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Diffstat (limited to '')
| -rw-r--r-- | vendor/portable-atomic/README.md | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/vendor/portable-atomic/README.md b/vendor/portable-atomic/README.md index dbc347e16..7d364feb2 100644 --- a/vendor/portable-atomic/README.md +++ b/vendor/portable-atomic/README.md @@ -16,7 +16,7 @@ Portable atomic types including support for 128-bit atomics, atomic float, etc. - Provide atomic load/store for targets where atomic is not available at all in the standard library. (RISC-V without A-extension, MSP430, AVR) - Provide atomic CAS for targets where atomic CAS is not available in the standard library. (thumbv6m, pre-v6 ARM, RISC-V without A-extension, MSP430, AVR, Xtensa, etc.) (always enabled for MSP430 and AVR, [optional](#optional-features-critical-section) otherwise) - Provide stable equivalents of the standard library's atomic types' unstable APIs, such as [`AtomicPtr::fetch_*`](https://github.com/rust-lang/rust/issues/99108), [`AtomicBool::fetch_not`](https://github.com/rust-lang/rust/issues/98485). -- Make features that require newer compilers, such as [`fetch_{max,min}`](https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#method.fetch_max), [`fetch_update`](https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#method.fetch_update), [`as_ptr`](https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#method.as_ptr), and [stronger CAS failure ordering](https://github.com/rust-lang/rust/pull/98383) available on Rust 1.34+. +- Make features that require newer compilers, such as [`fetch_{max,min}`](https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#method.fetch_max), [`fetch_update`](https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#method.fetch_update), [`as_ptr`](https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#method.as_ptr), [`from_ptr`](https://doc.rust-lang.org/std/sync/atomic/struct.AtomicUsize.html#method.from_ptr) and [stronger CAS failure ordering](https://github.com/rust-lang/rust/pull/98383) available on Rust 1.34+. - Provide workaround for bugs in the standard library's atomic-related APIs, such as [rust-lang/rust#100650], `fence`/`compiler_fence` on MSP430 that cause LLVM error, etc. <!-- TODO: @@ -170,7 +170,7 @@ RUSTFLAGS="--cfg portable_atomic_no_outline_atomics" cargo ... If dynamic dispatching by run-time CPU feature detection is enabled, it allows maintaining support for older CPUs while using features that are not supported on older CPUs, such as CMPXCHG16B (x86_64) and FEAT_LSE (aarch64). Note: - - Dynamic detection is currently only enabled in Rust 1.61+ for aarch64, in Rust 1.59+ (AVX) or 1.69+ (CMPXCHG16B) for x86_64, nightly only for powerpc64 (disabled by default), otherwise it works the same as when this cfg is set. + - Dynamic detection is currently only enabled in Rust 1.59+ for aarch64, in Rust 1.59+ (AVX) or 1.69+ (CMPXCHG16B) for x86_64, nightly only for powerpc64 (disabled by default), otherwise it works the same as when this cfg is set. - If the required target features are enabled at compile-time, the atomic operations are inlined. - This is compatible with no-std (as with all features except `std`). - On some targets, run-time detection is disabled by default mainly for compatibility with older versions of operating systems or incomplete build environments, and can be enabled by `--cfg portable_atomic_outline_atomics`. (When both cfg are enabled, `*_no_*` cfg is preferred.) |