[all-commits] [llvm/llvm-project] f3d061: [CaptureTracking] Don't consider comparison of inb...

Nikita Popov via All-commits all-commits at lists.llvm.org
Thu Jul 6 07:49:01 PDT 2023

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f3d0613d852a90563a1e8704930a6e79368f106a
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2023-07-06 (Thu, 06 Jul 2023)

  Changed paths:
    M llvm/lib/Analysis/CaptureTracking.cpp
    M llvm/test/Transforms/FunctionAttrs/nocapture.ll

  Log Message:
  [CaptureTracking] Don't consider comparison of inbounds GEP with nonnull non-capturing

This is required to bring CaptureTracking in line with the new
semantics from D154051, as gep inbounds p, 0 is now always non-poison.

There are many ways in which the inbounds special case could be
preserved: If the index is known non-zero, or there is an inbounds
chain down to an identified object, etc. However, I have opted to
drop the special case entirely, as it appears to be low value:
In cases where we can determine such things (e.g. the affected test
cases) we would end up removing the compare via isGEPKnownNonNull()
logic anyway.

Differential Revision: https://reviews.llvm.org/D154054

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