文件操作 - sha1block_amd64.go
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文件: /usr/share/go-1.23/src/crypto/sha1/sha1block_amd64.go
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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. //go:build !purego package sha1 import "internal/cpu" //go:noescape func blockAVX2(dig *digest, p []byte) //go:noescape func blockAMD64(dig *digest, p []byte) var useAVX2 = cpu.X86.HasAVX2 && cpu.X86.HasBMI1 && cpu.X86.HasBMI2 func block(dig *digest, p []byte) { if useAVX2 && len(p) >= 256 { // blockAVX2 calculates sha1 for 2 block per iteration // it also interleaves precalculation for next block. // So it may read up-to 192 bytes past end of p // We may add checks inside blockAVX2, but this will // just turn it into a copy of blockAMD64, // so call it directly, instead. safeLen := len(p) - 128 if safeLen%128 != 0 { safeLen -= 64 } blockAVX2(dig, p[:safeLen]) blockAMD64(dig, p[safeLen:]) } else { blockAMD64(dig, p) } }
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