Disable AES-Neon in big-endian ARM due to rust-lang/stdarch#1484

README.md

@@ -13,16 +13,16 @@ implementations, among which it automatically decides the best (most performant)
 - AES-NI (with Vector AES for 2-blocks) => requires a Nightly Compiler, the `nightly` feature to be enabled, and
   compiling for x86(64) with the `vaes` target_feature flag set.
 - AES-NI => requires compiling for x86(64) with the `sse4.1` and `aes` target_feature flags set.
-- AES-Neon => requires compiling for AArch64 or ARM64EC or ARM-v8 with the `aes` target_feature flag set (ARM-v8
-  requires a Nightly compiler and the `nightly` feature to be enabled) .
+- AES-Neon => requires compiling for little-endian AArch64 or ARM64EC or ARM-v8 with the `aes` target_feature flag set (
+  ARM-v8 requires a Nightly compiler and the `nightly` feature to be enabled).
 - AES-RV => Requires a Nightly compiler, the `nightly` feature to be enabled and compiling for RISC-V RV64 or RV32 with
   the `zkne` and `zknd` target-features enabled (performance considerably improves with the `unaligned-scalar-mem`
   target-feature enabled)
 - Software AES => fallback implementation based on Rijmen and Daemen's `optimized` implementation (available
-  on [their website](https://web.archive.org/web/20050828204927/http://www.iaik.tu-graz.ac.at/research/krypto/AES/old/%7Erijmen/rijndael/))
-- Constant-time Software AES => Much slower than Software AES, but is constant-time, which can be important in some scenarios.
-  Enabled by the `constant-time` feature. It is worth noting that all the accelerated AES implementations are constant-time, so this
-  only comes into play when no accelerated version is found.
+  on [their website](https://web.archive.org/web/20050828204927/http://www.iaik.tu-graz.ac.at/research/krypto/AES/old/%7Erijmen/rijndael/)).
+- Constant-time Software AES => Much slower than Software AES, but is constant-time, which can be important in some
+  scenarios. Enabled by the `constant-time` feature. It is worth noting that all the accelerated AES implementations are
+  constant-time, so this only comes into play when no accelerated version is found.
 
 If you are unsure about the target_feature flags to set, use `target_cpu=native` (if not cross-compiling) in
 the `RUSTFLAGS` environment variable, and use the `nightly` feature only if you are using a nightly compiler.

src/lib.rs

@@ -13,7 +13,8 @@
         feature = "nightly",
         target_arch = "arm",
         target_feature = "v8",
-        target_feature = "aes"
+        target_feature = "aes",
+        target_endian = "little" // https://github.com/rust-lang/stdarch/issues/1484
     ),
     feature(stdarch_arm_neon_intrinsics)
 )]
@@ -55,7 +56,8 @@ cfg_if! {
             target_arch = "arm64ec",
             all(feature = "nightly", target_arch = "arm", target_feature = "v8")
         ),
-        target_feature = "aes"
+        target_feature = "aes",
+        target_endian = "little" // https://github.com/rust-lang/stdarch/issues/1484
     ))] {
         mod aes_arm;
         pub use aes_arm::AesBlock;