/usr/share/sdcc/lib/src/asincosf.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 | /* asincosf.c: Computes asin or acos 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>
#define P1 0.933935835E+0
#define P2 -0.504400557E+0
#define Q0 0.560363004E+1
#define Q1 -0.554846723E+1
#define Q2 0.100000000E+1
#define P(g) (P2*g+P1)
#define Q(g) ((Q2*g+Q1)*g+Q0)
#ifdef SDCC_mcs51
#define myconst __code
#else
#define myconst const
#endif
float asincosf(const float x, const int isacos)
{
float y, g, r;
int i;
static myconst float a[2]={ 0.0, QUART_PI };
static myconst float b[2]={ HALF_PI, QUART_PI };
y=fabsf(x);
i=isacos;
if (y < EPS) r=y;
else
{
if (y > 0.5)
{
i=1-i;
if (y > 1.0)
{
errno=EDOM;
return 0.0;
}
g=(0.5-y)+0.5;
g=ldexpf(g,-1);
y=sqrtf(g);
y=-(y+y);
}
else
{
g=y*y;
}
r=y+y*((P(g)*g)/Q(g));
}
if (isacos)
{
if (x < 0.0)
r=(b[i]+r)+b[i];
else
r=(a[i]-r)+a[i];
}
else
{
r=(a[i]+r)+a[i];
if (x<0.0) r=-r;
}
return r;
}
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