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refactor(shader): reduce dispatcher state overhead

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This commit is contained in:
nmzik
2026-08-19 10:56:38 +02:00
parent 6e9f162bd4
commit 87166eed94
9 changed files with 557 additions and 124 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterProgram.cpp
+40 -65
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@@ -36,24 +36,9 @@ void EmitKillIfPixelValidMaskInactive(EmitterState& state) {
EmitKillIfBoolFalse(state, active);
}
uint32_t SpillPointerType(EmitterState& state, IR::Type type) {
switch (type) {
case IR::Type::U1: return TypePointer(state, StorageClassFunction, TypeBool(state));
case IR::Type::U8:
case IR::Type::U16:
case IR::Type::U32:
case IR::Type::F16: return TypePointer(state, StorageClassFunction, TypeU32(state));
case IR::Type::F32: return TypePointer(state, StorageClassFunction, TypeF32(state));
case IR::Type::U64: return TypePointer(state, StorageClassFunction, TypeU64(state));
case IR::Type::U32x2: return TypePointer(state, StorageClassFunction, TypeU32Pair(state));
case IR::Type::U32x3:
return TypePointer(state, StorageClassFunction, TypeU32Vector(state, 3));
case IR::Type::U32x4:
return TypePointer(state, StorageClassFunction, TypeU32Vector(state, 4));
case IR::Type::F32x2:
return TypePointer(state, StorageClassFunction, TypeF32Vector(state, 2));
default: return 0;
}
uint32_t SpillPointerType(ValueEmitContext& ctx, IR::Type type) {
const auto value_type = ctx.TypeId(type);
return value_type == 0 ? 0 : TypePointer(ctx.state, StorageClassFunction, value_type);
}
struct DeferredPhiPatch {
@@ -68,10 +53,8 @@ struct StructuredFunctionState {
struct DispatcherFunctionState {
std::unordered_map<const IR::Inst*, uint32_t> spills;
uint32_t pc_variable = 0;
uint32_t header_label = 0;
uint32_t select_label = 0;
uint32_t default_label = 0;
uint32_t after_switch_label = 0;
uint32_t continue_label = 0;
uint32_t merge_label = 0;
@@ -166,16 +149,13 @@ void EmitDispatcherTarget(ValueEmitContext& ctx, const DispatcherFunctionState&
}
}
void EmitDispatcherTerminator(ValueEmitContext& ctx, const DispatcherFunctionState& dispatcher,
const IR::Block* block, const IR::ValueBlockInfo& info,
uint32_t exit_label) {
uint32_t EmitDispatcherNextPc(ValueEmitContext& ctx, const DispatcherFunctionState& dispatcher,
const IR::Block* block, const IR::ValueBlockInfo& info) {
const auto& term = info.terminator;
switch (term.kind) {
case CFG::TerminatorKind::Branch:
EmitDispatcherTarget(ctx, dispatcher, block, term.true_block);
ctx.state.builder.AddFunction(
{OpStore, dispatcher.pc_variable, ConstantU32(ctx.state, term.true_block)});
break;
return ConstantU32(ctx.state, term.true_block);
case CFG::TerminatorKind::ConditionalBranch: {
EmitDispatcherTarget(ctx, dispatcher, block, term.true_block);
EmitDispatcherTarget(ctx, dispatcher, block, term.false_block);
@@ -184,16 +164,12 @@ void EmitDispatcherTerminator(ValueEmitContext& ctx, const DispatcherFunctionSta
ctx.Def(info.condition),
ConstantU32(ctx.state, term.true_block),
ConstantU32(ctx.state, term.false_block)});
ctx.state.builder.AddFunction({OpStore, dispatcher.pc_variable, selected});
break;
return selected;
}
case CFG::TerminatorKind::IndirectBranch: {
for (const auto target: term.indirect_targets) {
EmitDispatcherTarget(ctx, dispatcher, block, target);
}
for (const auto target: term.indirect_selector_targets) {
EmitDispatcherTarget(ctx, dispatcher, block, target);
}
uint32_t selected = ConstantU32(ctx.state, UINT32_MAX);
if (!info.indirect_target.IsEmpty()) {
const auto selector = ctx.Def(info.indirect_target);
@@ -214,15 +190,10 @@ void EmitDispatcherTerminator(ValueEmitContext& ctx, const DispatcherFunctionSta
selected = next;
