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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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2
src/core.c
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@ -6786,7 +6786,7 @@ __hot static pgno_t *scan4seq_neon(pgno_t *range, const size_t len,
#ifdef scan4seq_impl
/* The scan4seq_impl() is the best or no alternatives */
#elif !MDBX_HAVE_BUILTIN_CPU_SUPPORTS
/* The scan4seq_default() will be used since no cpu-features detection support
/* The scan4seq_default() will be used since no cpu-features detection support
* from compiler. Please don't ask to implement cpuid-based detection and don't
* make such PRs. */
#define scan4seq_impl scan4seq_default

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