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)

1.8.0

• Improve diagnostics when method that requires CAS is unavailable. (#181)

  Before:

  error[E0599]: no method named `compare_exchange` found for struct `portable_atomic::AtomicUsize` in the current scope
    --> src/race.rs:60:24
     |
  60 |             self.inner.compare_exchange(0, value.get(), Ordering::AcqRel, Ordering::Acquire);
     |                        ^^^^^^^^^^^^^^^^ method not found in `AtomicUsize`
  

  After:

  error[E0277]: `compare_exchange` requires atomic CAS but not available on this target by default
      --> src/race.rs:60:24
       |
  60   |             self.inner.compare_exchange(0, value.get(), Ordering::AcqRel, Ordering::Acquire);
       |                        ^^^^^^^^^^^^^^^^ this associated function is not available on this target by default
       |
       = help: the trait `HasCompareExchange` is not implemented for `&portable_atomic::AtomicUsize`
       = note: consider enabling one of the `unsafe-assume-single-core` or `critical-section` Cargo features
       = note: see <https://docs.rs/portable-atomic/latest/portable_atomic/#optional-features> for more.
  

• Improve compile error messages for some other cases (19716ac, 61dcaaa)

• Various improvements to RISC-V.

  • riscv64: Support 128-bit atomics when Zacas extension enabled. (173) This is currently marked as experimental because LLVM marking the corresponding target feature as experimental.
  • riscv32: Support 64-bit atomics when Zacas extension enabled. (173) This is currently marked as experimental because LLVM marking the corresponding target feature as experimental.
  • Improvements for RISC-V without A-extension:
    • Support zaamo target feature. When building for single-core RISC-V without A-extension, this is equivalent to force-amo feature (8abba4b)
    • Support zabha target feature. (694364a)
    • Strengthen SeqCst store to improve compatibility with code that uses atomic instruction mapping that differs from LLVM and GCC. (5b10b15)

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

  • aarch64: Support run-time detection of FEAT_LRCPC3/FEAT_LSE128 for load/store. (#174)
  • aarch64: Support run-time detection of FEAT_LSE2 on OpenBSD. (4f8c735)
  • aarch64: Support run-time detection of FEAT_LSE/FEAT_LSE2 on illumos (currently disabled by default because illumos AArch64 port is experimental). (#175)
  • powerpc64: Support run-time detection on OpenBSD 7.6+ (currently disabled by default for compatibility with old versions). (09a967b)

• aarch64: Support FEAT_LRCPC3/FEAT_LSE128 with pre-16 LLVM. (#178)

• aarch64: Improve compile-time detection of FEAT_LSE2/FEAT_LRCPC3/FEAT_LSE128. (10d47de)

• Relax minimal version of serde (supported via optional feature) to 1.0.60.

1.7.0

• Support run-time detection for cmpxchg16b on x86_64 on pre-1.69 rustc. (#154)

• Make into_inner const fn on Rust 1.56+. (align to the std atomic change in Rust 1.79) (dee1f89)

• Work around rustc_codegen_gcc bug on x86_64. (d938f77)

• Optimize x86_64 atomics.

  • Optimize 128-bit load/store on Zhaoxin CPU with AVX. (86cee8f)
  • Optimize 128-bit SeqCst store on Intel/AMD/Zhaoxin CPU with AVX. (#156, 0483042)
  • Remove needless test in CAS. (573e025)

• Make rustc version detection robust for custom toolchains. (f8ea85e)

• Respect RUSTC_WRAPPER in rustc version detection.

• Our build script is now less likely to be re-run unnecessarily in versions where the cargo bug fix is available (cargo 1.79+). (52c277b)

portable-atomic-util 0.2.2

• Fix build issue with esp toolchain. (f8ea85e)