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Improve parseInt throughput for short numbers #285

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Improve parseInt throughput for short numbers #285

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23 changes: 22 additions & 1 deletion bytes.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,13 +7,34 @@ const maxUint64 = 1<<64 - 1

// About 2x faster then strconv.ParseInt because it only supports base 10, which is enough for JSON
func parseInt(bytes []byte) (v int64, ok bool, overflow bool) {
if len(bytes) == 0 {
l := len(bytes)
if l == 0 {
return 0, false, false
}

var neg bool = false
i := 0
if bytes[0] == '-' {
neg = true
i = 1
}

if l-i < 19 {
for ; i < l; i++ {
d := bytes[i] - '0'
if d > 9 {
return 0, false, false
}
v = 10*v + int64(d)
}

if neg {
return -v, true, false
}
return v, true, false
}

if neg {
bytes = bytes[1:]
}

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