__lasx_xvclz_b
LASX intrinsic · group: Bitwise Operations
Synopsis
__m256i __lasx_xvclz_b (__m256i a)
#include <lasxintrin.h>
Instruction: xvclz.b xr, xr
CPU Flags: LASX
Description
Count leading zeros of 8-bit elements in a.
Examples
__m256i __lasx_xvclz_b(__m256i{ 0x1122334455667788, 0x99aabbccddeeff00, 0xabcdef1212341234, 0xaabbaabbddeeddee})
= 0x0302020101010100 0x0000000000000008 0x0000000303020302 0x0000000000000000
Operation
for (int i = 0; i < 32; i++) {
dst.byte[i] = clz(a.byte[i]);
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 2 | 2 |
| 3A6000 | LA664 | 2 | 4 |
| 3C6000 | LA664 | 2 | 4 |