[SPIR-V] Implement WaveMutliPrefix* #6608
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Keenuts
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Keenuts
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sudonatalie
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A follow-up change will use the PartitionedExclusiveScanNV GroupOperation, which requires that an additional operand is added to all GroupNonUniformArithmetic instructions. This means that some of the SPIR-V opcodes which are currently categorized as unary will become either unary or binary depending on the GroupOp. Since the arity distinctions between the OpGroupNonUniform* instructions were already somewhat arbitrary, I'm prefacing that change by refactoring them into a single SpirvGroupNonUniformOp instruction type for better reusability. Follow up: #6608
Implements the Shader Model 6.5 WaveMultiPrefix* intrinsic functions
using the group operation from SPV_NV_shader_subgroup_partitioned,
PartitionedExclusiveScanNV, which performs a partitioned exclusive scan
operation across a subset of invocations ("lanes") in a subgroup
("wave"). The subset of the partition is determined by the provided
ballot ("mask") parameter, which follows the same requirements for
valid partitioning and active invocations/lanes as the HLSL parameter.
Note that WaveMultiPrefixCountBits remains unimplemented because it does
not directly map to a SPIR-V GroupNonUniformArithmetic instruction that
accepts the PartitionedExclusiveScanNV Group Operation.
DirectX Spec: https://microsoft.github.io/DirectX-Specs/d3d/HLSL_ShaderModel6_5.html#wavemultiprefix-functions
SPIR-V Extension: https://htmlpreview.github.io/?https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/NV/SPV_NV_shader_subgroup_partitioned.html
Depends on microsoft#6596
Fixes microsoft#6600
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s-perron
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May 17, 2024
SjMxr233
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Jul 24, 2025
A follow-up change will use the PartitionedExclusiveScanNV GroupOperation, which requires that an additional operand is added to all GroupNonUniformArithmetic instructions. This means that some of the SPIR-V opcodes which are currently categorized as unary will become either unary or binary depending on the GroupOp. Since the arity distinctions between the OpGroupNonUniform* instructions were already somewhat arbitrary, I'm prefacing that change by refactoring them into a single SpirvGroupNonUniformOp instruction type for better reusability. Follow up: microsoft#6608
SjMxr233
pushed a commit
to ShaderHelper/DirectXShaderCompiler
that referenced
this pull request
Jul 24, 2025
Implements the Shader Model 6.5 WaveMultiPrefix* intrinsic functions
using the group operation from SPV_NV_shader_subgroup_partitioned,
PartitionedExclusiveScanNV, which performs a partitioned exclusive scan
operation across a subset of invocations ("lanes") in a subgroup
("wave"). The subset of the partition is determined by the provided
ballot ("mask") parameter, which follows the same requirements for
valid partitioning and active invocations/lanes as the HLSL parameter.
Note that WaveMultiPrefixCountBits remains unimplemented because it does
not directly map to a SPIR-V GroupNonUniformArithmetic instruction that
accepts the PartitionedExclusiveScanNV Group Operation.
DirectX Spec:
https://microsoft.github.io/DirectX-Specs/d3d/HLSL_ShaderModel6_5.html#wavemultiprefix-functions
SPIR-V Extension:
https://htmlpreview.github.io/?https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/NV/SPV_NV_shader_subgroup_partitioned.html
Depends on microsoft#6596
Fixes microsoft#6600
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Implements the Shader Model 6.5 WaveMultiPrefix* intrinsic functions
using the group operation from SPV_NV_shader_subgroup_partitioned,
PartitionedExclusiveScanNV, which performs a partitioned exclusive scan
operation across a subset of invocations ("lanes") in a subgroup
("wave"). The subset of the partition is determined by the provided
ballot ("mask") parameter, which follows the same requirements for
valid partitioning and active invocations/lanes as the HLSL parameter.
Note that WaveMultiPrefixCountBits remains unimplemented because it does
not directly map to a SPIR-V GroupNonUniformArithmetic instruction that
accepts the PartitionedExclusiveScanNV Group Operation.
DirectX Spec: https://microsoft.github.io/DirectX-Specs/d3d/HLSL_ShaderModel6_5.html#wavemultiprefix-functions
SPIR-V Extension: https://htmlpreview.github.io/?https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/NV/SPV_NV_shader_subgroup_partitioned.html
Depends on #6596
Fixes #6600