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// SPDX-License-Identifier: GPL-3.0-or-later
#include "CodeGenTarget.h"
#include <algorithm>
#include <cstdint>
#include <optional>
#include <ranges>
#include <string>
#include <string_view>
#include <unordered_set>
#include <vector>
namespace rcc::targetgen {
namespace {
[[nodiscard]] const NormalizedInstruction *findInstruction(const NormalizedTargetModel &Model,
std::string_view Symbol) noexcept {
const auto Position =
std::ranges::find(Model.Instructions, Symbol, &NormalizedInstruction::Symbol);
return Position == Model.Instructions.end() ? nullptr : &*Position;
}
[[nodiscard]] bool isOperandKind(const NormalizedInstruction &Instruction,
std::uint32_t OperandIndex, std::string_view Kind) noexcept {
return OperandIndex < Instruction.Operands.size() &&
std::ranges::contains(Instruction.Operands[OperandIndex].Kinds, Kind);
}
[[nodiscard]] std::optional<NormalizedMacroFusionInstruction>
normalizeInstructionSide(std::string_view Side) noexcept {
if (Side == "first")
return NormalizedMacroFusionInstruction::First;
if (Side == "second")
return NormalizedMacroFusionInstruction::Second;
return std::nullopt;
}
} // namespace
bool CodeGenTarget::normalizeMacroFusionRules(NormalizedTargetModel &Result) {
std::unordered_set<std::string> Symbols;
std::unordered_set<std::string> Features;
for (const SourceMacroFusionRule &Rule : Input.MacroFusionRules) {
if (!isIdentifier(Rule.Symbol) || Rule.Feature.empty() || Rule.FirstOpcodeSymbols.empty() ||
Rule.SecondOpcodeSymbols.empty() || !Symbols.insert(Rule.Symbol).second ||
!Features.insert(Rule.Feature).second) {
fail(Rule.Range,
"macro fusion rules require unique identifiers and features plus nonempty opcode sets");
return false;
}
NormalizedMacroFusionRule Normalized{
.Symbol = Rule.Symbol,
.Feature = Rule.Feature,
.FirstOpcodes = {},
.SecondOpcodes = {},
.OpcodePairs = {},
.ImmediatePredicates = {},
.RegisterInequalities = {},
.ImmediateRelations = {},
.FirstDefinitionOperand = Rule.FirstDefinitionOperand,
.SecondUseOperand = Rule.SecondUseOperand,
.SecondDefinitionOperand = Rule.SecondDefinitionOperand,
.CommutableSecondUseOperand = Rule.CommutableSecondUseOperand,
.RequireSingleNonDebugUse = Rule.RequireSingleNonDebugUse,
.RequireSecondDestinationTie = Rule.RequireSecondDestinationTie,
};
std::unordered_set<std::uint32_t> FirstOpcodes;
std::unordered_set<std::uint32_t> SecondOpcodes;
std::vector<const NormalizedInstruction *> FirstInstructions;
std::vector<const NormalizedInstruction *> SecondInstructions;
const auto NormalizeOpcodes =
[this, &Result](const std::vector<std::string> &OpcodeSymbols,
std::unordered_set<std::uint32_t> &Opcodes,
std::vector<std::uint32_t> &Output,
std::vector<const NormalizedInstruction *> &Instructions, TextRange Range) {
for (const std::string &Symbol : OpcodeSymbols) {
const NormalizedInstruction *Instruction = findInstruction(Result, Symbol);
if (Instruction == nullptr || !Opcodes.insert(Instruction->ID).second) {
fail(Range, "macro fusion opcodes must name distinct declared target instructions");
return false;
}
Output.push_back(Instruction->ID);
Instructions.push_back(Instruction);
}
return true;
};
if (!NormalizeOpcodes(Rule.FirstOpcodeSymbols, FirstOpcodes, Normalized.FirstOpcodes,
FirstInstructions, Rule.Range) ||
!NormalizeOpcodes(Rule.SecondOpcodeSymbols, SecondOpcodes, Normalized.SecondOpcodes,
SecondInstructions, Rule.Range)) {
return false;
}
const auto AllHaveOperandKind = [](const auto &Instructions, std::uint32_t Operand,