}
}
ctx.state.builder.AddFunction({OpStore, dispatcher.pc_variable, selected});
break;
return selected;
}
default:
ctx.state.builder.AddFunction(
{OpStore, dispatcher.pc_variable, ConstantU32(ctx.state, UINT32_MAX)});
break;
default: return ConstantU32(ctx.state, UINT32_MAX);
}
ctx.state.builder.AddFunction({OpBranch, exit_label});
}
bool EmitDirectInstruction(ValueEmitContext& ctx, const IR::Inst& inst) {
@@ -346,12 +317,16 @@ void EmitDispatcherFunction(ValueEmitContext& ctx, const DispatcherFunctionState
if (ctx.failed) {
return;
}
EmitDispatcherTerminator(ctx, dispatcher, entry, ctx.program.block_info.front(),
dispatcher.header_label);
const auto initial_pc =
EmitDispatcherNextPc(ctx, dispatcher, entry, ctx.program.block_info.front());
const auto initial_parent = state.current_label;
state.builder.AddFunction({OpBranch, dispatcher.header_label});
EmitLabel(state, dispatcher.header_label);
const auto pc = state.builder.AllocateId();
state.builder.AddFunction({OpLoad, TypeU32(state), pc, dispatcher.pc_variable});
const auto pc = state.builder.AllocateId();
const auto next_pc = state.builder.AllocateId();
state.builder.AddFunction({OpPhi, TypeU32(state), pc, initial_pc, initial_parent, next_pc,
dispatcher.continue_label});
const auto done = state.builder.AllocateId();
state.builder.AddFunction(
{OpIEqual, TypeBool(state), done, pc, ConstantU32(ctx.state, UINT32_MAX)});
@@ -363,16 +338,14 @@ void EmitDispatcherFunction(ValueEmitContext& ctx, const DispatcherFunctionState
EmitLabel(state, dispatcher.select_label);
state.builder.AddFunction(
{OpSelectionMerge, dispatcher.after_switch_label, SelectionControlNone});
std::vector<uint32_t> words {OpSwitch, pc, dispatcher.default_label};
std::vector<uint32_t> words {OpSwitch, pc, dispatcher.after_switch_label};
for (size_t index = 1; index < ctx.program.blocks.size(); index++) {
words.push_back(ctx.program.block_info[index].id);
words.push_back(ctx.Label(ctx.program.blocks[index]));
}
state.builder.AddFunction(words);
EmitLabel(state, dispatcher.default_label);
state.builder.AddFunction(
{OpStore, dispatcher.pc_variable, ConstantU32(ctx.state, UINT32_MAX)});
state.builder.AddFunction({OpBranch, dispatcher.after_switch_label});
std::vector<uint32_t> next_pc_words {OpPhi, TypeU32(state), next_pc,
ConstantU32(state, UINT32_MAX), dispatcher.select_label};
for (size_t index = 1; index < ctx.program.blocks.size() && !ctx.failed; index++) {
EmitBlock(ctx, ctx.program.blocks[index], [&](const IR::Inst& inst) {
@@ -381,13 +354,17 @@ void EmitDispatcherFunction(ValueEmitContext& ctx, const DispatcherFunctionState
if (ctx.failed) {
break;
}
EmitDispatcherTerminator(ctx, dispatcher, ctx.program.blocks[index],
ctx.program.block_info[index], dispatcher.after_switch_label);
const auto selected = EmitDispatcherNextPc(ctx, dispatcher, ctx.program.blocks[index],
ctx.program.block_info[index]);
next_pc_words.push_back(selected);
next_pc_words.push_back(state.current_label);
state.builder.AddFunction({OpBranch, dispatcher.after_switch_label});
}
if (ctx.failed) {
return;
}
EmitLabel(state, dispatcher.after_switch_label);
state.builder.AddFunction(next_pc_words);
state.builder.AddFunction({OpBranch, dispatcher.continue_label});
EmitLabel(state, dispatcher.continue_label);
state.builder.AddFunction({OpBranch, dispatcher.header_label});
@@ -438,8 +415,14 @@ uint32_t ValueEmitContext::Def(IR::Value value) {
if (dispatcher_spills != nullptr && current_block != nullptr &&
inst->Parent() != current_block) {
if (const auto found = dispatcher_spills->find(inst); found != dispatcher_spills->end()) {
if (const auto loaded = dispatcher_block_loads.find(inst);
loaded != dispatcher_block_loads.end() &&
loaded->second.first == state.current_label) {
