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{
  "commit": "c54764e8dffa9e02c03ba28f28ccbdbc3504fd2b",
  "tree": "77b6ee13b86b2dde57c5c8caed224c7ccdee44f0",
  "parents": [
    "5ed90416b82523b26d0d8fdc9919a25a30ea5fad"
  ],
  "author": {
    "name": "Quinn Dawkins",
    "email": "quinn.dawkins@gmail.com",
    "time": "Fri Dec 12 09:24:56 2025 -0800"
  },
  "committer": {
    "name": "GitHub",
    "email": "noreply@github.com",
    "time": "Fri Dec 12 12:24:56 2025 -0500"
  },
  "message": "[Codegen] Add PCF dialect (#22804)\n\nThis introduces a new dialect for \"Parallel Control Flow\" (named a la\nscf). This is motivated by expressivity gaps in the current constructs\nwe use to represent distributed compute for the next set of algorithms\nwe\u0027re working towards supporting in the compiler. To name a few:\n - Stream-K\n - Warp/Clustered reductions\n - Named Barriers\n - Improved robustness of fusion support\n - Persistent-ish kernels (things that need to communicate across wkgps)\n\nNaturally the base added here does not directly cover all of the above\nbut should make it much easier to do so. The core idea behind the\ndialect hinges on three concepts:\n1. Shaped references of unspecified layout and memspace\n2. Execution scopes which threads are forked out of\n3. Synchronization scopes which control access to associated memory\n\nThe dialect includes further documentation behind the above 3 points.\n\nThe initial proposal can be found here:\nhttps://hackmd.io/iHdqgU7MQnSvX6H_y_6JrQ (Much of the\nnaming/representation has changed since this writeup)",
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