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[HLSL] Refactor Offset calculation while writing Root Signatures. #128577

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Merged
merged 12 commits into from
Feb 26, 2025
Merged

[HLSL] Refactor Offset calculation while writing Root Signatures. #128577

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767b7d0
first working version
Feb 22, 2025
d391727
moving the offset logic to it's own class
Feb 24, 2025
68c7513
refactoring to remove use of map and string
Feb 24, 2025
23069ab
addressing comments
Feb 25, 2025
d14471b
using buffer_ostream
Feb 25, 2025
216341c
remove getsize
Feb 25, 2025
85f012c
clean up
Feb 25, 2025
1e2bcf5
clean up
Feb 25, 2025
0e277d9
clean up
Feb 25, 2025
5cd0044
clean up
Feb 25, 2025
7a7c34d
addressing pr comments
Feb 25, 2025
d3fafab
clean up
Feb 25, 2025
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65 changes: 40 additions & 25 deletions llvm/lib/MC/DXContainerRootSignature.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12,44 +12,59 @@
using namespace llvm;
using namespace llvm::mcdxbc;

void setRewrite(raw_ostream &Stream, uint32_t &Offset) {
const uint32_t DummyValue = std::numeric_limits<uint32_t>::max();
Offset = Stream.tell();
support::endian::write(Stream, DummyValue, llvm::endianness::little);
}

void rewriteOffset(buffer_ostream &Stream, uint32_t Offset) {
uint32_t Value = Stream.tell();
auto *InsertPoint = &Stream.buffer()[Offset];
support::endian::write(InsertPoint, Value, llvm::endianness::little);
}

void RootSignatureDesc::write(raw_ostream &OS) const {
// Root signature header in dxcontainer has 6 uint_32t values.
const uint32_t HeaderSize = 24;
const uint32_t ParameterByteSize = Parameters.size_in_bytes();
const uint32_t NumParametes = Parameters.size();
buffer_ostream Writer(OS);
const uint32_t NumParameters = Parameters.size();
const uint32_t Zero = 0;

// Writing header information
support::endian::write(OS, Header.Version, llvm::endianness::little);
support::endian::write(OS, NumParametes, llvm::endianness::little);
support::endian::write(OS, HeaderSize, llvm::endianness::little);
support::endian::write(Writer, Header.Version, llvm::endianness::little);
support::endian::write(Writer, NumParameters, llvm::endianness::little);

// Static samplers still not implemented
support::endian::write(OS, Zero, llvm::endianness::little);
support::endian::write(OS, ParameterByteSize + HeaderSize,
llvm::endianness::little);
uint32_t HeaderPoint;
setRewrite(Writer, HeaderPoint);

support::endian::write(OS, Header.Flags, llvm::endianness::little);
support::endian::write(Writer, Zero, llvm::endianness::little);
support::endian::write(Writer, Zero, llvm::endianness::little);
support::endian::write(Writer, Header.Flags, llvm::endianness::little);

uint32_t ParamsOffset =
HeaderSize + (3 * sizeof(uint32_t) * Parameters.size());
for (const dxbc::RootParameter &P : Parameters) {
support::endian::write(OS, P.ParameterType, llvm::endianness::little);
support::endian::write(OS, P.ShaderVisibility, llvm::endianness::little);
support::endian::write(OS, ParamsOffset, llvm::endianness::little);
rewriteOffset(Writer, HeaderPoint);

// Size of root parameter, removing the ParameterType and ShaderVisibility.
ParamsOffset += sizeof(dxbc::RootParameter) - 2 * sizeof(uint32_t);
SmallVector<uint32_t> ParamsOffset;
for (const auto &P : Parameters) {
support::endian::write(Writer, P.ParameterType, llvm::endianness::little);
support::endian::write(Writer, P.ShaderVisibility,
llvm::endianness::little);

uint32_t Offset;
setRewrite(Writer, Offset);

