1.13.1

• Update to stabilized PowerPC64 inline assembly. (92b02f8a)

• Work around rustc_codegen_gcc bugs on x86_64. (ae4c501)

• Optimize x86_64 128-bit atomics. (a9d61eb, 90a17ca4)

• Improve compile-time detection of RISC-V target features. (535fced)

• Enable release immutability.

portable-atomic-util 0.2.5

• Add Arc::{new_zeroed,new_zeroed_slice} at Rust 1.36+. (align to the std Arc change in Rust 1.92) (f8affb6, ae5aba7)

• Implement Default for Pin<Arc<T>: Default>. (align to the std Arc change in Rust 1.91) (2d8d33c)

• Implement From<&mut {[T],str}> for Arc<{[T],str}> at Rust 1.36+. (align to the std Arc change in Rust 1.84) (99640d6, ae5aba7)

• Implement {AsFd, AsRawFd} for Arc<T> on Trusty. (1b09ffb)

• Support slice-related methods that previously required Rust 1.44+ at Rust 1.36+. (ae5aba7)

• Support AsRawFd for Arc<T> implementation on Unix in all Rust versions. Previously, it was only for Rust 1.63+. (1b09ffb)

• Fix build error when building for HermitOS with std feature in Rust 1.63-1.68. (1b09ffb)

• Documentation improvements.

• Enable release immutability.

1.13.0

• Add unsafe-assume-privileged feature / portable_atomic_unsafe_assume_privileged cfg for safer lock-based fallback on multi-core privileged environments. (b084ee1)

• Support unsafe-assume-single-core/unsafe-assume-privileged on all 32-bit Arm targets. Previously it was only M-profile and pre-v6 targets. (7e07f5e)

• Make AtomicPtr::fetch_* strict-provenance compatible on all environments. Previously it was only strict-provenance compatible on cfg(miri) and otherwise permissive-provenance compatible. (4306943)

• Ensure sequential consistency in lock-based fallback when SeqCst is used. (7e80742)

• Support compile-time detection for x86_64 VMOVDQA. (f7bb1aa)

• Improve compile-time detection of s390x miscellaneous-extensions-3. (11045fe)

• Optimize AVR 8-bit swap when RMW instructions available. (8cedb34)

• Optimize interrupt restore on RISC-V. (9b97a2a)

1.12.0

• Fix build error on no-std pre-v6 Arm targets due to the recent upstream change. (83f6f3e)

• Support unsafe-assume-single-core feature / portable_atomic_unsafe_assume_single_core cfg for targets with CAS. (38e9572)

• Improve compile-time detection of s390x target feature. (5ae0ef5)

• Documentation improvements. (c84f720)

1.11.1

• Fix build error when building aarch64/arm64ec/powerpc64/s390x targets for Miri or ThreadSanitizer since nightly-2025-05-31.

• aarch64: Optimize atomic floats when FEAT_LSFE is enabled. (#201)

• Improve compile-time detection of RISC-V Zacas extension. (b7634e2)

• Improve run-time detection on linux-musl. (7fdad7f)

1.11.0

• Work around nightly-2025-02-24 rustc regression causing "cannot use value of type *mut T for inline assembly" error on RISC-V without A extension, MSP430, and pre-v6 no-std Arm targets. (eeb0235)

• Support AtomicF16 and AtomicF128 for unstable f16 and f128 under unstable cfgs. (#200)

• RISC-V Zacas extension support is no longer experimental. (#206)

• Improve support of run-time detection and outline-atomics:

  • riscv: Enable run-time detection of Zacas extension by default on Linux/Android. (#207)
  • aarch64: Support run-time detection of FEAT_LRCPC3/FEAT_LSE128 on FreeBSD. (6a5075d)
  • powerpc64: Support run-time detection of quadword-atomics on AIX (currently disabled by default because detection support for AIX is experimental). (#102)

1.10.0

• Update to stabilized s390x and Arm64EC inline assembly. (97645c1, e1d1a97)

• Make get_mut const fn on Rust 1.83+. (0dea68c)

• Make from_ptr const fn on Rust 1.83+. (align to the std atomic change in Rust 1.84) (50532d8)

• Various optimizations:

  • RISC-V without A-extension: Optimize 16-bit fetch_not when Zabha enabled. (a487a09)
  • s390x: Optimize 128-bit CAS/RMW. (fba028d, 33ab2c1)
  • PowerPC64: Optimize 128-bit Acquire/AcqRel/SeqCst CAS/RMW and 128-bit CAS with Relaxed failure ordering. (33ab2c1)
  • AVR: Optimize 8-bit load/store. (33ab2c1)

• Improve support of run-time detection and outline-atomics:

  • Enable run-time detection by default on powerpc64 and aarch64 linux-uclibc. (#193)
  • Improve run-time detection of powerpc64 quadword-atomics. (1e3bfda)
  • Improve run-time detection of Zhaoxin CPU. (f283d2a)

• Support RISC-V Zacas extension on pre-1.82 rustc. (#194)

• Improve compile-time detection of RISC-V Zaamo/Zabha extensions. (673137a)

• Respect RUSTC_BOOTSTRAP=-1 recently added in nightly in rustc version detection. (5b2847a)

portable-atomic-util 0.2.4

• Add unstable portable_atomic_unstable_coerce_unsized cfg (requires Rust nightly). (#195, thanks @brodycj)

• Respect RUSTC_BOOTSTRAP=-1 recently added in nightly in rustc version detection. (5b2847a)

portable-atomic-util 0.2.3

• Add new_uninit/new_uninit_slice/assume_init to Arc at Rust 1.36+. (align to the std Arc change in Rust 1.82) (362dc9a)

• Support make_mut on Arc<[T]> and Arc<str> at Rust 1.36+. (align to the std Arc change in Rust 1.81) (362dc9a)

1.9.0

• RISC-V without A-extension: Support RMW when Zaamo extension enabled (even when unsafe-assume-single-core disabled). (#185, 9983a8b)
  See "operations don't require disabling interrupts" list in interrupt module's readme for the operations provided.

• Support run-time detection of RISC-V Zacas extension (currently disabled by default). (#183)

• Support 128-bit atomics on Arm64EC (currently nightly-only) (#184)

• Improve compile-time detection of powerpc64 quadword-atomics. (3eb8507)