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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/CodeGen/GlobalISel/Legalizer.h"
#include "GISelMITest.h"
#include "rcc/CodeGen/GlobalISel/GISelChangeObserver.h"
#include "rcc/CodeGen/GlobalISel/LegalizerHelper.h"
#include "rcc/Target/RISCV/RISCVRegisters.h"
#include "rcc/Target/RISCV/RISCVSubtarget.h"
#include "rcc/Target/RISCV/RISCVTarget.h"
#include <cstdint>
#include <memory>
#include <string>
namespace {
using rcc::test::buildAdd;
using rcc::test::createFixture;
using rcc::test::createRegister;
using rcc::test::TestContext;
class BackwardInvalidatingLegalizer final : public rcc::LegalizerInfo {
public:
BackwardInvalidatingLegalizer() {
getActionDefinitionsBuilder(rcc::opcode(rcc::GenericOpcode::G_ADD)).alwaysLegal();
getActionDefinitionsBuilder(rcc::opcode(rcc::GenericOpcode::G_SUB)).custom();
}
[[nodiscard]] rcc::Expected<void>
legalizeCustom(rcc::LegalizerHelper &Helper, rcc::MachineInstr &Instruction,
const rcc::LegalizationDecision &) const override {
rcc::MachineFunction &Function = Helper.MIRBuilder.function();
for (rcc::MachineInstr *Candidate : Function.allInstructions()) {
if (Candidate != &Instruction &&
Candidate->opcode() == rcc::opcode(rcc::GenericOpcode::G_ADD)) {
Helper.Observer.changingInstr(*Candidate);
auto Invalidated = Candidate->setOpcode(rcc::opcode(rcc::GenericOpcode::G_SUB));
if (!Invalidated)
return std::unexpected(Invalidated.error());
Helper.Observer.changedInstr(*Candidate);
break;
}
}
Helper.Observer.changingInstr(Instruction);
auto Changed = Instruction.setOpcode(
rcc::Opcode::fromValue(static_cast<std::uint32_t>(rcc::riscv::InstructionOpcode::ADD)));
if (!Changed)
return std::unexpected(Changed.error());
Helper.Observer.changedInstr(Instruction);
return {};
}
};
void testNullAndMissingContracts(TestContext &Context) {
auto Target = rcc::riscv::createTargetDescription();
auto Fixture = createFixture(Context, "pipeline_contracts", 1);
Context.expect(Target.has_value() && Fixture.Function != nullptr && Fixture.Entry != nullptr,
"pipeline contract fixture must be complete");
if (!Target || !Fixture.Function)
return;
rcc::Legalizer NullPass(nullptr, rcc::OptimizationLevel::O2);
rcc::MachineFunctionAnalysisManager Analyses;
auto NullResult = NullPass.run(*Fixture.Function, *Target, Analyses);
Context.expect(!NullResult && NullResult.error().code() == rcc::ErrorCode::InvalidArgument,
"a null legalizer interface must be rejected");
Context.expect(Fixture.Function->properties().empty(),
"a rejected pass must not publish function properties");
const rcc::riscv::RISCVSubtarget Subtarget(rcc::riscv::RISCVSubtargetFeatures::rv64gc());
rcc::Legalizer ValidPass(Subtarget.getLegalizerInfo(), rcc::OptimizationLevel::O2);
auto MissingResult = ValidPass.run(*Fixture.Function, *Target, Analyses);
Context.expect(!MissingResult &&
MissingResult.error().code() == rcc::ErrorCode::VerificationError,
"a pass with missing prerequisites must be rejected");
}
void testUnsupportedRollback(TestContext &Context) {
auto Target = rcc::riscv::createTargetDescription();
if (!Target)
return;
auto Unsupported = createFixture(Context, "pipeline_unsupported", 3);
Context.expect(Unsupported.Function != nullptr && Unsupported.Entry != nullptr,
"unsupported pipeline fixture must be complete");
if (!Unsupported.Function || Unsupported.Entry == nullptr)
return;
const rcc::Register UnsupportedReg = createRegister(Context, *Unsupported.Function, 64);
rcc::MachineIRBuilder UnsupportedBuilder(*Unsupported.Function, *Target);
Context.expect(UnsupportedBuilder.setInsertPoint(*Unsupported.Entry).has_value(),
"unsupported pipeline insertion point must be valid");
if (UnsupportedReg.isNoRegister())
return;
auto Pending = UnsupportedBuilder.buildInstr(rcc::opcode(rcc::GenericOpcode::G_GET_FPENV));
Context.expect(Pending.has_value(), "unsupported generic instruction must be constructible");
if (!Pending)
return;
auto Built = Pending->addDef(UnsupportedReg);
