__lsx_vexth_q_d
LSX intrinsic · group: Misc
Synopsis
__m128i __lsx_vexth_q_d (__m128i a)
#include <lsxintrin.h>
Instruction: vexth.q.d vr, vr
CPU Flags: LSX
Description
Sign-extend 64-bit elements in the higher half of every 128-bit vector of a to 128-bit.
Operation
for (int i = 0; i < 1; i++) {
dst.qword[i] = (s128)(s64)a.dword[i + 1];
}
// Expands to:
if (0) {
dst.qword[0] = (s128)((s64)a.dword[1]);
}
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 |