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shader: preserve folded control-flow values

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This commit is contained in:
nmzik
2026-08-22 03:31:59 +02:00
parent 9241fdc32a
commit d581703ab4
5 changed files with 54 additions and 8 deletions
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tests/ScalarProvenanceTests.cpp
+42
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@@ -402,6 +402,47 @@ void TestOptimizationPipeline() {
"elimination regressed");
}
void TestControlFlowValueSurvivesReadLaneFolding() {
Fixture fixture(3);
auto *entry = fixture.program.values->blocks[0];
auto *taken = fixture.program.values->blocks[1];
auto *other = fixture.program.values->blocks[2];
entry->AddBranch(taken);
entry->AddBranch(other);
auto &entry_info = fixture.program.values->block_info[0];
entry_info.terminator.kind =
Libs::Graphics::ShaderRecompiler::CFG::TerminatorKind::ConditionalBranch;
entry_info.terminator.true_block = 1;
entry_info.terminator.false_block = 2;
fixture.program.values->block_info[1].terminator.kind =
Libs::Graphics::ShaderRecompiler::CFG::TerminatorKind::Return;
fixture.program.values->block_info[2].terminator.kind =
Libs::Graphics::ShaderRecompiler::CFG::TerminatorKind::Return;
const auto undef = fixture.Emit(ValueOpcode::UndefU32);
const auto write = fixture.Emit(
ValueOpcode::WriteLane, {undef, Value(42u), Value(5u)});
const auto read =
fixture.Emit(ValueOpcode::ReadLane, {write, Value(5u)});
entry_info.condition =
fixture.Emit(ValueOpcode::IEqual32, {read, Value(42u)});
fixture.Emit(ValueOpcode::Reference, {entry_info.condition});
Check(EliminateReadLane(*fixture.program.values, 64).rewritten_reads == 1,
"control-flow fixture did not eliminate its fixed-lane read");
ConstantPropagationPass(fixture.program.values->blocks);
ResolveControlFlowIdentities(*fixture.program.values);
RemoveIdentities(fixture.program.values->blocks);
EliminateDeadCode(fixture.program.values->blocks);
std::string error;
Check(entry_info.condition == Value(true) &&
ValidateValueProgram(*fixture.program.values, true, &error),
error.empty() ? "folded branch condition did not survive identity removal"
: error.c_str());
}
void TestUndefinedRuntimeValueFails() {
Fixture fixture;
const auto undef = fixture.Emit(ValueOpcode::UndefU32);
@@ -443,6 +484,7 @@ int main() {
TestConstantBufferBounds();
TestReadLaneElimination();
TestOptimizationPipeline();
TestControlFlowValueSurvivesReadLaneFolding();
TestUndefinedRuntimeValueFails();
std::cout << "TypedValuePlanningTests: all cases passed\n";
return 0;