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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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12 changes: 12 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 +862,18 @@ 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 &&
featureManager.getSpirvVersion(featureManager.getTargetEnv()) >=
VersionTuple(1, 2)) {
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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11 changes: 11 additions & 0 deletions tools/clang/test/CodeGenSPIRV/SignedZeroInfNanPreserve.hlsl
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@@ -0,0 +1,11 @@
// RUN: %dxc -T cs_6_0 -spirv -Gis %s| FileCheck %s --check-prefixes=CHECK,OLD
// RUN: %dxc -T cs_6_0 -spirv -Gis -fspv-target-env=vulkan1.2 %s| FileCheck %s --check-prefixes=CHECK,NEW

// OLD-NOT: OpCapability SignedZeroInfNanPreserve
// NEW: OpCapability SignedZeroInfNanPreserve
// CHECK: OpEntryPoint
// OLD-NOT: OpExecutionMode %main SignedZeroInfNanPreserve 32
// NEW: OpExecutionMode %main SignedZeroInfNanPreserve 32

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