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1 /* Compute projection of complex float type value to Riemann sphere.
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2 Copyright (C) 1997-2018 Free Software Foundation, Inc.
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3 This file is part of the GNU C Library.
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4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5
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6 The GNU C Library is free software; you can redistribute it and/or
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7 modify it under the terms of the GNU Lesser General Public
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 License as published by the Free Software Foundation; either
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9 version 2.1 of the License, or (at your option) any later version.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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10
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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11 The GNU C Library is distributed in the hope that it will be useful,
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14 Lesser General Public License for more details.
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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15
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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16 You should have received a copy of the GNU Lesser General Public
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17 License along with the GNU C Library; if not, see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "quadmath-imp.h"
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21
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22 __complex128
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23 cprojq (__complex128 x)
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24 {
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25 if (isinfq (__real__ x) || isinfq (__imag__ x))
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26 {
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27 __complex128 res;
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28
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29 __real__ res = __builtin_inf ();
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30 __imag__ res = copysignq (0, __imag__ x);
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31
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32 return res;
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33 }
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34
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35 return x;
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36 }
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