1 /* Complex sine function.  m68k fpu version
2    Copyright (C) 1997-2022 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library.  If not, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #include <complex.h>
20 #include <math.h>
21 #include "mathimpl.h"
22 
23 #define s(name) M_SUF (name)
24 #define m81(func) __m81_u(s(func))
25 
26 CFLOAT
s(__csin)27 s(__csin) (CFLOAT x)
28 {
29   CFLOAT retval;
30   unsigned long rx_cond = __m81_test (__real__ x);
31 
32   if ((rx_cond & (__M81_COND_INF|__M81_COND_NAN)) == 0)
33     {
34       /* Real part is finite.  */
35       FLOAT sin_rx, cos_rx;
36 
37       __asm ("fsincos%.x %2,%1:%0" : "=f" (sin_rx), "=f" (cos_rx)
38 	     : "f" (__real__ x));
39       if (rx_cond & __M81_COND_ZERO)
40 	__real__ retval = __real__ x;
41       else
42 	__real__ retval = sin_rx * m81(__ieee754_cosh) (__imag__ x);
43       __imag__ retval = cos_rx * m81(__ieee754_sinh) (__imag__ x);
44     }
45   else
46     {
47       unsigned long ix_cond = __m81_test (__imag__ x);
48 
49       __real__ retval = __real__ x - __real__ x;
50       if (ix_cond & (__M81_COND_ZERO|__M81_COND_INF|__M81_COND_NAN))
51 	__imag__ retval = __imag__ x;
52       else
53 	__imag__ retval = __real__ retval;
54     }
55 
56   return retval;
57 }
58 declare_mgen_alias (__csin, csin)
59