projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| a2a2059f BD |
1 | /* Implementation of various C99 functions |
| 2 | Copyright (C) 2004 Free Software Foundation, Inc. | |
| 3 | ||
| 4 | This file is part of the GNU Fortran 95 runtime library (libgfortran). | |
| 5 | ||
| 6 | Libgfortran is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Lesser General Public | |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | Libgfortran is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | GNU Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 17 | License along with libgfortran; see the file COPYING.LIB. If not, | |
| 18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 19 | Boston, MA 02111-1307, USA. */ | |
| 20 | ||
| 21 | #include "config.h" | |
| 22 | #include <sys/types.h> | |
| 23 | #include <math.h> | |
| 24 | #include "libgfortran.h" | |
| 25 | ||
| 26 | ||
| 27 | /* Algorithm by Steven G. Kargl. */ | |
| 28 | ||
| 29 | #ifndef HAVE_ROUND | |
| 30 | /* Round to nearest integral value. If the argument is halfway between two | |
| 31 | integral values then round away from zero. */ | |
| 32 | ||
| 33 | double | |
| 34 | round(double x) | |
| 35 | { | |
| 36 | double t; | |
| 37 | int i; | |
| 38 | ||
| 39 | i = fpclassify(x); | |
| 40 | if (i == FP_INFINITE || i == FP_NAN) | |
| 41 | return (x); | |
| 42 | ||
| 43 | if (x >= 0.0) | |
| 44 | { | |
| 45 | t = ceil(x); | |
| 46 | if (t - x > 0.5) | |
| 47 | t -= 1.0; | |
| 48 | return (t); | |
| 49 | } | |
| 50 | else | |
| 51 | { | |
| 52 | t = ceil(-x); | |
| 53 | if (t + x > 0.5) | |
| 54 | t -= 1.0; | |
| 55 | return (-t); | |
| 56 | } | |
| 57 | } | |
| 58 | #endif | |
| 59 | ||
| 60 | #ifndef HAVE_ROUNDF | |
| 61 | /* Round to nearest integral value. If the argument is halfway between two | |
| 62 | integral values then round away from zero. */ | |
| 63 | ||
| 64 | float | |
| 65 | roundf(float x) | |
| 66 | { | |
| 67 | float t; | |
| 68 | int i; | |
| 69 | ||
| 70 | i = fpclassify(x); | |
| 71 | if (i == FP_INFINITE || i == FP_NAN) | |
| 72 | return (x); | |
| 73 | ||
| 74 | if (x >= 0.0) | |
| 75 | { | |
| 76 | t = ceilf(x); | |
| 77 | if (t - x > 0.5) | |
| 78 | t -= 1.0; | |
| 79 | return (t); | |
| 80 | } | |
| 81 | else | |
| 82 | { | |
| 83 | t = ceilf(-x); | |
| 84 | if (t + x > 0.5) | |
| 85 | t -= 1.0; | |
| 86 | return (-t); | |
| 87 | } | |
| 88 | } | |
| 89 | #endif | |
| 90 |