95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* Copyright (C) 1989-2017 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This is a temporary specialization of code from libgcc/libgcc2.c. */
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typedef float KFtype __attribute__ ((mode (KF)));
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typedef __complex float KCtype __attribute__ ((mode (KC)));
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#define COPYSIGN(x,y) __builtin_copysignq (x, y)
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#define INFINITY __builtin_infq ()
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#define isnan __builtin_isnan
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#define isinf __builtin_isinf
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KCtype
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__mulkc3 (KFtype a, KFtype b, KFtype c, KFtype d)
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{
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KFtype ac, bd, ad, bc, x, y;
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KCtype res;
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ac = a * c;
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bd = b * d;
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ad = a * d;
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bc = b * c;
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x = ac - bd;
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y = ad + bc;
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if (isnan (x) && isnan (y))
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{
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/* Recover infinities that computed as NaN + iNaN. */
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_Bool recalc = 0;
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if (isinf (a) || isinf (b))
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{
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/* z is infinite. "Box" the infinity and change NaNs in
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the other factor to 0. */
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a = COPYSIGN (isinf (a) ? 1 : 0, a);
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b = COPYSIGN (isinf (b) ? 1 : 0, b);
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if (isnan (c)) c = COPYSIGN (0, c);
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if (isnan (d)) d = COPYSIGN (0, d);
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recalc = 1;
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}
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if (isinf (c) || isinf (d))
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{
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/* w is infinite. "Box" the infinity and change NaNs in
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the other factor to 0. */
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c = COPYSIGN (isinf (c) ? 1 : 0, c);
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d = COPYSIGN (isinf (d) ? 1 : 0, d);
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if (isnan (a)) a = COPYSIGN (0, a);
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if (isnan (b)) b = COPYSIGN (0, b);
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recalc = 1;
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}
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if (!recalc
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&& (isinf (ac) || isinf (bd)
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|| isinf (ad) || isinf (bc)))
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{
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/* Recover infinities from overflow by changing NaNs to 0. */
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if (isnan (a)) a = COPYSIGN (0, a);
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if (isnan (b)) b = COPYSIGN (0, b);
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if (isnan (c)) c = COPYSIGN (0, c);
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if (isnan (d)) d = COPYSIGN (0, d);
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recalc = 1;
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}
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if (recalc)
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{
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x = INFINITY * (a * c - b * d);
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y = INFINITY * (a * d + b * c);
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}
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}
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__real__ res = x;
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__imag__ res = y;
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return res;
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}
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