mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-10 05:10:26 +00:00
better way to do wire signed ints (no negative zero, remove conditionals)
This commit is contained in:
parent
b7e4ff5d5a
commit
f5c850f098
@ -66,23 +66,14 @@ func wire_decode_uint64(bs []byte) (uint64, int) {
|
||||
}
|
||||
|
||||
func wire_intToUint(i int64) uint64 {
|
||||
var u uint64
|
||||
if i < 0 {
|
||||
u = uint64(-i) << 1
|
||||
u |= 0x01 // sign bit
|
||||
} else {
|
||||
u = uint64(i) << 1
|
||||
}
|
||||
return u
|
||||
// Non-negative integers mapped to even integers: 0 -> 0, 1 -> 2, etc.
|
||||
// Negative integres mapped to odd integes: -1 -> 1, -2 -> 3, etc.
|
||||
// This means the least significant bit is a sign bit.
|
||||
return ((uint64(-(i+1))<<1)|0x01)*(uint64(i)>>63) + (uint64(i)<<1)*(^uint64(i)>>63)
|
||||
}
|
||||
|
||||
func wire_intFromUint(u uint64) int64 {
|
||||
var i int64
|
||||
i = int64(u >> 1)
|
||||
if u&0x01 != 0 {
|
||||
i *= -1
|
||||
}
|
||||
return i
|
||||
return int64(u&0x01)*(-int64(u>>1)-1) + int64(^u&0x01)*int64(u>>1)
|
||||
}
|
||||
|
||||
////////////////////////////////////////////////////////////////////////////////
|
||||
|
Loading…
Reference in New Issue
Block a user