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shader: propagate late constants through affected IR users

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This commit is contained in:
nmzik
2026-10-12 18:17:24 +02:00
parent fa68e104ea
commit df08b83287
2 changed files with 196 additions and 34 deletions
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src/graphics/shader/recompiler/ir/passes/ConstantPropagation.cpp
+115 -34
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@@ -22,6 +22,59 @@ void Replace(Inst& inst, Value value) {
inst.ReplaceUsesWith(value.Resolve());
}
class FoldWorklist {
public:
struct Location {
Block::iterator instruction;
uint64_t visited = 0;
bool queued = false;
};
void Register(Block::iterator instruction) {
locations.emplace(&*instruction, Location {instruction});
Queue(&*instruction);
}
void Queue(Inst* inst) {
const auto found = locations.find(inst);
if (found != locations.end() && !found->second.queued) {
found->second.queued = true;
pending.push_back(inst);
}
}
void QueueUsers(const std::vector<Use>& users) {
++generation;
affected.clear();
for (const auto& use: users) affected.push_back(use.user);
// Pattern folds inspect nested operands even when intermediate operations
// stay dynamic. Visit consumers once per change, including cyclic Phi edges.
for (size_t i = 0; i < affected.size(); ++i) {
auto* inst = affected[i];
const auto found = locations.find(inst);
if (found == locations.end() || found->second.visited == generation) continue;
found->second.visited = generation;
Queue(inst);
for (const auto& use: inst->Uses()) affected.push_back(use.user);
}
}
Block::iterator Prepend(Block& block, Block::iterator before, ValueOpcode opcode,
std::initializer_list<Value> args = {}) {
const auto result = block.PrependNewInst(before, opcode, args);
Register(result);
return result;
}
std::unordered_map<Inst*, Location> locations;
std::vector<Inst*> pending;
std::unordered_set<Inst*> lowered_ancillary;
private:
std::vector<Inst*> affected;
uint64_t generation = 0;
};
template <typename Function>
bool FoldU32(Inst& inst, Function function) {
const auto lhs = Arg(inst, 0);
@@ -196,7 +249,7 @@ bool FoldCompositeExtract(Inst& inst, ValueOpcode construct, size_t components)
}
void FoldInstruction(Block& block, Block::iterator instruction,
std::unordered_set<Inst*>& lowered_ancillary) {
FoldWorklist& worklist) {
auto& inst = *instruction;
switch (inst.GetOpcode()) {
case ValueOpcode::StoreBufferU32: {
@@ -208,7 +261,7 @@ void FoldInstruction(Block& block, Block::iterator instruction,
case ValueOpcode::SelectU1:
if (!FoldSelect(inst) && IsImmediate(Arg(inst, 2), Type::U1) &&
!Arg(inst, 2).U1()) {
auto result = block.PrependNewInst(instruction, ValueOpcode::LogicalAnd,
auto result = worklist.Prepend(block, instruction, ValueOpcode::LogicalAnd,
{Arg(inst, 0), Arg(inst, 1)});
Replace(inst, Value(&*result));
}
@@ -224,8 +277,8 @@ void FoldInstruction(Block& block, Block::iterator instruction,
case 0u: Replace(inst, Value(false)); break;
case 0x3ffu: Replace(inst, Value(true)); break;
case 3u: {
const auto result = block.PrependNewInst(
instruction, ValueOpcode::FPIsNan32, {Arg(inst, 0)});
const auto result = worklist.Prepend(
block, instruction, ValueOpcode::FPIsNan32, {Arg(inst, 0)});
Replace(inst, Value(&*result));
break;
}
@@ -280,12 +333,12 @@ void FoldInstruction(Block& block, Block::iterator instruction,
if (offset.U32() >= field.start && offset.U32() < field.end &&
count.U32() <= field.end - offset.U32()) {
// Preserve extraction and sign extension while exposing only the used field.
const auto input = block.PrependNewInst(
instruction, ValueOpcode::GetBuiltin,
const auto input = worklist.Prepend(
block, instruction, ValueOpcode::GetBuiltin,
{Value(static_cast<uint32_t>(field.kind)), Value(0u)});
inst.SetArg(0, Value(&*input));
inst.SetArg(1, Value(offset.U32() - field.start));
lowered_ancillary.insert(source);
worklist.lowered_ancillary.insert(source);
return;
}
}
@@ -710,8 +763,7 @@ void FoldInstruction(Block& block, Block::iterator instruction,
// ballot projection also survives scalar EXEC operations and loop-carried mask Phis.
