__lasx_xvfcvth_d_s

LASX intrinsic · group: Floating Point Conversion

Synopsis

__m256d __lasx_xvfcvth_d_s (__m256 a)
#include <lasxintrin.h>
Instruction: xvfcvth.d.s xr, xr
CPU Flags: LASX

Description

Convert single precision floating point elements in higher half of every 128-bit vector of a to double precision.

Operation

int i;
for (i = 0; i < 2; i++) {
  dst.fp64[i] = a.fp32[i + 2];
}
for (; i < 4; i++) {
  dst.fp64[i] = a.fp32[i + 4];
}

// Expands to:

if (0) {
  dst.fp64[0] = a.fp32[2];
  dst.fp64[1] = a.fp32[3];
  dst.fp64[2] = a.fp32[6];
  dst.fp64[3] = a.fp32[7];
}

Tested on real machine.

Latency and Throughput

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

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