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shader: fix shared-terminal selection merges

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This commit is contained in:
nmzik
2026-08-19 16:55:37 +02:00
parent 41bfba515c
commit 2db0b3cfa7
2 changed files with 50 additions and 22 deletions
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tests/shaderCfgTests.cpp
+45
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@@ -7881,6 +7881,50 @@ void TestNewShaderRecompilerCfgNestedEarlyExitSharedTerminal() {
CheckSpirvBinaryValidates(result.spirv);
}
void TestNewShaderRecompilerCfgSharedTerminalEarlyExit() {
const uint32_t shader[] = {
EncodeSopc(0x06, 0, 0), // outer early-exit condition
EncodeSopp(0x04, 8), // outer -> early exit or nested body
EncodeSopc(0x06, 1, 1), // nested body condition
EncodeSopp(0x04, 1), // nested body -> right or left
EncodeSopp(0x02, 4), // left -> body continuation
EncodeSopc(0x06, 2, 2), // right condition
EncodeSopp(0x04, 1), // right -> join or work
EncodeSopp(0x02, 0), // work -> join
EncodeSopp(0x02, 0), // join -> body continuation
EncodeSopp(0x02, 1), // body continuation -> shared terminal
EncodeSopp(0x02, 0), // early exit -> shared terminal
0xbf810000u,
};
ShaderRecompiler::Decoder::Program decoded;
std::string error;
Check(ShaderRecompiler::Decoder::DecodeProgram(std::span{shader}, decoded,
&error),
error.c_str());
ShaderRecompiler::CFG::Graph graph;
Check(ShaderRecompiler::CFG::BuildGraph(decoded, graph, &error),
error.c_str());
const auto original_coverage =
CfgInstructionCoverage(graph, decoded.instructions.size());
Check(ShaderRecompiler::CFG::Structurize(graph, &error), error.c_str());
Check(CfgInstructionCoverage(graph, decoded.instructions.size()) ==
original_coverage,
"shared-terminal structurization changed semantic instruction coverage");
auto options = MakeCompileOptions(ShaderType::Pixel);
options.dump_ir = true;
ShaderRecompiler::CompileResult result;
Check(ShaderRecompiler::TryRecompile(shader, options, result, &error),
error.c_str());
Check(!result.program.dispatcher_fallback &&
Common::ContainsStr(result.ir_dump, "mode=structured"),
"shared-terminal early exit selected dispatcher control flow");
Check(SpirvInstructionOpcodeCount(result.spirv, 251) == 0u,
"shared-terminal early exit unexpectedly used dispatcher OpSwitch");
CheckSpirvBinaryValidates(result.spirv);
}
void TestNewShaderRecompilerCfgPrunesUnreachableSelectionEntry() {
const uint32_t shader[] = {
EncodeSopp(0x02, 1), // entry -> header, skipping unreachable entry
@@ -11513,6 +11557,7 @@ int main() {
TestNewShaderRecompilerCfgLoopSharedRegion();
TestNewShaderRecompilerCfgOverlappingEarlyExitLadder();
TestNewShaderRecompilerCfgNestedEarlyExitSharedTerminal();
TestNewShaderRecompilerCfgSharedTerminalEarlyExit();
TestNewShaderRecompilerCfgPrunesUnreachableSelectionEntry();
TestNewShaderRecompilerCfgIrreducibleDispatcher();
TestNewShaderRecompilerDispatcherSpillsU32x3();