[Backport to llvm_release_220] Add FP4/FP8 operand support for SubgroupMatrixMultiplyAccumulateINTEL (#3609)#3626
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vmaksimo merged 1 commit intoKhronosGroup:llvm_release_220from Mar 9, 2026
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…upMatrixMultiplyAccumulateINTEL (KhronosGroup#3609) Extend SubgroupMatrixMultiplyAccumulateINTEL to support packed 4-bit and 8-bit floating-point matrix operands by implementing extensions: - SPV_INTEL_subgroup_matrix_multiply_accumulate_float4 - SPV_INTEL_subgroup_matrix_multiply_accumulate_float8 These extensions add operand flags that interpret packed integer data as FP4/FP8 without requiring actual FP4/FP8 type support added by SPV_INTEL_float4 or SPV_EXT_float8. FP4 operands: `MatrixAPackedFloat4E2M1INTEL` (0x40000) / `MatrixBPackedFloat4E2M1INTEL` (0x80000) FP8 operands: `MatrixAPackedFloat8E4M3INTEL` (0x4000) / `MatrixBPackedFloat8E4M3INTEL` (0x8000) `MatrixAPackedFloat8E5M2INTEL` (0x10000) / `MatrixBPackedFloat8E5M2INTEL` (0x20000) Specs: https://github.com/intel/llvm/blob/sycl/sycl/doc/design/spirv-extensions/SPV_INTEL_subgroup_matrix_multiply_accumulate_float4.asciidoc https://github.com/intel/llvm/blob/sycl/sycl/doc/design/spirv-extensions/SPV_INTEL_subgroup_matrix_multiply_accumulate_float8.asciidoc
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Reopening to retrigger Out-of-tree checks (should pass after #3635) |
vmaksimo
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Extend SubgroupMatrixMultiplyAccumulateINTEL to support packed 4-bit and
8-bit floating-point matrix operands by implementing extensions:
These extensions add operand flags that interpret packed integer data as
FP4/FP8 without requiring actual FP4/FP8 type support added by
SPV_INTEL_float4 or SPV_EXT_float8.
FP4 operands:
MatrixAPackedFloat4E2M1INTEL(0x40000) /MatrixBPackedFloat4E2M1INTEL(0x80000)FP8 operands:
MatrixAPackedFloat8E4M3INTEL(0x4000) /MatrixBPackedFloat8E4M3INTEL(0x8000)
MatrixAPackedFloat8E5M2INTEL(0x10000) /MatrixBPackedFloat8E5M2INTEL(0x20000)Specs:
https://github.com/intel/llvm/blob/sycl/sycl/doc/design/spirv-extensions/SPV_INTEL_subgroup_matrix_multiply_accumulate_float4.asciidoc
https://github.com/intel/llvm/blob/sycl/sycl/doc/design/spirv-extensions/SPV_INTEL_subgroup_matrix_multiply_accumulate_float8.asciidoc