[all-commits] [llvm/llvm-project] 85a847: [libc++] Simplify features for detecting atomics' ...

[Konstantin Varlamov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 85a847fd1d639a0e7d5319b17e994ea157be6046
      https://github.com/llvm/llvm-project/commit/85a847fd1d639a0e7d5319b17e994ea157be6046
  Author: Konstantin Varlamov <varconsteq at gmail.com>
  Date:   2024-01-30 (Tue, 30 Jan 2024)

  Changed paths:
    M libcxx/test/libcxx/atomics/atomics.align/align.pass.cpp
    M libcxx/test/libcxx/atomics/atomics.types.generic/atomics.types.float/lockfree.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/assign.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/compare_exchange_strong.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/compare_exchange_weak.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/ctor.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/exchange.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_add.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/fetch_sub.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/load.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/lockfree.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/notify_all.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/notify_one.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.float.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.minus_equals.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/operator.plus_equals.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/store.pass.cpp
    M libcxx/test/std/atomics/atomics.types.generic/atomics.types.float/wait.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange_explicit.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_init.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_is_lock_free.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load_explicit.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store_explicit.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_all.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_notify_one.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait.pass.cpp
    M libcxx/test/std/atomics/atomics.types.operations/atomics.types.operations.wait/atomic_wait_explicit.pass.cpp
    M libcxx/test/support/atomic_helpers.h
    M libcxx/utils/libcxx/test/features.py

  Log Message:
  -----------
  [libc++] Simplify features for detecting atomics' support. (#75553)

`non-lockfree-atomics` is very similar to `has-64-bit-atomics`; to
simplify, we can have uniform features for atomic types of
increasing sizes (`has-128-bit-atomics`, `has-256-bit-atomics`, etc.).

`is-lockfree-runtime-function` feature was a workaround for the partial
support for large atomic types on older versions of macOS (see
https://reviews.llvm.org/D91911). While we still support macOS 10.14,
conceptually it's simpler to check for support for all the atomic
functionality inside the `has-*-atomics` features, and the workaround is
no longer worth the maintenance cost.