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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/Target/RISCV/RISCVSubtarget.h"
#include "GISel/RISCVCallLowering.h"
#include "GISel/RISCVLegalizerInfo.h"
#include "GISel/RISCVRegisterBankInfo.h"
#include "RISCV.h"
#include "rcc/CodeGen/GlobalISel/InstructionSelector.h"
#include <array>
#include <cstddef>
#include <string_view>
namespace rcc::riscv {
namespace {
struct ExtensionName final {
std::string_view Name;
RISCVExtension Extension;
};
struct OptionName final {
std::string_view Name;
RISCVSubtargetOption Option;
};
constexpr std::array ExtensionNames{
ExtensionName{"i", RISCVExtension::I},
ExtensionName{"m", RISCVExtension::M},
ExtensionName{"a", RISCVExtension::A},
ExtensionName{"f", RISCVExtension::F},
ExtensionName{"d", RISCVExtension::D},
ExtensionName{"c", RISCVExtension::C},
ExtensionName{"zbb", RISCVExtension::Zbb},
ExtensionName{"zicsr", RISCVExtension::Zicsr},
ExtensionName{"zifencei", RISCVExtension::Zifencei},
ExtensionName{"zacas", RISCVExtension::Zacas},
ExtensionName{"zabha", RISCVExtension::Zabha},
};
constexpr std::array OptionNames{
OptionName{"disable-postmisched-load-clustering",
RISCVSubtargetOption::DisablePostMISchedLoadClustering},
OptionName{"disable-postmisched-store-clustering",
RISCVSubtargetOption::DisablePostMISchedStoreClustering},
OptionName{"fusion-add-load", RISCVSubtargetOption::FusionAddLoad},
OptionName{"fusion-add-mem", RISCVSubtargetOption::FusionAddMemory},
OptionName{"fusion-addi-load", RISCVSubtargetOption::FusionAddImmediateLoad},
OptionName{"fusion-auipc-addi", RISCVSubtargetOption::FusionAUIPCAddImmediate},
OptionName{"fusion-auipc-load", RISCVSubtargetOption::FusionAUIPCLoad},
OptionName{"fusion-ld-add", RISCVSubtargetOption::FusionLoadDoubleAdd},
OptionName{"fusion-logic-imm-reg", RISCVSubtargetOption::FusionLogicImmediateRegister},
OptionName{"fusion-logic-reg-imm", RISCVSubtargetOption::FusionLogicRegisterImmediate},
OptionName{"fusion-logic-reg-reg", RISCVSubtargetOption::FusionLogicRegisterRegister},
OptionName{"fusion-lui-addi", RISCVSubtargetOption::FusionLUIAddImmediate},
OptionName{"fusion-lui-load", RISCVSubtargetOption::FusionLUILoad},
OptionName{"fusion-mul-add", RISCVSubtargetOption::FusionMultiplyAdd},
OptionName{"fusion-shift-bit-extract", RISCVSubtargetOption::FusionShiftBitExtract},
OptionName{"fusion-shifted-zextw", RISCVSubtargetOption::FusionShiftedZeroExtendWord},
OptionName{"fusion-zexth", RISCVSubtargetOption::FusionZeroExtendHalf},
OptionName{"fusion-zextw", RISCVSubtargetOption::FusionZeroExtendWord},
OptionName{"prefer-w-inst", RISCVSubtargetOption::PreferWordInstructions},
OptionName{"reserve-x6", RISCVSubtargetOption::ReserveX6},
OptionName{"reserve-x7", RISCVSubtargetOption::ReserveX7},
OptionName{"save-restore", RISCVSubtargetOption::SaveRestore},
OptionName{"tagged-globals", RISCVSubtargetOption::TaggedGlobals},
OptionName{"unaligned-scalar-mem", RISCVSubtargetOption::UnalignedScalarMemory},
OptionName{"use-postra-scheduler", RISCVSubtargetOption::UsePostRAScheduler},
};
[[nodiscard]] constexpr std::uint16_t extensionBit(RISCVExtension Extension) noexcept {
return static_cast<std::uint16_t>(std::uint16_t{1} << static_cast<std::uint8_t>(Extension));
}
[[nodiscard]] constexpr std::uint32_t optionBit(RISCVSubtargetOption Option) noexcept {
static_assert(static_cast<std::uint8_t>(RISCVSubtargetOption::Count) <= 32);
return std::uint32_t{1} << static_cast<std::uint8_t>(Option);
}
[[nodiscard]] const ExtensionName *findExtension(std::string_view Name) noexcept {
for (const ExtensionName &Entry : ExtensionNames) {
if (Entry.Name == Name)
return &Entry;
}
return nullptr;
}
[[nodiscard]] const OptionName *findOption(std::string_view Name) noexcept {
for (const OptionName &Entry : OptionNames) {
if (Entry.Name == Name)
return &Entry;
}
return nullptr;
}
} // namespace
