ref: 3a9a49defb741ae55fe98d112e9faedd80a958f9
dir: /bench/amd64cpuinfo.c/
/*
BLAKE2 reference source code package - benchmark tool
Written in 2012 by Samuel Neves <sneves@dei.uc.pt>
To the extent possible under law, the author(s) have dedicated all copyright
and related and neighboring rights to this software to the public domain
worldwide. This software is distributed without any warranty.
You should have received a copy of the CC0 Public Domain Dedication along with
this software. If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
unsigned long long cpucycles( void )
{
unsigned long long result;
asm volatile( ".byte 15;.byte 49;shlq $32,%%rdx;orq %%rdx,%%rax"
: "=a" ( result ) :: "%rdx" );
return result;
}