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author | Valentin Popov <valentin@popov.link> | 2024-07-19 15:37:58 +0300 |
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committer | Valentin Popov <valentin@popov.link> | 2024-07-19 15:37:58 +0300 |
commit | a990de90fe41456a23e58bd087d2f107d321f3a1 (patch) | |
tree | 15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/portable-atomic/src/imp/fallback/outline_atomics.rs | |
parent | 3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff) | |
download | fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip |
Deleted vendor folder
Diffstat (limited to 'vendor/portable-atomic/src/imp/fallback/outline_atomics.rs')
-rw-r--r-- | vendor/portable-atomic/src/imp/fallback/outline_atomics.rs | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/vendor/portable-atomic/src/imp/fallback/outline_atomics.rs b/vendor/portable-atomic/src/imp/fallback/outline_atomics.rs deleted file mode 100644 index 895b60c..0000000 --- a/vendor/portable-atomic/src/imp/fallback/outline_atomics.rs +++ /dev/null @@ -1,172 +0,0 @@ -// SPDX-License-Identifier: Apache-2.0 OR MIT - -// Helper for outline-atomics. -// -// On architectures where DW atomics are not supported on older CPUs, we use -// fallback implementation when DW atomic instructions are not supported and -// outline-atomics is enabled. -// -// This module provides helpers to implement them. - -use core::sync::atomic::Ordering; - -#[cfg(any(target_arch = "x86_64", target_arch = "powerpc64"))] -pub(crate) type Udw = u128; -#[cfg(any(target_arch = "x86_64", target_arch = "powerpc64"))] -pub(crate) type AtomicUdw = super::super::fallback::AtomicU128; -#[cfg(any(target_arch = "x86_64", target_arch = "powerpc64"))] -pub(crate) type AtomicIdw = super::super::fallback::AtomicI128; - -#[cfg(target_arch = "arm")] -pub(crate) type Udw = u64; -#[cfg(target_arch = "arm")] -pub(crate) type AtomicUdw = super::super::fallback::AtomicU64; -#[cfg(target_arch = "arm")] -pub(crate) type AtomicIdw = super::super::fallback::AtomicI64; - -// Asserts that the function is called in the correct context. -macro_rules! debug_assert_outline_atomics { - () => { - #[cfg(target_arch = "x86_64")] - { - debug_assert!(!super::detect::detect().has_cmpxchg16b()); - } - #[cfg(target_arch = "powerpc64")] - { - debug_assert!(!super::detect::detect().has_quadword_atomics()); - } - #[cfg(target_arch = "arm")] - { - debug_assert!(!super::has_kuser_cmpxchg64()); - } - }; -} - -#[cold] -pub(crate) unsafe fn atomic_load(src: *mut Udw, order: Ordering) -> Udw { - debug_assert_outline_atomics!(); - #[allow(clippy::cast_ptr_alignment)] - // SAFETY: the caller must uphold the safety contract. - unsafe { - (*(src as *const AtomicUdw)).load(order) - } -} -fn_alias! { - #[cold] - pub(crate) unsafe fn(src: *mut Udw) -> Udw; - // fallback's atomic load has at least acquire semantics. - #[cfg(not(any(target_arch = "arm", target_arch = "x86_64")))] - atomic_load_non_seqcst = atomic_load(Ordering::Acquire); - atomic_load_seqcst = atomic_load(Ordering::SeqCst); -} - -#[cold] -pub(crate) unsafe fn atomic_store(dst: *mut Udw, val: Udw, order: Ordering) { - debug_assert_outline_atomics!(); - #[allow(clippy::cast_ptr_alignment)] - // SAFETY: the caller must uphold the safety contract. - unsafe { - (*(dst as *const AtomicUdw)).store(val, order); - } -} -fn_alias! { - #[cold] - pub(crate) unsafe fn(dst: *mut Udw, val: Udw); - // fallback's atomic store has at least release semantics. - #[cfg(not(target_arch = "arm"))] - atomic_store_non_seqcst = atomic_store(Ordering::Release); - atomic_store_seqcst = atomic_store(Ordering::SeqCst); -} - -#[cold] -pub(crate) unsafe fn atomic_compare_exchange( - dst: *mut Udw, - old: Udw, - new: Udw, - success: Ordering, - failure: Ordering, -) -> (Udw, bool) { - debug_assert_outline_atomics!