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Annotation of OpenXM_contrib/gmp/mpfr/minmax.c, Revision 1.1.1.1

1.1       ohara       1: /* mpfr_min -- min and max of x, y
                      2:
                      3: Copyright 2001 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the MPFR Library.
                      6:
                      7: The MPFR Library is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU Lesser General Public License as published by
                      9: the Free Software Foundation; either version 2.1 of the License, or (at your
                     10: option) any later version.
                     11:
                     12: The MPFR Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Lesser General Public License
                     18: along with the MPFR Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include "gmp.h"
                     23: #include "gmp-impl.h"
                     24: #include "mpfr.h"
                     25: #include "mpfr-impl.h"
                     26:
                     27:  /* The computation of z=min(x,y)
                     28:
                     29:     z=x if x <= y
                     30:     z=y if x > y
                     31:  */
                     32:
                     33: int
                     34: mpfr_min (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mp_rnd_t rnd_mode)
                     35: {
                     36:   if (MPFR_IS_NAN(x) && MPFR_IS_NAN(y) )
                     37:     {
                     38:       MPFR_SET_NAN(z);
                     39:       MPFR_RET_NAN;
                     40:     }
                     41:   MPFR_CLEAR_NAN(z);
                     42:
                     43:   if (MPFR_IS_NAN(x))
                     44:     return mpfr_set(z, y, rnd_mode);
                     45:
                     46:   if (MPFR_IS_NAN(y))
                     47:     return mpfr_set(z, x, rnd_mode);
                     48:
                     49:   if (MPFR_IS_FP(x) && MPFR_IS_ZERO(x) && MPFR_IS_FP(y) && MPFR_IS_ZERO(y))
                     50:     {
                     51:       if (MPFR_SIGN(x) < 0)
                     52:         return mpfr_set(z, x, rnd_mode);
                     53:       else
                     54:         return mpfr_set(z, y, rnd_mode);
                     55:     }
                     56:
                     57:   if (mpfr_cmp(x,y) <= 0)
                     58:     return mpfr_set(z, x, rnd_mode);
                     59:   else
                     60:     return mpfr_set(z, y, rnd_mode);
                     61: }
                     62:
                     63:  /* The computation of z=max(x,y)
                     64:
                     65:     z=x if x >= y
                     66:     z=y if x < y
                     67:  */
                     68:
                     69: int
                     70: mpfr_max (mpfr_ptr z, mpfr_srcptr x, mpfr_srcptr y, mp_rnd_t rnd_mode)
                     71: {
                     72:   if (MPFR_IS_NAN(x) && MPFR_IS_NAN(y) )
                     73:     {
                     74:       MPFR_SET_NAN(z);
                     75:       MPFR_RET_NAN;
                     76:     }
                     77:   MPFR_CLEAR_NAN(z);
                     78:
                     79:   if (MPFR_IS_NAN(x))
                     80:     return mpfr_set(z, y, rnd_mode);
                     81:
                     82:   if (MPFR_IS_NAN(y))
                     83:     return mpfr_set(z, x, rnd_mode);
                     84:
                     85:   if (MPFR_IS_FP(x) && MPFR_IS_ZERO(x) && MPFR_IS_FP(y) && MPFR_IS_ZERO(y))
                     86:     {
                     87:       if (MPFR_SIGN(x) < 0)
                     88:         return mpfr_set(z, y, rnd_mode);
                     89:       else
                     90:         return mpfr_set(z, x, rnd_mode);
                     91:     }
                     92:
                     93:   if (mpfr_cmp(x,y) <= 0)
                     94:     return mpfr_set(z, y, rnd_mode);
                     95:   else
                     96:     return mpfr_set(z, x, rnd_mode);
                     97: }