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rustc_data_structures: Explicitly check for 64-bit atomics support

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Instead of keeping a list of architectures which have native support
for 64-bit atomics, just use #[cfg(target_has_atomic = "64")] and its
inverted counterpart to determine whether we need to use portable
AtomicU64 on the target architecture.
This commit is contained in:
John Paul Adrian Glaubitz 2024-06-28 08:06:36 +02:00
parent 9c3bc805dd
commit ab1b48ef2a
3 changed files with 7 additions and 9 deletions
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2
compiler/rustc_data_structures/Cargo.toml
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@ -50,7 +50,7 @@ libc = "0.2"
memmap2 = "0.2.1"
# tidy-alphabetical-end
[target.'cfg(any(target_arch = "mips", target_arch = "powerpc", target_arch = "sparc"))'.dependencies]
[target.'cfg(not(target_has_atomic = "64"))'.dependencies]
portable-atomic = "1.5.1"
[features]

7
compiler/rustc_data_structures/src/marker.rs
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@ -147,14 +147,13 @@ macro_rules! already_sync {
[crate::owned_slice::OwnedSlice]
);
// MIPS, PowerPC and SPARC platforms with 32-bit pointers do not
// have AtomicU64 type.
#[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc", target_arch = "sparc")))]
// Use portable AtomicU64 for targets without native 64-bit atomics
#[cfg(target_has_atomic = "64")]
already_sync!(
[std::sync::atomic::AtomicU64]
);
#[cfg(any(target_arch = "mips", target_arch = "powerpc", target_arch = "sparc"))]
#[cfg(not(target_has_atomic = "64"))]
already_sync!(
[portable_atomic::AtomicU64]
);

7
compiler/rustc_data_structures/src/sync.rs
View File

@ -270,12 +270,11 @@ fn clone(&self) -> Self {
pub use std::sync::atomic::{AtomicBool, AtomicUsize, AtomicU32};
// MIPS, PowerPC and SPARC platforms with 32-bit pointers do not
// have AtomicU64 type.
#[cfg(not(any(target_arch = "mips", target_arch = "powerpc", target_arch = "sparc")))]
// Use portable AtomicU64 for targets without native 64-bit atomics
#[cfg(target_has_atomic = "64")]
pub use std::sync::atomic::AtomicU64;
#[cfg(any(target_arch = "mips", target_arch = "powerpc", target_arch = "sparc"))]
#[cfg(not(target_has_atomic = "64"))]
pub use portable_atomic::AtomicU64;
pub use std::sync::Arc as Lrc;