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shader: flush FP32 denormals with a float compare and multiply instead of bit masks

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This commit is contained in:
nmzik
2026-10-21 23:33:42 +02:00
parent da19501889
commit 3a842e1a6b
1 changed files with 8 additions and 16 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterAluHelpers.cpp
+8 -16
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@@ -150,22 +150,14 @@ uint32_t EmitFPMedTri32(EmitterState& state, uint32_t a, uint32_t b, uint32_t c)
}
uint32_t EmitFlushF32DenormToSignedZero(EmitterState& state, uint32_t value) {
const auto bits = state.builder.AllocateId();
const auto abs_bits = state.builder.AllocateId();
const auto sign_bits = state.builder.AllocateId();
const auto subnormal = state.builder.AllocateId();
const auto selected = state.builder.AllocateId();
const auto ret = state.builder.AllocateId();
state.builder.AddFunction(spv::OpBitcast, TypeU32(state), bits, value);
state.builder.AddFunction(spv::OpBitwiseAnd, TypeU32(state), abs_bits, bits,
ConstantU32(state, 0x7fffffffu));
state.builder.AddFunction(spv::OpBitwiseAnd, TypeU32(state), sign_bits, bits,
ConstantU32(state, 0x80000000u));
state.builder.AddFunction(spv::OpULessThan, TypeBool(state), subnormal, abs_bits,
ConstantU32(state, 0x00800000u));
state.builder.AddFunction(spv::OpSelect, TypeU32(state), selected, subnormal, sign_bits, bits);
state.builder.AddFunction(spv::OpBitcast, TypeF32(state), ret, selected);
return ret;
// x * 0 keeps the sign of a denormal; NaN and infinity fail the ordered compare.
const auto magnitude = state.builder.AllocateId();
state.builder.AddFunction(spv::OpExtInst, TypeF32(state), magnitude, GlslStd450(state),
GLSLstd450FAbs, value);
const auto denormal = Binary(state, spv::OpFOrdLessThan, TypeBool(state), magnitude,
ConstantF32(state, 0x00800000u));
return Select(state, TypeF32(state), denormal,
Binary(state, spv::OpFMul, TypeF32(state), value, ConstantF32(state, 0)), value);
}
uint32_t EmitTrigCycleF32(EmitterState& state, uint32_t src, bool preserve_signed_zero) {