shader: Properly store phi on Inst

This commit is contained in:
ReinUsesLisp 2021-02-06 02:38:22 -03:00 committed by ameerj
parent 16cb00c521
commit da8096e6e3
6 changed files with 132 additions and 75 deletions

View file

@ -129,28 +129,23 @@ std::string DumpBlock(const Block& block, const std::map<const Block*, size_t>&
} else { } else {
ret += fmt::format(" {}", op); // '%00000 = ' -> 1 + 5 + 3 = 9 spaces ret += fmt::format(" {}", op); // '%00000 = ' -> 1 + 5 + 3 = 9 spaces
} }
if (op == Opcode::Phi) {
size_t val_index{0};
for (const auto& [phi_block, phi_val] : inst.PhiOperands()) {
ret += val_index != 0 ? ", " : " ";
ret += fmt::format("[ {}, {} ]", ArgToIndex(block_to_index, inst_to_index, phi_val),
BlockToIndex(block_to_index, phi_block));
++val_index;
}
} else {
const size_t arg_count{NumArgsOf(op)}; const size_t arg_count{NumArgsOf(op)};
for (size_t arg_index = 0; arg_index < arg_count; ++arg_index) { for (size_t arg_index = 0; arg_index < arg_count; ++arg_index) {
const Value arg{inst.Arg(arg_index)}; const Value arg{inst.Arg(arg_index)};
const std::string arg_str{ArgToIndex(block_to_index, inst_to_index, arg)};
ret += arg_index != 0 ? ", " : " "; ret += arg_index != 0 ? ", " : " ";
ret += ArgToIndex(block_to_index, inst_to_index, arg); if (op == Opcode::Phi) {
ret += fmt::format("[ {}, {} ]", arg_index,
BlockToIndex(block_to_index, inst.PhiBlock(arg_index)));
} else {
ret += arg_str;
}
const Type actual_type{arg.Type()}; const Type actual_type{arg.Type()};
const Type expected_type{ArgTypeOf(op, arg_index)}; const Type expected_type{ArgTypeOf(op, arg_index)};
if (!AreTypesCompatible(actual_type, expected_type)) { if (!AreTypesCompatible(actual_type, expected_type)) {
ret += fmt::format("<type error: {} != {}>", actual_type, expected_type); ret += fmt::format("<type error: {} != {}>", actual_type, expected_type);
} }
} }
}
if (TypeOf(op) != Type::Void) { if (TypeOf(op) != Type::Void) {
ret += fmt::format(" (uses: {})\n", inst.UseCount()); ret += fmt::format(" (uses: {})\n", inst.UseCount());
} else { } else {

