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Merged
taiki-e merged 2 commits into from
Sep 5, 2025
Merged

Bump MSRV to 1.74 & Drop const_new and arch_legacy #48

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350eeda
Bump MSRV to 1.61 & Drop const_new
taiki-e Sep 5, 2025
ad63fcd
Bump MSRV to 1.74 & Drop arch_legacy
taiki-e Sep 5, 2025
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11 changes: 0 additions & 11 deletions .github/.cspell/project-dictionary.txt
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Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
addi
amocas
amoswap
amswap
Expand Down Expand Up @@ -38,13 +37,11 @@ isync
kuser
LAAL
lclang
ldapr
ldar
ldarx
ldaxp
ldclrp
ldiapp
ldrd
ldrex
ldrexd
ldsetp
Expand All @@ -70,12 +67,9 @@ memw
mfcr
mfence
mgba
movd
movi
movlps
movq
movsd
movss
mspdebug
msync
muldi
Expand All @@ -84,7 +78,6 @@ nostartfiles
opensbi
orrs
partword
pshufd
pstq
qbsp
quadword
Expand All @@ -99,13 +92,11 @@ SCWP
SCWPE
seqz
sete
shufps
signedness
simavr
simio
slli
sllv
sltui
srai
sreg
srlv
Expand All @@ -115,7 +106,6 @@ stilp
stlxp
stpq
stqcx
strd
strex
strexd
stwcx
Expand All @@ -136,7 +126,6 @@ xadd
xchg
xmegau
xmmword
xorps
zaamo
zabha
zacas
Expand Down
55 changes: 9 additions & 46 deletions .github/workflows/ci.yml
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Expand Up @@ -56,8 +56,6 @@ jobs:
include:
# ------------------------------------------------------------
# x86_64-unknown-linux-gnu
- rust: '1.59' # LLVM 13
target: x86_64-unknown-linux-gnu
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: x86_64-unknown-linux-gnu
# - rust: '1.81' # LLVM 18
Expand Down Expand Up @@ -89,9 +87,6 @@ jobs:
os: windows-latest
# ------------------------------------------------------------
# aarch64-unknown-linux-gnu
- rust: '1.59' # LLVM 13
target: aarch64-unknown-linux-gnu
os: ubuntu-24.04-arm
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: aarch64-unknown-linux-gnu
os: ubuntu-24.04-arm
Expand Down Expand Up @@ -120,9 +115,6 @@ jobs:
# flags: -Z codegen-backend=cranelift
# ------------------------------------------------------------
# aarch64-apple-darwin
- rust: '1.59' # LLVM 13
target: aarch64-apple-darwin
os: macos-latest
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: aarch64-apple-darwin
os: macos-latest
Expand All @@ -148,8 +140,6 @@ jobs:
os: windows-11-arm
# ------------------------------------------------------------
# aarch64_be-unknown-linux-gnu
- rust: nightly-2021-12-16 # Rust 1.59, LLVM 13 (oldest version we can use stable asm on this target)
target: aarch64_be-unknown-linux-gnu
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
target: aarch64_be-unknown-linux-gnu
# - rust: nightly-2024-07-31 # Rust 1.82, LLVM 18
Expand All @@ -175,8 +165,6 @@ jobs:
os: windows-11-arm
# ------------------------------------------------------------
# armv5te-unknown-linux-gnueabi
- rust: '1.59' # LLVM 13
target: armv5te-unknown-linux-gnueabi
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: armv5te-unknown-linux-gnueabi
# - rust: '1.81' # LLVM 18
Expand All @@ -191,8 +179,6 @@ jobs:
target: armv5te-unknown-linux-gnueabi
# ------------------------------------------------------------
# arm-unknown-linux-gnueabi
- rust: '1.59' # LLVM 13
target: arm-unknown-linux-gnueabi
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: arm-unknown-linux-gnueabi
# - rust: '1.81' # LLVM 18
Expand All @@ -208,8 +194,6 @@ jobs:
target: arm-unknown-linux-gnueabi
# ------------------------------------------------------------
# armv7-unknown-linux-gnueabi
- rust: '1.59' # LLVM 13
target: armv7-unknown-linux-gnueabi
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: armv7-unknown-linux-gnueabi
# - rust: '1.81' # LLVM 18
Expand All @@ -225,9 +209,6 @@ jobs:
target: armv7-unknown-linux-gnueabi
# ------------------------------------------------------------
# armv7-unknown-linux-gnueabihf
- rust: '1.59' # LLVM 13
target: armv7-unknown-linux-gnueabihf
os: ubuntu-24.04-arm
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: armv7-unknown-linux-gnueabihf
os: ubuntu-24.04-arm
Expand All @@ -251,9 +232,6 @@ jobs:
os: ubuntu-latest # QEMU on x86_64
# ------------------------------------------------------------
# armeb-unknown-linux-gnueabi
- rust: nightly-2022-09-16 # Rust 1.65, LLVM 15 (version that this target was added)
target: armeb-unknown-linux-gnueabi
os: ubuntu-22.04
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
target: armeb-unknown-linux-gnueabi
os: ubuntu-22.04
Expand All @@ -268,8 +246,6 @@ jobs:
os: ubuntu-22.04
# ------------------------------------------------------------
# i586-unknown-linux-gnu
- rust: '1.59' # LLVM 13
target: i586-unknown-linux-gnu
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: i586-unknown-linux-gnu