ParamsOffset.push_back(Offset);
}

for (const dxbc::RootParameter &P : Parameters) {
assert(NumParameters == ParamsOffset.size());
for (size_t I = 0; I < NumParameters; ++I) {
rewriteOffset(Writer, ParamsOffset[I]);
const auto &P = Parameters[I];

switch (P.ParameterType) {
case dxbc::RootParameterType::Constants32Bit: {
support::endian::write(OS, P.Constants.ShaderRegister,
support::endian::write(Writer, P.Constants.ShaderRegister,
llvm::endianness::little);
support::endian::write(OS, P.Constants.RegisterSpace,
support::endian::write(Writer, P.Constants.RegisterSpace,
llvm::endianness::little);
support::endian::write(OS, P.Constants.Num32BitValues,
support::endian::write(Writer, P.Constants.Num32BitValues,
llvm::endianness::little);
} break;
case dxbc::RootParameterType::Empty:
Expand Down
2 changes: 1 addition & 1 deletion llvm/test/CodeGen/DirectX/ContainerData/RootSignature-Flags.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,6 @@ attributes #0 = { "hlsl.numthreads"="1,1,1" "hlsl.shader"="compute" }
; DXC-NEXT: RootSignature:
; DXC-NEXT: Version: 2
; DXC-NEXT: NumStaticSamplers: 0
; DXC-NEXT: StaticSamplersOffset: 24
; DXC-NEXT: StaticSamplersOffset: 0
; DXC-NEXT: Parameters: []
; DXC-NEXT: AllowInputAssemblerInputLayout: true
2 changes: 1 addition & 1 deletion llvm/test/ObjectYAML/DXContainer/RootSignature-Flags.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ Parts:
# CHECK-NEXT: RootSignature:
# CHECK-NEXT: Version: 2
# CHECK-NEXT: NumStaticSamplers: 0
# CHECK-NEXT: StaticSamplersOffset: 24
# CHECK-NEXT: StaticSamplersOffset: 0
# CHECK-NEXT: Parameters: []
# CHECK-NEXT: AllowInputAssemblerInputLayout: true
# CHECK-NEXT: DenyGeometryShaderRootAccess: true
2 changes: 1 addition & 1 deletion llvm/test/ObjectYAML/DXContainer/RootSignature-MultipleParameters.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -37,7 +37,7 @@ Parts:
# CHECK-NEXT: RootSignature:
# CHECK-NEXT: Version: 2
# CHECK-NEXT: NumStaticSamplers: 0
# CHECK-NEXT: StaticSamplersOffset: 64
# CHECK-NEXT: StaticSamplersOffset: 0
# CHECK-NEXT: Parameters:
# CHECK-NEXT: - ParameterType: Constants32Bit
# CHECK-NEXT: ShaderVisibility: Hull
Expand Down
8 changes: 4 additions & 4 deletions llvm/unittests/ObjectYAML/DXContainerYAMLTest.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -134,12 +134,12 @@ TEST(RootSignature, ParseRootFlags) {
)"));

uint8_t Buffer[] = {
0x44, 0x58, 0x42, 0x43, 0x32, 0x9A, 0x53, 0xD8, 0xEC, 0xBE, 0x35, 0x6F,
0x05, 0x39, 0xE1, 0xFE, 0x31, 0x20, 0xF0, 0xC1, 0x01, 0x00, 0x00, 0x00,
0x44, 0x58, 0x42, 0x43, 0x32, 0x9a, 0x53, 0xd8, 0xec, 0xbe, 0x35, 0x6f,
0x05, 0x39, 0xe1, 0xfe, 0x31, 0x20, 0xf0, 0xc1, 0x01, 0x00, 0x00, 0x00,
0x44, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00,
0x52, 0x54, 0x53, 0x30, 0x18, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x18, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
};

EXPECT_EQ(Storage.size(), 68u);
Expand Down Expand Up @@ -184,7 +184,7 @@ TEST(RootSignature, ParseRootConstants) {
0x85, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00,
0x52, 0x54, 0x53, 0x30, 0x59, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x2c, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x02, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x00, 0x00,
0x0e, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
Expand Down