diff options
Diffstat (limited to 'posix/sched_cpucount.c')
| -rw-r--r-- | posix/sched_cpucount.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/posix/sched_cpucount.c b/posix/sched_cpucount.c index d7f6b7b49f..331c0b8dfc 100644 --- a/posix/sched_cpucount.c +++ b/posix/sched_cpucount.c @@ -21,31 +21,39 @@ int -__sched_cpucount (size_t setsize, cpu_set_t *setp) +__sched_cpucount (size_t setsize, const cpu_set_t *setp) { int s = 0; - for (unsigned int j = 0; j < setsize / sizeof (__cpu_mask); ++j) + const __cpu_mask *p = setp->__bits; + const __cpu_mask *end = &setp->__bits[setsize / sizeof (__cpu_mask)]; + + while (p < end) { - __cpu_mask l = setp->__bits[j]; + __cpu_mask l = *p++; + +#ifdef POPCNT + s += POPCNT (l); +#else if (l == 0) continue; -#if LONG_BIT > 32 +# if LONG_BIT > 32 l = (l & 0x5555555555555555ul) + ((l >> 1) & 0x5555555555555555ul); l = (l & 0x3333333333333333ul) + ((l >> 2) & 0x3333333333333333ul); l = (l & 0x0f0f0f0f0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0f0f0f0f0ful); l = (l & 0x00ff00ff00ff00fful) + ((l >> 8) & 0x00ff00ff00ff00fful); l = (l & 0x0000ffff0000fffful) + ((l >> 16) & 0x0000ffff0000fffful); l = (l & 0x00000000fffffffful) + ((l >> 32) & 0x00000000fffffffful); -#else +# else l = (l & 0x55555555ul) + ((l >> 1) & 0x55555555ul); l = (l & 0x33333333ul) + ((l >> 2) & 0x33333333ul); l = (l & 0x0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0ful); l = (l & 0x00ff00fful) + ((l >> 8) & 0x00ff00fful); l = (l & 0x0000fffful) + ((l >> 16) & 0x0000fffful); -#endif +# endif s += l; +#endif } return s; |