// 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.

//go:build !purego

package sha1

import (
	
	
)

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

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

var useAVX2 = cpu.X86.HasAVX && cpu.X86.HasAVX2 && cpu.X86.HasBMI1 && cpu.X86.HasBMI2
var useSHANI = cpu.X86.HasAVX && cpu.X86.HasSHA && cpu.X86.HasSSE41 && cpu.X86.HasSSSE3

func init() {
	impl.Register("sha1", "AVX2", &useAVX2)
	impl.Register("sha1", "SHA-NI", &useSHANI)
}

func block( *digest,  []byte) {
	if useSHANI {
		blockSHANI(, )
	} else if useAVX2 && len() >= 256 {
		// blockAVX2 calculates sha1 for 2 block per iteration and also
		// interleaves precalculation for next block. So it may read up-to 192
		// bytes past end of p. We could add checks inside blockAVX2, but this
		// would just turn it into a copy of the old pre-AVX2 amd64 SHA1
		// assembly implementation, so just call blockGeneric instead.
		 := len() - 128
		if %128 != 0 {
			 -= 64
		}
		blockAVX2(, [:])
		blockGeneric(, [:])
	} else {
		blockGeneric(, )
	}
}