[all-commits] [llvm/llvm-project] f90593: Fix tbaa.struct metadata for bitfields using big e...

[Julian Nagele via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f905935ff96da4c04d2a6bf431340fd16e3a14ea
      https://github.com/llvm/llvm-project/commit/f905935ff96da4c04d2a6bf431340fd16e3a14ea
  Author: Julian Nagele <j.nagele at apple.com>
  Date:   2024-04-05 (Fri, 05 Apr 2024)

  Changed paths:
    M clang/lib/CodeGen/CodeGenTBAA.cpp
    M clang/test/CodeGen/tbaa-struct-bitfield-endianness.cpp

  Log Message:
  -----------
  Fix tbaa.struct metadata for bitfields using big endian. (#87753)

When generating tbaa.struct metadata we treat multiple adjacent
bitfields as a single "field", with one corresponding entry in the
metadata. At the moment this is achieved by adding an entry for the
first bitfield in the run using its StorageSize and skipping the
remaining bitfields. The problem is that "first" is determined by
checking that the Offset of the field in the run is 0, which breaks for
big endian.

PR: https://github.com/llvm/llvm-project/pull/87753



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