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graphics: implement RDNA2 64-bit first-set-bit

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This commit is contained in:
nmzik
2026-08-15 09:51:57 +02:00
parent 0ffacf22e6
commit 28a913894d
8 changed files with 58 additions and 23 deletions
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src/graphics/shader/recompiler/frontend/translate/Integer.cpp
+10
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@@ -320,6 +320,16 @@ bool Translator::TranslateComposedInteger(const IR::Instruction& inst) {
result = ir.BitwiseXor(ir.BitwiseXor(ReadU32(inst.src[0]), ReadU32(inst.src[1])),
ReadU32(inst.src[2]));
break;
case IR::Opcode::FindLsbU64: {
const auto source = UnpackU64(ReadU64(inst.src[0]));
const auto low_lsb = IR::U32(ir.Emit(IR::ValueOpcode::FindILsb32, {source[0]}));
const auto high_lsb = IR::U32(ir.Emit(IR::ValueOpcode::FindILsb32, {source[1]}));
const auto high_position = ir.IAdd(high_lsb, IR::U32(IR::Value(32u)));
result = ir.Select(ir.INotEqual(source[0], IR::U32(IR::Value(0u))), low_lsb,
ir.Select(ir.INotEqual(source[1], IR::U32(IR::Value(0u))),
high_position, IR::U32(IR::Value(0xffffffffu))));
break;
}
case IR::Opcode::FindMsbFromHighU32: {
const auto source = ReadU32(inst.src[0]);
const auto msb = IR::U32(ir.Emit(IR::ValueOpcode::FindUMsb32, {source}));