]>
git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/ieee754/flt-32/s_fromfpf_main.c
1 /* Round to integer type. flt-32 version.
2 Copyright (C) 2016-2017 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 <http://www.gnu.org/licenses/>. */
22 #include <math_private.h>
30 # define RET_TYPE uintmax_t
32 # define RET_TYPE intmax_t
38 FUNC (float x
, int round
, unsigned int width
)
40 if (width
> INTMAX_WIDTH
)
43 GET_FLOAT_WORD (ix
, x
);
44 bool negative
= (ix
& 0x80000000) != 0;
46 return fromfp_domain_error (negative
, width
);
50 int exponent
= ix
>> (MANT_DIG
- 1);
52 int max_exponent
= fromfp_max_exponent (negative
, width
);
53 if (exponent
> max_exponent
)
54 return fromfp_domain_error (negative
, width
);
56 ix
&= ((1U << (MANT_DIG
- 1)) - 1);
57 ix
|= 1U << (MANT_DIG
- 1);
59 bool half_bit
, more_bits
;
60 if (exponent
>= MANT_DIG
- 1)
63 uret
<<= exponent
- (MANT_DIG
- 1);
67 else if (exponent
>= -1)
69 uint32_t h
= 1U << (MANT_DIG
- 2 - exponent
);
70 half_bit
= (ix
& h
) != 0;
71 more_bits
= (ix
& (h
- 1)) != 0;
72 uret
= ix
>> (MANT_DIG
- 1 - exponent
);
80 return fromfp_round_and_return (negative
, uret
, half_bit
, more_bits
, round
,
81 exponent
, max_exponent
, width
);