__lasx_xvsigncov_b

LASX intrinsic · group: Misc

Synopsis

__m256i __lasx_xvsigncov_b (__m256i a, __m256i b)
#include <lasxintrin.h>
Instruction: xvsigncov.b xr, xr, xr
CPU Flags: LASX

Description

If the 8-bit element in a equals to zero, set the result to zero. If the signed 8-bit element in a is positive, copy element in b to result. Otherwise, copy negated element in b to result. If a and b are the same vectors, it is equivalent to computing absolute value.

Operation

for (int i = 0; i < 32; i++) {
  dst.byte[i] =
      (a.byte[i] == 0) ? 0 : ((s8)a.byte[i] > 0 ? b.byte[i] : -b.byte[i]);
}

Tested on real machine.

Latency and Throughput

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

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