/usr/include/volk/volk_64u_popcnt.h is in gnuradio-dev 3.7.2.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | #ifndef INCLUDED_volk_64u_popcnt_a_H
#define INCLUDED_volk_64u_popcnt_a_H
#include <stdio.h>
#include <inttypes.h>
#ifdef LV_HAVE_GENERIC
static inline void volk_64u_popcnt_generic(uint64_t* ret, const uint64_t value) {
//const uint32_t* valueVector = (const uint32_t*)&value;
// This is faster than a lookup table
//uint32_t retVal = valueVector[0];
uint32_t retVal = (uint32_t)(value & 0x00000000FFFFFFFF);
retVal = (retVal & 0x55555555) + (retVal >> 1 & 0x55555555);
retVal = (retVal & 0x33333333) + (retVal >> 2 & 0x33333333);
retVal = (retVal + (retVal >> 4)) & 0x0F0F0F0F;
retVal = (retVal + (retVal >> 8));
retVal = (retVal + (retVal >> 16)) & 0x0000003F;
uint64_t retVal64 = retVal;
//retVal = valueVector[1];
retVal = (uint32_t)((value & 0xFFFFFFFF00000000) >> 31);
retVal = (retVal & 0x55555555) + (retVal >> 1 & 0x55555555);
retVal = (retVal & 0x33333333) + (retVal >> 2 & 0x33333333);
retVal = (retVal + (retVal >> 4)) & 0x0F0F0F0F;
retVal = (retVal + (retVal >> 8));
retVal = (retVal + (retVal >> 16)) & 0x0000003F;
retVal64 += retVal;
*ret = retVal64;
}
#endif /*LV_HAVE_GENERIC*/
#if LV_HAVE_SSE4_2 && LV_HAVE_64
#include <nmmintrin.h>
static inline void volk_64u_popcnt_a_sse4_2(uint64_t* ret, const uint64_t value) {
*ret = _mm_popcnt_u64(value);
}
#endif /*LV_HAVE_SSE4_2*/
#endif /*INCLUDED_volk_64u_popcnt_a_H*/
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