Christian Weisgerber
2022-Sep-25 21:52 UTC
[flac-dev] SSE intrinsics disappearing from Clang 14+
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_*. -- Christian "naddy" Weisgerber naddy at mips.inka.de
Martijn van Beurden
2022-Sep-26 05:26 UTC
[flac-dev] SSE intrinsics disappearing from Clang 14+
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. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.xiph.org/pipermail/flac-dev/attachments/20220926/2c44bd04/attachment.htm>