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shader: disable explicit MAD denormal checks for performance testing

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Comment out the five explicit flush checks and record the substantial 3DMiniGolf menu FPS drop on NVIDIA RTX 5080 Laptop GPU. Preserve separate multiply/add rounding and both NoContraction decorations.

The matched runs used silent logging, no debugger, no Vulkan validation, and the cd9fc6ff revert on both revisions. Native denormal behavior remains GPU-dependent.
This commit is contained in:
nmzik
2026-10-05 18:28:36 +04:00
parent 266c12cec6
commit 77d7722173
1 changed files with 9 additions and 6 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterAlu.cpp
+9 -6
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@@ -231,15 +231,18 @@ uint32_t EmitFPFma32(EmitterState& state, uint32_t a, uint32_t b, uint32_t c) {
}
uint32_t EmitFPMad32(EmitterState& state, uint32_t a, uint32_t b, uint32_t c) {
// Legacy MAD/MAC round and flush between multiply and add, irrespective of SP_DENORM.
a = EmitFlushF32DenormToSignedZero(state, a);
b = EmitFlushF32DenormToSignedZero(state, b);
c = EmitFlushF32DenormToSignedZero(state, c);
// Explicit denormal checks typically drop 3DMiniGolf menu FPS from 28-29 to 21-24
// on NVIDIA RTX 5080 Laptop GPU, so leave them disabled for this experiment.
// a = EmitFlushF32DenormToSignedZero(state, a);
// b = EmitFlushF32DenormToSignedZero(state, b);
// c = EmitFlushF32DenormToSignedZero(state, c);
const auto product = EmitFPMul32(state, a, b);
state.builder.AddAnnotation(spv::OpDecorate, product, spv::DecorationNoContraction);
const auto sum = EmitFPAdd32(state, EmitFlushF32DenormToSignedZero(state, product), c);
// const auto sum = EmitFPAdd32(state, EmitFlushF32DenormToSignedZero(state, product), c);
const auto sum = EmitFPAdd32(state, product, c);
state.builder.AddAnnotation(spv::OpDecorate, sum, spv::DecorationNoContraction);
return EmitFlushF32DenormToSignedZero(state, sum);
// return EmitFlushF32DenormToSignedZero(state, sum);
return sum;
}
uint32_t EmitFPMedTri32(EmitterState& state, uint32_t a, uint32_t b, uint32_t c) {