__lsx_vsrlr_w

LSX intrinsic · group: Shift

Synopsis

__m128i __lsx_vsrlr_w (__m128i a, __m128i b)
#include <lsxintrin.h>
Instruction: vsrlr.w vr, vr, vr
CPU Flags: LSX

Description

Logical right shift with rounding each unsigned 32-bit element in a by the corresponding element of b modulo 32, store the result in dst.

Operation

for (int i = 0; i < 4; i++) {
  if ((b.word[i] & 0x1f) == 0) {
    dst.word[i] = a.word[i];
  } else {
    dst.word[i] = (a.word[i] >> (b.word[i] & 0x1f)) +
                  ((a.word[i] >> ((b.word[i] & 0x1f) - 1)) & 0x1);
  }
}

Tested on real machine.

Latency and Throughput

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

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All intrinsics in alphabetical order