Added Marcus version of __swap_int16(); it's commented out for now, though,

but we might want to add it later.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4561 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/libroot/os/arch/x86/byteorder.S

@@ -14,6 +14,15 @@ FUNCTION(__swap_int16):
 	shr		$16, %eax
 	ret
 
+/* this one is much faster on a P4, courtesy of Marcus Overhagen,
+ * a good candidate for per processor optimizations: */
+/*
+FUNCTION(__swap_int16_p4):
+	movl	4(%esp), %eax
+	rolw	$8, %ax
+	ret
+*/
+
 /* uint32 __swap_int32(uint32 value) */
 FUNCTION(__swap_int32):
 	movl	4(%esp), %eax