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[DirectX][ObectYAML] Make RootParameterOffset and StaticSamplersOffset behaviour consistent #155521

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Merged
merged 12 commits into from
Aug 27, 2025
Merged

[DirectX][ObectYAML] Make RootParameterOffset and StaticSamplersOffset behaviour consistent #155521

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7bfa043
always compute the staticsampleroffset in code generation
inbelic Aug 26, 2025
77fb338
make offset parameters optional and enforce their values
inbelic Aug 26, 2025
82647c3
correct offsets in codegen tests
inbelic Aug 26, 2025
7f92378
correct offsets in obj2yaml round trip tests
inbelic Aug 26, 2025
c1e71aa
correct offsets in tools tests
inbelic Aug 26, 2025
6802d7b
correct offset values in unit tests
inbelic Aug 26, 2025
b2d4b85
add testing of error messages
inbelic Aug 26, 2025
915abb1
add testing of computed offsets
inbelic Aug 26, 2025
b913992
add testing of optionally specified parameters
inbelic Aug 26, 2025
b66c864
review: move offset computation to RootSignatureDesc in common place
inbelic Aug 27, 2025
8ff2d0a
review: nit
inbelic Aug 27, 2025
3736a63
review: assert computed offset matches written offset
inbelic Aug 27, 2025
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2 changes: 2 additions & 0 deletions llvm/include/llvm/MC/DXContainerRootSignature.h
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Original file line number Diff line number Diff line change
Expand Up @@ -110,6 +110,8 @@ struct RootSignatureDesc {
LLVM_ABI void write(raw_ostream &OS) const;

LLVM_ABI size_t getSize() const;
LLVM_ABI uint32_t computeRootParametersOffset() const;
LLVM_ABI uint32_t computeStaticSamplersOffset() const;
};
} // namespace mcdxbc
} // namespace llvm
Expand Down
4 changes: 2 additions & 2 deletions llvm/include/llvm/ObjectYAML/DXContainerYAML.h
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Original file line number Diff line number Diff line change
Expand Up @@ -187,9 +187,9 @@ struct RootSignatureYamlDesc {

uint32_t Version;
uint32_t NumRootParameters;
uint32_t RootParametersOffset;
std::optional<uint32_t> RootParametersOffset;
uint32_t NumStaticSamplers;
uint32_t StaticSamplersOffset;
std::optional<uint32_t> StaticSamplersOffset;

RootParameterYamlDesc Parameters;
SmallVector<StaticSamplerYamlDesc> StaticSamplers;
Expand Down
69 changes: 37 additions & 32 deletions llvm/lib/MC/DXContainerRootSignature.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -29,23 +29,33 @@ static void rewriteOffsetToCurrentByte(raw_svector_ostream &Stream,
}

size_t RootSignatureDesc::getSize() const {
size_t Size =
sizeof(dxbc::RTS0::v1::RootSignatureHeader) +
ParametersContainer.size() * sizeof(dxbc::RTS0::v1::RootParameterHeader) +
uint32_t StaticSamplersOffset = computeStaticSamplersOffset();
size_t StaticSamplersSize =
StaticSamplers.size() * sizeof(dxbc::RTS0::v1::StaticSampler);

return size_t(StaticSamplersOffset) + StaticSamplersSize;
}

uint32_t RootSignatureDesc::computeRootParametersOffset() const {
return sizeof(dxbc::RTS0::v1::RootSignatureHeader);
}

uint32_t RootSignatureDesc::computeStaticSamplersOffset() const {
uint32_t Offset = computeRootParametersOffset();

for (const RootParameterInfo &I : ParametersContainer) {
Offset += sizeof(dxbc::RTS0::v1::RootParameterHeader);
switch (I.Type) {
case dxbc::RootParameterType::Constants32Bit:
Size += sizeof(dxbc::RTS0::v1::RootConstants);
Offset += sizeof(dxbc::RTS0::v1::RootConstants);
break;
case dxbc::RootParameterType::CBV:
case dxbc::RootParameterType::SRV:
case dxbc::RootParameterType::UAV:
if (Version == 1)
Size += sizeof(dxbc::RTS0::v1::RootDescriptor);
Offset += sizeof(dxbc::RTS0::v1::RootDescriptor);
else
Size += sizeof(dxbc::RTS0::v2::RootDescriptor);
Offset += sizeof(dxbc::RTS0::v2::RootDescriptor);

break;
case dxbc::RootParameterType::DescriptorTable:
Expand All @@ -54,15 +64,16 @@ size_t RootSignatureDesc::getSize() const {

