__lsx_vrotr_b
LSX intrinsic · group: Shift
Synopsis
__m128i __lsx_vrotr_b (__m128i a, __m128i b)
#include <lsxintrin.h>
Instruction: vrotr.b vr, vr, vr
CPU Flags: LSX
Description
Rotate right each unsigned 8-bit element in a by the corresponding element of b modulo 8, store the result in dst.
Operation
for (int i = 0; i < 16; i++) {
dst.byte[i] =
(a.byte[i] >> (b.byte[i] & 0x7)) | (a.byte[i] << (8 - (b.byte[i] & 0x7)));
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 2 | 2 |
| 3A6000 | LA664 | 1 | 4 |
| 3C6000 | LA664 | 1 | 4 |
| 2K1000LA | LA264 | 2 | 1 |
| 2K3000 | LA364E | 1 | 1 |