View file

@ -3,6 +3,7 @@
// Refer to the license.txt file included. // Refer to the license.txt file included.
#include <algorithm> #include <algorithm>
#include <memory>
#include "shader_recompiler/exception.h" #include "shader_recompiler/exception.h"
#include "shader_recompiler/frontend/ir/microinstruction.h" #include "shader_recompiler/frontend/ir/microinstruction.h"
@ -30,6 +31,22 @@ static void RemovePseudoInstruction(IR::Inst*& inst, IR::Opcode expected_opcode)
inst = nullptr; inst = nullptr;
} }
Inst::Inst(IR::Opcode op_, u64 flags_) noexcept : op{op_}, flags{flags_} {
if (op == Opcode::Phi) {
std::construct_at(&phi_args);
} else {
std::construct_at(&args);
}
}
Inst::~Inst() {
if (op == Opcode::Phi) {
std::destroy_at(&phi_args);
} else {
std::destroy_at(&args);
}
}
bool Inst::MayHaveSideEffects() const noexcept { bool Inst::MayHaveSideEffects() const noexcept {
switch (op) { switch (op) {
case Opcode::Branch: case Opcode::Branch:
@ -71,7 +88,10 @@ bool Inst::IsPseudoInstruction() const noexcept {
} }
} }
bool Inst::AreAllArgsImmediates() const noexcept { bool Inst::AreAllArgsImmediates() const {
if (op == Opcode::Phi) {
throw LogicError("Testing for all arguments are immediates on phi instruction");
}
return std::all_of(args.begin(), args.begin() + NumArgs(), return std::all_of(args.begin(), args.begin() + NumArgs(),
[](const IR::Value& value) { return value.IsImmediate(); }); [](const IR::Value& value) { return value.IsImmediate(); });
} }
@ -101,7 +121,7 @@ Inst* Inst::GetAssociatedPseudoOperation(IR::Opcode opcode) {
} }
size_t Inst::NumArgs() const { size_t Inst::NumArgs() const {
return NumArgsOf(op); return op == Opcode::Phi ? phi_args.size() : NumArgsOf(op);
} }
IR::Type Inst::Type() const { IR::Type Inst::Type() const {
@ -109,13 +129,23 @@ IR::Type Inst::Type() const {
} }
Value Inst::Arg(size_t index) const { Value Inst::Arg(size_t index) const {
if (op == Opcode::Phi) {
if (index >= phi_args.size()) {
throw InvalidArgument("Out of bounds argument index {} in phi instruction", index);
}
return phi_args[index].second;
} else {
if (index >= NumArgsOf(op)) { if (index >= NumArgsOf(op)) {
throw InvalidArgument("Out of bounds argument index {} in opcode {}", index, op); throw InvalidArgument("Out of bounds argument index {} in opcode {}", index, op);
} }
return args[index]; return args[index];
}
} }
void Inst::SetArg(size_t index, Value value) { void Inst::SetArg(size_t index, Value value) {
if (op == Opcode::Phi) {
throw LogicError("Setting argument on a phi instruction");
}
if (index >= NumArgsOf(op)) { if (index >= NumArgsOf(op)) {
throw InvalidArgument("Out of bounds argument index {} in opcode {}", index, op); throw InvalidArgument("Out of bounds argument index {} in opcode {}", index, op);
} }
@ -128,15 +158,21 @@ void Inst::SetArg(size_t index, Value value) {
args[index] = value; args[index] = value;
} }
std::span<const std::pair<Block*, Value>> Inst::PhiOperands() const noexcept { Block* Inst::PhiBlock(size_t index) const {
return phi_operands; if (op != Opcode::Phi) {
throw LogicError("{} is not a Phi instruction", op);
}
if (index >= phi_args.size()) {
throw InvalidArgument("Out of bounds argument index {} in phi instruction");
}
return phi_args[index].first;
} }