// 4 bytes for the number of ranges in table and
// 4 bytes for the ranges offset
Size += 2 * sizeof(uint32_t);
Offset += 2 * sizeof(uint32_t);
if (Version == 1)
Size += sizeof(dxbc::RTS0::v1::DescriptorRange) * Table.Ranges.size();
Offset += sizeof(dxbc::RTS0::v1::DescriptorRange) * Table.Ranges.size();
else
Size += sizeof(dxbc::RTS0::v2::DescriptorRange) * Table.Ranges.size();
Offset += sizeof(dxbc::RTS0::v2::DescriptorRange) * Table.Ranges.size();
break;
}
}
return Size;

return Offset;
}

void RootSignatureDesc::write(raw_ostream &OS) const {
Expand All @@ -76,11 +87,7 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
support::endian::write(BOS, NumParameters, llvm::endianness::little);
support::endian::write(BOS, RootParameterOffset, llvm::endianness::little);
support::endian::write(BOS, NumSamplers, llvm::endianness::little);
uint32_t SSO = StaticSamplersOffset;
if (NumSamplers > 0)
SSO = writePlaceholder(BOS);
else
support::endian::write(BOS, SSO, llvm::endianness::little);
uint32_t SSO = writePlaceholder(BOS);
support::endian::write(BOS, Flags, llvm::endianness::little);

SmallVector<uint32_t> ParamsOffsets;
Expand Down Expand Up @@ -144,23 +151,21 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
}
}
}
if (NumSamplers > 0) {
rewriteOffsetToCurrentByte(BOS, SSO);
for (const auto &S : StaticSamplers) {
support::endian::write(BOS, S.Filter, llvm::endianness::little);
support::endian::write(BOS, S.AddressU, llvm::endianness::little);
support::endian::write(BOS, S.AddressV, llvm::endianness::little);
support::endian::write(BOS, S.AddressW, llvm::endianness::little);
support::endian::write(BOS, S.MipLODBias, llvm::endianness::little);
support::endian::write(BOS, S.MaxAnisotropy, llvm::endianness::little);
support::endian::write(BOS, S.ComparisonFunc, llvm::endianness::little);
support::endian::write(BOS, S.BorderColor, llvm::endianness::little);
support::endian::write(BOS, S.MinLOD, llvm::endianness::little);
support::endian::write(BOS, S.MaxLOD, llvm::endianness::little);
support::endian::write(BOS, S.ShaderRegister, llvm::endianness::little);
support::endian::write(BOS, S.RegisterSpace, llvm::endianness::little);
support::endian::write(BOS, S.ShaderVisibility, llvm::endianness::little);
}
rewriteOffsetToCurrentByte(BOS, SSO);
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I think adding some asserts like the one below, in the places we are manually calculating sizes and offset to be beneficial. The one in line 170 helped detect many bugs during development.

This would require making rewriteOffsetToCurrentByte return the new offset, but that should be a straight forward change.

Suggested change
rewriteOffsetToCurrentByte(BOS, SSO);
uint32_t SSORealOffset = rewriteOffsetToCurrentByte(BOS, SSO);
assert(computeStaticSamplersOffset() == SSORealOffset);

for (const auto &S : StaticSamplers) {
support::endian::write(BOS, S.Filter, llvm::endianness::little);
support::endian::write(BOS, S.AddressU, llvm::endianness::little);
support::endian::write(BOS, S.AddressV, llvm::endianness::little);
support::endian::write(BOS, S.AddressW, llvm::endianness::little);
support::endian::write(BOS, S.MipLODBias, llvm::endianness::little);
support::endian::write(BOS, S.MaxAnisotropy, llvm::endianness::little);
support::endian::write(BOS, S.ComparisonFunc, llvm::endianness::little);
support::endian::write(BOS, S.BorderColor, llvm::endianness::little);
support::endian::write(BOS, S.MinLOD, llvm::endianness::little);
support::endian::write(BOS, S.MaxLOD, llvm::endianness::little);
support::endian::write(BOS, S.ShaderRegister, llvm::endianness::little);
support::endian::write(BOS, S.RegisterSpace, llvm::endianness::little);
support::endian::write(BOS, S.ShaderVisibility, llvm::endianness::little);
}
assert(Storage.size() == getSize());
OS.write(Storage.data(), Storage.size());
Expand Down
35 changes: 29 additions & 6 deletions llvm/lib/ObjectYAML/DXContainerEmitter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ class DXContainerWriter {
Error validateSize(uint32_t Computed);

void writeHeader(raw_ostream &OS);
void writeParts(raw_ostream &OS);
Error writeParts(raw_ostream &OS);
};
} // namespace

