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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_CODEGEN_MACHINEANALYSES_H
#define RCC_CODEGEN_MACHINEANALYSES_H
#include "rcc/CodeGen/MachineBasicBlock.h"
#include "rcc/CodeGen/MachineIRTypes.h"
#include "rcc/CodeGen/MachinePass.h"
#include "rcc/CodeGen/StableID.h"
#include "rcc/Support/Error.h"
#include <cstddef>
#include <cstdint>
#include <span>
#include <string_view>
#include <unordered_map>
#include <unordered_set>
#include <vector>
namespace rcc {
class MachineBasicBlock;
class MachineFunction;
class MachineInstr;
class MachineMemOperand;
class TargetDescription;
class MachineDominatorTreeAnalysis final {
public:
class Result final {
public:
[[nodiscard]] bool isReachable(const MachineBasicBlock &Block) const noexcept;
[[nodiscard]] bool dominates(const MachineBasicBlock &Dominator,
const MachineBasicBlock &Block) const noexcept;
[[nodiscard]] bool dominates(const MachineInstr &Dominator,
const MachineInstr &Instruction) const noexcept;
[[nodiscard]] const MachineBasicBlock *
immediateDominator(const MachineBasicBlock &Block) const noexcept;
[[nodiscard]] const MachineBasicBlock *
nearestCommonDominator(const MachineBasicBlock &Left,
const MachineBasicBlock &Right) const noexcept;
[[nodiscard]] std::span<MachineBasicBlock *const> unreachableBlocks() const noexcept {
return UnreachableBlocks;
}
[[nodiscard]] Expected<void> updateAfterCFGChange(MachineFunction &Function);
private:
[[nodiscard]] Expected<void> build(MachineFunction &Function);
std::vector<MachineBasicBlock *> Blocks;
std::unordered_map<const MachineBasicBlock *, std::size_t> BlockToIndex;
std::vector<std::vector<bool>> Dominators;
std::vector<const MachineBasicBlock *> ImmediateDominators;
std::vector<bool> Reachable;
std::vector<MachineBasicBlock *> UnreachableBlocks;
friend class MachineDominatorTreeAnalysis;
};
[[nodiscard]] static constexpr std::string_view name() noexcept {
return "MachineDominatorTree";
}
[[nodiscard]] static Expected<Result>
run(MachineFunction &Function, const TargetDescription &Target, MachineAnalysisManager &Analyses);
};
struct MachineLoop final {
MachineBasicBlock *Header = nullptr;
std::vector<MachineBasicBlock *> Blocks;
std::vector<MachineBasicBlock *> Latches;
std::size_t Parent = static_cast<std::size_t>(-1);
std::vector<std::size_t> Children;
std::uint32_t Depth = 1;
};
struct IrreducibleMachineRegion final {
std::vector<MachineBasicBlock *> Blocks;
std::vector<MachineBasicBlock *> Entries;
};
class MachineLoopAnalysis final {
public:
class Result final {
public:
[[nodiscard]] std::span<const MachineLoop> loops() const noexcept {
return Loops;
}
[[nodiscard]] std::span<const IrreducibleMachineRegion> irreducibleRegions() const noexcept {
return IrreducibleRegions;
}
[[nodiscard]] const MachineLoop *loopFor(const MachineBasicBlock &Block) const noexcept;
[[nodiscard]] std::uint32_t loopDepth(const MachineBasicBlock &Block) const noexcept;
[[nodiscard]] bool isIrreducible(const MachineBasicBlock &Block) const noexcept;
private:
std::vector<MachineLoop> Loops;
std::vector<IrreducibleMachineRegion> IrreducibleRegions;
std::unordered_map<const MachineBasicBlock *, std::size_t> InnermostLoop;
std::unordered_set<const MachineBasicBlock *> IrreducibleBlocks;
friend class MachineLoopAnalysis;
};
[[nodiscard]] static constexpr std::string_view name() noexcept {
return "MachineLoopInfo";
}
[[nodiscard]] static Expected<Result>
run(MachineFunction &Function, const TargetDescription &Target, MachineAnalysisManager &Analyses);
};
class MachineBranchProbabilityAnalysis final {
public:
class Result final {
public:
[[nodiscard]] BranchProbability probability(const MachineBasicBlock &From,
const MachineBasicBlock &To) const noexcept;
[[nodiscard]] std::span<const MachineSuccessor>
successors(const MachineBasicBlock &Block) const noexcept;
private:
std::unordered_map<const MachineBasicBlock *, std::vector<MachineSuccessor>> Probabilities;
friend class MachineBranchProbabilityAnalysis;
};
[[nodiscard]] static constexpr std::string_view name() noexcept {
return "MachineBranchProbability";
}
[[nodiscard]] static Expected<Result>
run(MachineFunction &Function, const TargetDescription &Target, MachineAnalysisManager &Analyses);
};
class MachineBlockFrequencyAnalysis final {
public:
static constexpr std::uint64_t EntryFrequency = std::uint64_t{1} << 32U;
class Result final {
public:
[[nodiscard]] std::uint64_t frequency(const MachineBasicBlock &Block) const noexcept;
private:
std::unordered_map<const MachineBasicBlock *, std::uint64_t> Frequencies;
friend class MachineBlockFrequencyAnalysis;
};
[[nodiscard]] static constexpr std::string_view name() noexcept {
return "MachineBlockFrequency";
}
[[nodiscard]] static Expected<Result>
run(MachineFunction &Function, const TargetDescription &Target, MachineAnalysisManager &Analyses);
};
enum class MachineAliasResult : std::uint8_t {
NoAlias,
MayAlias,
PartialAlias,
MustAlias,
};
class MachineAliasAnalysis final {
public:
class Result final {
public:
[[nodiscard]] MachineAliasResult alias(const MachineMemOperand &Left,
const MachineMemOperand &Right) const noexcept;
};
[[nodiscard]] static constexpr std::string_view name() noexcept {
return "MachineAliasAnalysis";
}
[[nodiscard]] static Expected<Result>
run(MachineFunction &Function, const TargetDescription &Target, MachineAnalysisManager &Analyses);
};
enum class MachineMemoryDependencyKind : std::uint8_t {
Flow,
Anti,
Output,
Ordered,
};
struct MachineMemoryDependency final {
MachineInstrStableID Source;
MachineInstrStableID Destination;
MachineMemoryDependencyKind Kind = MachineMemoryDependencyKind::Ordered;
};
struct MachineMemoryDependenceRegion final {
const MachineBasicBlock *Block = nullptr;
std::vector<MachineInstrStableID> Instructions;
};
class MachineMemoryDependenceAnalysis final {
public:
class Result final {
public:
[[nodiscard]] std::span<const MachineMemoryDependenceRegion> regions() const noexcept {
return Regions;
}
[[nodiscard]] const MachineMemoryDependenceRegion *
regionFor(const MachineBasicBlock &Block) const noexcept;
[[nodiscard]] std::span<const MachineMemoryDependency>
dependencies(const MachineBasicBlock &Block) const noexcept;
[[nodiscard]] std::span<const MachineMemoryDependency>
dependencies(const MachineInstr &Instruction) const noexcept;
[[nodiscard]] std::span<const MachineMemoryDependency> allDependencies() const noexcept {
return Dependencies;
}
private:
struct Range final {
std::size_t Begin = 0;
std::size_t Size = 0;
};
std::vector<MachineMemoryDependency> Dependencies;
std::vector<MachineMemoryDependenceRegion> Regions;
std::unordered_map<const MachineBasicBlock *, std::size_t> BlockToRegion;
std::unordered_map<const MachineBasicBlock *, Range> BlockRanges;
std::unordered_map<MachineInstrStableID, Range> DestinationRanges;
friend class MachineMemoryDependenceAnalysis;
};
[[nodiscard]] static constexpr std::string_view name() noexcept {
return "MachineMemoryDependence";
}
[[nodiscard]] static Expected<Result>
run(MachineFunction &Function, const TargetDescription &Target, MachineAnalysisManager &Analyses);
};
[[nodiscard]] Expected<void> registerStage8MachineAnalyses(MachineAnalysisManager &Analyses);
} // namespace rcc
#endif // RCC_CODEGEN_MACHINEANALYSES_H
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