void Inst::AddPhiOperand(Block* predecessor, const Value& value) { void Inst::AddPhiOperand(Block* predecessor, const Value& value) {
if (!value.IsImmediate()) { if (!value.IsImmediate()) {
Use(value); Use(value);
} }
phi_operands.emplace_back(predecessor, value); phi_args.emplace_back(predecessor, value);
} }
void Inst::Invalidate() { void Inst::Invalidate() {
@ -145,18 +181,22 @@ void Inst::Invalidate() {
} }
void Inst::ClearArgs() { void Inst::ClearArgs() {
if (op == Opcode::Phi) {
for (auto& pair : phi_args) {
IR::Value& value{pair.second};
if (!value.IsImmediate()) {
UndoUse(value);
}
}
phi_args.clear();
} else {
for (auto& value : args) { for (auto& value : args) {
if (!value.IsImmediate()) { if (!value.IsImmediate()) {
UndoUse(value); UndoUse(value);
} }
value = {}; value = {};
} }
for (auto& [phi_block, phi_op] : phi_operands) {
if (!phi_op.IsImmediate()) {
UndoUse(phi_op);
} }
}
phi_operands.clear();
} }
void Inst::ReplaceUsesWith(Value replacement) { void Inst::ReplaceUsesWith(Value replacement) {
@ -167,24 +207,29 @@ void Inst::ReplaceUsesWith(Value replacement) {
if (!replacement.IsImmediate()) { if (!replacement.IsImmediate()) {
Use(replacement); Use(replacement);
} }
if (op == Opcode::Phi) {
phi_args[0].second = replacement;
} else {
args[0] = replacement; args[0] = replacement;
}
} }
void Inst::Use(const Value& value) { void Inst::Use(const Value& value) {
++value.Inst()->use_count; Inst* const inst{value.Inst()};
++inst->use_count;
switch (op) { switch (op) {
case Opcode::GetZeroFromOp: case Opcode::GetZeroFromOp:
SetPseudoInstruction(value.Inst()->zero_inst, this); SetPseudoInstruction(inst->zero_inst, this);
break; break;
case Opcode::GetSignFromOp: case Opcode::GetSignFromOp:
SetPseudoInstruction(value.Inst()->sign_inst, this); SetPseudoInstruction(inst->sign_inst, this);
break; break;
case Opcode::GetCarryFromOp: case Opcode::GetCarryFromOp:
SetPseudoInstruction(value.Inst()->carry_inst, this); SetPseudoInstruction(inst->carry_inst, this);
break; break;
case Opcode::GetOverflowFromOp: case Opcode::GetOverflowFromOp:
SetPseudoInstruction(value.Inst()->overflow_inst, this); SetPseudoInstruction(inst->overflow_inst, this);
break; break;
default: default:
break; break;
@ -192,20 +237,21 @@ void Inst::Use(const Value& value) {
} }
void Inst::UndoUse(const Value& value) { void Inst::UndoUse(const Value& value) {
--value.Inst()->use_count; Inst* const inst{value.Inst()};
--inst->use_count;
switch (op) { switch (op) {
case Opcode::GetZeroFromOp: case Opcode::GetZeroFromOp:
RemovePseudoInstruction(value.Inst()->zero_inst, Opcode::GetZeroFromOp); RemovePseudoInstruction(inst->zero_inst, Opcode::GetZeroFromOp);
break; break;
case Opcode::GetSignFromOp: case Opcode::GetSignFromOp:
RemovePseudoInstruction(value.Inst()->sign_inst, Opcode::GetSignFromOp); RemovePseudoInstruction(inst->sign_inst, Opcode::GetSignFromOp);
break; break;
case Opcode::GetCarryFromOp: case Opcode::GetCarryFromOp:
RemovePseudoInstruction(value.Inst()->carry_inst, Opcode::GetCarryFromOp); RemovePseudoInstruction(inst->carry_inst, Opcode::GetCarryFromOp);
break; break;
case Opcode::GetOverflowFromOp: case Opcode::GetOverflowFromOp:
RemovePseudoInstruction(value.Inst()->overflow_inst, Opcode::GetOverflowFromOp); RemovePseudoInstruction(inst->overflow_inst, Opcode::GetOverflowFromOp);
break; break;
default: default:
break; break;

