+/* FIXME: we do things this way because of the alpha32 port. once
+ alpha64 has arrived, all this nastiness can go away */
+#if 64 == N_WORD_BITS
+#define LOW_WORD(c) ((pointer_sized_uint_t)c)
+typedef unsigned long lispobj;
+#else
+#define LOW_WORD(c) ((long)(c) & 0xFFFFFFFFL)
+/* fake it on alpha32 */
+typedef unsigned int lispobj;
+#endif
+
+static inline int
+lowtag_of(lispobj obj)
+{
+ return obj & LOWTAG_MASK;
+}
+
+static inline int
+widetag_of(lispobj obj)
+{
+ return obj & WIDETAG_MASK;
+}
+
+static inline unsigned long
+HeaderValue(lispobj obj)
+{
+ return obj >> N_WIDETAG_BITS;
+}
+
+static inline struct cons *
+CONS(lispobj obj)
+{
+ return (struct cons *)(obj - LIST_POINTER_LOWTAG);
+}
+
+static inline struct symbol *
+SYMBOL(lispobj obj)
+{
+ return (struct symbol *)(obj - OTHER_POINTER_LOWTAG);
+}
+
+static inline struct fdefn *
+FDEFN(lispobj obj)
+{
+ return (struct fdefn *)(obj - OTHER_POINTER_LOWTAG);
+}
+
+/* Is the Lisp object obj something with pointer nature (as opposed to
+ * e.g. a fixnum or character or unbound marker)? */
+static inline int
+is_lisp_pointer(lispobj obj)
+{
+ return obj & 1;
+}
+
+#include "fixnump.h"
+
+/* Is the Lisp object obj something with immediate nature (e.g. a
+ * fixnum or character or unbound marker)? */
+static inline int
+is_lisp_immediate(lispobj obj)
+{
+ return (fixnump(obj)
+ || (widetag_of(obj) == CHARACTER_WIDETAG)
+#if N_WORD_BITS == 64
+ || (widetag_of(obj) == SINGLE_FLOAT_WIDETAG)
+#endif
+ || (widetag_of(obj) == UNBOUND_MARKER_WIDETAG));
+}
+
+/* Convert from a lispobj with type bits to a native (ordinary
+ * C/assembly) pointer to the beginning of the object. */
+static inline lispobj *
+native_pointer(lispobj obj)
+{
+ return (lispobj *) ((pointer_sized_uint_t) (obj & ~LOWTAG_MASK));
+}
+
+/* inverse operation: create a suitably tagged lispobj from a native
+ * pointer or integer.*/
+static inline lispobj
+make_lispobj(void *o, int low_tag)
+{
+ return LOW_WORD(o) | low_tag;
+}