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mdbx-doc: добавлено примечание к опции MDBX_HAVE_BUILTIN_CPU_SUPPORTS.

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Леонид Юрьев (Leonid Yuriev) 2023-02-14 12:09:44 +03:00
parent 2ea9fbe51b
commit 29d12f1fc3
2 changed files with 6 additions and 2 deletions
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6
src/options.h
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@ -220,7 +220,11 @@
#endif /* MDBX_HAVE_C11ATOMICS */
/** If defined then enables use the GCC's `__builtin_cpu_supports()`
* for runtime dispatching depending on the CPU's capabilities. */
* for runtime dispatching depending on the CPU's capabilities.
* \note Defining `MDBX_HAVE_BUILTIN_CPU_SUPPORTS` to `0` should avoided unless
* build for particular single-target platform, since on AMD64/x86 this disables
* dynamic choice (at runtime) of SSE2 / AVX2 / AVX512 instructions
* with fallback to non-accelerated baseline code. */
#ifndef MDBX_HAVE_BUILTIN_CPU_SUPPORTS
#if defined(__APPLE__) || defined(BIONIC)
/* Never use any modern features on Apple's or Google's OSes