1 | /* |
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2 | (C) Copyright IBM Corp. 2009 |
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3 | |
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4 | All rights reserved. |
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5 | |
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6 | Redistribution and use in source and binary forms, with or without |
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7 | modification, are permitted provided that the following conditions are met: |
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8 | |
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9 | * Redistributions of source code must retain the above copyright notice, |
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10 | this list of conditions and the following disclaimer. |
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11 | * Redistributions in binary form must reproduce the above copyright |
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12 | notice, this list of conditions and the following disclaimer in the |
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13 | documentation and/or other materials provided with the distribution. |
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14 | * Neither the name of IBM nor the names of its contributors may be |
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15 | used to endorse or promote products derived from this software without |
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16 | specific prior written permission. |
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17 | |
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18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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19 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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20 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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21 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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22 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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23 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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24 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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25 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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26 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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27 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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28 | POSSIBILITY OF SUCH DAMAGE. |
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29 | */ |
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30 | |
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31 | #include <math.h> |
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32 | #include <errno.h> |
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33 | #include "fdlibm.h" |
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34 | |
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35 | long double |
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36 | hypotl (long double x, long double y) |
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37 | { |
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38 | #ifdef _LDBL_EQ_DBL |
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39 | |
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40 | /* On platforms where long double is as wide as double. */ |
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41 | return hypot(x, y); |
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42 | |
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43 | #else |
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44 | |
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45 | long double z; |
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46 | |
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47 | z = __ieee754_hypotl (x, y); |
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48 | |
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49 | if (_LIB_VERSION == _IEEE_) |
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50 | return z; |
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51 | |
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52 | if ((! finitel (z)) && finitel (x) && finitel (y)) |
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53 | { |
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54 | /* hypot (finite, finite) overflow. */ |
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55 | struct exception exc; |
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56 | |
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57 | exc.type = OVERFLOW; |
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58 | exc.name = "hypotl"; |
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59 | exc.err = 0; |
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60 | exc.arg1 = x; |
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61 | exc.arg2 = y; |
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62 | |
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63 | if (_LIB_VERSION == _SVID_) |
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64 | exc.retval = HUGE; |
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65 | else |
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66 | { |
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67 | #ifndef HUGE_VAL |
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68 | #define HUGE_VAL inf |
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69 | double inf = 0.0; |
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70 | |
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71 | SET_HIGH_WORD (inf, 0x7ff00000); /* Set inf to infinite. */ |
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72 | #endif |
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73 | exc.retval = HUGE_VAL; |
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74 | } |
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75 | |
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76 | if (_LIB_VERSION == _POSIX_) |
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77 | errno = ERANGE; |
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78 | else if (! matherr (& exc)) |
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79 | errno = ERANGE; |
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80 | |
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81 | if (exc.err != 0) |
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82 | errno = exc.err; |
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83 | |
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84 | return (long double) exc.retval; |
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85 | } |
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86 | |
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87 | return z; |
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88 | #endif /* ! _LDBL_EQ_DBL */ |
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89 | } |
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