// Copyright 2016 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 sha1

import 

//go:noescape
func blockAVX2( *digest,  []byte)

//go:noescape
func blockAMD64( *digest,  []byte)

var useAVX2 = cpu.X86.HasAVX2 && cpu.X86.HasBMI1 && cpu.X86.HasBMI2

func block( *digest,  []byte) {
	if useAVX2 && len() >= 256 {
		// blockAVX2 calculates sha1 for 2 block per iteration
		// it also interleaves precalculation for next block.
		// So it may read up-to 192 bytes past end of p
		// We may add checks inside blockAVX2, but this will
		// just turn it into a copy of blockAMD64,
		// so call it directly, instead.
		 := len() - 128
		if %128 != 0 {
			 -= 64
		}
		blockAVX2(, [:])
		blockAMD64(, [:])
	} else {
		blockAMD64(, )
	}
}