1 /*
2 * Copyright 2021 ByteDance Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 17 package cpu
18 19 import (
20 `fmt`
21 `os`
22 23 `github.com/klauspost/cpuid/v2`
24 )
25 26 var (
27 HasAVX2 = cpuid.CPU.Has(cpuid.AVX2)
28 HasSSE = cpuid.CPU.Has(cpuid.SSE)
29 )
30 31 func init() {
32 switch v := os.Getenv("SONIC_MODE"); v {
33 case "" : break
34 case "auto" : break
35 case "noavx" : HasAVX2 = false
36 // will also disable avx, act as `noavx`, we remain it to make sure forward compatibility
37 case "noavx2" : HasAVX2 = false
38 default : panic(fmt.Sprintf("invalid mode: '%s', should be one of 'auto', 'noavx', 'noavx2'", v))
39 }
40 }
41