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Shader: execute RDNA2 FP64 shadow arithmetic and log denorm limits

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Shader: disable FP64 denorm preservation controls for now
This commit is contained in:
nmzik
2026-09-26 14:46:41 +04:00
parent cf268af839
commit 16b83a034c
19 changed files with 307 additions and 9 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterModule.cpp
+17
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@@ -47,6 +47,10 @@ uint32_t TypeF32(EmitterState& state) {
return state.builder.Type(spv::OpTypeFloat, 32);
}
uint32_t TypeF64(EmitterState& state) {
return state.builder.Type(spv::OpTypeFloat, 64);
}
uint32_t TypeU32Vector(EmitterState& state, uint32_t components) {
return state.builder.Type(spv::OpTypeVector, TypeU32(state), components);
}
@@ -679,6 +683,19 @@ void DefineModule(EmitterState& state) {
// contract prevents host compilers from treating synthesized IEEE values as finite.
state.builder.AddExecutionMode(state.main_func, spv::ExecutionModeSignedZeroInfNanPreserve,
32u);
if (state.requirements.float64) {
EXIT_NOT_IMPLEMENTED(state.program.stage != ShaderType::Compute);
EXIT_NOT_IMPLEMENTED(state.input_info.compute->float_mode != 0xc0);
// MODE=0xc0 uses round-to-nearest-even and preserves FP64 input/output denormals.
state.builder.RequireCapability(spv::CapabilityFloat64);
state.builder.RequireCapability(spv::CapabilityRoundingModeRTE);
state.builder.AddExecutionMode(state.main_func, spv::ExecutionModeSignedZeroInfNanPreserve,
64u);
// FP64 denormal preservation is temporarily disabled.
// state.builder.RequireCapability(spv::CapabilityDenormPreserve);
// state.builder.AddExecutionMode(state.main_func, spv::ExecutionModeDenormPreserve, 64u);
state.builder.AddExecutionMode(state.main_func, spv::ExecutionModeRoundingModeRTE, 32u);
}
if (const auto* cs = ShaderWorkgroupInput(state.program.stage, state.input_info)) {
uint32_t local_x = state.requirements.compute_derivatives ? 2u : 1u;
uint32_t local_y = state.requirements.compute_derivatives ? 2u : 1u;