__lasx_xvperm_w
LASX intrinsic · group: Permutation
Synopsis
__m256i __lasx_xvperm_w (__m256i a, __m256i b)
#include <lasxintrin.h>
Instruction: xvperm.w xr, xr, xr
CPU Flags: LASX
Description
For each word, use the low 3 bits of the corresponding word in b as an index into the eight words of a, and store the result in dst.
Operation
for (int i = 0; i < 8; i++) {
dst.word[i] = a.word[b.word[i] % 0x8];
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 3 | 2 |
| 3A6000 | LA664 | 3 | 4 |
| 3C6000 | LA664 | 3 | 4 |