__lasx_xvbitsel_v
LASX intrinsic · group: Bitwise Operations
Synopsis
__m256i __lasx_xvbitsel_v (__m256i a, __m256i b, __m256i c)
#include <lasxintrin.h>
Instruction: xvbitsel.v xr, xr, xr, xr
CPU Flags: LASX
Description
Compute bitwise selection: for each bit position, if the bit in c equals to one, copy the bit from b to dst, otherwise copy from a.
Examples
__m256i __lasx_xvbitsel_v(__m256i{0x1122334455667788, 0x99aabbccddeeff00, 0xabcdef1212341234, 0xaabbaabbddeeddee}, __m256i{0xabababababababab, 0x1234123443214321, 0x1234123443214321, 0x5678567856785678}, __m256i{0xffff0000aaaabbbb, 0x1111222233334444, 0x00000000ffffffff, 0xffffffff00000000})
= 0xabab3344ffeeefab 0x98ba9beccfedfb00 0xabcdef1243214321 0x56785678ddeeddee
Operation
for (int i = 0; i < 4; i++) {
dst.dword[i] = (c.dword[i] & b.dword[i]) | (~c.dword[i] & a.dword[i]);
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 1 | 2 |
| 3A6000 | LA664 | 1 | 2 |
| 3C6000 | LA664 | 1 | 2 |