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/usr/share/gocode/src/golang.org/x/crypto/sha3/keccakf_amd64.go is in golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2.

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// Copyright 2015 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 amd64,!appengine,!gccgo

package sha3

// This function is implemented in keccakf_amd64.s.

//go:noescape

func keccakF1600(a *[25]uint64)