mirror of
https://github.com/ethereum/go-ethereum.git
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37 lines
753 B
Go
37 lines
753 B
Go
// Copyright 2025 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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//go:build (!amd64 && !arm64) || purego
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package bitutil
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import "unsafe"
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func testBytes(p []byte) bool {
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if supportsUnaligned {
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return fastTestBytes(p)
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}
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return safeTestBytes(p)
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}
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// fastTestBytes tests for set bits in bulk. It only works on architectures that
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// support unaligned read/writes.
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func fastTestBytes(p []byte) bool {
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n := len(p)
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w := n / wordSize
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if w > 0 {
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pw := *(*[]uintptr)(unsafe.Pointer(&p))
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for i := 0; i < w; i++ {
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if pw[i] != 0 {
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return true
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}
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}
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}
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for i := n - n%wordSize; i < n; i++ {
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if p[i] != 0 {
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return true
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}
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}
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return false
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}
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