third-party-mirror / mingw-w64 / 79951edef1e76a79d7ce0fa1cf94391b2f6b3d94 / . / mingw-w64-crt / math / softmath / sinf.c

/* | |

This Software is provided under the Zope Public License (ZPL) Version 2.1. | |

Copyright (c) 2014 by the mingw-w64 project | |

See the AUTHORS file for the list of contributors to the mingw-w64 project. | |

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as GPL compatible by the Free Software Foundation (FSF). | |

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Disclaimer | |

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED | |

OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |

OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |

EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT, | |

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*/ | |

#include "softmath_private.h" | |

float sinf(float x) | |

{ | |

float result = 0.0, neg = (x < 0) ? -1 : 1; | |

int n, quadrant; | |

int x_class = fpclassify(x); | |

if (x_class == FP_NAN) | |

{ | |

errno = EDOM; | |

__mingw_raise_matherr (_DOMAIN, "sinf", x, 0.0, x); | |

return x; | |

} | |

else if (x_class == FP_INFINITE) | |

{ | |

errno = EDOM; | |

__mingw_raise_matherr (_DOMAIN, "sinf", x, 0.0, NANF); | |

return NANF; | |

} | |

x *= neg; | |

quadrant = (int)(x / M_PI_2) % 4; | |

x = bsd__ieee754_fmodf(x, M_PI_2); | |

if (quadrant == 1 || quadrant == 3) | |

x = M_PI_2 - x; | |

for(n = 0; n < 5; n++) | |

{ | |

float sign = (n % 2 == 0) ? 1 : -1; | |

result += sign * (bsd__ieee754_powf(x, ((2 * n) + 1)) / softmath_fact((2 * n) + 1)); | |

} | |

if (quadrant == 2 || quadrant == 3) | |

result *= -1; | |

return neg * result; | |

} |