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Merge pull request #22988 from vrabaud:mm_pause_fix

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Alexander Alekhin 2022-12-19 17:06:50 +00:00
commit d44c58a1fb
1 changed files with 2 additions and 3 deletions
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5
modules/core/src/parallel_impl.cpp
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@ -57,9 +57,8 @@ DECLARE_CV_PAUSE
static inline void cv_non_sse_mm_pause() { __asm__ __volatile__ ("rep; nop"); }
# define _mm_pause cv_non_sse_mm_pause
# endif
// 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)
// With Skylake CPUs and above, _mm_pause takes 140 cycles so no need for a loop.
# define CV_PAUSE(v) do { (void)v; _mm_pause(); } 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__