std::string_view Kind) {
return std::ranges::all_of(Instructions, [Operand, Kind](const auto *Instruction) {
return isOperandKind(*Instruction, Operand, Kind);
});
};
if (!AllHaveOperandKind(FirstInstructions, Rule.FirstDefinitionOperand, "Register") ||
!AllHaveOperandKind(SecondInstructions, Rule.SecondUseOperand, "Register") ||
(Rule.RequireSecondDestinationTie &&
!AllHaveOperandKind(SecondInstructions, Rule.SecondDefinitionOperand, "Register")) ||
(Rule.CommutableSecondUseOperand &&
!AllHaveOperandKind(SecondInstructions, *Rule.CommutableSecondUseOperand, "Register"))) {
fail(Rule.Range, "macro fusion linkage must reference register operands of every opcode");
return false;
}
std::unordered_set<std::uint64_t> OpcodePairs;
for (const SourceMacroFusionOpcodePair &Pair : Rule.OpcodePairs) {
const NormalizedInstruction *First = findInstruction(Result, Pair.FirstOpcodeSymbol);
const NormalizedInstruction *Second = findInstruction(Result, Pair.SecondOpcodeSymbol);
if (First == nullptr || Second == nullptr || !FirstOpcodes.contains(First->ID) ||
!SecondOpcodes.contains(Second->ID)) {
fail(Pair.Range, "macro fusion opcode pair must belong to the rule opcode sets");
return false;
}
const std::uint64_t Key = (static_cast<std::uint64_t>(First->ID) << 32U) | Second->ID;
if (!OpcodePairs.insert(Key).second) {
fail(Pair.Range, "macro fusion opcode pairs must be distinct");
return false;
}
Normalized.OpcodePairs.push_back({First->ID, Second->ID});
}
for (const SourceMacroFusionImmediatePredicate &Predicate : Rule.ImmediatePredicates) {
const auto Side = normalizeInstructionSide(Predicate.Instruction);
const auto &Instructions =
Side == NormalizedMacroFusionInstruction::First ? FirstInstructions : SecondInstructions;
if (!Side || Predicate.Minimum > Predicate.Maximum ||
!AllHaveOperandKind(Instructions, Predicate.OperandIndex, "Immediate")) {
fail(
Predicate.Range,
"macro fusion immediate predicate requires a valid side, range, and immediate operand");
return false;
}
Normalized.ImmediatePredicates.push_back(
{*Side, Predicate.OperandIndex, Predicate.Minimum, Predicate.Maximum});
}
for (const SourceMacroFusionRegisterInequality &Predicate : Rule.RegisterInequalities) {
const auto Side = normalizeInstructionSide(Predicate.Instruction);
const auto &Instructions =
Side == NormalizedMacroFusionInstruction::First ? FirstInstructions : SecondInstructions;
if (!Side || Predicate.LeftOperand == Predicate.RightOperand ||
!AllHaveOperandKind(Instructions, Predicate.LeftOperand, "Register") ||
!AllHaveOperandKind(Instructions, Predicate.RightOperand, "Register")) {
fail(
Predicate.Range,
"macro fusion register inequality requires distinct register operands on a valid side");
return false;
}
Normalized.RegisterInequalities.push_back(
{*Side, Predicate.LeftOperand, Predicate.RightOperand});
}
for (const SourceMacroFusionImmediateRelation &Relation : Rule.ImmediateRelations) {
if (Relation.Kind != "less_equal" ||
!AllHaveOperandKind(FirstInstructions, Relation.FirstOperand, "Immediate") ||
!AllHaveOperandKind(SecondInstructions, Relation.SecondOperand, "Immediate")) {
fail(Relation.Range,
"macro fusion immediate relation must be less_equal over immediate operands");
return false;
}
Normalized.ImmediateRelations.push_back({Relation.FirstOperand, Relation.SecondOperand});
}
Result.MacroFusionRules.push_back(std::move(Normalized));
}
return true;
}
} // namespace rcc::targetgen
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