1997-03-25 01:31:06 +00:00
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/* Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#define __LIBC_M81_MATH_INLINES
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#include <math.h>
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#include "math_private.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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float_type
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__CONCATX(__ieee754_atan2,SUFF) (float_type y, float_type x)
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{
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float_type pi, pi_2, z;
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__asm ("fmovecr%.x %#0, %0" : "=f" (pi));
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__asm ("fscale%.w %#-1, %0" : "=f" (pi_2) : "0" (pi));
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if (x != x || y != y)
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z = x + y;
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else if (y == 0)
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{
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if (signbit (x))
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z = signbit (y) ? -pi : pi;
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else
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z = y;
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}
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else if (__m81_u(__CONCATX(__isinf,SUFF)) (x))
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{
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if (__m81_u(__CONCATX(__isinf,SUFF)) (y))
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{
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float_type pi_4;
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__asm ("fscale%.w %#-1, %0" : "=f" (pi_4) : "0" (pi_2));
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z = x > 0 ? pi_4 : 3 * pi_4;
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}
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else
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z = x > 0 ? 0 : pi;
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if (signbit (y))
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z = -z;
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}
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else if (__m81_u(__CONCATX(__isinf,SUFF)) (y))
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z = y > 0 ? pi_2 : -pi_2;
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else if (x > 0)
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{
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if (y > 0)
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{
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if (x > y)
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z = __m81_u(__CONCATX(__atan,SUFF)) (y / x);
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else
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z = pi_2 - __m81_u(__CONCATX(__atan,SUFF)) (x / y);
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}
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else
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{
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if (x > -y)
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z = __m81_u(__CONCATX(__atan,SUFF)) (y / x);
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else
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z = -pi_2 - __m81_u(__CONCATX(__atan,SUFF)) (x / y);
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}
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}
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else
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{
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if (y < 0)
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{
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if (-x > y)
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z = -pi + __m81_u(__CONCATX(__atan,SUFF)) (y / x);
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else
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z = -pi_2 - __m81_u(__CONCATX(__atan,SUFF)) (x / y);
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}
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else
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{
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if (-x > y)
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z = pi + __m81_u(__CONCATX(__atan,SUFF)) (y / x);
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else
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z = pi_2 - __m81_u(__CONCATX(__atan,SUFF)) (x / y);
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}
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}
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return z;
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}
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