// 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 !puregopackage sha1import ()//go:noescapefunc blockAVX2( *digest, []byte)//go:noescapefunc blockSHANI( *digest, []byte)var useAVX2 = cpu.X86.HasAVX && cpu.X86.HasAVX2 && cpu.X86.HasBMI1 && cpu.X86.HasBMI2var useSHANI = cpu.X86.HasAVX && cpu.X86.HasSHA && cpu.X86.HasSSE41 && cpu.X86.HasSSSE3func init() {impl.Register("sha1", "AVX2", &useAVX2)impl.Register("sha1", "SHA-NI", &useSHANI)}func block( *digest, []byte) {ifuseSHANI {blockSHANI(, ) } elseifuseAVX2 && 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() - 128if %128 != 0 { -= 64 }blockAVX2(, [:])blockGeneric(, [:]) } else {blockGeneric(, ) }}
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