__lasx_xvextl_q_d

LASX intrinsic · group: Misc

Synopsis

__m256i __lasx_xvextl_q_d (__m256i a)
#include <lasxintrin.h>
Instruction: xvextl.q.d xr, xr
CPU Flags: LASX

Description

Sign-extend 64-bit elements in the lower half of every 128-bit vector of a to 128-bit.

Operation

int i;
for (i = 0; i < 1; i++) {
  dst.qword[i] = (s128)(s64)a.dword[i];
}
for (; i < 2; i++) {
  dst.qword[i] = (s128)(s64)a.dword[i + 1];
}

// Expands to:

if (0) {
  dst.qword[0] = (s128)((s64)a.dword[0]);
  dst.qword[1] = (s128)((s64)a.dword[2]);
}

Tested on real machine.

Latency and Throughput

CPU	µarch	Latency	Throughput (IPC)
3C5000	LA464	1	2
3A6000	LA664	1	4
3C6000	LA664	1	4

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