__lsx_vbitrevi_b
LSX intrinsic · group: Bitwise Operations
Synopsis
__m128i __lsx_vbitrevi_b (__m128i a, imm0_7 imm)
#include <lsxintrin.h>
Instruction: vbitrevi.b vr, vr, imm
CPU Flags: LSX
Description
For each 8-bit element, toggle the bit indexed by imm, save the result in dst.
Examples
__m128i __lsx_vbitrevi_b(__m128i{0x0f0f0f0f0f0f0f0f, 0x99aabbccddeeff00}, 1)
= 0x0d0d0d0d0d0d0d0d 0x9ba8b9cedfecfd02
Operation
for (int i = 0; i < 16; i++) {
dst.byte[i] = a.byte[i] ^ ((u8)1 << imm);
}
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 |