[all-commits] [llvm/llvm-project] 20e8de: [InstCombine] Support nested GEPs in OptimizePoint...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 20e8de9c8f4cf54c6c57535428c987d921861034
      https://github.com/llvm/llvm-project/commit/20e8de9c8f4cf54c6c57535428c987d921861034
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2025-06-10 (Tue, 10 Jun 2025)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
    M llvm/test/Transforms/InstCombine/icmp.ll
    M llvm/test/Transforms/InstCombine/sub-gep.ll

  Log Message:
  -----------
  [InstCombine] Support nested GEPs in OptimizePointerDifference (#142958)

Currently OptimizePointerDifference() only handles single GEPs with a
common base, not GEP chains. This patch generalizes the support to
nested GEPs with a common base.

Finding the common base is a bit annoying because we want to stop as
soon as possible and not recurse into common GEP prefixes.

This helps avoids regressions from
https://github.com/llvm/llvm-project/pull/137297.



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