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[SPIRV] Preserve NaN, Inf, and signed zeros w/ -Gis #7693

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Aug 18, 2025
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[SPIRV] Preserve NaN, Inf, and signed zeros w/ -Gis #7693

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[SPIRV] Preserve NaN, Inf, and signed zeros w/ -Gis
llvm-beanz Aug 12, 2025
b0d2e8b
Update based on feedback from @keenuts
llvm-beanz Aug 13, 2025
f33ccd3
Apply suggestions from code review
llvm-beanz Aug 13, 2025
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13 changes: 13 additions & 0 deletions tools/clang/lib/SPIRV/SpirvEmitter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -862,6 +862,19 @@ void SpirvEmitter::HandleTranslationUnit(ASTContext &context) {
SourceLocation());
}

// For Vulkan 1.2 and later, add SignedZeroInfNanPreserve when -Gis is
// provided to preserve NaN/Inf and signed zeros.
if (spirvOptions.IEEEStrict) {
if (featureManager.getSpirvVersion(featureManager.getTargetEnv()) <
VersionTuple(1, 2))
spvBuilder.requireExtension("SPV_KHR_float_controls", SourceLocation());
spvBuilder.addExecutionMode(entryFunction,
spv::ExecutionMode::SignedZeroInfNanPreserve,
{32}, SourceLocation());
spvBuilder.requireCapability(spv::Capability::SignedZeroInfNanPreserve,
SourceLocation());
}

llvm::StringRef denormMode = spirvOptions.floatDenormalMode;
if (!denormMode.empty()) {
if (denormMode.equals_lower("preserve")) {
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10 changes: 10 additions & 0 deletions tools/clang/test/CodeGenSPIRV/SignedZeroInfNanPreserve.hlsl
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@@ -0,0 +1,10 @@
// RUN: %dxc -T cs_6_0 -spirv -Gis %s| FileCheck %s --check-prefixes=CHECK,PRE_1_2
// RUN: %dxc -T cs_6_0 -spirv -Gis -fspv-target-env=vulkan1.2 %s| FileCheck %s

// CHECK: OpCapability SignedZeroInfNanPreserve
// PRE_1_2: OpExtension "SPV_KHR_float_controls"
// CHECK: OpEntryPoint
// CHECK: OpExecutionMode %main SignedZeroInfNanPreserve 32

[numthreads(8,1,1)]
void main() {}