2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 * Developed at SunPro, a Sun Microsystems, Inc. business.
6 * Permission to use, copy, modify, and distribute this
7 * software is freely granted, provided that this notice
9 * ====================================================
12 /* __ieee754_remainder(x,p)
14 * returns x REM p = x - [x/p]*p as if in infinite
15 * precise arithmetic, where [x/p] is the (infinite bit)
16 * integer nearest x/p (in half way case choose the even one).
18 * Based on fmod() return x-[x/p]chopped*p exactlp.
22 #include "math_private.h"
24 static const double zero
= 0.0;
26 double __ieee754_remainder(double x
, double p
)
32 EXTRACT_WORDS(hx
,lx
,x
);
33 EXTRACT_WORDS(hp
,lp
,p
);
38 /* purge off exception values */
39 if((hp
|lp
)==0) return (x
*p
)/(x
*p
); /* p = 0 */
40 if((hx
>=0x7ff00000)|| /* x not finite */
41 ((hp
>=0x7ff00000)&& /* p is NaN */
42 (((hp
-0x7ff00000)|lp
)!=0)))
46 if (hp
<=0x7fdfffff) x
= __ieee754_fmod(x
,p
+p
); /* now x < 2p */
47 if (((hx
-hp
)|(lx
-lp
))==0) return zero
*x
;
63 SET_HIGH_WORD(x
,hx
^sx
);