File: ntz.h

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#ifndef	_NTZ_H
#define	_NTZ_H

/* Number of Tail Zeros:  ntz(x)= (ffs(x) ? ffs(x)-1 : 16)
   It works with all: cpp, gcc and gas expressions.	*/
#define ntz(x)	\
	( (1 & (((x) & 1) == 0))        \
	+ (1 & (((x) & 3) == 0))        \
    	+ (1 & (((x) & 7) == 0))        \
        + (1 & (((x) & 017) == 0))      \
        + (1 & (((x) & 037) == 0))      \
	+ (1 & (((x) & 077) == 0))      \
	+ (1 & (((x) & 0177) == 0))     \
	+ (1 & (((x) & 0377) == 0))     \
	+ (1 & (((x) & 0777) == 0))     \
	+ (1 & (((x) & 01777) == 0))    \
	+ (1 & (((x) & 03777) == 0))    \
	+ (1 & (((x) & 07777) == 0))    \
	+ (1 & (((x) & 017777) == 0))   \
	+ (1 & (((x) & 037777) == 0))   \
	+ (1 & (((x) & 077777) == 0))   \
	+ (1 & (((x) & 0177777) == 0)) )

#endif	/* !_NTZ_H */