Skip to content

[zerocopy] Re-enable big endian aarch64 types #3073

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
joshlf merged 1 commit into from
Mar 28, 2026
+50 −4
Merged

[zerocopy] Re-enable big endian aarch64 types #3073

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
27 changes: 27 additions & 0 deletions .github/workflows/ci.yml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,7 @@ jobs:
"no-zerocopy-generic-bounds-in-const-fn-1-61-0",
"no-zerocopy-target-has-atomics-1-60-0",
"no-zerocopy-aarch64-simd-1-59-0",
"no-zerocopy-aarch64-simd-be-1-87-0",
"no-zerocopy-panic-in-const-and-vec-try-reserve-1-57-0"
]
target: [
Expand Down Expand Up @@ -104,6 +105,8 @@ jobs:
features: "--all-features"
- toolchain: "no-zerocopy-aarch64-simd-1-59-0"
features: "--all-features"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
features: "--all-features"
- toolchain: "no-zerocopy-panic-in-const-and-vec-try-reserve-1-57-0"
features: "--all-features"
# Exclude any combination for the zerocopy-derive crate which
Expand All @@ -130,6 +133,8 @@ jobs:
toolchain: "no-zerocopy-target-has-atomics-1-60-0"
- crate: "zerocopy-derive"
toolchain: "no-zerocopy-aarch64-simd-1-59-0"
- crate: "zerocopy-derive"
toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
- crate: "zerocopy-derive"
toolchain: "no-zerocopy-panic-in-const-and-vec-try-reserve-1-57-0"
# Exclude stable/wasm since wasm is no longer provided via rustup on
Expand Down Expand Up @@ -158,6 +163,28 @@ jobs:
target: "thumbv6m-none-eabi"
- toolchain: "no-zerocopy-aarch64-simd-1-59-0"
target: "wasm32-unknown-unknown"
# Exclude non-aarch64 targets from the `no-zerocopy-aarch64-simd-be-1-87-0`
# toolchain.
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "i686-unknown-linux-gnu"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "x86_64-unknown-linux-gnu"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "arm-unknown-linux-gnueabi"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "powerpc-unknown-linux-gnu"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "powerpc64-unknown-linux-gnu"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "riscv64gc-unknown-linux-gnu"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "s390x-unknown-linux-gnu"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "x86_64-pc-windows-msvc"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "thumbv6m-none-eabi"
- toolchain: "no-zerocopy-aarch64-simd-be-1-87-0"
target: "wasm32-unknown-unknown"
# Exclude most targets from the `no-zerocopy-core-error-1-81-0`
# toolchain since the `no-zerocopy-core-error-1-81-0` feature is unrelated to
# compilation target. This only leaves i686 and x86_64 targets.
Expand Down
5 changes: 5 additions & 0 deletions Cargo.toml
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,11 @@ no-zerocopy-target-has-atomics-1-60-0 = "1.60.0"
# versions, these types require the "simd-nightly" feature.
no-zerocopy-aarch64-simd-1-59-0 = "1.59.0"

# Include SIMD types from `core::arch::aarch64` on big endian targets. Prior to
# 1.87.0 (https://github.com/rust-lang/rust/pull/136831) the types were only
# correct on little endian and backed off from stable in a breaking change.
no-zerocopy-aarch64-simd-be-1-87-0 = "1.87.0"

# Permit panicking in `const fn`s and calling `Vec::try_reserve`.
no-zerocopy-panic-in-const-and-vec-try-reserve-1-57-0 = "1.57.0"

Expand Down
22 changes: 18 additions & 4 deletions src/impls.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1350,12 +1350,26 @@ mod simd {
#[cfg(all(feature = "simd-nightly", target_arch = "powerpc64"))]
powerpc64, powerpc64, vector_bool_long, vector_double, vector_signed_long, vector_unsigned_long
);
// NOTE: NEON intrinsics were broken on big-endian platforms from their stabilization up to
// Rust 1.87. (Context in https://github.com/rust-lang/stdarch/issues/1484). Support is
// split in two different version ranges on top of the base configuration, requiring either
// little endian or the more recent version to be detected as well.
#[cfg(not(no_zerocopy_aarch64_simd_1_59_0))]
simd_arch_mod!(
// NOTE(https://github.com/rust-lang/stdarch/issues/1484): NEON intrinsics are currently
// broken on big-endian platforms.
#[cfg(all(target_arch = "aarch64", target_endian = "little"))]
#[cfg_attr(doc_cfg, doc(cfg(rust = "1.59.0")))]
#[cfg(all(
target_arch = "aarch64",
any(
target_endian = "little",
not(no_zerocopy_aarch64_simd_be_1_87_0)
)
))]
#[cfg_attr(
doc_cfg,
doc(cfg(all(target_arch = "aarch64", any(
all(rust = "1.59.0", target_endian = "little"),
rust = "1.87.0",
))))
)]
aarch64, aarch64, float32x2_t, float32x4_t, float64x1_t, float64x2_t, int8x8_t, int8x8x2_t,
int8x8x3_t, int8x8x4_t, int8x16_t, int8x16x2_t, int8x16x3_t, int8x16x4_t, int16x4_t,
int16x8_t, int32x2_t, int32x4_t, int64x1_t, int64x2_t, poly8x8_t, poly8x8x2_t, poly8x8x3_t,
Expand Down
Loading