__lsx_vfmaxa_s

LSX intrinsic · group: Floating Point Computation

Synopsis

__m128 __lsx_vfmaxa_s (__m128 a, __m128 b)
#include <lsxintrin.h>
Instruction: vfmaxa.s vr, vr, vr
CPU Flags: LSX

Description

Compute the maximum (maxNumMag) of single precision floating point elements in a and b, selecting the element with the larger absolute value.

Operation

for (int i = 0; i < 4; i++) {
  if (abs(a.fp32[i]) > abs(b.fp32[i])) {
    dst.fp32[i] = a.fp32[i];
  } else if (abs(b.fp32[i]) > abs(a.fp32[i])) {
    dst.fp32[i] = b.fp32[i];
  } else {
    dst.fp32[i] = fmax(a.fp32[i], b.fp32[i]);
  }
}

Tested on real machine.

Latency and Throughput

CPU	µarch	Latency	Throughput (IPC)
3C5000	LA464	2	2
3A6000	LA664	2	4
3C6000	LA664	2	4
2K1000LA	LA264	2	1
2K3000	LA364E	2	1

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