Expand Down Expand Up @@ -107,7 +107,7 @@ void DXContainerWriter::writeHeader(raw_ostream &OS) {
Offsets.size() * sizeof(uint32_t));
}

void DXContainerWriter::writeParts(raw_ostream &OS) {
Error DXContainerWriter::writeParts(raw_ostream &OS) {
uint32_t RollingOffset =
sizeof(dxbc::Header) + (ObjectFile.Header.PartCount * sizeof(uint32_t));
for (auto I : llvm::zip(ObjectFile.Parts, *ObjectFile.Header.PartOffsets)) {
Expand Down Expand Up @@ -269,9 +269,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
mcdxbc::RootSignatureDesc RS;
RS.Flags = P.RootSignature->getEncodedFlags();
RS.Version = P.RootSignature->Version;
RS.RootParameterOffset = P.RootSignature->RootParametersOffset;
RS.NumStaticSamplers = P.RootSignature->NumStaticSamplers;
RS.StaticSamplersOffset = P.RootSignature->StaticSamplersOffset;

for (DXContainerYAML::RootParameterLocationYaml &L :
P.RootSignature->Parameters.Locations) {
Expand Down Expand Up @@ -307,6 +305,7 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
Descriptor.ShaderRegister = DescriptorYaml.ShaderRegister;
if (RS.Version > 1)
Descriptor.Flags = DescriptorYaml.getEncodedFlags();

RS.ParametersContainer.addParameter(Type, Visibility, Descriptor);
break;
}
Expand All @@ -323,8 +322,10 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
Range.RegisterSpace = R.RegisterSpace;
Range.OffsetInDescriptorsFromTableStart =
R.OffsetInDescriptorsFromTableStart;

if (RS.Version > 1)
Range.Flags = R.getEncodedFlags();

Table.Ranges.push_back(Range);
}
RS.ParametersContainer.addParameter(Type, Visibility, Table);
Expand Down Expand Up @@ -352,6 +353,27 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
RS.StaticSamplers.push_back(NewSampler);
}

// Handling of offsets
RS.RootParameterOffset = RS.computeRootParametersOffset();
if (P.RootSignature->RootParametersOffset &&
P.RootSignature->RootParametersOffset.value() !=
RS.RootParameterOffset) {
return createStringError(
errc::invalid_argument,
"Specified RootParametersOffset does not match required value: %d.",
RS.RootParameterOffset);
}

RS.StaticSamplersOffset = RS.computeStaticSamplersOffset();
if (P.RootSignature->StaticSamplersOffset &&
P.RootSignature->StaticSamplersOffset.value() !=
RS.StaticSamplersOffset) {
return createStringError(
errc::invalid_argument,
"Specified StaticSamplersOffset does not match computed value: %d.",
RS.StaticSamplersOffset);
}

RS.write(OS);
break;
}
Expand All @@ -361,14 +383,15 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
OS.write_zeros(PartSize - BytesWritten);
RollingOffset += PartSize;
}

return Error::success();
}

Error DXContainerWriter::write(raw_ostream &OS) {
if (Error Err = computePartOffsets())
return Err;
writeHeader(OS);
writeParts(OS);
return Error::success();
return writeParts(OS);
}

