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rounding.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Vincent Barichard <Vincent.Barichard@univ-angers.fr>
5  *
6  * Contributing authors:
7  * Christian Schulte <schulte@gecode.org>
8  *
9  * Copyright:
10  * Christian Schulte, 2012
11  * Vincent Barichard, 2012
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
16  *
17  * Permission is hereby granted, free of charge, to any person obtaining
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36  */
37 
38 #include <gecode/float.hh>
39 
40 #ifdef GECODE_HAS_MPFR
41 
42 #include <gmp.h>
43 #include <mpfr.h>
44 
45 namespace Gecode { namespace Float {
46 
48  typedef int mpfr_func(mpfr_t, const __mpfr_struct*, mp_rnd_t);
49 
51  forceinline double
53  mpfr_t xx;
54  mpfr_init_set_d(xx, x, GMP_RNDN);
55  f(xx, xx, r);
56  FloatNum res = mpfr_get_d(xx, r);
57  mpfr_clear(xx);
58  return res;
59  }
60 
62 #define GECODE_GENR_FUNC(name) \
63  FloatNum Rounding::name##_down(FloatNum x) { \
64  return invoke_mpfr(x, mpfr_##name, GMP_RNDD); \
65  } \
66  FloatNum Rounding::name##_up(FloatNum x) { \
67  return invoke_mpfr(x, mpfr_##name, GMP_RNDU); \
68  }
69  GECODE_GENR_FUNC(exp)
70  GECODE_GENR_FUNC(log)
71  GECODE_GENR_FUNC(sin)
72  GECODE_GENR_FUNC(cos)
73  GECODE_GENR_FUNC(tan)
74  GECODE_GENR_FUNC(asin)
75  GECODE_GENR_FUNC(acos)
76  GECODE_GENR_FUNC(atan)
77  GECODE_GENR_FUNC(sinh)
78  GECODE_GENR_FUNC(cosh)
79  GECODE_GENR_FUNC(tanh)
80  GECODE_GENR_FUNC(asinh)
81  GECODE_GENR_FUNC(acosh)
82  GECODE_GENR_FUNC(atanh)
83 
84 #undef GECODE_GENR_FUNC
85 
86 }}
87 
88 #endif
89 
90 // STATISTICS: float-var
91 
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:249
NNF * r
Right subtree.
Definition: bool-expr.cpp:242
double FloatNum
Floating point number base type.
Definition: float.hh:106
int mpfr_func(mpfr_t, const __mpfr_struct *, mp_rnd_t)
Type signatur of mpfr function.
Definition: rounding.cpp:48
double invoke_mpfr(FloatNum x, mpfr_func f, mp_rnd_t r)
Routine to call mpfr function with proper rounding.
Definition: rounding.cpp:52
#define GECODE_GENR_FUNC(name)
Define mpfr functions with proper rounding.
Definition: rounding.cpp:62
#define forceinline
Definition: config.hpp:192