__lasx_xvbitrev_w
LASX intrinsic · group: Bitwise Operations
Synopsis
__m256i __lasx_xvbitrev_w (__m256i a, __m256i b)
#include <lasxintrin.h>
Instruction: xvbitrev.w xr, xr, xr
CPU Flags: LASX
Description
For each 32-bit element, toggle the bit indexed by the corresponding element of b modulo 32, save the result in dst.
Examples
__m256i __lasx_xvbitrev_w(__m256i{0x0f0f0f0f0f0f0f0f, 0x99aabbccddeeff00, 0xabcdef1212341234, 0xaabbaabbddeeddee}, __m256i{0xabababababababab, 0x1234123443214321, 0x1234123443214321, 0x5678567856785678})
= 0x0f0f070f0f0f070f 0x99babbccddeeff02 0xabddef1212341236 0xabbbaabbdceeddee
Operation
for (int i = 0; i < 8; i++) {
dst.word[i] = a.word[i] ^ ((u32)1 << (b.word[i] % 32));
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 2 | 2 |
| 3A6000 | LA664 | 2 | 2 |
| 3C6000 | LA664 | 2 | 2 |