[all-commits] [llvm/llvm-project] 0454dd: [StaleProfileMatching] Use only profile anchor siz...

[Lei Wang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0454dd8c48cd771478f1ae53330ba78e71bcd7cb
      https://github.com/llvm/llvm-project/commit/0454dd8c48cd771478f1ae53330ba78e71bcd7cb
  Author: Lei Wang <wlei at fb.com>
  Date:   2025-02-13 (Thu, 13 Feb 2025)

  Changed paths:
    M llvm/lib/Transforms/IPO/SampleProfileMatcher.cpp
    M llvm/test/Transforms/SampleProfile/pseudo-probe-stale-profile-renaming.ll

  Log Message:
  -----------
  [StaleProfileMatching] Use only profile anchor size for similarity calculation (#126783)

We observed that the number of IR anchors is usually greater than the
number of profile anchors, because IR anchors can be optimized away
later and llvm-profgen might not generate profiles for cold callsites.
This can cause missing function matches. I’m changing the similarity
calculation to use only the profile anchor size. In another point of
view, It also makes sense to reuse as many profile anchors as possible
regardless of the new functions in the IR.



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