__lasx_xvexth_w_h
LASX intrinsic · group: Misc
Synopsis
__m256i __lasx_xvexth_w_h (__m256i a)
#include <lasxintrin.h>
Instruction: xvexth.w.h xr, xr
CPU Flags: LASX
Description
Sign-extend 16-bit elements in the higher half of every 128-bit vector of a to 32-bit.
Operation
int i;
for (i = 0; i < 4; i++) {
dst.word[i] = (s32)(s16)a.half[i + 4];
}
for (; i < 8; i++) {
dst.word[i] = (s32)(s16)a.half[i + 8];
}
// Expands to:
if (0) {
dst.word[0] = (s32)((s16)a.half[4]);
dst.word[1] = (s32)((s16)a.half[5]);
dst.word[2] = (s32)((s16)a.half[6]);
dst.word[3] = (s32)((s16)a.half[7]);
dst.word[4] = (s32)((s16)a.half[12]);
dst.word[5] = (s32)((s16)a.half[13]);
dst.word[6] = (s32)((s16)a.half[14]);
dst.word[7] = (s32)((s16)a.half[15]);
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 1 | 2 |
| 3A6000 | LA664 | 1 | 4 |
| 3C6000 | LA664 | 1 | 4 |