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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rcc/CodeGen/MachinePeepholeOptimizer.h"
#include "rcc/CodeGen/MachineBasicBlock.h"
#include "rcc/CodeGen/MachineFunction.h"
#include "rcc/CodeGen/MachineFunctionCloner.h"
#include "rcc/CodeGen/MachineInstr.h"
#include "rcc/CodeGen/TargetDescription.h"
#include "rcc/CodeGen/TargetInstrInfo.h"
#include <optional>
namespace rcc {
namespace {
[[nodiscard]] const MachinePassContract &peepholeOptimizerContract() {
static const MachinePassContract Contract = [] {
MachinePassContract Value{
.Name = "peephole-opt",
.Requires = {MachineFunctionProperty::IsSSA},
.Sets = {},
.Clears = {},
.RequiredAnalyses = {},
.VerificationStage = PipelineStage::Selected,
};
Value.ThreadSafety = PassThreadSafety::ThreadSafe;
Value.DeclaredChanges = {MachinePassChange::Instructions, MachinePassChange::Operands,
MachinePassChange::Registers};
return Value;
}();
return Contract;
}
} // namespace
const MachinePassContract &MachinePeepholeOptimizerPass::contract() const noexcept {
return peepholeOptimizerContract();
}
Expected<MachinePassResult> MachinePeepholeOptimizerPass::run(MachineFunction &Function,
const TargetDescription &Target,
MachineFunctionAnalysisManager &) {
auto Trial = cloneMachineFunction(
Function, Target,
MachineFunctionCloneOptions{.NewStableID = Function.stableID(), .NewName = std::nullopt});
if (!Trial) {
return std::unexpected(
withErrorContext(Trial.error(), "machine peephole transaction setup failed: "));
}
auto TrialResult = runImplementation(*Trial->ClonedFunction, Target);
if (!TrialResult)
return std::unexpected(TrialResult.error());
auto Result = runImplementation(Function, Target);
if (!Result) {
return std::unexpected(withErrorContext(
Result.error(), "machine peephole diverged after a successful transaction preflight: "));
}
return Result;
}
Expected<MachinePassResult>
MachinePeepholeOptimizerPass::runImplementation(MachineFunction &Function,
const TargetDescription &Target) const {
MachinePassResult Result;
for (MachineBasicBlock *Block = Function.firstBlock(); Block != nullptr; Block = Block->next()) {
for (MachineInstr *Instruction = Block->firstInstruction(); Instruction != nullptr;) {
MachineInstr *Next = Instruction->next();
if (!Instruction->isDebugInstr()) {
auto Changed = Info->optimizeCondBranch(*Instruction, Function, Target);
if (!Changed)
return std::unexpected(Changed.error());
Result.Changed |= *Changed;
}
Instruction = Next;
}
}
if (Result.Changed) {
Result.Changes = {MachinePassChange::Instructions, MachinePassChange::Operands,
MachinePassChange::Registers};
Result.Preserved = PreservedAnalyses::none();
} else {
Result.Preserved = PreservedAnalyses::all();
}
return Result;
}
} // namespace rcc
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