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shader: link scalar leaf calls only for SWAPPC programs

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Co-authored-by: Behzad <behzadkhan1736@gmail.com>
This commit is contained in:
nmzik
2026-10-09 16:09:36 +02:00
parent 165cd884ca
commit 1818aae562
14 changed files with 663 additions and 86 deletions
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src/graphics/shader/recompiler/frontend/cfg/ShaderCFG.cpp
+36 -2
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@@ -1468,7 +1468,8 @@ Graph BuildGraph(const Decoder::Program& program) {
for (uint32_t i = 0; i < program.instructions.size(); i++) {
const auto& inst = program.instructions[i];
const auto next_pc = InstructionEndPc(inst);
if (Decoder::IsDirectBranch(inst.opcode)) {
if (Decoder::IsDirectBranch(inst.opcode) ||
(inst.opcode == Opcode::S_SWAPPC_B64 && inst.branch_target != UINT32_MAX)) {
if (!IsValidTarget(inst.branch_target, program.instructions, end_pc)) {
ExitBuildFailure(graph, FailureKind::InvalidBranchTarget, UINT32_MAX,
fmt::format("branch at pc 0x{:08x} targets invalid pc 0x{:08x}",
@@ -1501,7 +1502,7 @@ Graph BuildGraph(const Decoder::Program& program) {
if (next_pc <= end_pc) {
labels.push_back(next_pc);
}
} else if (inst.opcode == Opcode::S_ENDPGM) {
} else if (inst.opcode == Opcode::S_ENDPGM || inst.opcode == Opcode::S_SWAPPC_B64) {
labels.push_back(next_pc);
}
}
@@ -1550,6 +1551,9 @@ Graph BuildGraph(const Decoder::Program& program) {
const auto next_pc = InstructionEndPc(last);
if (last.opcode == Opcode::S_ENDPGM) {
block.terminator.kind = TerminatorKind::Return;
} else if (last.opcode == Opcode::S_SWAPPC_B64 && last.branch_target != UINT32_MAX) {
block.terminator.kind = TerminatorKind::Branch;
block.terminator.true_block = block_at_pc(last.branch_target);
} else if (last.opcode == Opcode::S_SETPC_B64) {
const auto& target_info = setpc_targets.at(last.pc);
if (target_info.indirect) {
@@ -1676,6 +1680,36 @@ Graph Structurize(const Graph& graph) {
return GotoStructurizer(graph).Run();
}
bool MayWriteScalarRegister(const Decoder::Instruction& inst, uint32_t code) {
uint32_t destination = UINT32_MAX;
// Scalar ALU pair widths are not all decoded. The typed producer must confirm this word.
return InstructionWritesScalarCode(inst, code) ||
(ScalarOperandCode(inst.dst, destination) && code == destination + 1u);
}
uint32_t FindScalarDefinition(const Decoder::Program& program, const Graph& graph,
uint32_t before, uint32_t code) {
EXIT_IF(before >= program.instructions.size());
const auto found = std::ranges::find_if(graph.blocks, [before](const auto& block) {
return block.inst_begin <= before && before < block.inst_end;
});
EXIT_IF(found == graph.blocks.end());
const auto* block = &*found;
for (size_t depth = 0; depth < graph.blocks.size(); ++depth) {
for (uint32_t i = before; i > block->inst_begin;) {
const auto& inst = program.instructions[--i];
EXIT_IF(inst.opcode == Opcode::S_SWAPPC_B64);
if (MayWriteScalarRegister(inst, code)) return i;
}
if (block->id == graph.entry_block) return UINT32_MAX;
EXIT_IF(block->predecessors.size() != 1u);
block = graph.FindBlock(block->predecessors[0]);
EXIT_IF(block == nullptr);
before = block->inst_end;
}
EXIT("scalar shader call source has cyclic reaching definitions");
}
std::string BranchConditionToString(BranchCondition condition) {
switch (condition) {
case BranchCondition::Always: return "always";