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Share repeated SSA bitcasts and guard emitted shader size

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nmzik
2026-10-19 00:43:10 +02:00
parent bb505a3ae8
commit 75d7a4311d
3 changed files with 84 additions and 3 deletions
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src/graphics/shader/recompiler/ir/passes/ConstantPropagation.cpp
+13
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@@ -1029,6 +1029,19 @@ void ConstantPropagationPass(const BlockList& blocks, uint32_t wave_size) {
}
drain();
} while (normalized);
// Repeated register reads share a bitcast only within the same SSA block.
std::unordered_map<const Inst*, Inst*> bitcasts;
for (auto* block: blocks) {
bitcasts.clear();
for (auto& inst: *block) {
if (inst.GetOpcode() != ValueOpcode::BitCastF32U32 &&
inst.GetOpcode() != ValueOpcode::BitCastU32F32) continue;
const auto* source = Arg(inst, 0).TryInstruction();
if (source == nullptr) continue;
const auto [entry, inserted] = bitcasts.try_emplace(source, &inst);
if (!inserted) Replace(inst, Value(entry->second));
}
}
}
} // namespace Libs::Graphics::ShaderRecompiler::IR