__lsx_vpcnt_b
LSX intrinsic · group: Bitwise Operations
Synopsis
__m128i __lsx_vpcnt_b (__m128i a)
#include <lsxintrin.h>
Instruction: vpcnt.b vr, vr
CPU Flags: LSX
Description
Count the number of ones (population, popcount) in 8-bit elements in a.
Examples
__m128i __lsx_vpcnt_b(__m128i{0x1122334455667788, 0x99aabbccddeeff00})
= 0x0202040204040602 0x0404060406060800
Operation
for (int i = 0; i < 16; i++) {
dst.byte[i] = popcount(a.byte[i]);
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 2 | 2 |
| 3A6000 | LA664 | 2 | 2 |
| 3C6000 | LA664 | 2 | 2 |
| 2K1000LA | LA264 | 2 | 1 |
| 2K3000 | LA364E | 2 | 1 |