__lasx_xvclz_d
LASX intrinsic · group: Bitwise Operations
Synopsis
__m256i __lasx_xvclz_d (__m256i a)
#include <lasxintrin.h>
Instruction: xvclz.d xr, xr
CPU Flags: LASX
Description
Count leading zeros of 64-bit elements in a.
Examples
__m256i __lasx_xvclz_d(__m256i{ 0x1122334455667788, 0x99aabbccddeeff00, 0xabcdef1212341234, 0xaabbaabbddeeddee})
= 0x0000000000000003 0x0000000000000000 0x0000000000000000 0x0000000000000000
Operation
for (int i = 0; i < 4; i++) {
dst.dword[i] = clz(a.dword[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 |