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{
  "commit": "5d9eaeed92bbdd3102ba06e50686b5470df016c0",
  "tree": "d01fab5a06df376a9522758b99ba91ee817ef46b",
  "parents": [
    "4495c739b3e5376aba933a8b402e225994b91b82"
  ],
  "author": {
    "name": "Benoit Jacob",
    "email": "jacob.benoit.1@gmail.com",
    "time": "Thu Jun 11 11:19:01 2026 -0400"
  },
  "committer": {
    "name": "GitHub",
    "email": "noreply@github.com",
    "time": "Thu Jun 11 11:19:01 2026 -0400"
  },
  "message": "[Codegen][CPU] Seed C-bitcode ukernel framework with bf16 and i8 seeds. (#24567)\n\nAdds compiler/plugins/target/LLVMCPU/builtins/ukernel/, the new home for\nLLVMCPU-only C microkernels. Modelled after the ROCM C ukernel framework\n(compiler/plugins/target/ROCM/builtins/ukernel/): compile each ukernel\nto LLVM bitcode, embed those .bc files into iree-compile, and emit them\nas self-contained `hal.executable_object`s on dispatch variants —\ndistinct from the legacy mmt4d ukernels under runtime/, which serve a\nnow-defunct VMVX path and are built twice.\n\nThis first commit lands the scaffolding plus two inner-K-loop seeds with\nstub bodies (filled in by a later commit):\n* `iree_uk_mma_x86_avx512bf16_1x16x2_f32_bf16.c` (bf16 x bf16 -\u003e f32)\nand `iree_uk_mma_x86_avx512vnni_16x16x2_i32_i8_casti16.c` (i8 x i8 -\u003e\ni32 via VNNI), plus `common.h` (no-stdlib stdint replacements);\n* `iree_bitcode_library` + `iree_c_embed_data` rules, driven by a\n`(stem, features, copts)` table so adding a seed is one row (CMake\nregenerated; `iree_bitcode_library` in `bazel_to_cmake_converter.py`\nextended to forward `out`, so the embedded filename is\n`\u003cname\u003e.\u003carch\u003e_\u003cfeatures\u003e.bc`);\n* a `README.md` design doc covering scope, build, IR representation,\nend-to-end flow, and authoring/test guidance;\n* `#iree_cpu.ukernel_provider`, the CPU analogue of\n`#rocm.ukernel_provider`, declared in `IREECPUAttrs.td`/`.cpp` with a\n`createAndReplaceWithUkernelOp` that currently delegates to the default\n`LowerBitcodeUKernelsPass` fallback. Specialized `inner_tiled` handling\n(threading `intrinsics_{m,n,k}` and the outer K count) will land in a\nfollow-up alongside `SelectUKernels` and pipeline integration.\n\nTests:\n* roundtrip lit test for the new `#iree_cpu.ukernel_provider` attribute;\n* lit tests running `--iree-codegen-lower-bitcode-ukernels` on ops\ncarrying both `iree_codegen.ukernel \u003d \"...\"` and a user-supplied\n`hal.executable.objects` bitcode (one per seed), asserting they are\nrewritten to `iree_codegen.ukernel.generic` with the bitcode preserved.\n\nProgress towards https://github.com/iree-org/iree/issues/24574.\n\n---------\n\nSigned-off-by: Benoit Jacob \u003cjacob.benoit.1@gmail.com\u003e\nCo-authored-by: Claude Opus 4.8 (1M context) \u003cnoreply@anthropic.com\u003e",
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