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1 | /* |

2 | * Copyright (c) 1992, 1993 | |

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3 | * The Regents of the University of California. All rights reserved. |

4 | * | |

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5 | * This software was developed by the Computer Systems Engineering group |

6 | * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and | |

7 | * contributed to Berkeley. | |

8 | * | |

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9 | * Redistribution and use in source and binary forms, with or without |

10 | * modification, are permitted provided that the following conditions | |

11 | * are met: | |

12 | * 1. Redistributions of source code must retain the above copyright | |

13 | * notice, this list of conditions and the following disclaimer. | |

14 | * 2. Redistributions in binary form must reproduce the above copyright | |

15 | * notice, this list of conditions and the following disclaimer in the | |

16 | * documentation and/or other materials provided with the distribution. | |

05ecdcef | 17 | * 3. Neither the name of the University nor the names of its contributors |

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18 | * may be used to endorse or promote products derived from this software |

19 | * without specific prior written permission. | |

20 | * | |

21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |

22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |

23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |

24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |

25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |

26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |

27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |

28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |

29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |

30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |

31 | * SUCH DAMAGE. | |

32 | * | |

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33 | * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp |

34 | * $NetBSD: isinfl.c,v 1.5 2004/03/04 23:42:39 kleink Exp $ | |

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35 | */ |

36 | ||

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37 | #include <machine/ieee.h> |

38 | #include <math.h> | |

17030342 | 39 | |

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40 | /* |

41 | * 7.12.3.3 isinf - test for infinity | |

42 | * IEEE 754 compatible 80-bit extended-precision Intel 386 version | |

43 | */ | |

17030342 | 44 | int |

05ecdcef | 45 | __isinfl(long double x) |

17030342 | 46 | { |

05ecdcef | 47 | union ieee_ext_u u; |

17030342 | 48 | |

05ecdcef | 49 | u.extu_ld = x; |

17030342 | 50 | |

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51 | return (u.extu_ext.ext_exp == EXT_EXP_INFNAN && |

52 | (u.extu_ext.ext_int == 1 && | |

53 | u.extu_ext.ext_frach == 0 && u.extu_ext.ext_fracl == 0)); | |

17030342 | 54 | } |