From 5fce15a2a3cd94427bb9979d73acf14013ec7f31 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@golang.org>
Date: Fri, 14 Nov 2014 12:55:23 -0500
Subject: [dev.cc] runtime: fix lfstack for amd64 addresses in top half of addr
 space

While we are here, add the linux/power64 version.

LGTM=austin
R=austin
CC=aram, dvyukov, golang-codereviews
https://golang.org/cl/177750043
---
 src/runtime/lfstack_32bit.go | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

(limited to 'src/runtime/lfstack_32bit.go')

diff --git a/src/runtime/lfstack_32bit.go b/src/runtime/lfstack_32bit.go
index 0eebbd9740..61d8678d9c 100644
--- a/src/runtime/lfstack_32bit.go
+++ b/src/runtime/lfstack_32bit.go
@@ -6,8 +6,16 @@
 
 package runtime
 
+import "unsafe"
+
 // On 32-bit systems, the stored uint64 has a 32-bit pointer and 32-bit count.
-const (
-	lfPtrBits   = 32
-	lfCountMask = 1<<32 - 1
-)
+
+func lfstackPack(node *lfnode, cnt uintptr) uint64 {
+	return uint64(uintptr(unsafe.Pointer(node)))<<32 | uint64(cnt)
+}
+
+func lfstackUnpack(val uint64) (node *lfnode, cnt uintptr) {
+	node = (*lfnode)(unsafe.Pointer(uintptr(val >> 32)))
+	cnt = uintptr(val)
+	return
+}
-- 
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