[all-commits] [llvm/llvm-project] fbf81e: Enable attaching LLVM loop annotations to scf.for ...

[xiaoleis-nv via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fbf81e300489f0489edab20493f1db02e2a3bc74
      https://github.com/llvm/llvm-project/commit/fbf81e300489f0489edab20493f1db02e2a3bc74
  Author: xiaoleis-nv <99947620+xiaoleis-nv at users.noreply.github.com>
  Date:   2024-08-12 (Mon, 12 Aug 2024)

  Changed paths:
    M mlir/lib/Conversion/SCFToControlFlow/SCFToControlFlow.cpp
    M mlir/test/Conversion/SCFToControlFlow/convert-to-cfg.mlir

  Log Message:
  -----------
  Enable attaching LLVM loop annotations to scf.for (#102562)

We recently discovered that the loop with a dynamic upper bound is
unexpectedly unrolled during the NVVM to PTX process. By attaching the
`llvm.loop_annotation`, we can control the unrolling behavior precisely.

This PR enables the `cf.cond_br` to retain the loop annotation of
`scf.for` after the `convert-scf-to-cf` pass. This change allows users
to have precise control over the loop behavior during backend
transformation.

---------

Co-authored-by: Xiaolei Shi <xiaoleis at nvidia.com>



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