golang sha256block_amd64 代码
文件路径：/src/crypto/sha256/sha256block_amd64.go
/ Copyright 2017 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
package sha256
import "internal/cpu"
var useAVX2 = cpu.X86.HasAVX2 && cpu.X86.HasBMI2