Context.expect(Built.has_value(), "unsupported generic definition must be accepted");
if (!Built)
return;
Context.expect(Pending->build().has_value(),
"unsupported floating-point environment operation must be constructible");
Unsupported.Function->properties() = {rcc::MachineFunctionProperty::IsSSA,
rcc::MachineFunctionProperty::TracksLiveness};
const rcc::riscv::RISCVSubtarget Subtarget(rcc::riscv::RISCVSubtargetFeatures::rv64gc());
rcc::MachineFunctionPassManager OnlyLegalizer;
Context.expect(OnlyLegalizer
.addPass(std::make_unique<rcc::Legalizer>(Subtarget.getLegalizerInfo(),
rcc::OptimizationLevel::O2))
.has_value(),
"standalone legalizer must be accepted");
rcc::MachineFunctionAnalysisManager UnsupportedAnalyses;
auto Failure = OnlyLegalizer.run(*Unsupported.Function, *Target, UnsupportedAnalyses);
Context.expect(!Failure && Failure.error().code() == rcc::ErrorCode::Unsupported,
"unsupported generic instructions must produce a target diagnostic");
Context.expect(!Failure && Failure.error().message().find("G_GET_FPENV") != std::string::npos,
"unsupported legalization diagnostics must name the rejected opcode");
Context.expect(
Unsupported.Function->properties().has(rcc::MachineFunctionProperty::IsSSA) &&
!Unsupported.Function->properties().has(rcc::MachineFunctionProperty::Legalized),
"failed legalizer execution must not publish Legalized");
}
void testLegalizerRevisitsInvalidatedInstructions(TestContext &Context) {
auto Target = rcc::riscv::createTargetDescription();
auto Fixture = createFixture(Context, "pipeline_legalizer_revisit", 7);
if (!Target || !Fixture.Function || Fixture.Entry == nullptr)
return;
const rcc::Register Left = createRegister(Context, *Fixture.Function, 64);
const rcc::Register Right = createRegister(Context, *Fixture.Function, 64);
const rcc::Register FirstResult = createRegister(Context, *Fixture.Function, 64);
const rcc::Register SecondResult = createRegister(Context, *Fixture.Function, 64);
rcc::MachineIRBuilder Builder(*Fixture.Function, *Target);
if (Left.isNoRegister() || Right.isNoRegister() || FirstResult.isNoRegister() ||
SecondResult.isNoRegister() || !Builder.setInsertPoint(*Fixture.Entry) ||
!buildAdd(Context, Builder, FirstResult, Left, Right) ||
!buildAdd(Context, Builder, SecondResult, Left, Right))
return;
rcc::MachineInstr *First = Fixture.Entry->firstInstruction();
rcc::MachineInstr *Second = First == nullptr ? nullptr : First->next();
if (Second == nullptr || !Second->setOpcode(rcc::opcode(rcc::GenericOpcode::G_SUB)))
return;
auto X10 = rcc::riscv::physicalRegister(rcc::riscv::PhysicalRegisterID::X10);
auto X11 = rcc::riscv::physicalRegister(rcc::riscv::PhysicalRegisterID::X11);
auto FirstCopy = Builder.buildInstr(rcc::opcode(rcc::GenericOpcode::COPY));
auto SecondCopy = Builder.buildInstr(rcc::opcode(rcc::GenericOpcode::COPY));
if (!X10 || !X11 || !FirstCopy || !FirstCopy->addDef(rcc::Register::fromPhysical(*X10)) ||
!FirstCopy->addUse(FirstResult) || !FirstCopy->build() || !SecondCopy ||
!SecondCopy->addDef(rcc::Register::fromPhysical(*X11)) || !SecondCopy->addUse(SecondResult) ||
!SecondCopy->build())
return;
Fixture.Function->properties() = {rcc::MachineFunctionProperty::IsSSA,
rcc::MachineFunctionProperty::TracksLiveness};
BackwardInvalidatingLegalizer Legalizer;
rcc::Legalizer Pass(Legalizer, rcc::OptimizationLevel::O2);
rcc::MachineFunctionAnalysisManager Analyses;
auto Run = Pass.run(*Fixture.Function, *Target, Analyses);
const rcc::Opcode LegalOpcode =
rcc::Opcode::fromValue(static_cast<std::uint32_t>(rcc::riscv::InstructionOpcode::ADD));
Context.expect(Run && First->opcode() == LegalOpcode && Second->opcode() == LegalOpcode,
"legalizer must revisit an earlier instruction invalidated by a later lowering");
}
} // namespace
int main() {
TestContext Context;
testNullAndMissingContracts(Context);
testUnsupportedRollback(Context);
testLegalizerRevisitsInvalidatedInstructions(Context);
return Context.result();
}
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