37 lines
994 B
Go
37 lines
994 B
Go
|
/*
|
||
|
|
* Copyright 2021 ByteDance Inc.
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package rt
|
||
|
|
|
||
|
|
const (
|
||
|
|
MinInt48 = -(1 << 47)
|
||
|
|
MaxInt48 = +(1 << 47) - 1
|
||
|
|
)
|
||
|
|
|
||
|
|
func PackInt(v int) uint64 {
|
||
|
|
if u := uint64(v); v < MinInt48 || v > MaxInt48 {
|
||
|
|
panic("int48 out of range")
|
||
|
|
} else {
|
||
|
|
return ((u >> 63) << 47) | (u & 0x00007fffffffffff)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func UnpackInt(v uint64) int {
|
||
|
|
v &= 0x0000ffffffffffff
|
||
|
|
v |= (v >> 47) * (0xffff << 48)
|
||
|
|
return int(v)
|
||
|
|
}
|