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MDEV-33817 fixup: Disable for macOS

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According to https://discussions.apple.com/thread/8256853
an attempt to use AVX512 registers on macOS will result in #UD
(crash at runtime).

Also, starting with clang-18 and GCC 14, we must add "evex512" to the
target flags so that AVX and SSE instructions can use AVX512 specific
encodings. This flag was introduced together with the avx10.1-512 target.
Older compiler versions do not recognize "evex512". We do not want to
write "avx10.1-512" because it could enable some AVX512 subfeatures
that we do not have any CPUID check for.

Reviewed by: Vladislav Vaintroub
Tested on macOS by: Valerii Kravchuk
This commit is contained in:
Marko Mäkelä 2024-05-21 16:45:07 +03:00
parent 310fd6ff69
commit 266495b93e
1 changed files with 5 additions and 1 deletions
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6
mysys/crc32/crc32c_x86.cc
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@ -24,7 +24,11 @@
# endif
#else
# include <cpuid.h>
# if __GNUC__ >= 11 || (defined __clang_major__ && __clang_major__ >= 8)
# ifdef __APPLE__ /* AVX512 states are not enabled in XCR0 */
# elif __GNUC__ >= 14 || (defined __clang_major__ && __clang_major__ >= 18)
# define TARGET "pclmul,evex512,avx512f,avx512dq,avx512bw,avx512vl,vpclmulqdq"
# define USE_VPCLMULQDQ __attribute__((target(TARGET)))
# elif __GNUC__ >= 11 || (defined __clang_major__ && __clang_major__ >= 8)
# define TARGET "pclmul,avx512f,avx512dq,avx512bw,avx512vl,vpclmulqdq"
# define USE_VPCLMULQDQ __attribute__((target(TARGET)))
# endif