__lasx_xvpcnt_w
LASX intrinsic · group: Bitwise Operations
Synopsis
__m256i __lasx_xvpcnt_w (__m256i a)
#include <lasxintrin.h>
Instruction: xvpcnt.w xr, xr
CPU Flags: LASX
Description
Count the number of ones (population, popcount) in 32-bit elements in a.
Examples
__m256i __lasx_xvpcnt_w(__m256i{ 0x1122334455667788, 0x99aabbccddeeff00, 0xabcdef1212341234, 0xaabbaabbddeeddee})
= 0x0000000a00000010 0x0000001200000014 0x000000130000000a 0x0000001400000018
Operation
for (int i = 0; i < 8; i++) {
dst.word[i] = popcount(a.word[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 |