View file

@ -6,8 +6,8 @@
#include <array> #include <array>
#include <cstring> #include <cstring>
#include <span>
#include <type_traits> #include <type_traits>
#include <utility>
#include <vector> #include <vector>
#include <boost/intrusive/list.hpp> #include <boost/intrusive/list.hpp>
@ -25,7 +25,14 @@ constexpr size_t MAX_ARG_COUNT = 4;
class Inst : public boost::intrusive::list_base_hook<> { class Inst : public boost::intrusive::list_base_hook<> {
public: public:
explicit Inst(Opcode op_, u64 flags_) noexcept : op{op_}, flags{flags_} {} explicit Inst(Opcode op_, u64 flags_) noexcept;
~Inst();
Inst& operator=(const Inst&) = delete;
Inst(const Inst&) = delete;
Inst& operator=(Inst&&) = delete;
Inst(Inst&&) = delete;
/// Get the number of uses this instruction has. /// Get the number of uses this instruction has.
[[nodiscard]] int UseCount() const noexcept { [[nodiscard]] int UseCount() const noexcept {
@ -50,26 +57,26 @@ public:
[[nodiscard]] bool IsPseudoInstruction() const noexcept; [[nodiscard]] bool IsPseudoInstruction() const noexcept;
/// Determines if all arguments of this instruction are immediates. /// Determines if all arguments of this instruction are immediates.
[[nodiscard]] bool AreAllArgsImmediates() const noexcept; [[nodiscard]] bool AreAllArgsImmediates() const;
/// Determines if there is a pseudo-operation associated with this instruction. /// Determines if there is a pseudo-operation associated with this instruction.
[[nodiscard]] bool HasAssociatedPseudoOperation() const noexcept; [[nodiscard]] bool HasAssociatedPseudoOperation() const noexcept;
/// Gets a pseudo-operation associated with this instruction /// Gets a pseudo-operation associated with this instruction
[[nodiscard]] Inst* GetAssociatedPseudoOperation(IR::Opcode opcode); [[nodiscard]] Inst* GetAssociatedPseudoOperation(IR::Opcode opcode);
/// Get the number of arguments this instruction has.
[[nodiscard]] size_t NumArgs() const;
/// Get the type this instruction returns. /// Get the type this instruction returns.
[[nodiscard]] IR::Type Type() const; [[nodiscard]] IR::Type Type() const;
/// Get the number of arguments this instruction has.
[[nodiscard]] size_t NumArgs() const;
/// Get the value of a given argument index. /// Get the value of a given argument index.
[[nodiscard]] Value Arg(size_t index) const; [[nodiscard]] Value Arg(size_t index) const;
/// Set the value of a given argument index. /// Set the value of a given argument index.
void SetArg(size_t index, Value value); void SetArg(size_t index, Value value);
/// Get an immutable span to the phi operands. /// Get a pointer to the block of a phi argument.
[[nodiscard]] std::span<const std::pair<Block*, Value>> PhiOperands() const noexcept; [[nodiscard]] Block* PhiBlock(size_t index) const;
/// Add phi operand to a phi instruction. /// Add phi operand to a phi instruction.
void AddPhiOperand(Block* predecessor, const Value& value); void AddPhiOperand(Block* predecessor, const Value& value);
@ -87,18 +94,26 @@ public:
} }
private: private:
struct NonTriviallyDummy {
NonTriviallyDummy() noexcept {}
};
void Use(const Value& value); void Use(const Value& value);
void UndoUse(const Value& value); void UndoUse(const Value& value);
IR::Opcode op{}; IR::Opcode op{};
int use_count{}; int use_count{};
std::array<Value, MAX_ARG_COUNT> args{}; u64 flags{};
union {
NonTriviallyDummy dummy{};
std::array<Value, MAX_ARG_COUNT> args;
std::vector<std::pair<Block*, Value>> phi_args;
};
Inst* zero_inst{}; Inst* zero_inst{};
Inst* sign_inst{}; Inst* sign_inst{};
Inst* carry_inst{}; Inst* carry_inst{};
Inst* overflow_inst{}; Inst* overflow_inst{};
std::vector<std::pair<Block*, Value>> phi_operands;
u64 flags{};
}; };
static_assert(sizeof(Inst) <= 128, "Inst size unintentionally increased its size");
} // namespace Shader::IR } // namespace Shader::IR

View file

@ -3,9 +3,9 @@
// Refer to the license.txt file included. // Refer to the license.txt file included.
// opcode name, return type, arg1 type, arg2 type, arg3 type, arg4 type, ... // opcode name, return type, arg1 type, arg2 type, arg3 type, arg4 type, ...
OPCODE(Phi, Opaque, )
OPCODE(Void, Void, ) OPCODE(Void, Void, )
OPCODE(Identity, Opaque, Opaque, ) OPCODE(Identity, Opaque, Opaque, )
OPCODE(Phi, Opaque, /*todo*/ )
// Control flow // Control flow
OPCODE(Branch, Void, Label, ) OPCODE(Branch, Void, Label, )

