1 /* Compute remainder and a congruent to the quotient.
2 Copyright (C) 1997-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 #include <math_private.h>
22 #include <libm-alias-ldouble.h>
25 static const _Float128 zero
= 0.0;
29 __remquol (_Float128 x
, _Float128 y
, int *quo
)
35 GET_LDOUBLE_WORDS64 (hx
, lx
, x
);
36 GET_LDOUBLE_WORDS64 (hy
, ly
, y
);
37 sx
= hx
& 0x8000000000000000ULL
;
38 qs
= sx
^ (hy
& 0x8000000000000000ULL
);
39 hy
&= 0x7fffffffffffffffLL
;
40 hx
&= 0x7fffffffffffffffLL
;
42 /* Purge off exception values. */
44 return (x
* y
) / (x
* y
); /* y = 0 */
45 if ((hx
>= 0x7fff000000000000LL
) /* x not finite */
46 || ((hy
>= 0x7fff000000000000LL
) /* y is NaN */
47 && (((hy
- 0x7fff000000000000LL
) | ly
) != 0)))
48 return (x
* y
) / (x
* y
);
50 if (hy
<= 0x7ffbffffffffffffLL
)
51 x
= __ieee754_fmodl (x
, 8 * y
); /* now x < 8y */
53 if (((hx
- hy
) | (lx
- ly
)) == 0)
63 if (hy
<= 0x7ffcffffffffffffLL
&& x
>= 4 * y
)
68 if (hy
<= 0x7ffdffffffffffffLL
&& x
>= 2 * y
)
74 if (hy
< 0x0002000000000000LL
)
89 _Float128 y_half
= L(0.5) * y
;
102 *quo
= qs
? -cquo
: cquo
;
104 /* Ensure correct sign of zero result in round-downward mode. */
111 libm_alias_ldouble (__remquo
, remquo
)