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/*
* 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)
}
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