github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/runtime/lfstack_32bit.go (about) 1 // Copyright 2014 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 //go:build 386 || arm || mips || mipsle 6 // +build 386 arm mips mipsle 7 8 package runtime 9 10 import "unsafe" 11 12 // On 32-bit systems, the stored uint64 has a 32-bit pointer and 32-bit count. 13 14 func lfstackPack(node *lfnode, cnt uintptr) uint64 { 15 return uint64(uintptr(unsafe.Pointer(node)))<<32 | uint64(cnt) 16 } 17 18 func lfstackUnpack(val uint64) *lfnode { 19 return (*lfnode)(unsafe.Pointer(uintptr(val >> 32))) 20 }