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74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* Complex cosine function. m68k fpu version
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Copyright (C) 1997, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <complex.h>
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#include <math.h>
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#include "mathimpl.h"
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#ifndef SUFF
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#define SUFF
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#endif
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#ifndef float_type
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#define float_type double
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#endif
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#define CONCATX(a,b) __CONCAT(a,b)
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#define s(name) CONCATX(name,SUFF)
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#define m81(func) __m81_u(s(func))
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__complex__ float_type
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s(__ccos) (__complex__ float_type x)
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{
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__complex__ float_type retval;
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unsigned long rx_cond = __m81_test (__real__ x);
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if ((rx_cond & (__M81_COND_INF|__M81_COND_NAN)) == 0)
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{
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/* Real part is finite. */
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float_type sin_rx, cos_rx;
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__asm ("fsincos%.x %2,%1:%0" : "=f" (sin_rx), "=f" (cos_rx)
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: "f" (__real__ x));
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__real__ retval = cos_rx * m81(__ieee754_cosh) (__imag__ x);
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if (rx_cond & __M81_COND_ZERO)
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__imag__ retval = (m81(__signbit) (__imag__ x)
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? __real__ x : -__real__ x);
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else
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__imag__ retval = -sin_rx * m81(__ieee754_sinh) (__imag__ x);
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}
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else
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{
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unsigned long ix_cond = __m81_test (__imag__ x);
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if (ix_cond & __M81_COND_INF)
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__real__ retval = s(fabs) (__imag__ x);
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else
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__real__ retval = __real__ x - __real__ x;
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if (ix_cond & __M81_COND_ZERO)
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__imag__ retval = __imag__ x;
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else
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__imag__ retval = __real__ x - __real__ x;
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}
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return retval;
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}
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#define weak_aliasx(a,b) weak_alias(a,b)
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weak_aliasx (s(__ccos), s(ccos))
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