[all-commits] [llvm/llvm-project] e146e2: [ConstraintElim] Use largest usable bound to check...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e146e27ab993d013ab16a706f0fd84ab3818b575
      https://github.com/llvm/llvm-project/commit/e146e27ab993d013ab16a706f0fd84ab3818b575
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2026-09-09 (Wed, 09 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Scalar/ConstraintElimination.cpp
    M llvm/test/Transforms/ConstraintElimination/add-nsw.ll
    M llvm/test/Transforms/ConstraintElimination/pr70510.ll

  Log Message:
  -----------
  [ConstraintElim] Use largest usable bound to check no-wrap regions. (#222295)

The unsigned no-wrap region of an add with a constant operand has
UMAX - C as upper bound. For 64 bit operations, the upper bound is
usually larger than MaxConstraintValue, so it will be decomposed as
variable instead of a constant value.

This improves results end-to-end in a few more cases, without any
additional queries:
https://github.com/dtcxzyw/llvm-opt-benchmark-nightly/pull/1234.

PR: https://github.com/llvm/llvm-project/pull/222295



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