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minio/pkgs/erasure/cpufeatures.c

60 lines
1.5 KiB

/*
* Mini Object Storage, (C) 2014 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
static void cpuid(int cpuinfo[4] ,int infotype) {
__asm__ __volatile__ (
"cpuid":
"=a" (cpuinfo[0]),
"=b" (cpuinfo[1]),
"=c" (cpuinfo[2]),
"=d" (cpuinfo[3]) :
"a" (infotype), "c" (0)
);
}
/*
SSE41 : return true
no SSE41 : return false
*/
int has_sse41 (void) {
int info[4];
cpuid(info, 0x00000001);
return ((info[2] & ((int)1 << 19)) != 0);
}
/*
AVX : return true
no AVX : return false
*/
int has_avx (void) {
int info[4];
cpuid(info, 0x00000001);
return ((info[2] & ((int)1 << 28)) != 0);
}
/*
AVX2 : return true
no AVX2 : return false
*/
int has_avx2 (void) {
int info[4];
cpuid(info, 0x00000007);
return ((info[1] & ((int)1 << 5)) != 0);
}