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