__lasx_xvbitset_b
LASX intrinsic · group: Bitwise Operations
Synopsis
__m256i __lasx_xvbitset_b (__m256i a, __m256i b)
#include <lasxintrin.h>
Instruction: xvbitset.b xr, xr, xr
CPU Flags: LASX
Description
For each 8-bit element, set the bit indexed by the corresponding element of b modulo 8, save the result in dst.
Examples
__m256i __lasx_xvbitset_b(__m256i{0x0000000000000000, 0x99aabbccddeeff00, 0xabcdef1212341234, 0xaabbaabbddeeddee}, __m256i{0xabababababababab, 0x1234123443214321, 0x1234123443214321, 0x5678567856785678})
= 0x0808080808080808 0x9dbabfdcddeeff02 0xafddef121a361a36 0xeabbeabbddefddef
Operation
for (int i = 0; i < 32; 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 |