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/usr/share/gocode/src/golang.org/x/crypto/blake2b/blake2bAVX2_amd64.go is in golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2.

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// 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.

// +build go1.7,amd64,!gccgo,!appengine

package blake2b

func init() {
	useAVX2 = supportsAVX2()
	useAVX = supportsAVX()
	useSSE4 = supportsSSE4()
}

//go:noescape
func supportsSSE4() bool

//go:noescape
func supportsAVX() bool

//go:noescape
func supportsAVX2() bool

//go:noescape
func hashBlocksAVX2(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte)

//go:noescape
func hashBlocksAVX(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte)

//go:noescape
func hashBlocksSSE4(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte)

func hashBlocks(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
	if useAVX2 {
		hashBlocksAVX2(h, c, flag, blocks)
	} else if useAVX {
		hashBlocksAVX(h, c, flag, blocks)
	} else if useSSE4 {
		hashBlocksSSE4(h, c, flag, blocks)
	} else {
		hashBlocksGeneric(h, c, flag, blocks)
	}
}