GoToSocial/vendor/codeberg.org/gruf/go-bitutil/abs.go

30 lines
757 B
Go

package bitutil
// Abs8 returns the absolute value of i (calculated without branching).
func Abs8(i int8) int8 {
const bits = 8
u := uint64(i >> (bits - 1))
return (i ^ int8(u)) + int8(u&1)
}
// Abs16 returns the absolute value of i (calculated without branching).
func Abs16(i int16) int16 {
const bits = 16
u := uint64(i >> (bits - 1))
return (i ^ int16(u)) + int16(u&1)
}
// Abs32 returns the absolute value of i (calculated without branching).
func Abs32(i int32) int32 {
const bits = 32
u := uint64(i >> (bits - 1))
return (i ^ int32(u)) + int32(u&1)
}
// Abs64 returns the absolute value of i (calculated without branching).
func Abs64(i int64) int64 {
const bits = 64
u := uint64(i >> (bits - 1))
return (i ^ int64(u)) + int64(u&1)
}