# - rust: '1.81' # LLVM 18
Expand All @@ -284,8 +260,6 @@ jobs:
target: i586-unknown-linux-gnu
# ------------------------------------------------------------
# i686-unknown-linux-gnu
- rust: '1.59' # LLVM 13
target: i686-unknown-linux-gnu
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: i686-unknown-linux-gnu
# - rust: '1.81' # LLVM 18
Expand All @@ -306,8 +280,6 @@ jobs:
target: hexagon-unknown-linux-musl
# ------------------------------------------------------------
# loongarch64-unknown-linux-gnu
- rust: '1.72' # LLVM 16 (inline asm for loongarch64 has been stabilized in Rust 1.72)
target: loongarch64-unknown-linux-gnu
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: loongarch64-unknown-linux-gnu
# - rust: '1.81' # LLVM 18
Expand All @@ -323,7 +295,7 @@ jobs:
target: loongarch64-unknown-linux-gnu
# ------------------------------------------------------------
# mips-unknown-linux-gnu
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version we can use asm_experimental_arch on this target)
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
target: mips-unknown-linux-gnu
# - rust: nightly-2024-07-31 # Rust 1.82, LLVM 18
# target: mips-unknown-linux-gnu
Expand All @@ -333,7 +305,7 @@ jobs:
target: mips-unknown-linux-gnu
# ------------------------------------------------------------
# mipsel-unknown-linux-gnu
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version we can use asm_experimental_arch on this target)
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
target: mipsel-unknown-linux-gnu
# - rust: nightly-2024-07-31 # Rust 1.82, LLVM 18
# target: mipsel-unknown-linux-gnu
Expand All @@ -343,7 +315,7 @@ jobs:
target: mipsel-unknown-linux-gnu
# ------------------------------------------------------------
# mips64-unknown-linux-gnuabi64
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version we can use asm_experimental_arch on this target)
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
target: mips64-unknown-linux-gnuabi64
# - rust: nightly-2024-07-31 # Rust 1.82, LLVM 18
# target: mips64-unknown-linux-gnuabi64
Expand All @@ -353,7 +325,7 @@ jobs:
target: mips64-unknown-linux-gnuabi64
# ------------------------------------------------------------
# mips64el-unknown-linux-gnuabi64
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version we can use asm_experimental_arch on this target)
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
target: mips64el-unknown-linux-gnuabi64
# - rust: nightly-2024-07-31 # Rust 1.82, LLVM 18
# target: mips64el-unknown-linux-gnuabi64
Expand Down Expand Up @@ -403,7 +375,7 @@ jobs:
target: mipsisa64r6el-unknown-linux-gnuabi64
# ------------------------------------------------------------
# powerpc-unknown-linux-gnu
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version we can use asm_experimental_arch on this target)
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
target: powerpc-unknown-linux-gnu
# - rust: nightly-2024-07-31 # Rust 1.82, LLVM 18
# target: powerpc-unknown-linux-gnu
Expand All @@ -413,7 +385,7 @@ jobs:
target: powerpc-unknown-linux-gnu
# ------------------------------------------------------------
# powerpc64-unknown-linux-gnu
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version we can use asm_experimental_arch on this target)
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
target: powerpc64-unknown-linux-gnu
# - rust: nightly-2024-07-31 # Rust 1.82, LLVM 18
# target: powerpc64-unknown-linux-gnu
Expand All @@ -423,7 +395,7 @@ jobs:
target: powerpc64-unknown-linux-gnu
# ------------------------------------------------------------
# powerpc64le-unknown-linux-gnu
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version we can use asm_experimental_arch on this target)
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
target: powerpc64le-unknown-linux-gnu
# - rust: nightly-2024-07-31 # Rust 1.82, LLVM 18
# target: powerpc64le-unknown-linux-gnu
Expand All @@ -443,8 +415,6 @@ jobs:
target: riscv32gc-unknown-linux-gnu
# ------------------------------------------------------------
# riscv64gc-unknown-linux-gnu
- rust: '1.59' # LLVM 13
target: riscv64gc-unknown-linux-gnu
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: riscv64gc-unknown-linux-gnu
# - rust: '1.81' # LLVM 18
Expand Down Expand Up @@ -483,9 +453,6 @@ jobs:
target: sparc64-unknown-linux-gnu
# ------------------------------------------------------------
# thumbv7neon-unknown-linux-gnueabihf
- rust: '1.59' # LLVM 13
target: thumbv7neon-unknown-linux-gnueabihf
os: ubuntu-24.04-arm
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
target: thumbv7neon-unknown-linux-gnueabihf
os: ubuntu-24.04-arm
Expand Down Expand Up @@ -676,8 +643,6 @@ jobs:

- run: cargo minimal-versions build --workspace --no-private --detach-path-deps=skip-exact --all-features ${TARGET:-} ${BUILD_STD:-} ${RELEASE:-}
- run: cargo minimal-versions build --workspace --no-private --detach-path-deps=skip-exact --all-features ${TARGET:-} ${BUILD_STD:-} ${RELEASE:-} --direct
# -Z direct-minimal-versions requires Cargo 1.70.
if: (!(startsWith(matrix.rust, '1.5') || startsWith(matrix.rust, '1.6') || startsWith(matrix.rust, 'nightly-2021') || startsWith(matrix.rust, 'nightly-2022') || startsWith(matrix.rust, 'nightly-2023')))

build:
needs: tidy
Expand All @@ -686,12 +651,10 @@ jobs:
fail-fast: false
matrix:
include:
- rust: '1.59'
- rust: '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
- rust: stable
- rust: beta
- rust: nightly-2023-08-23 # The last nightly version that doesn't support MaybeUninit registers.
- rust: nightly-2023-08-24 # The oldest nightly version that supports MaybeUninit registers: https://github.com/rust-lang/rust/pull/114790
- rust: nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
- rust: nightly
# Check that test suite can be built
- name: nightly, --tests
Expand All @@ -715,7 +678,7 @@ jobs:
fail-fast: false
matrix:
rust:
- '1.64' # LLVM 14
- '1.74' # LLVM 17 (oldest version that MaybeUninit register is supported)
- stable
# - beta
- nightly-2023-08-24 # Rust 1.74, LLVM 17 (oldest version that MaybeUninit register is supported)
Expand Down
6 changes: 6 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -12,6 +12,12 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com

## [Unreleased]

- Increase the minimum supported Rust version (MSRV) from Rust 1.59 to Rust 1.74.

- Remove `AtomicMaybeUninit::const_new` because `AtomicMaybeUninit::new` is now always `const fn` because of the MSRV bump.

- Remove legacy [inefficient](https://github.com/crossbeam-rs/crossbeam/pull/1015#issuecomment-1676549870) implementation for pre-1.74 Rust which doesn't support `MaybeUninit` registers in `asm!`.

## [0.3.9] - 2025-09-05

- Update to stabilized [LoongArch32](https://github.com/rust-lang/rust/pull/144402) inline assembly. ([803b062](https://github.com/taiki-e/atomic-maybe-uninit/commit/803b06263c8a3e38596eb48aec88d2dce77d60e6))
Expand Down
9 changes: 4 additions & 5 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
name = "atomic-maybe-uninit"
version = "0.3.9" #publish:version
edition = "2021"
rust-version = "1.59" # For asm!
rust-version = "1.74" # For MaybeUninit registers in asm!: https://github.com/rust-lang/rust/pull/114790
license = "Apache-2.0 OR MIT"
repository = "https://github.com/taiki-e/atomic-maybe-uninit"
keywords = ["atomic"]
Expand Down Expand Up @@ -30,14 +30,13 @@ allowed_external_types = [
doc-scrape-examples = false

[dev-dependencies]
build-context = "0.1"
crossbeam-utils = { version = "0.8", git = "https://github.com/crossbeam-rs/crossbeam.git", rev = "17fb841" } # The latest released crossbeam-utils requires Rust 1.60
crossbeam-utils = "0.8"
fastrand = "2"
paste = "1"
quickcheck = { version = "1", default-features = false, git = "https://github.com/taiki-e/quickcheck.git", rev = "83b1d59" } # https://github.com/BurntSushi/quickcheck/pull/304 + https://github.com/BurntSushi/quickcheck/pull/282 + https://github.com/BurntSushi/quickcheck/pull/296 + f16/f128 support + lower MSRV

[target.'cfg(unix)'.dev-dependencies]
libc = "=0.2.163" # newer libc requires Rust 1.63
libc = "0.2"

