/usr/share/sdcc/lib/src/sincoshf.c is in sdcc-libraries 2.9.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | /* sincoshf.c: Computes sinh or cosh of a 32-bit float as outlined in [1]
Copyright (C) 2001, 2002 Jesus Calvino-Fraga, jesusc@ieee.org
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* [1] William James Cody and W. M. Waite. _Software manual for the
elementary functions_, Englewood Cliffs, N.J.:Prentice-Hall, 1980. */
/* Version 1.0 - Initial release */
#include <math.h>
#include <errno.h>
#include <stdbool.h>
#define P0 -0.713793159E+1
#define P1 -0.190333999E+0
#define Q0 -0.428277109E+2
#define Q1 0.100000000E+1
#define P(z) (P1*z+P0)
#define Q(z) (Q1*z+Q0)
#define K1 0.69316101074218750000E+0 /* ln(v) */
#define K2 0.24999308500451499336E+0 /* v**(-2) */
#define K3 0.13830277879601902638E-4 /* v/2-1 */
//WMAX is defined as ln(HUGE_VALF)-ln(v)+0.69
#define WMAX 44.93535952E+0
//WBAR 0.35*(b+1)
#define WBAR 1.05
#define YBAR 9.0 /*Works for me*/
float sincoshf(const float x, const int iscosh)
{
float y, w, z;
BOOL sign;
if (x<0.0) { y=-x; sign=1; }
else { y=x; sign=0; }
if ((y>1.0) || iscosh)
{
if(y>YBAR)
{
w=y-K1;
if (w>WMAX)
{
errno=ERANGE;
z=HUGE_VALF;
}
else
{
z=expf(w);
z+=K3*z;
}
}
else
{
z=expf(y);
w=1.0/z;
if(!iscosh) w=-w;
z=(z+w)*0.5;
}
if(sign) z=-z;
}
else
{
if (y<EPS)
z=x;
else
{
z=x*x;
z=x+x*z*P(z)/Q(z);
}
}
return z;
}
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