Expected<RISCVSubtargetFeatures>
RISCVSubtargetFeatures::fromFeatureList(std::span<const std::string> Features) {
std::uint16_t Enabled = extensionBit(RISCVExtension::I);
std::uint16_t ExplicitlyDisabled = 0;
std::uint32_t Options = 0;
for (const std::string &Feature : Features) {
if (Feature.size() < 2 || (Feature.front() != '+' && Feature.front() != '-')) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"RISC-V target feature must use canonical +/- spelling");
}
const std::string_view Name = std::string_view(Feature).substr(1);
const ExtensionName *Extension = findExtension(Name);
const OptionName *Option = findOption(Name);
if (Extension == nullptr && Option == nullptr) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"RISC-V backend does not support target feature '" + Feature + "'");
}
if (Extension != nullptr) {
if (Feature.front() == '+') {
Enabled |= extensionBit(Extension->Extension);
ExplicitlyDisabled &= static_cast<std::uint16_t>(~extensionBit(Extension->Extension));
} else {
Enabled &= static_cast<std::uint16_t>(~extensionBit(Extension->Extension));
ExplicitlyDisabled |= extensionBit(Extension->Extension);
}
} else if (Feature.front() == '+') {
Options |= optionBit(Option->Option);
} else {
Options &= ~optionBit(Option->Option);
}
}
RISCVSubtargetFeatures Result(Enabled, Options);
if (!Result.has(RISCVExtension::I)) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"RV64 target feature configuration cannot disable the base I extension");
}
if (Result.has(RISCVExtension::D) &&
(ExplicitlyDisabled & extensionBit(RISCVExtension::F)) != 0) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"RISC-V D extension requires the F extension");
}
if (Result.has(RISCVExtension::D))
Enabled |= extensionBit(RISCVExtension::F);
if ((Result.has(RISCVExtension::Zacas) || Result.has(RISCVExtension::Zabha)) &&
(ExplicitlyDisabled & extensionBit(RISCVExtension::A)) != 0) {
return makeUnexpected(ErrorCode::InvalidInvocation,
"RISC-V Zacas and Zabha extensions require the A extension");
}
if (Result.has(RISCVExtension::Zacas) || Result.has(RISCVExtension::Zabha))
Enabled |= extensionBit(RISCVExtension::A);
return RISCVSubtargetFeatures(Enabled, Options);
}
RISCVSubtargetFeatures RISCVSubtargetFeatures::rv64gc() noexcept {
return RISCVSubtargetFeatures(extensionBit(RISCVExtension::I) | extensionBit(RISCVExtension::M) |
extensionBit(RISCVExtension::A) | extensionBit(RISCVExtension::F) |
extensionBit(RISCVExtension::D) | extensionBit(RISCVExtension::C) |
extensionBit(RISCVExtension::Zicsr) |
extensionBit(RISCVExtension::Zifencei));
}
bool RISCVSubtargetFeatures::has(RISCVExtension Extension) const noexcept {
if (Extension >= RISCVExtension::Count)
return false;
return (Enabled & extensionBit(Extension)) != 0;
}
bool RISCVSubtargetFeatures::has(RISCVSubtargetOption Option) const noexcept {
if (Option >= RISCVSubtargetOption::Count)
return false;
return (Options & optionBit(Option)) != 0;
}
RISCVSubtarget::RISCVSubtarget(RISCVSubtargetFeatures Features) : Features(Features) {}
RISCVSubtarget::~RISCVSubtarget() = default;
const TargetCallLowering *RISCVSubtarget::getCallLowering() const {
if (!CallLoweringInfo)
CallLoweringInfo = std::make_unique<RISCVCallLowering>();
return CallLoweringInfo.get();
}
InstructionSelector *RISCVSubtarget::getInstructionSelector() const {
if (!InstSelector)
InstSelector.reset(createRISCVInstructionSelector(*this, *getRegBankInfo()));
return InstSelector.get();
}
const LegalizerInfo *RISCVSubtarget::getLegalizerInfo() const {
if (!Legalizer)
Legalizer = std::make_unique<RISCVLegalizerInfo>(*this);
return Legalizer.get();
}
const RISCVRegisterBankInfo *RISCVSubtarget::getRegBankInfo() const {
if (!RegBankInfo)
RegBankInfo = std::make_unique<RISCVRegisterBankInfo>();
return RegBankInfo.get();
}
} // namespace rcc::riscv
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