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util/deephash: simplify hex encode

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With https://go-review.googlesource.com/c/go/+/332689,

Before:
	BenchmarkHash-24                   62504             19250 ns/op            2297 B/op         58 allocs/op
	BenchmarkHashMapAcyclic-24         39852             30119 ns/op            2532 B/op        202 allocs/op

After:
	BenchmarkHash-24                   62440             19271 ns/op            2298 B/op         58 allocs/op
	BenchmarkHashMapAcyclic-24         39592             30307 ns/op            2532 B/op        202 allocs/op

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
This commit is contained in:
David Crawshaw 2021-07-03 08:41:56 -07:00
parent 700badd8f8
commit 9244c0447e
1 changed files with 1 additions and 7 deletions
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8
util/deephash/deephash.go
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@ -26,13 +26,7 @@ func calcHash(v interface{}) string {
scratch := make([]byte, 0, 128)
printTo(b, v, scratch)
b.Flush()
scratch = h.Sum(scratch[:0])
// The first sha256.Size bytes contain the hash.
// Hex-encode that into the next sha256.Size*2 bytes.
src := scratch[:sha256.Size]
dst := scratch[sha256.Size:cap(scratch)]
n := hex.Encode(dst, src)
return string(dst[:n])
return hex.EncodeToString(h.Sum(scratch[:0]))
}
// UpdateHash sets last to the hash of v and reports whether its value changed.