Warner Losh 43c0054405 aarch64: use __ARM_NEON instead of __aarch64__ to control use of neon
There are compilation environments in aarch64 where NEON isn't
available. While these environments could define ZSTD_NO_INTRINSICS,
it's more fail-safe to use the more specific symbol to know if NEON
extensions are available.

__ARM_NEON is the proper symbol, defined in ARM C Language Extensions
Release 2.1 (https://developer.arm.com/documentation/ihi0053/d/). Some
sources suggest __ARM_NEON__, but that's the obsolete spelling from
prior versions of the standard.

Signed-off-by: Warner Losh <imp@bsdimp.com>
2020-10-13 12:12:46 -06:00
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