1*627f7eb2Smrg /* GCC Quad-Precision Math Library
2*627f7eb2Smrg Copyright (C) 2012 Free Software Foundation, Inc.
3*627f7eb2Smrg
4*627f7eb2Smrg This file is part of the libquadmath library.
5*627f7eb2Smrg Libquadmath is free software; you can redistribute it and/or
6*627f7eb2Smrg modify it under the terms of the GNU Library General Public
7*627f7eb2Smrg License as published by the Free Software Foundation; either
8*627f7eb2Smrg version 2 of the License, or (at your option) any later version.
9*627f7eb2Smrg
10*627f7eb2Smrg Libquadmath is distributed in the hope that it will be useful,
11*627f7eb2Smrg but WITHOUT ANY WARRANTY; without even the implied warranty of
12*627f7eb2Smrg MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13*627f7eb2Smrg Library General Public License for more details.
14*627f7eb2Smrg
15*627f7eb2Smrg You should have received a copy of the GNU Library General Public
16*627f7eb2Smrg License along with libquadmath; see the file COPYING.LIB. If
17*627f7eb2Smrg not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
18*627f7eb2Smrg Boston, MA 02110-1301, USA. */
19*627f7eb2Smrg
20*627f7eb2Smrg
21*627f7eb2Smrg #ifndef QUADMATH_ROUNDING_MODE_H
22*627f7eb2Smrg #define QUADMATH_ROUNDING_MODE_H
23*627f7eb2Smrg
24*627f7eb2Smrg #include <stdbool.h>
25*627f7eb2Smrg
26*627f7eb2Smrg
27*627f7eb2Smrg #if defined(HAVE_FENV_H)
28*627f7eb2Smrg # include <fenv.h>
29*627f7eb2Smrg #endif /* HAVE_FENV_H */
30*627f7eb2Smrg
31*627f7eb2Smrg static inline int
get_rounding_mode(void)32*627f7eb2Smrg get_rounding_mode (void)
33*627f7eb2Smrg {
34*627f7eb2Smrg #if defined(HAVE_FENV_H) && (defined(FE_DOWNWARD) || defined(FE_TONEAREST) \
35*627f7eb2Smrg || defined(FE_TOWARDZERO) || defined(FE_UPWARD))
36*627f7eb2Smrg return fegetround ();
37*627f7eb2Smrg #else
38*627f7eb2Smrg return 0;
39*627f7eb2Smrg #endif
40*627f7eb2Smrg }
41*627f7eb2Smrg
42*627f7eb2Smrg static inline bool
round_away(bool negative,bool last_digit_odd,bool half_bit,bool more_bits,int mode)43*627f7eb2Smrg round_away (bool negative, bool last_digit_odd, bool half_bit, bool more_bits,
44*627f7eb2Smrg int mode)
45*627f7eb2Smrg {
46*627f7eb2Smrg switch (mode)
47*627f7eb2Smrg {
48*627f7eb2Smrg #ifdef FE_DOWNWARD
49*627f7eb2Smrg case FE_DOWNWARD:
50*627f7eb2Smrg return negative && (half_bit || more_bits);
51*627f7eb2Smrg #endif
52*627f7eb2Smrg
53*627f7eb2Smrg #ifdef FE_DOWNWARD
54*627f7eb2Smrg case FE_TONEAREST:
55*627f7eb2Smrg return half_bit && (last_digit_odd || more_bits);
56*627f7eb2Smrg #endif
57*627f7eb2Smrg
58*627f7eb2Smrg #ifdef FE_TOWARDZERO
59*627f7eb2Smrg case FE_TOWARDZERO:
60*627f7eb2Smrg return false;
61*627f7eb2Smrg #endif
62*627f7eb2Smrg
63*627f7eb2Smrg
64*627f7eb2Smrg #ifdef FE_UPWARD
65*627f7eb2Smrg case FE_UPWARD:
66*627f7eb2Smrg return !negative && (half_bit || more_bits);
67*627f7eb2Smrg #endif
68*627f7eb2Smrg
69*627f7eb2Smrg default:
70*627f7eb2Smrg return false;
71*627f7eb2Smrg }
72*627f7eb2Smrg }
73*627f7eb2Smrg
74*627f7eb2Smrg #endif /* QUADMATH_ROUNDING_MODE_H */
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