[lints]
workspace = true
Expand Down Expand Up @@ -96,7 +95,7 @@ unexpected_cfgs = { level = "warn", check-cfg = [
] }
unnameable_types = "warn"
unreachable_pub = "warn"
# unsafe_op_in_unsafe_fn = "warn" # Set at crate-level instead since https://github.com/rust-lang/rust/pull/100081 merged in Rust 1.65 is not available on MSRV
unsafe_op_in_unsafe_fn = "warn"
[workspace.lints.clippy]
all = "warn" # Downgrade deny-by-default lints
pedantic = "warn"
Expand Down
15 changes: 7 additions & 8 deletions README.md
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Expand Up @@ -3,7 +3,7 @@
[![crates.io](https://img.shields.io/crates/v/atomic-maybe-uninit?style=flat-square&logo=rust)](https://crates.io/crates/atomic-maybe-uninit)
[![docs.rs](https://img.shields.io/badge/docs.rs-atomic--maybe--uninit-blue?style=flat-square&logo=docs.rs)](https://docs.rs/atomic-maybe-uninit)
[![license](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue?style=flat-square)](#license)
[![msrv](https://img.shields.io/badge/msrv-1.59-blue?style=flat-square&logo=rust)](https://www.rust-lang.org)
[![msrv](https://img.shields.io/badge/msrv-1.74-blue?style=flat-square&logo=rust)](https://www.rust-lang.org)
[![github actions](https://img.shields.io/github/actions/workflow/status/taiki-e/atomic-maybe-uninit/ci.yml?branch=main&style=flat-square&logo=github)](https://github.com/taiki-e/atomic-maybe-uninit/actions)

<!-- tidy:sync-markdown-to-rustdoc:start:src/lib.rs -->
Expand Down Expand Up @@ -32,10 +32,10 @@ Currently, x86, x86_64, Arm, AArch64, RISC-V, LoongArch, Arm64EC, s390x, MIPS, P
| riscv32 (+zacas) \[4] | i64,u64 | ✓ | ✓ |
| riscv64 | isize,usize,i8,u8,i16,u16,i32,u32,i64,u64 | ✓ | ✓\[1] |
| riscv64 (+zacas) \[4] | i128,u128 | ✓ | ✓ |
| loongarch64 \[7] | isize,usize,i8,u8,i16,u16,i32,u32,i64,u64 | ✓ | ✓ |
| loongarch32 \[10] (experimental) | isize,usize,i8,u8,i16,u16,i32,u32 | ✓ | ✓ |
| arm64ec \[8] | isize,usize,i8,u8,i16,u16,i32,u32,i64,u64,i128,u128 | ✓ | ✓ |
| s390x \[8] | isize,usize,i8,u8,i16,u16,i32,u32,i64,u64,i128,u128 | ✓ | ✓ |
| loongarch64 | isize,usize,i8,u8,i16,u16,i32,u32,i64,u64 | ✓ | ✓ |
| loongarch32 \[8] (experimental) | isize,usize,i8,u8,i16,u16,i32,u32 | ✓ | ✓ |
| arm64ec \[7] | isize,usize,i8,u8,i16,u16,i32,u32,i64,u64,i128,u128 | ✓ | ✓ |
| s390x \[7] | isize,usize,i8,u8,i16,u16,i32,u32,i64,u64,i128,u128 | ✓ | ✓ |
| mips / mips32r6 \[9] | isize,usize,i8,u8,i16,u16,i32,u32 | ✓ | ✓ |
| mips64 / mips64r6 \[9] | isize,usize,i8,u8,i16,u16,i32,u32,i64,u64 | ✓ | ✓ |
| powerpc \[9] | isize,usize,i8,u8,i16,u16,i32,u32 | ✓ | ✓ |
Expand All @@ -55,9 +55,8 @@ Currently, x86, x86_64, Arm, AArch64, RISC-V, LoongArch, Arm64EC, s390x, MIPS, P
\[4] Requires `zacas` target feature.<br>
\[5] Requires `quadword-atomics` target feature (enabled by default on powerpc64le).<br>
\[6] Requires `v9` or `leoncasa` target feature (enabled by default on Linux).<br>
\[7] Requires Rust 1.72+.<br>
\[8] Requires Rust 1.84+.<br>
\[10] Requires Rust 1.91+.<br>
\[7] Requires Rust 1.84+.<br>
\[8] Requires Rust 1.91+.<br>
\[9] Requires nightly due to `#![feature(asm_experimental_arch)]`.<br>

See also [Atomic operation overview by architecture](https://github.com/taiki-e/atomic-maybe-uninit/blob/HEAD/src/arch/README.md) for more information about atomic operations in these architectures.
Expand Down
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