atomic-maybe-uninit

Support Arm64EC (experimental). (4d94b3c)

Support swap/CAS on AVR (experimental). (71b9a5f)

Make into_inner const fn on Rust 1.61+. (align to the std atomic change in Rust 1.79) (9c253dc)

Improve loongarch64 support. (358360c)

Make rustc version detection robust for custom toolchains. (c034611)

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+). (91ec716)

Various optimizations

• Optimize x86_32 64-bit load/store when SSE is not available. (75ca334)
• Optimize PowerPC32 Acquire/SeqCst load. (f5ce83b)
• Optimize x86 inline assembly. (adaf3a9, 3ba37e9, fcc0bf8)
• Optimize s390x inline assembly. (9ee7f57)

Add as_ptr and from_ptr.

Optimize weak CAS on PowerPC.

Optimize {8,16}-bit CAS on AArch64.

Add cfg_{has,no}_atomic_{8,16,32,64,128,ptr} macros to enable code when the corresponding atomic implementation is available/unavailable. (#9)

Add cfg_{has,no}_atomic_cas macros to enable code when atomic swap/CAS implementation is available/unavailable. (#9)

Documentation improvements. (#17, #18, thanks @RalfJung)

Fix AVR 16-bit atomic load/store.

Optimize AArch64 128-bit atomic store/swap when the lse128 target feature is enabled at compile-time.

Optimize AArch64 128-bit atomic load/store when the rcpc3 target feature is enabled at compile-time.

Support pre-v6 ARM Linux/Android (e.g., armv5te-unknown-linux-gnueabi, arm-linux-androideabi, etc.).

Support Hexagon (experimental).

Support AVR atomic load/store (experimental).

Improve {8,16}-bit atomic implementations on RISC-V, PowerPC, MIPS, s390x, LoongArch64.

Support LoongArch64.

Fix build error on MIPS32r6 and MIPS64r6 (both tier 3) since nightly-2023-07-19's target_arch change.

Fix build error on big endian ARMv8 AArch32 (tier 3).

Acknowledge all x86_64 Apple targets support 128-bit atomics.

Our code already recognizes this via cfg(target_feature), so this only affects users using pre-1.69 stable rustc.

See also rust-lang/rust#112150.

Optimize inline assemblies.

Fix build error on aarch64 ILP32 ABI targets (tier 3).

Optimize inline assemblies on PowerPC and s390x.

Fix bug in s390x atomic RMWs on old nightly.

Optimize inline assemblies on RISC-V, PowerPC, s390x, and MSP430.

Support 64-bit atomics on ARMv7-R and ARMv8-R.

Fix bug in AArch64 16-bit compare_exchange_weak.

Fix bug in AArch64 128-bit SeqCst load when FEAT_LSE2 is enabled at compile-time.

Optimize AArch64 atomic load when the rcpc target feature is enabled at compile-time.

Optimize PowerPC/PowerPC64 atomic RMWs.

Improve support for ARMv8 AArch32.

Optimize inline assemblies on x86.

Documentation improvements.

Support MSP430 atomic load/store.

Use track_caller when debug assertions are enabled.

Add compare_exchange, compare_exchange_weak, and fetch_update. (#7)

Support x86_64 128-bit atomics when the cmpxchg16b target feature is enabled at compile-time.

Support x86 64-bit atomics.

Fix bug in powerpc64 128-bit atomics.

Documentation improvements.

Support PowerPC.

Support s390x.

Implement RISC-V 8-bit and 16-bit swap.

Implement MIPS32r2 8-bit and 16-bit swap.

Implement MIPS64r2 8-bit and 16-bit swap.