[all-commits] [llvm/llvm-project] ab1597: CallPromotionUtils: Correctly use IndexSize when d...

[Owen Anderson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ab15976173e45fd02eb61e922a95ad1f5127c9a0
      https://github.com/llvm/llvm-project/commit/ab15976173e45fd02eb61e922a95ad1f5127c9a0
  Author: Owen Anderson <resistor at mac.com>
  Date:   2024-12-11 (Wed, 11 Dec 2024)

  Changed paths:
    M llvm/lib/Transforms/Utils/CallPromotionUtils.cpp
    A llvm/test/Transforms/Inline/promote-call-bitwidth.ll

  Log Message:
  -----------
  CallPromotionUtils: Correctly use IndexSize when determining the bit width of pointer offsets. (#119483)

This reapplies #119138 with a defensive fix for the assertion failure
when building libcxx.
Unfortunately the failure does not reproduce on my machine, so I am not
able to extract a test case.

The key insight for the fix comes from Jessica Clarke, who observes that
`VTablePtr` may, in fact,
not be a pointer on return from `FindAvailableLoadedValue`.

Co-authored-by: Alexander Richardson <alexander.richardson at cl.cam.ac.uk>



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