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Fix slower CV_PAUSE on SkyLake and above.

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This is fixing https://github.com/opencv/opencv/issues/22852
This commit is contained in:
Vincent Rabaud 2022-12-15 12:28:30 +01:00
parent 52709c7771
commit b7b08fa0c3
1 changed files with 4 additions and 1 deletions
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5
modules/core/src/parallel_impl.cpp
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@ -52,11 +52,14 @@ DECLARE_CV_PAUSE
#endif
#ifndef CV_PAUSE
# if defined __GNUC__ && (defined __i386__ || defined __x86_64__)
# include <x86intrin.h> /* for __rdtsc */
# if !defined(__SSE2__)
static inline void cv_non_sse_mm_pause() { __asm__ __volatile__ ("rep; nop"); }
# define _mm_pause cv_non_sse_mm_pause
# endif
# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { _mm_pause(); } } while (0)
// 5 * v is meants for backward compatibility: with pre-Skylake CPUs, _mm_pause took 4 or 5 cycles.
// With post-Skylake CPUs, _mm_pause takes 140 cycles.
# define CV_PAUSE(v) do { const uint64_t __delay = 5 * v; uint64_t __init = __rdtsc(); do { _mm_pause(); } while ((__rdtsc() - __init) < __delay); } while (0)
# elif defined __GNUC__ && defined __aarch64__
# define CV_PAUSE(v) do { for (int __delay = (v); __delay > 0; --__delay) { asm volatile("yield" ::: "memory"); } } while (0)
# elif defined __GNUC__ && defined __arm__