(); - #[allow(clippy::cast_ptr_alignment)] - // SAFETY: the caller must uphold the safety contract. - unsafe { - match (*(dst as *const AtomicUdw)).compare_exchange(old, new, success, failure) { - Ok(v) => (v, true), - Err(v) => (v, false), - } - } -} -fn_alias! { - #[cold] - pub(crate) unsafe fn(dst: *mut Udw, old: Udw, new: Udw) -> (Udw, bool); - // fallback's atomic CAS has at least AcqRel semantics. - #[cfg(not(any(target_arch = "arm", target_arch = "x86_64")))] - atomic_compare_exchange_non_seqcst - = atomic_compare_exchange(Ordering::AcqRel, Ordering::Acquire); - atomic_compare_exchange_seqcst - = atomic_compare_exchange(Ordering::SeqCst, Ordering::SeqCst); -} - -macro_rules! atomic_rmw_3 { - ( - $name:ident($atomic_type:ident::$method_name:ident), - $non_seqcst_alias:ident, $seqcst_alias:ident - ) => { - #[cold] - pub(crate) unsafe fn $name(dst: *mut Udw, val: Udw, order: Ordering) -> Udw { - debug_assert_outline_atomics!(); - #[allow(clippy::cast_ptr_alignment)] - // SAFETY: the caller must uphold the safety contract. - unsafe { - (*(dst as *const $atomic_type)).$method_name(val as _, order) as Udw - } - } - fn_alias! { - #[cold] - pub(crate) unsafe fn(dst: *mut Udw, val: Udw) -> Udw; - // fallback's atomic RMW has at least AcqRel semantics. - #[cfg(not(any(target_arch = "arm", target_arch = "x86_64")))] - $non_seqcst_alias = $name(Ordering::AcqRel); - $seqcst_alias = $name(Ordering::SeqCst); - } - }; -} -macro_rules! atomic_rmw_2 { - ( - $name:ident($atomic_type:ident::$method_name:ident), - $non_seqcst_alias:ident, $seqcst_alias:ident - ) => { - #[cold] - pub(crate) unsafe fn $name(dst: *mut Udw, order: Ordering) -> Udw { - debug_assert_outline_atomics!(); - #[allow(clippy::cast_ptr_alignment)] - // SAFETY: the caller must uphold the safety contract. - unsafe { - (*(dst as *const $atomic_type)).$method_name(order) as Udw - } - } - fn_alias! { - #[cold] - pub(crate) unsafe fn(dst: *mut Udw) -> Udw; - // fallback's atomic RMW has at least AcqRel semantics. - #[cfg(not(any(target_arch = "arm", target_arch = "x86_64")))] - $non_seqcst_alias = $name(Ordering::AcqRel); - $seqcst_alias = $name(Ordering::SeqCst); - } - }; -} - -atomic_rmw_3!(atomic_swap(AtomicUdw::swap), atomic_swap_non_seqcst, atomic_swap_seqcst); -atomic_rmw_3!(atomic_add(AtomicUdw::fetch_add), atomic_add_non_seqcst, atomic_add_seqcst); -atomic_rmw_3!(atomic_sub(AtomicUdw::fetch_sub), atomic_sub_non_seqcst, atomic_sub_seqcst); -atomic_rmw_3!(atomic_and(AtomicUdw::fetch_and), atomic_and_non_seqcst, atomic_and_seqcst); -atomic_rmw_3!(atomic_nand(AtomicUdw::fetch_nand), atomic_nand_non_seqcst, atomic_nand_seqcst); -atomic_rmw_3!(atomic_or(AtomicUdw::fetch_or), atomic_or_non_seqcst, atomic_or_seqcst); -atomic_rmw_3!(atomic_xor(AtomicUdw::fetch_xor), atomic_xor_non_seqcst, atomic_xor_seqcst); -atomic_rmw_3!(atomic_max(AtomicIdw::fetch_max), atomic_max_non_seqcst, atomic_max_seqcst); -atomic_rmw_3!(atomic_umax(AtomicUdw::fetch_max), atomic_umax_non_seqcst, atomic_umax_seqcst); -atomic_rmw_3!(atomic_min(AtomicIdw::fetch_min), atomic_min_non_seqcst, atomic_min_seqcst); -atomic_rmw_3!(atomic_umin(AtomicUdw::fetch_min), atomic_umin_non_seqcst, atomic_umin_seqcst); - -atomic_rmw_2!(atomic_not(AtomicUdw::fetch_not), atomic_not_non_seqcst, atomic_not_seqcst); -atomic_rmw_2!(atomic_neg(AtomicUdw::fetch_neg), atomic_neg_non_seqcst, atomic_neg_seqcst); |