)]}'
{
  "commit": "bbf54e4525322cd09bfa502da20b72ab31d942d1",
  "tree": "1bfd038e70279be107759238783e0fa88518ffda",
  "parents": [
    "ce2de4628c3ffb543c6e2c74f927ab8e4f07ad89"
  ],
  "author": {
    "name": "Quinn Dawkins",
    "email": "quinn.dawkins@gmail.com",
    "time": "Fri Apr 17 10:27:20 2026 -0700"
  },
  "committer": {
    "name": "GitHub",
    "email": "noreply@github.com",
    "time": "Fri Apr 17 13:27:20 2026 -0400"
  },
  "message": "[Codegen][PCF] Add foldForallIntoPCFLoop for split-k loop handling (#23452)\n\nAdds a generic `foldForallIntoPCFLoop` function that folds an\n`scf.forall` containing a `pcf.loop` into a single `pcf.generic`\noperation. This enables incorporating user expressed extra levels of\nparallelism into a scope. The immediate use case this enables is split-k\nby folding the split-k loop into the workgroup loop.\n\nKey changes:\n- Add `foldForallIntoPCFLoop` API in PCF/Transforms/Transforms.h\n- Implement structural matching helpers (matchFoldTerminator,\nmatchFoldPCFLoop, matchFoldWriteSlices) that validate requirements\nwithout scope-specific logic\n- Add TestFoldForallIntoPCFLoopPass for unit testing with local_mapping\n+ sequential scope\n- Add FoldSplitKWorkgroupLoop pattern in ConvertWorkgroupForallToPCF.cpp\nthat matches split_reduction_mapping + workgroup_scope and calls the\ngeneric fold\n- Run fold pattern as second pass in ConvertWorkgroupForallToPCFPass\n\nThe fold operation:\n1. Creates pcf.generic with same scope as inner pcf.loop\n2. Linearizes forall iteration space and delinearizes inside generic\n3. Converts pcf.loop to a nested scf.forall loop to handle spillover\n4. Composes tensor.parallel_insert_slice with pcf.write_slice ops\n\nThe reason this pattern has to generate a pcf.generic instead of\npcf.loop is to avoid extra execution of code that was inside\nthe scf.forall but not inside the pcf.loop.\n\n---------\n\nCo-authored-by: Claude Opus 4.6 \u003cnoreply@anthropic.com\u003e",
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