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annotate packages/language/c/libm/current/src/double/portable-api/s_ldexp.c @ 64:c38311975d4f ecos-sw-2000-01-28

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Merge from eCos master repository on 2000-01-28-04:28:11-GMT
author jlarmour
date Fri, 28 Jan 2000 04:59:39 +0000
parents 443894e2e912
children bf00f99aec69
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1 //===========================================================================
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2 //
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3 // s_ldexp.c
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4 //
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5 // Part of the standard mathematical function library
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6 //
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7 //===========================================================================
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8 //####COPYRIGHTBEGIN####
64
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.0 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://sourceware.cygnus.com/ecos
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15 //
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16 // Software distributed under the License is distributed on an
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
0
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30 //####COPYRIGHTEND####
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31 //===========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors: jlarmour
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36 // Date: 1998-02-13
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37 // Purpose:
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38 // Description:
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39 // Usage:
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //===========================================================================
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44
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45 // CONFIGURATION
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46
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47 #include <pkgconf/libm.h> // Configuration header
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48
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49 // Include the Math library?
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50 #ifdef CYGPKG_LIBM
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51
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52 // Derived from code with the following copyright
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53
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54
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55 /* @(#)s_ldexp.c 1.3 95/01/18 */
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56 /*
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57 * ====================================================
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58 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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59 *
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60 * Developed at SunSoft, a Sun Microsystems, Inc. business.
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61 * Permission to use, copy, modify, and distribute this
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62 * software is freely granted, provided that this notice
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63 * is preserved.
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64 * ====================================================
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65 */
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66
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67 #include "mathincl/fdlibm.h"
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68
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69 double
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70 ldexp(double x, int exp)
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71 {
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72 double z;
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73
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74 z = scalbn(x,exp);
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75
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76 #ifndef CYGSEM_LIBM_COMPAT_IEEE_ONLY
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77 if(cyg_libm_get_compat_mode() == CYGNUM_LIBM_COMPAT_IEEE) return z;
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78 if(!(finite(z)||isnan(z))&&finite(x)) {
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79 return __kernel_standard(x,(double)exp,43); /* ldexp overflow */
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80 }
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81 if(z==0.0&&z!=x) {
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82 return __kernel_standard(x,(double)exp,44); /* ldexp underflow */
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83 }
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84 #endif
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85
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86 return z;
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87 }
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88
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89 #endif // ifdef CYGPKG_LIBM
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90
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91 // EOF s_ldexp.c