[all-commits] [llvm/llvm-project] 6909c1: [ConstraintElim] Don't request SCEV if there are n...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6909c17f14683203621f5a3d8fbf04dfd5d9c623
      https://github.com/llvm/llvm-project/commit/6909c17f14683203621f5a3d8fbf04dfd5d9c623
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-09-27 (Sun, 27 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Scalar/ConstraintElimination.cpp
    M llvm/test/Transforms/ConstraintElimination/analysis-invalidation.ll

  Log Message:
  -----------
  [ConstraintElim] Don't request SCEV if there are no loops. (NFC) (#226736)

ConstraintElimination only uses SCEV when there are any loops. Don't
request the analysis if there are no loops.

This reduces compile-time a bit (more for workloads with large number of
functions w/o loops):

stage1-O3: -0.03%
stage1-ReleaseThinLTO: -0.04%
stage1-ReleaseLTO-g: -0.02%
stage1-aarch64-O3: -0.03%
stage2-O3: -0.04%
stage2-clang: -0.09%


https://llvm-compile-time-tracker.com/compare.php?from=899d817c7950c997402cd229935cd822acf45b08&to=c4453240417d8705b0752c3feda8d02365f8175c&stat=instructions:u

PR: https://github.com/llvm/llvm-project/pull/226736



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