[all-commits] [llvm/llvm-project] 8cf0f9: [msan] Add conservative handling of vscale params ...

[Vitaly Buka via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8cf0f9ab2f32114afd615def833f66ebeeede7d5
      https://github.com/llvm/llvm-project/commit/8cf0f9ab2f32114afd615def833f66ebeeede7d5
  Author: Vitaly Buka <vitalybuka at google.com>
  Date:   2024-04-26 (Fri, 26 Apr 2024)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
    M llvm/test/Instrumentation/MemorySanitizer/vscale.ll

  Log Message:
  -----------
  [msan] Add conservative handling of vscale params (#90167)

Msan uses `__msan_param_tls` to pass shadow of
arguments. Position of arguments is expected to be
available during compile time, if size of the
argument is know. This is not true for vscale.

As work around we require that vscale parameters
are always initialized, then we don't need to pass
shadow.

Ret val should work out of the box as we don't
need to know size compile time.



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