3 double nextafter(double x
, double y
)
5 union {double f
; uint64_t i
;} ux
={x
}, uy
={y
};
9 if (isnan(x
) || isnan(y
))
18 ux
.i
= (uy
.i
& 1ULL<<63) | 1;
19 } else if (ax
> ay
|| ((ux
.i
^ uy
.i
) & 1ULL<<63))
23 e
= ux
.i
>> 52 & 0x7ff;
24 /* raise overflow if ux.f is infinite and x is finite */
27 /* raise underflow if ux.f is subnormal or zero */
29 FORCE_EVAL(x
*x
+ ux
.f
*ux
.f
);