__lsx_vbitrev_b
LSX intrinsic · group: Bitwise Operations
Synopsis
__m128i __lsx_vbitrev_b (__m128i a, __m128i b)
#include <lsxintrin.h>
Instruction: vbitrev.b vr, vr, vr
CPU Flags: LSX
Description
For each 8-bit element, toggle the bit indexed by the corresponding element of b modulo 8, save the result in dst.
Examples
__m128i __lsx_vbitrev_b(__m128i{0x0f0f0f0f0f0f0f0f, 0x99aabbccddeeff00}, __m128i{0xabababababababab, 0x1234123443214321})
= 0x0707070707070707 0x9dbabfdcd5ecf702
Operation
for (int i = 0; i < 16; i++) {
dst.byte[i] = a.byte[i] ^ ((u8)1 << (b.byte[i] % 8));
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 2 | 2 |
| 3A6000 | LA664 | 2 | 2 |
| 3C6000 | LA664 | 2 | 2 |
| 2K1000LA | LA264 | 2 | 1 |
| 2K3000 | LA364E | 2 | 1 |