__lasx_xvsran_h_w

LASX intrinsic · group: Shift

Synopsis

__m256i __lasx_xvsran_h_w (__m256i a, __m256i b)
#include <lasxintrin.h>
Instruction: xvsran.h.w xr, xr, xr
CPU Flags: LASX

Description

Arithmetic right shift each signed 32-bit element in a by the corresponding element of b modulo 32, write the lower 16 bits of the shifted result into the lower half of each 128-bit lane of dst, and zero the upper half.

Operation

for (int i = 0; i < 8; i++) {
  dst.half[i] = (i < 4) ? (s16)((s32)a.word[i] >> (b.word[i] & 31)) : 0;
}
for (int i = 8; i < 16; i++) {
  dst.half[i] =
      (i < 12) ? (s16)((s32)a.word[i - 4] >> (b.word[i - 4] & 31)) : 0;
}

Tested on real machine.

Latency and Throughput

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

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