SPLAY_EMPTY       124 sys/tree.h     	if (SPLAY_EMPTY(head))						\
SPLAY_EMPTY       160 sys/tree.h         if (SPLAY_EMPTY(head)) {						\
SPLAY_EMPTY       185 sys/tree.h     	if (SPLAY_EMPTY(head))						\
SPLAY_EMPTY       280 sys/tree.h     #define SPLAY_MIN(name, x)		(SPLAY_EMPTY(x) ? NULL	\
SPLAY_EMPTY       282 sys/tree.h     #define SPLAY_MAX(name, x)		(SPLAY_EMPTY(x) ? NULL	\