return false;
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}
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void CSKYPassConfig::addPreEmitPass() {
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addPass(createCSKYConstantIslandPass());
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}
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