[flac-dev] SSE intrinsics disappearing from Clang 14+

[Martijn van Beurden]

Op zo 25 sep. 2022 om 23:55 schreef Christian Weisgerber <naddy at mips.inka.de
>:

> The checks for SSE*/AVX* intrinsics in include/private/cpu.h are
> suffering attrition with Clang 14 and newer.
>
> Clang 13: all are defined on x86: SSE, SSE2, SSSE3, SSE4.1, AVX, AVX2, FMA.
> Clang 14: SSSE3 and AVX disappear.
> Clang 15: only SSE and SSE2 are left, I'm told.
>
> The suggestion at...
>
> https://lists.freebsd.org/archives/freebsd-current/2022-September/002633.html
> ... is to check for _mm* intrinsics instead of __builtin_*.
>

Maybe at this point it is reasonable to just start assuming support? That
would mean dropping support (with default settings that is) on x86_64 for
all Clang that do not supply AVX/AVX2/FMA intrinsics? That is how it works
for GCC currently, intrinsics are supported for GCC 4.9 or later.
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