[all-commits] [llvm/llvm-project] 8198f3: [lld-macho] Account for alignment in thunk inserti...

[Jez Ng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8198f30f7e756e3368c3eda62ecc3d0cc62d1570
      https://github.com/llvm/llvm-project/commit/8198f30f7e756e3368c3eda62ecc3d0cc62d1570
  Author: Jez Ng <jezng at fb.com>
  Date:   2023-02-14 (Tue, 14 Feb 2023)

  Changed paths:
    M lld/MachO/ConcatOutputSection.cpp
    A lld/test/MachO/arm64-thunk-for-alignment.s

  Log Message:
  -----------
  [lld-macho] Account for alignment in thunk insertion algorithm

We previously neglected this, leading us to underestimate the maximum
possible branch address offset.

Fixing this should allow us to reduce `slop` to more reasonable
levels. I've lowered it to 256 for now, though I suspect we could go
lower.

Fixes https://github.com/llvm/llvm-project/issues/59259.

Reviewed By: serge-sans-paille

Differential Revision: https://reviews.llvm.org/D144029