class LaneMaskProjection {
public:
explicit LaneMaskProjection(std::unordered_set<Inst*>& lowered_ancillary)
: m_lowered_ancillary(lowered_ancillary) {}
explicit LaneMaskProjection(FoldWorklist& worklist): m_worklist(worklist) {}
void Fold(Inst& inst, uint32_t wave_size) {
if (inst.GetOpcode() != ValueOpcode::INotEqual32 || !Immediate(Arg(inst, 1), 0u)) return;
@@ -778,19 +830,18 @@ private:
if (const auto found = m_values.find(source); found != m_values.end()) return found->second.Resolve();
if (const auto predicate = BallotPredicate(*source); !predicate.IsEmpty()) return predicate;
auto* block = source->Parent();
const auto where = std::find_if(block->begin(), block->end(),
[source](const Inst& candidate) { return &candidate == source; });
const auto where = m_worklist.locations.at(source).instruction;
const auto op = source->GetOpcode() == ValueOpcode::BitwiseAnd32 ? ValueOpcode::LogicalAnd
: source->GetOpcode() == ValueOpcode::BitwiseOr32 ? ValueOpcode::LogicalOr
: source->GetOpcode() == ValueOpcode::BitwiseNot32 ? ValueOpcode::LogicalNot
: source->GetOpcode() == ValueOpcode::SelectU32 ? ValueOpcode::SelectU1
: ValueOpcode::Phi;
auto result = op == ValueOpcode::Phi ? block->PrependNewInst(where, op)
auto result = op == ValueOpcode::Phi ? m_worklist.Prepend(*block, where, op)
: op == ValueOpcode::LogicalNot
? block->PrependNewInst(where, op, {Value(false)})
? m_worklist.Prepend(*block, where, op, {Value(false)})
: op == ValueOpcode::SelectU1
? block->PrependNewInst(where, op, {Arg(*source, 0), Value(false), Value(false)})
: block->PrependNewInst(where, op, {Value(false), Value(false)});
? m_worklist.Prepend(*block, where, op, {Arg(*source, 0), Value(false), Value(false)})
: m_worklist.Prepend(*block, where, op, {Value(false), Value(false)});
m_values.emplace(source, Value(&*result));
if (op == ValueOpcode::Phi) result->SetFlags(Type::U1);
for (size_t arg = op == ValueOpcode::SelectU1 ? 1u : 0u; arg < source->NumArgs(); ++arg) {
@@ -798,11 +849,11 @@ private:
if (op == ValueOpcode::Phi) result->AddPhiOperand(source->PhiBlock(arg), projected);
else result->SetArg(arg, projected);
}
FoldInstruction(*block, result, m_lowered_ancillary);
FoldInstruction(*block, result, m_worklist);
return Value(&*result).Resolve();
}
std::unordered_set<Inst*>& m_lowered_ancillary;
FoldWorklist& m_worklist;
std::unordered_set<const Inst*> m_visited;
std::unordered_map<const Inst*, Value> m_values;
bool m_grounded = false;
@@ -811,29 +862,59 @@ private:
} // namespace
void ConstantPropagationPass(const BlockList& blocks, uint32_t wave_size) {
std::unordered_set<Inst*> lowered_ancillary;
LaneMaskProjection mask_projection(lowered_ancillary);
for (auto* block: blocks) {
for (auto inst = block->begin(); inst != block->end(); ++inst) {
FoldWorklist worklist;
LaneMaskProjection mask_projection(worklist);
for (auto* block: blocks)
for (auto inst = block->begin(); inst != block->end(); ++inst) worklist.Register(inst);
std::vector<Use> users;
std::vector<Value> operands;
const auto drain = [&] {
for (size_t i = 0; i < worklist.pending.size(); ++i) {
auto* inst = worklist.pending[i];
auto& location = worklist.locations.at(inst);
location.queued = false;
const auto opcode = inst->GetOpcode();
if (opcode == ValueOpcode::Identity || opcode == ValueOpcode::Void) continue;
const auto where = location.instruction;
users.assign(inst->Uses().begin(), inst->Uses().end());
operands.clear();
for (size_t arg = 0; arg < inst->NumArgs(); ++arg) operands.push_back(inst->Arg(arg));
mask_projection.Fold(*inst, wave_size);
FoldInstruction(*block, inst, lowered_ancillary);
FoldInstruction(*inst->Parent(), where, worklist);
bool changed = opcode != inst->GetOpcode() || operands.size() != inst->NumArgs();
for (size_t arg = 0; !changed && arg < operands.size(); ++arg)
changed = operands[arg] != inst->Arg(arg);
if (changed) {
worklist.QueueUsers(users);
worklist.Queue(inst);
}
}
}
worklist.pending.clear();
};
drain();
// Normalize retained PHI/select values only after every supported field read has
// been lowered; direct raw consumers remain unsupported.
for (auto* source: lowered_ancillary) {
const bool retained_only = std::ranges::all_of(source->Uses(), [](const Use& use) {
const auto& user = *use.user;
if (!user.HasUses() && !user.MayHaveSideEffects()) {
return true;
bool normalized;
do {
normalized = false;
for (auto* source: worklist.lowered_ancillary) {
if (source->GetOpcode() == ValueOpcode::Identity) continue;
const bool retained_only = std::ranges::all_of(source->Uses(), [](const Use& use) {
const auto& user = *use.user;
if (!user.HasUses() && !user.MayHaveSideEffects()) {
return true;
}
return user.GetOpcode() == ValueOpcode::Phi ||
(user.GetOpcode() == ValueOpcode::SelectU32 && use.operand == 2u);
});
if (retained_only) {
worklist.QueueUsers(source->Uses());
Replace(*source, Value(0u));
normalized = true;
}
return user.GetOpcode() == ValueOpcode::Phi ||
(user.GetOpcode() == ValueOpcode::SelectU32 && use.operand == 2u);
});
if (retained_only) {
Replace(*source, Value(0u));
}
}
drain();
} while (normalized);
}
} // namespace Libs::Graphics::ShaderRecompiler::IR