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1bf9d7e37d
This patch makes sure shift instructions such as this one:
%result = shl i32 %n, %amount
are expanded just before the IR to SelectionDAG conversion to a loop so
that calls to non-existing library functions such as __ashlsi3 are
avoided. The generated code is currently pretty bad but there's a lot of
room for improvement: the shift itself can be done in just four
instructions.
Differential Revision: https://reviews.llvm.org/D96677
136 lines
4.1 KiB
C++
136 lines
4.1 KiB
C++
//===-- AVRTargetMachine.cpp - Define TargetMachine for AVR ---------------===//
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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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// This file defines the AVR specific subclass of TargetMachine.
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//
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//===----------------------------------------------------------------------===//
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#include "AVRTargetMachine.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/TargetPassConfig.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "AVR.h"
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#include "AVRTargetObjectFile.h"
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#include "MCTargetDesc/AVRMCTargetDesc.h"
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#include "TargetInfo/AVRTargetInfo.h"
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namespace llvm {
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static const char *AVRDataLayout = "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8";
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/// Processes a CPU name.
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static StringRef getCPU(StringRef CPU) {
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if (CPU.empty() || CPU == "generic") {
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return "avr2";
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}
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return CPU;
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}
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static Reloc::Model getEffectiveRelocModel(Optional<Reloc::Model> RM) {
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return RM.getValueOr(Reloc::Static);
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}
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AVRTargetMachine::AVRTargetMachine(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, AVRDataLayout, TT, getCPU(CPU), FS, Options,
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getEffectiveRelocModel(RM),
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getEffectiveCodeModel(CM, CodeModel::Small), OL),
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SubTarget(TT, std::string(getCPU(CPU)), std::string(FS), *this) {
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this->TLOF = std::make_unique<AVRTargetObjectFile>();
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initAsmInfo();
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}
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namespace {
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/// AVR Code Generator Pass Configuration Options.
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class AVRPassConfig : public TargetPassConfig {
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public:
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AVRPassConfig(AVRTargetMachine &TM, PassManagerBase &PM)
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: TargetPassConfig(TM, PM) {}
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AVRTargetMachine &getAVRTargetMachine() const {
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return getTM<AVRTargetMachine>();
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}
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void addIRPasses() override;
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bool addInstSelector() override;
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void addPreSched2() override;
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void addPreEmitPass() override;
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void addPreRegAlloc() override;
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};
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} // namespace
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TargetPassConfig *AVRTargetMachine::createPassConfig(PassManagerBase &PM) {
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return new AVRPassConfig(*this, PM);
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}
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void AVRPassConfig::addIRPasses() {
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// Expand instructions like
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// %result = shl i32 %n, %amount
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// to a loop so that library calls are avoided.
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addPass(createAVRShiftExpandPass());
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TargetPassConfig::addIRPasses();
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}
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extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeAVRTarget() {
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// Register the target.
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RegisterTargetMachine<AVRTargetMachine> X(getTheAVRTarget());
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auto &PR = *PassRegistry::getPassRegistry();
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initializeAVRExpandPseudoPass(PR);
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initializeAVRRelaxMemPass(PR);
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initializeAVRShiftExpandPass(PR);
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}
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const AVRSubtarget *AVRTargetMachine::getSubtargetImpl() const {
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return &SubTarget;
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}
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const AVRSubtarget *AVRTargetMachine::getSubtargetImpl(const Function &) const {
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return &SubTarget;
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}
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//===----------------------------------------------------------------------===//
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// Pass Pipeline Configuration
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//===----------------------------------------------------------------------===//
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bool AVRPassConfig::addInstSelector() {
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// Install an instruction selector.
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addPass(createAVRISelDag(getAVRTargetMachine(), getOptLevel()));
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// Create the frame analyzer pass used by the PEI pass.
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addPass(createAVRFrameAnalyzerPass());
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return false;
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}
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void AVRPassConfig::addPreRegAlloc() {
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// Create the dynalloc SP save/restore pass to handle variable sized allocas.
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addPass(createAVRDynAllocaSRPass());
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}
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void AVRPassConfig::addPreSched2() {
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addPass(createAVRRelaxMemPass());
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addPass(createAVRExpandPseudoPass());
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}
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void AVRPassConfig::addPreEmitPass() {
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// Must run branch selection immediately preceding the asm printer.
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addPass(&BranchRelaxationPassID);
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}
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} // end of namespace llvm
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