View file

@ -104,32 +104,34 @@ private:
val = ReadVariable(variable, preds.front()); val = ReadVariable(variable, preds.front());
} else { } else {
// Break potential cycles with operandless phi // Break potential cycles with operandless phi
val = IR::Value{&*block->PrependNewInst(block->begin(), IR::Opcode::Phi)}; IR::Inst& phi_inst{*block->PrependNewInst(block->begin(), IR::Opcode::Phi)};
val = IR::Value{&phi_inst};
WriteVariable(variable, block, val); WriteVariable(variable, block, val);
val = AddPhiOperands(variable, val, block); val = AddPhiOperands(variable, phi_inst, block);
} }
WriteVariable(variable, block, val); WriteVariable(variable, block, val);
return val; return val;
} }
IR::Value AddPhiOperands(auto variable, const IR::Value& phi, IR::Block* block) { IR::Value AddPhiOperands(auto variable, IR::Inst& phi, IR::Block* block) {
for (IR::Block* const pred : block->ImmediatePredecessors()) { for (IR::Block* const pred : block->ImmediatePredecessors()) {
phi.Inst()->AddPhiOperand(pred, ReadVariable(variable, pred)); phi.AddPhiOperand(pred, ReadVariable(variable, pred));
} }
return TryRemoveTrivialPhi(phi, block, UndefOpcode(variable)); return TryRemoveTrivialPhi(phi, block, UndefOpcode(variable));
} }
IR::Value TryRemoveTrivialPhi(const IR::Value& phi, IR::Block* block, IR::Opcode undef_opcode) { IR::Value TryRemoveTrivialPhi(IR::Inst& phi, IR::Block* block, IR::Opcode undef_opcode) {
IR::Value same; IR::Value same;
for (const auto& pair : phi.Inst()->PhiOperands()) { const size_t num_args{phi.NumArgs()};
const IR::Value& op{pair.second}; for (size_t arg_index = 0; arg_index < num_args; ++arg_index) {
if (op == same || op == phi) { const IR::Value& op{phi.Arg(arg_index)};
if (op == same || op == IR::Value{&phi}) {
// Unique value or self-reference // Unique value or self-reference
continue; continue;
} }
if (!same.IsEmpty()) { if (!same.IsEmpty()) {
// The phi merges at least two values: not trivial // The phi merges at least two values: not trivial
return phi; return IR::Value{&phi};
} }
same = op; same = op;
} }
@ -139,7 +141,7 @@ private:
same = IR::Value{&*block->PrependNewInst(first_not_phi, undef_opcode)}; same = IR::Value{&*block->PrependNewInst(first_not_phi, undef_opcode)};
} }
// Reroute all uses of phi to same and remove phi // Reroute all uses of phi to same and remove phi
phi.Inst()->ReplaceUsesWith(same); phi.ReplaceUsesWith(same);
// TODO: Try to recursively remove all phi users, which might have become trivial // TODO: Try to recursively remove all phi users, which might have become trivial
return same; return same;
} }

View file

@ -6,6 +6,7 @@
#include <memory> #include <memory>
#include <type_traits> #include <type_traits>
#include <utility>
namespace Shader { namespace Shader {
@ -31,14 +32,12 @@ public:
void ReleaseContents() { void ReleaseContents() {
Chunk* chunk{&root}; Chunk* chunk{&root};
if (chunk) { while (chunk) {
const size_t free_objects{chunk->free_objects}; if (chunk->free_objects == chunk_size) {
if (free_objects == chunk_size) {
break; break;
} }
chunk->free_objects = chunk_size; for (; chunk->free_objects < chunk_size; ++chunk->free_objects) {
for (size_t obj_id = free_objects; obj_id < chunk_size; ++obj_id) { chunk->storage[chunk->free_objects].object.~T();
chunk->storage[obj_id].object.~T();
} }
chunk = chunk->next.get(); chunk = chunk->next.get();
} }