return loaded->second.second;
}
const auto id = state.builder.AllocateId();
state.builder.AddFunction({OpLoad, TypeId(inst->GetType()), id, found->second});
dispatcher_block_loads.insert_or_assign(inst, std::pair {state.current_label, id});
return id;
}
}
@@ -515,10 +498,6 @@ uint32_t ValueEmitContext::Label(const IR::Block* block) const {
return labels.at(block);
}
size_t ValueEmitContext::BlockIndex(const IR::Block* block) const {
return static_cast<size_t>(std::ranges::find(program.blocks, block) - program.blocks.begin());
}
void ValueEmitContext::Fail(const IR::Inst& inst, const char* reason) {
failed = true;
error = fmt::format("typed opcode {} {}", IR::ValueOpcodeName(inst.GetOpcode()), reason);
@@ -534,14 +513,14 @@ bool EmitValueProgram(EmitterState& state, const IR::ValueProgram& program, std:
for (const auto* block: program.blocks) {
ctx.labels.emplace(block, state.builder.AllocateId());
}
if (program.dispatcher_fallback) {
if (state.program.dispatcher_fallback) {
auto& dispatch = dispatcher.emplace();
for (const auto* block: program.blocks) {
for (const auto& inst: *block) {
if (inst.GetOpcode() != IR::ValueOpcode::Phi) {
continue;
}
if (SpillPointerType(state, inst.GetType()) == 0) {
if (SpillPointerType(ctx, inst.GetType()) == 0) {
ctx.Fail(inst, "cannot be stored by the dispatcher");
break;
}
@@ -551,10 +530,11 @@ bool EmitValueProgram(EmitterState& state, const IR::ValueProgram& program, std:
const auto mark_cross_block = [&](IR::Value value, const IR::Block* consumer) {
value = value.Resolve();
const auto* definition = value.TryInstruction();
if (definition == nullptr || definition->Parent() == consumer) {
if (definition == nullptr || definition->Parent() == consumer ||
definition->Parent() == program.blocks.front()) {
return;
}
if (SpillPointerType(state, definition->GetType()) == 0) {
if (SpillPointerType(ctx, definition->GetType()) == 0) {
ctx.Fail(*definition, "cannot be stored by the dispatcher");
return;
}
@@ -575,10 +555,8 @@ bool EmitValueProgram(EmitterState& state, const IR::ValueProgram& program, std:
mark_cross_block(program.block_info[index].condition, program.blocks[index]);
mark_cross_block(program.block_info[index].indirect_target, program.blocks[index]);
}
dispatch.pc_variable = state.builder.AllocateId();
dispatch.header_label = state.builder.AllocateId();
dispatch.select_label = state.builder.AllocateId();
dispatch.default_label = state.builder.AllocateId();
dispatch.after_switch_label = state.builder.AllocateId();
dispatch.continue_label = state.builder.AllocateId();
dispatch.merge_label = state.builder.AllocateId();
@@ -610,15 +588,12 @@ bool EmitValueProgram(EmitterState& state, const IR::ValueProgram& program, std:
TypePointer(state, StorageClassFunction, TypeU32(state)),
state.pixel_valid_mask_variable, StorageClassFunction});
}
if (program.dispatcher_fallback) {
state.builder.AddFunction({OpVariable,
TypePointer(state, StorageClassFunction, TypeU32(state)),
dispatcher->pc_variable, StorageClassFunction});
if (state.program.dispatcher_fallback) {
for (const auto* block: program.blocks) {
for (const auto& inst: *block) {
if (const auto found = dispatcher->spills.find(&inst);
found != dispatcher->spills.end()) {
state.builder.AddFunction({OpVariable, SpillPointerType(state, inst.GetType()),
state.builder.AddFunction({OpVariable, SpillPointerType(ctx, inst.GetType()),
found->second, StorageClassFunction});
}
}
@@ -641,7 +616,7 @@ bool EmitValueProgram(EmitterState& state, const IR::ValueProgram& program, std:
EmitStorageBufferOffsets(state);
if (program.blocks.empty()) {
EmitReturn(ctx);
} else if (program.dispatcher_fallback) {
} else if (state.program.dispatcher_fallback) {
EmitDispatcherFunction(ctx, *dispatcher);
} else {
EmitStructuredFunction(ctx);