github.com/bytedance/gopkg@v0.0.0-20240514070511-01b2cbcf35e1/internal/runtimex/readunaligned_bigendian.go (about) 1 // Copyright 2021 ByteDance Inc. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 //go:build ppc64 || s390x || mips || mips64 16 // +build ppc64 s390x mips mips64 17 18 // 19 // from golang-go/src/os/endian_little.go 20 21 package runtimex 22 23 import ( 24 "unsafe" 25 ) 26 27 func ReadUnaligned64(p unsafe.Pointer) uint64 { 28 // Equal to runtime.readUnaligned64, but this function can be inlined 29 // compared to use runtime.readUnaligned64 via go:linkname. 30 q := (*[8]byte)(p) 31 return uint64(q[7]) | uint64(q[6])<<8 | uint64(q[5])<<16 | uint64(q[4])<<24 | 32 uint64(q[3])<<32 | uint64(q[2])<<40 | uint64(q[1])<<48 | uint64(q[0])<<56 33 } 34 35 func ReadUnaligned32(p unsafe.Pointer) uint64 { 36 q := (*[4]byte)(p) 37 return uint64(uint32(q[3]) | uint32(q[2])<<8 | uint32(q[1])<<16 | uint32(q[0])<<24) 38 } 39 40 func ReadUnaligned16(p unsafe.Pointer) uint64 { 41 q := (*[2]byte)(p) 42 return uint64(uint32(q[1]) | uint32(q[0])<<8) 43 }