namespace llvm {
Expand Down
4 changes: 2 additions & 2 deletions llvm/lib/ObjectYAML/DXContainerYAML.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -376,9 +376,9 @@ void MappingTraits<DXContainerYAML::RootSignatureYamlDesc>::mapping(
IO &IO, DXContainerYAML::RootSignatureYamlDesc &S) {
IO.mapRequired("Version", S.Version);
IO.mapRequired("NumRootParameters", S.NumRootParameters);
IO.mapRequired("RootParametersOffset", S.RootParametersOffset);
IO.mapOptional("RootParametersOffset", S.RootParametersOffset, std::nullopt);
IO.mapRequired("NumStaticSamplers", S.NumStaticSamplers);
IO.mapRequired("StaticSamplersOffset", S.StaticSamplersOffset);
IO.mapOptional("StaticSamplersOffset", S.StaticSamplersOffset, std::nullopt);
IO.mapRequired("Parameters", S.Parameters.Locations, S);
IO.mapOptional("Samplers", S.StaticSamplers);
#define ROOT_SIGNATURE_FLAG(Num, Val) IO.mapOptional(#Val, S.Val, false);
Expand Down
2 changes: 1 addition & 1 deletion ...t/CodeGen/DirectX/ContainerData/RootSignature-DescriptorTable-AllValidFlagCombinations.ll
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Expand Up @@ -59,7 +59,7 @@ attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
;DXC-NEXT: NumRootParameters: 1
;DXC-NEXT: RootParametersOffset: 24
;DXC-NEXT: NumStaticSamplers: 0
;DXC-NEXT: StaticSamplersOffset: 0
;DXC-NEXT: StaticSamplersOffset: 380
;DXC-NEXT: Parameters:
;DXC-NEXT: - ParameterType: 0
;DXC-NEXT: ShaderVisibility: 0
Expand Down
2 changes: 1 addition & 1 deletion ...CodeGen/DirectX/ContainerData/RootSignature-DescriptorTable-AllValidFlagCombinationsV1.ll
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Expand Up @@ -24,7 +24,7 @@ attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
; DXC-NEXT: NumRootParameters: 1
; DXC-NEXT: RootParametersOffset: 24
; DXC-NEXT: NumStaticSamplers: 0
; DXC-NEXT: StaticSamplersOffset: 0
; DXC-NEXT: StaticSamplersOffset: 84
; DXC-NEXT: Parameters:
; DXC-NEXT: - ParameterType: 0
; DXC-NEXT: ShaderVisibility: 0
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/CodeGen/DirectX/ContainerData/RootSignature-DescriptorTable.ll
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Expand Up @@ -26,7 +26,7 @@ attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
; DXC-NEXT: NumRootParameters: 1
; DXC-NEXT: RootParametersOffset: 24
; DXC-NEXT: NumStaticSamplers: 0
; DXC-NEXT: StaticSamplersOffset: 0
; DXC-NEXT: StaticSamplersOffset: 92
; DXC-NEXT: Parameters:
; DXC-NEXT: - ParameterType: 0
; DXC-NEXT: ShaderVisibility: 0
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/CodeGen/DirectX/ContainerData/RootSignature-Flags.ll
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Expand Up @@ -25,6 +25,6 @@ attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
; DXC-NEXT: NumRootParameters: 0
; DXC-NEXT: RootParametersOffset: 24
; DXC-NEXT: NumStaticSamplers: 0
; DXC-NEXT: StaticSamplersOffset: 0
; DXC-NEXT: StaticSamplersOffset: 24
; DXC-NEXT: Parameters: []
; DXC-NEXT: AllowInputAssemblerInputLayout: true
2 changes: 1 addition & 1 deletion llvm/test/CodeGen/DirectX/ContainerData/RootSignature-RootConstants.ll
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Expand Up @@ -24,7 +24,7 @@ attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
; DXC-NEXT: NumRootParameters: 1
; DXC-NEXT: RootParametersOffset: 24
; DXC-NEXT: NumStaticSamplers: 0
; DXC-NEXT: StaticSamplersOffset: 0
; DXC-NEXT: StaticSamplersOffset: 48
; DXC-NEXT: Parameters:
; DXC-NEXT: - ParameterType: 1
; DXC-NEXT: ShaderVisibility: 0
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/CodeGen/DirectX/ContainerData/RootSignature-RootDescriptor.ll
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Expand Up @@ -24,7 +24,7 @@ attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
; DXC-NEXT: NumRootParameters: 1
; DXC-NEXT: RootParametersOffset: 24
; DXC-NEXT: NumStaticSamplers: 0
; DXC-NEXT: StaticSamplersOffset: 0
; DXC-NEXT: StaticSamplersOffset: 48
; DXC-NEXT: Parameters:
; DXC-NEXT: - ParameterType: 2
; DXC-NEXT: ShaderVisibility: 0
