/* Copyright (C) 1989-2021 Free Software Foundation, Inc. | |

This file is part of GCC. | |

GCC is free software; you can redistribute it and/or modify it under | |

the terms of the GNU General Public License as published by the Free | |

Software Foundation; either version 3, or (at your option) any later | |

version. | |

GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |

WARRANTY; without even the implied warranty of MERCHANTABILITY or | |

FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |

for more details. | |

Under Section 7 of GPL version 3, you are granted additional | |

permissions described in the GCC Runtime Library Exception, version | |

3.1, as published by the Free Software Foundation. | |

You should have received a copy of the GNU General Public License and | |

a copy of the GCC Runtime Library Exception along with this program; | |

see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |

<http://www.gnu.org/licenses/>. */ | |

/* This is a temporary specialization of code from libgcc/libgcc2.c. */ | |

#include "soft-fp.h" | |

#include "quad-float128.h" | |

#define COPYSIGN(x,y) __builtin_copysignf128 (x, y) | |

#define INFINITY __builtin_inff128 () | |

#define isnan __builtin_isnan | |

#define isinf __builtin_isinf | |

#if defined(FLOAT128_HW_INSNS) && !defined(__mulkc3) | |

#define __mulkc3 __mulkc3_sw | |

#endif | |

TCtype | |

__mulkc3 (TFtype a, TFtype b, TFtype c, TFtype d) | |

{ | |

TFtype ac, bd, ad, bc, x, y; | |

TCtype res; | |

ac = a * c; | |

bd = b * d; | |

ad = a * d; | |

bc = b * c; | |

x = ac - bd; | |

y = ad + bc; | |

if (isnan (x) && isnan (y)) | |

{ | |

/* Recover infinities that computed as NaN + iNaN. */ | |

_Bool recalc = 0; | |

if (isinf (a) || isinf (b)) | |

{ | |

/* z is infinite. "Box" the infinity and change NaNs in | |

the other factor to 0. */ | |

a = COPYSIGN (isinf (a) ? 1 : 0, a); | |

b = COPYSIGN (isinf (b) ? 1 : 0, b); | |

if (isnan (c)) c = COPYSIGN (0, c); | |

if (isnan (d)) d = COPYSIGN (0, d); | |

recalc = 1; | |

} | |

if (isinf (c) || isinf (d)) | |

{ | |

/* w is infinite. "Box" the infinity and change NaNs in | |

the other factor to 0. */ | |

c = COPYSIGN (isinf (c) ? 1 : 0, c); | |

d = COPYSIGN (isinf (d) ? 1 : 0, d); | |

if (isnan (a)) a = COPYSIGN (0, a); | |

if (isnan (b)) b = COPYSIGN (0, b); | |

recalc = 1; | |

} | |

if (!recalc | |

&& (isinf (ac) || isinf (bd) | |

|| isinf (ad) || isinf (bc))) | |

{ | |

/* Recover infinities from overflow by changing NaNs to 0. */ | |

if (isnan (a)) a = COPYSIGN (0, a); | |

if (isnan (b)) b = COPYSIGN (0, b); | |

if (isnan (c)) c = COPYSIGN (0, c); | |

if (isnan (d)) d = COPYSIGN (0, d); | |

recalc = 1; | |

} | |

if (recalc) | |

{ | |

x = INFINITY * (a * c - b * d); | |

y = INFINITY * (a * d + b * c); | |

} | |

} | |

__real__ res = x; | |

__imag__ res = y; | |

return res; | |

} | |