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/* Copyright (C) 1993 Hongjiu Lu
Changed by Olaf Flebbe for long double
This file is part of the Linux C Library.
The Linux C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The Linux C 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
Library General Public License for more details. */
#include <ansidecl.h>
#include <errno.h>
#include <math.h>
long double
DEFUN(acosl, (x), long double x)
{
if (x <= -1.0L ) {
if (x == -1.0L) {
return 3.14159265358979323846L;
}
return __infnanl( EDOM);
}
if (x >= 1.0L ) {
if (x == 1.0L) {
return 0.0L;
}
return __infnanl( EDOM);
}
x = sqrtl ((1.0L - x) / (1.0L + x));
__asm__ __volatile__ ("fpatan"
:"=t" (x) : "0" (1.0L), "u" (x));
return x + x;
}
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