[all-commits] [llvm/llvm-project] adb290: [Sema][SVE] Reject atomic sizeless types

[rsandifo-arm via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: adb290d97482aa9311ee4b4b5917a0f2ece55b30
      https://github.com/llvm/llvm-project/commit/adb290d97482aa9311ee4b4b5917a0f2ece55b30
  Author: Richard Sandiford <richard.sandiford at arm.com>
  Date:   2020-03-12 (Thu, 12 Mar 2020)

  Changed paths:
    M clang/include/clang/Basic/DiagnosticSemaKinds.td
    M clang/lib/Sema/SemaType.cpp
    M clang/test/Sema/sizeless-1.c
    M clang/test/SemaCXX/sizeless-1.cpp

  Log Message:
  -----------
  [Sema][SVE] Reject atomic sizeless types

It would be difficult to guarantee atomicity for sizeless types,
so the SVE ACLE makes atomic sizeless types invalid.  As it happens,
we already rejected them before the patch, but for the wrong reason:

  error: _Atomic cannot be applied to type 'svint8_t' (aka '__SVInt8_t')
  which is not trivially copyable

The SVE types should be treated as trivially copyable; a later
patch fixes that.

Differential Revision: https://reviews.llvm.org/D75734