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shader: share one find-first-bit lowering for S_FF0/FF1/FLBIT_I32_B64 and remove FindUMsb64

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nmzik
2026-10-21 22:39:34 +02:00
parent 6e5167598e
commit 4a1440197f
7 changed files with 27 additions and 56 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterAlu.cpp
-24
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@@ -5,18 +5,6 @@
namespace Libs::Graphics::ShaderRecompiler::Spirv::Emitter {
namespace {
struct Pair {
uint32_t low = 0;
uint32_t high = 0;
};
Pair ExtractPair(EmitterState& state, uint32_t value) {
Pair result {state.builder.AllocateId(), state.builder.AllocateId()};
state.builder.AddFunction(spv::OpCompositeExtract, TypeU32(state), result.low, value, 0);
state.builder.AddFunction(spv::OpCompositeExtract, TypeU32(state), result.high, value, 1);
return result;
}
uint32_t EmitMinMaxF64(EmitterState& state, uint32_t lhs, uint32_t rhs, bool max_value) {
const auto bits_type = TypeU32Vector(state, 2);
const auto lhs_bits = Unary(state, spv::OpBitcast, bits_type, lhs);
@@ -160,18 +148,6 @@ uint32_t EmitFPMad32(EmitterState& state, uint32_t a, uint32_t b, uint32_t c) {
return sum;
}
uint32_t EmitFindUMsb64(EmitterState& state, uint32_t value) {
// GLSL FindUMsb is restricted to 32-bit components.
const auto unpacked = Unary(state, spv::OpBitcast, TypeU32Vector(state, 2), value);
const auto pair =
ExtractPair(state, EmitExt(state, TypeU32Vector(state, 2), GLSLstd450FindUMsb, {unpacked}));
const auto high_found =
Binary(state, spv::OpINotEqual, TypeBool(state), pair.high, ConstantU32(state, UINT32_MAX));
return Select(state, TypeU32(state), high_found,
Binary(state, spv::OpIAdd, TypeU32(state), pair.high, ConstantU32(state, 32)),
pair.low);
}
uint32_t EmitConvertU16U32(EmitterState& state, uint32_t arg0) {
return EmitNative<spv::OpBitwiseAnd, IR::Type::U16>(state, arg0, ConstantU32(state, 0xffffu));
}