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/CodeGen/DirectX/ContainerData/RootSignature-RootDescriptor_V1.ll
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Expand Up @@ -24,7 +24,7 @@ attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
; DXC-NEXT: NumRootParameters: 1
; DXC-NEXT: RootParametersOffset: 24
; DXC-NEXT: NumStaticSamplers: 0
; DXC-NEXT: StaticSamplersOffset: 0
; DXC-NEXT: StaticSamplersOffset: 44
; DXC-NEXT: Parameters:
; DXC-NEXT: - ParameterType: 2
; DXC-NEXT: ShaderVisibility: 0
Expand Down
4 changes: 2 additions & 2 deletions llvm/test/ObjectYAML/DXContainer/RootSignature-Descriptor1.0.yaml
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Expand Up @@ -17,7 +17,7 @@ Parts:
NumRootParameters: 1
RootParametersOffset: 24
NumStaticSamplers: 0
StaticSamplersOffset: 60
StaticSamplersOffset: 44
Parameters:
- ParameterType: 2 # SRV
ShaderVisibility: 3 # Domain
Expand All @@ -34,7 +34,7 @@ Parts:
# CHECK-NEXT: NumRootParameters: 1
# CHECK-NEXT: RootParametersOffset: 24
# CHECK-NEXT: NumStaticSamplers: 0
# CHECK-NEXT: StaticSamplersOffset: 60
# CHECK-NEXT: StaticSamplersOffset: 44
# CHECK-NEXT: Parameters:
# CHECK-NEXT: - ParameterType: 2
# CHECK-NEXT: ShaderVisibility: 3
Expand Down
4 changes: 2 additions & 2 deletions llvm/test/ObjectYAML/DXContainer/RootSignature-Descriptor1.1.yaml
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Expand Up @@ -17,7 +17,7 @@ Parts:
NumRootParameters: 1
RootParametersOffset: 24
NumStaticSamplers: 0
StaticSamplersOffset: 60
StaticSamplersOffset: 48
Parameters:
- ParameterType: 2 # SRV
ShaderVisibility: 3 # Domain
Expand All @@ -35,7 +35,7 @@ Parts:
# CHECK-NEXT: NumRootParameters: 1
# CHECK-NEXT: RootParametersOffset: 24
# CHECK-NEXT: NumStaticSamplers: 0
# CHECK-NEXT: StaticSamplersOffset: 60
# CHECK-NEXT: StaticSamplersOffset: 48
# CHECK-NEXT: Parameters:
# CHECK-NEXT: - ParameterType: 2
# CHECK-NEXT: ShaderVisibility: 3
Expand Down
4 changes: 2 additions & 2 deletions llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.0.yaml
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Expand Up @@ -18,7 +18,7 @@ Parts:
NumRootParameters: 1
RootParametersOffset: 24
NumStaticSamplers: 0
StaticSamplersOffset: 60
StaticSamplersOffset: 64
Parameters:
- ParameterType: 0 # SRV
ShaderVisibility: 3 # Domain
Expand All @@ -40,7 +40,7 @@ Parts:
# CHECK-NEXT: NumRootParameters: 1
# CHECK-NEXT: RootParametersOffset: 24
# CHECK-NEXT: NumStaticSamplers: 0
# CHECK-NEXT: StaticSamplersOffset: 60
# CHECK-NEXT: StaticSamplersOffset: 64
# CHECK-NEXT: Parameters:
# CHECK-NEXT: - ParameterType: 0
# CHECK-NEXT: ShaderVisibility: 3
Expand Down
4 changes: 2 additions & 2 deletions llvm/test/ObjectYAML/DXContainer/RootSignature-DescriptorTable1.1.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ Parts:
NumRootParameters: 1
RootParametersOffset: 24
NumStaticSamplers: 0
StaticSamplersOffset: 60
StaticSamplersOffset: 68
Parameters:
- ParameterType: 0 # SRV
ShaderVisibility: 3 # Domain
Expand All @@ -41,7 +41,7 @@ Parts:
# CHECK-NEXT: NumRootParameters: 1
# CHECK-NEXT: RootParametersOffset: 24
# CHECK-NEXT: NumStaticSamplers: 0
# CHECK-NEXT: StaticSamplersOffset: 60
# CHECK-NEXT: StaticSamplersOffset: 68
# CHECK-NEXT: Parameters:
# CHECK-NEXT: - ParameterType: 0
# CHECK-NEXT: ShaderVisibility: 3
Expand Down
4 changes: 2 additions & 2 deletions llvm/test/ObjectYAML/DXContainer/RootSignature-Flags.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ Parts:
NumRootParameters: 0
RootParametersOffset: 24
NumStaticSamplers: 0
StaticSamplersOffset: 60
StaticSamplersOffset: 24
Parameters: []
AllowInputAssemblerInputLayout: true
DenyGeometryShaderRootAccess: true
Expand All @@ -29,7 +29,7 @@ Parts:
# CHECK-NEXT: NumRootParameters: 0
# CHECK-NEXT: RootParametersOffset: 24
# CHECK-NEXT: NumStaticSamplers: 0
# CHECK-NEXT: StaticSamplersOffset: 60
# CHECK-NEXT: StaticSamplersOffset: 24
# CHECK-NEXT: Parameters: []
# CHECK-NEXT: AllowInputAssemblerInputLayout: true
# CHECK-NEXT: DenyGeometryShaderRootAccess: true
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