github.com/bytedance/sonic@v1.11.7-0.20240517092252-d2edb31b167b/internal/rt/int48.go (about) 1 /* 2 * Copyright 2021 ByteDance Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package rt 18 19 const ( 20 MinInt48 int64 = -(1 << 47) 21 MaxInt48 int64 = +(1 << 47) - 1 22 ) 23 24 func PackInt(v int) uint64 { 25 if u := uint64(v); int64(v) < MinInt48 || int64(v) > MaxInt48 { 26 panic("int48 out of range") 27 } else { 28 return ((u >> 63) << 47) | (u & 0x00007fffffffffff) 29 } 30 } 31 32 func UnpackInt(v uint64) int { 33 v &= 0x0000ffffffffffff 34 v |= (v >> 47) * (0xffff << 48) 35 return int(v) 36 }