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better way to do wire signed ints (no negative zero, remove conditionals)

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This commit is contained in:
Arceliar 2018-06-09 16:36:13 -05:00
parent b7e4ff5d5a
commit f5c850f098
1 changed files with 5 additions and 14 deletions
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19
src/yggdrasil/wire.go
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@ -66,23 +66,14 @@ func wire_decode_uint64(bs []byte) (uint64, int) {
} }
func wire_intToUint(i int64) uint64 { func wire_intToUint(i int64) uint64 {
var u uint64 // Non-negative integers mapped to even integers: 0 -> 0, 1 -> 2, etc.
if i < 0 { // Negative integres mapped to odd integes: -1 -> 1, -2 -> 3, etc.
u = uint64(-i) << 1 // This means the least significant bit is a sign bit.
u |= 0x01 // sign bit return ((uint64(-(i+1))<<1)|0x01)*(uint64(i)>>63) + (uint64(i)<<1)*(^uint64(i)>>63)
} else {
u = uint64(i) << 1
}
return u
} }
func wire_intFromUint(u uint64) int64 { func wire_intFromUint(u uint64) int64 {
var i int64 return int64(u&0x01)*(-int64(u>>1)-1) + int64(^u&0x01)*int64(u>>1)
i = int64(u >> 1)
if u&0x01 != 0 {
i *= -1
}
return i
} }
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////