chromium / native_client / nacl-gcc / f80d6b9ee7f94755c697ffb7194fb01dd0c537dd / . / mpfr-2.4.1 / set_prec.c

/* mpfr_set_prec -- reset the precision of a floating-point number | |

Copyright 1999, 2001, 2002, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. | |

Contributed by the Arenaire and Cacao projects, INRIA. | |

This file is part of the GNU MPFR Library. | |

The GNU MPFR Library is free software; you can redistribute it and/or modify | |

it under the terms of the GNU Lesser General Public License as published by | |

the Free Software Foundation; either version 2.1 of the License, or (at your | |

option) any later version. | |

The GNU MPFR Library is distributed in the hope that it will be useful, but | |

WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |

or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public | |

License for more details. | |

You should have received a copy of the GNU Lesser General Public License | |

along with the GNU MPFR Library; see the file COPYING.LIB. If not, write to | |

the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |

MA 02110-1301, USA. */ | |

#include "mpfr-impl.h" | |

void | |

mpfr_set_prec (mpfr_ptr x, mpfr_prec_t p) | |

{ | |

mp_size_t xsize, xoldsize; | |

mp_ptr tmp; | |

/* first, check if p is correct */ | |

MPFR_ASSERTN (p >= MPFR_PREC_MIN && p <= MPFR_PREC_MAX); | |

/* Calculate the new number of limbs */ | |

xsize = (p - 1) / BITS_PER_MP_LIMB + 1; | |

/* Realloc only if the new size is greater than the old */ | |

xoldsize = MPFR_GET_ALLOC_SIZE (x); | |

if (xsize > xoldsize) | |

{ | |

tmp = (mp_ptr) (*__gmp_reallocate_func) | |

(MPFR_GET_REAL_PTR(x), MPFR_MALLOC_SIZE(xoldsize), MPFR_MALLOC_SIZE(xsize)); | |

MPFR_SET_MANT_PTR(x, tmp); | |

MPFR_SET_ALLOC_SIZE(x, xsize); | |

} | |

MPFR_PREC (x) = p; | |

MPFR_SET_NAN (x); /* initializes to NaN */ | |

} | |

#undef mpfr_get_prec | |

mp_prec_t | |

mpfr_get_prec (mpfr_srcptr x) | |

{ | |

return MPFR_PREC(x); | |

} |