[all-commits] [llvm/llvm-project] 4e7628: [GlobalISel] Restrict value offset tracking to agg...

[Cullen Rhodes via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4e7628708d6d09c4051fd1fa54cb6b517db326fe
      https://github.com/llvm/llvm-project/commit/4e7628708d6d09c4051fd1fa54cb6b517db326fe
  Author: Cullen Rhodes <cullen.rhodes at arm.com>
  Date:   2026-09-09 (Wed, 09 Sep 2026)

  Changed paths:
    M llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

  Log Message:
  -----------
  [GlobalISel] Restrict value offset tracking to aggregates (NFC) (#221287)

The single-vreg fast path added in d30d5fe8dd5d3 still populated an
offset list, even though offsets are only necessary for aggregate
values.

This wasn't the only place doing so. Avoid creating or updating offset
lists for non-aggregate values and add an assertion to enforce this
invariant.

Small -0.04% geomean improvement on CTMark aarch64-O0-g.

https://llvm-compile-time-tracker.com/compare.php?from=97cbc1e404b980edc58bfbcabb6f1c61793b624b&to=2aeb9d236a2cacf8ab93722b8b629243384bae68&stat=instructions:u

Assisted-by: codex



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