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37 lines
924 B
Go
37 lines
924 B
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package sha1
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import "internal/cpu"
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//go:noescape
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func blockAVX2(dig *digest, p []byte)
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//go:noescape
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func blockAMD64(dig *digest, p []byte)
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var useAVX2 = cpu.X86.HasAVX2 && cpu.X86.HasBMI1 && cpu.X86.HasBMI2
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func block(dig *digest, p []byte) {
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if useAVX2 && len(p) >= 256 {
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// blockAVX2 calculates sha1 for 2 block per iteration
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// it also interleaves precalculation for next block.
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// So it may read up-to 192 bytes past end of p
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// We may add checks inside blockAVX2, but this will
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// just turn it into a copy of blockAMD64,
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// so call it directly, instead.
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safeLen := len(p) - 128
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if safeLen%128 != 0 {
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safeLen -= 64
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}
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blockAVX2(dig, p[:safeLen])
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blockAMD64(dig, p[safeLen:])
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} else {
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blockAMD64(dig, p)
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}
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}
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