[all-commits] [llvm/llvm-project] 01a103: [llvm] Fix __builtin_object_size interaction betwe...

[serge-sans-paille via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 01a103b0b9c449e8dec17950835991757d1c4f88
      https://github.com/llvm/llvm-project/commit/01a103b0b9c449e8dec17950835991757d1c4f88
  Author: serge-sans-paille <sguelton at mozilla.com>
  Date:   2024-11-02 (Sat, 02 Nov 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/MemoryBuiltins.h
    M llvm/lib/Analysis/MemoryBuiltins.cpp
    M llvm/test/Transforms/LowerConstantIntrinsics/builtin-object-size-phi.ll
    M llvm/test/Transforms/LowerConstantIntrinsics/objectsize_basic.ll

  Log Message:
  -----------
  [llvm] Fix __builtin_object_size interaction between Negative Offset … (#111827)

…and Select/Phi

When picking a SizeOffsetAPInt through combineSizeOffset, the behavior
differs if we're going to apply a constant offset that's positive or
negative: If it's positive, then we need to compare the remaining bytes
(i.e. Size
- Offset), but if it's negative, we need to compare the preceding bytes
(i.e. Offset).

Fix #111709



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