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builtin: optimize hex() (#11261)

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This commit is contained in:
penguindark
2021-08-22 10:10:24 +02:00
committed by GitHub
parent 2f6b2dd189
commit fde934cd93
2 changed files with 23 additions and 10 deletions
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16
vlib/builtin/int.v
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@ -256,13 +256,12 @@ pub fn (b bool) str() string {
[direct_array_access; inline]
fn u64_to_hex(nn u64, len byte) string {
mut n := nn
mut buf := [256]byte{}
mut buf := [17]byte{}
buf[len] = 0
mut i := 0
for i = len - 1; i >= 0; i-- {
d := byte(n & 0xF)
x := if d < 10 { d + `0` } else { d + 87 }
buf[i] = x
buf[i] = if d < 10 { d + `0` } else { d + 87 }
n = n >> 4
}
return unsafe { tos(memdup(&buf[0], len + 1), len) }
@ -272,13 +271,12 @@ fn u64_to_hex(nn u64, len byte) string {
[direct_array_access; inline]
fn u64_to_hex_no_leading_zeros(nn u64, len byte) string {
mut n := nn
mut buf := [256]byte{}
mut buf := [17]byte{}
buf[len] = 0
mut i := 0
for i = len - 1; i >= 0; i-- {
d := byte(n & 0xF)
x := if d < 10 { d + `0` } else { d + 87 }
buf[i] = x
buf[i] = if d < 10 { d + `0` } else { d + 87 }
n = n >> 4
if n == 0 {
break
@ -306,7 +304,11 @@ pub fn (nn byte) hex() string {
// Example: assert i8(10).hex() == '0a'
// Example: assert i8(15).hex() == '0f'
pub fn (nn i8) hex() string {
return byte(nn).hex()
if nn == 0 {
return '00'
}
return u64_to_hex(u64(nn), 2)
//return byte(nn).hex()
}
// hex returns the value of the `u16` as a hexadecimal `string`.