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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/Target/RISCV/RISCVPipeline.h"
#include "GISel/RISCVRegisterBankInfo.h"
#include "RISCV.h"
#include "RISCVInstrInfo.h"
#include "rcc/CodeGen/GlobalISel/InstructionSelect.h"
#include "rcc/CodeGen/GlobalISel/Legalizer.h"
#include "rcc/CodeGen/GlobalISel/RegBankSelect.h"
#include "rcc/CodeGen/MachineCombiner.h"
#include "rcc/CodeGen/MachineFunction.h"
#include "rcc/CodeGen/MachineOptimizationPipeline.h"
#include "rcc/CodeGen/PHIElimination.h"
#include "rcc/CodeGen/RegAllocPBQP.h"
#include "rcc/CodeGen/TargetDescription.h"
#include "rcc/CodeGen/TwoAddressInstructionPass.h"
#include <memory>
#include <ranges>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
namespace rcc::riscv {
namespace {
template <typename PassT, typename... ArgumentT>
[[nodiscard]] Expected<void> addPass(MachineFunctionPassManager &Pipeline,
ArgumentT &&...Arguments) {
return Pipeline.addPass(std::make_unique<PassT>(std::forward<ArgumentT>(Arguments)...));
}
[[nodiscard]] Expected<void> addInitialPipeline(MachineFunctionPassManager &Pipeline,
const RISCVSubtarget &Subtarget,
RISCVPipelineOptions Options) {
auto Added = addPass<MachineCombinerPass>(Pipeline, machineCombinerInfo(),
MachineCombinerStage::PreLegalizer);
if (!Added)
return std::unexpected(Added.error());
Added = addPass<Legalizer>(Pipeline, Subtarget.getLegalizerInfo(), Options.Optimization);
if (!Added)
return std::unexpected(Added.error());
Added = addPass<RegBankSelect>(Pipeline, Subtarget.getRegBankInfo());
if (!Added)
return std::unexpected(Added.error());
return addPass<InstructionSelect>(Pipeline, Subtarget.getInstructionSelector());
}
[[nodiscard]] Expected<void> addSSAExitPipeline(MachineFunctionPassManager &Pipeline) {
auto Added = addSelectedSSAOptimizationPipeline(Pipeline, optimizationPipelineInfo());
if (!Added)
return std::unexpected(Added.error());
Added = addPass<PHIEliminationPass>(Pipeline, instrInfo());
if (!Added)
return std::unexpected(Added.error());
return addPass<TwoAddressInstructionPass>(Pipeline, instrInfo());
}
[[nodiscard]] Expected<void> addRegisterAllocationPipeline(MachineFunctionPassManager &Pipeline) {
auto Added = addPreRegisterAllocationOptimizationPipeline(Pipeline, optimizationPipelineInfo());
if (!Added)
return std::unexpected(Added.error());
return addPass<PBQPAllocatorPass>(Pipeline, registerAllocationInfo());
}
[[nodiscard]] Expected<void> addCompleteRegistry(MachineFunctionPassManager &Pipeline,
const RISCVSubtarget &Subtarget,
RISCVPipelineOptions Options) {
auto Added = addInitialPipeline(Pipeline, Subtarget, Options);
if (!Added)
return std::unexpected(Added.error());
Added = addSSAExitPipeline(Pipeline);
if (!Added)
return std::unexpected(Added.error());
Added = addRegisterAllocationPipeline(Pipeline);
if (!Added)
return std::unexpected(Added.error());
return addPostRegisterAllocationPipeline(
Pipeline, optimizationPipelineInfo(),
MachineOptimizationPipelineOptions{.UseTargetCopyInstructions =
Options.UseTargetCopyInstructions});
}
} // namespace
Expected<void> addCanonicalPipeline(MachineFunctionPassManager &Pipeline,
const MachineFunction &Function,
const RISCVSubtarget &Subtarget, RISCVPipelineOptions Options) {
if (!Function.properties().has(MachineFunctionProperty::Legalized)) {
auto Added = addPass<MachineCombinerPass>(Pipeline, machineCombinerInfo(),
MachineCombinerStage::PreLegalizer);
if (!Added)
return std::unexpected(Added.error());
Added = addPass<Legalizer>(Pipeline, Subtarget.getLegalizerInfo(), Options.Optimization);
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(MachineFunctionProperty::RegBankSelected)) {
auto Added = addPass<RegBankSelect>(Pipeline, Subtarget.getRegBankInfo());
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(MachineFunctionProperty::Selected)) {
auto Added = addPass<InstructionSelect>(Pipeline, Subtarget.getInstructionSelector());
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(MachineFunctionProperty::TiedOpsRewritten)) {
auto Added = addSelectedSSAOptimizationPipeline(Pipeline, optimizationPipelineInfo());
if (!Added)
return std::unexpected(Added.error());
if (!Function.properties().has(MachineFunctionProperty::NoPHIs)) {
Added = addPass<PHIEliminationPass>(Pipeline, instrInfo());
if (!Added)
return std::unexpected(Added.error());
}
}
if (!Function.properties().has(MachineFunctionProperty::TiedOpsRewritten)) {
auto Added = addPass<TwoAddressInstructionPass>(Pipeline, instrInfo());
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(MachineFunctionProperty::NoVRegs)) {
auto Added = addRegisterAllocationPipeline(Pipeline);
if (!Added)
return std::unexpected(Added.error());
}
if (!Function.properties().has(MachineFunctionProperty::NoExecutablePseudos)) {
auto Added = addPostRegisterAllocationPipeline(
Pipeline, optimizationPipelineInfo(),
MachineOptimizationPipelineOptions{.UseTargetCopyInstructions =
Options.UseTargetCopyInstructions});
if (!Added)
return std::unexpected(Added.error());
}
return {};
}
Expected<std::unique_ptr<MachineFunctionPass>>
createCanonicalPipelinePass(std::string_view Name, const RISCVSubtarget &Subtarget,
RISCVPipelineOptions Options) {
if (Name.empty())
return makeUnexpected(ErrorCode::InvalidArgument, "pipeline pass name cannot be empty");
MachineFunctionPassManager Registry;
auto Added = addCompleteRegistry(Registry, Subtarget, Options);
if (!Added)
return std::unexpected(Added.error());
MachineFunctionPassManager::PassList Passes = std::move(Registry).takePasses();
auto Position = std::ranges::find_if(Passes, [Name](const auto &Pass) {
return Pass != nullptr && Pass->contract().Name == Name;
});
if (Position == Passes.end()) {
return makeUnexpected(ErrorCode::InvalidArgument,
"unknown RV64GC machine pass '" + std::string(Name) + "'");
}
return std::move(*Position);
}
Expected<std::vector<std::string>> canonicalPipelinePassNames(const MachineFunction &Function,
const RISCVSubtarget &Subtarget) {
MachineFunctionPassManager Pipeline;
auto Added = addCanonicalPipeline(Pipeline, Function, Subtarget);
if (!Added)
return std::unexpected(Added.error());
MachineFunctionPassManager::PassList Passes = std::move(Pipeline).takePasses();
std::vector<std::string> Result;
Result.reserve(Passes.size());
for (const std::unique_ptr<MachineFunctionPass> &Pass : Passes) {
if (Pass == nullptr)
return makeUnexpected(ErrorCode::InternalError, "canonical pipeline contains a null pass");
Result.push_back(Pass->contract().Name);
}
return Result;
}
} // namespace rcc::riscv
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