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rand: further speed up of rand.uuid_v4

pull/5983/head
Delyan Angelov 2020-07-25 20:20:37 +03:00
parent 3d2fd471b6
commit ee3ebed23c
1 changed files with 3 additions and 5 deletions
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6
vlib/rand/rand.v
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@ -131,7 +131,6 @@ pub fn f64_in_range(min, max f64) f64 {
const (
chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
hex_chars = '0123456789abcdef'
)
pub fn string(len int) string {
@ -154,9 +153,6 @@ pub fn uuid_v4() string {
mut c := 0
for c < 16 && i_buf < 36 {
mut d := byte(x) & 0x0F
if i_buf == 19 {
d = (d & 0x03) + 0x08
}
unsafe {
buf[i_buf] = if d > 9 { d + 87 } else { d + 48 }
}
@ -165,11 +161,13 @@ pub fn uuid_v4() string {
x = x >> 4
}
}
n := ((byte(default_rng.u64()) & 0x0F) & 0x03) + 0x08
unsafe {
buf[8] = `-`
buf[13] = `-`
buf[14] = `4`
buf[18] = `-`
buf[19] = if n > 9 { n + 87 } else { n + 48 }
buf[23] = `-`
buf[36] = 0
}