1 /* Compute remainder and a congruent to the quotient.
2 Copyright (C) 1997,1999,2002,2004,2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
5 Jakub Jelinek <jj@ultra.linux.cz>, 1999.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, write to the Free
19 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
24 #include "math_private.h"
25 #include <math_ldbl_opt.h>
28 static const long double zero
= 0.0;
32 __remquol (long double x
, long double y
, int *quo
)
35 u_int64_t sx
,lx
,ly
,qs
;
38 GET_LDOUBLE_WORDS64 (hx
, lx
, x
);
39 GET_LDOUBLE_WORDS64 (hy
, ly
, y
);
40 sx
= hx
& 0x8000000000000000ULL
;
41 qs
= sx
^ (hy
& 0x8000000000000000ULL
);
42 hy
&= 0x7fffffffffffffffLL
;
43 hx
&= 0x7fffffffffffffffLL
;
45 /* Purge off exception values. */
46 if ((hy
| (ly
& 0x7fffffffffffffff)) == 0)
47 return (x
* y
) / (x
* y
); /* y = 0 */
48 if ((hx
>= 0x7ff0000000000000LL
) /* x not finite */
49 || ((hy
>= 0x7ff0000000000000LL
) /* y is NaN */
50 && (((hy
- 0x7ff0000000000000LL
) | ly
) != 0)))
51 return (x
* y
) / (x
* y
);
53 if (hy
<= 0x7fbfffffffffffffLL
)
54 x
= __ieee754_fmodl (x
, 8 * y
); /* now x < 8y */
56 if (((hx
- hy
) | (lx
- ly
)) == 0)
77 if (hy
< 0x0020000000000000LL
)
92 long double y_half
= 0.5L * y
;
105 *quo
= qs
? -cquo
: cquo
;
111 long_double_symbol (libm
, __remquol
, remquol
);