Revert "runtime: merge lfstack{Pack,Unpack} into one file"

This broke solaris, which apparently does use the upper 17 bits of the address space.

This reverts commit 3b02c5b1b66df9cdb23d5a3243bb37b2c312ea1b.

Change-Id: Iedfe54abd0384960845468205f20191a97751c0b
Reviewed-on: https://go-review.googlesource.com/21652
Reviewed-by: Dave Cheney <dave@cheney.net>

1 files changed, 0 insertions, 35 deletions

diff --git a/src/runtime/lfstack.go b/src/runtime/lfstack.go
index 8a2d519402..1261f54d97 100644
--- a/src/runtime/lfstack.go
+++ b/src/runtime/lfstack.go
@@ -41,38 +41,3 @@ func lfstackpop(head *uint64) unsafe.Pointer {
 		}
 	}
 }
-
-const (
-	addrBits = 48
-	cntBits  = 64 - addrBits + 3
-)
-
-func lfstackPack(node *lfnode, cnt uintptr) uint64 {
-	if unsafe.Sizeof(uintptr(0)) == 4 {
-		// On 32-bit systems, the stored uint64 has a 32-bit pointer and 32-bit count.
-		return uint64(uintptr(unsafe.Pointer(node)))<<32 | uint64(cnt)
-	}
-	// On ppc64, Linux limits the user address space to 46 bits (see
-	// TASK_SIZE_USER64 in the Linux kernel).  This has grown over time,
-	// so here we allow 48 bit addresses.
-	//
-	// On mips64, Linux limits the user address space to 40 bits (see
-	// TASK_SIZE64 in the Linux kernel).  This has grown over time,
-	// so here we allow 48 bit addresses.
-	//
-	// On AMD64, virtual addresses are 48-bit numbers sign extended to 64.
-	// We shift the address left 16 to eliminate the sign extended part and make
-	// room in the bottom for the count.
-	//
-	// In addition to the 16 bits taken from the top, we can take 3 from the
-	// bottom, because node must be pointer-aligned, giving a total of 19 bits
-	// of count.
-	return uint64(uintptr(unsafe.Pointer(node)))<<(64-addrBits) | uint64(cnt&(1<<cntBits-1))
-}
-
-func lfstackUnpack(val uint64) *lfnode {
-	if unsafe.Sizeof(uintptr(0)) == 4 {
-		return (*lfnode)(unsafe.Pointer(uintptr(val >> 32)))
-	}
-	return (*lfnode)(unsafe.Pointer(uintptr(val >> cntBits << 3)))
-}