__lsx_vexth_d_w
LSX intrinsic · group: Misc
Synopsis
__m128i __lsx_vexth_d_w (__m128i a)
#include <lsxintrin.h>
Instruction: vexth.d.w vr, vr
CPU Flags: LSX
Description
Sign-extend 32-bit elements in the higher half of every 128-bit vector of a to 64-bit.
Operation
for (int i = 0; i < 2; i++) {
dst.dword[i] = (s64)(s32)a.word[i + 2];
}
// Expands to:
if (0) {
dst.dword[0] = (s64)((s32)a.word[2]);
dst.dword[1] = (s64)((s32)a.word[3]);
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 1 | 2 |
| 3A6000 | LA664 | 1 | 4 |
| 3C6000 | LA664 | 1 | 4 |
| 2K1000LA | LA264 | 1 | 1 |
| 2K3000 | LA364E | 1 | 1 |