| /* Copyright (C) 1997-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C 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. |
| |
| The GNU 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <math.h> |
| #include <math_private.h> |
| #include "mathimpl.h" |
| |
| #ifndef SUFF |
| #define SUFF |
| #endif |
| #ifndef float_type |
| #define float_type double |
| #endif |
| |
| #define CONCATX(a,b) __CONCAT(a,b) |
| #define s(name) CONCATX(name,SUFF) |
| #define m81(func) __m81_u(s(func)) |
| |
| float_type |
| s(__ieee754_atan2) (float_type y, float_type x) |
| { |
| float_type pi, pi_2, z; |
| unsigned long y_cond, x_cond; |
| |
| __asm ("fmovecr%.x %#0, %0" : "=f" (pi)); |
| __asm ("fscale%.w %#-1, %0" : "=f" (pi_2) : "0" (pi)); |
| y_cond = __m81_test (y); |
| x_cond = __m81_test (x); |
| |
| if ((x_cond | y_cond) & __M81_COND_NAN) |
| z = x + y; |
| else if (y_cond & __M81_COND_ZERO) |
| { |
| if (x_cond & __M81_COND_NEG) |
| z = y_cond & __M81_COND_NEG ? -pi : pi; |
| else |
| z = y; |
| } |
| else if (x_cond & __M81_COND_INF) |
| { |
| if (y_cond & __M81_COND_INF) |
| { |
| float_type pi_4; |
| __asm ("fscale%.w %#-2, %0" : "=f" (pi_4) : "0" (pi)); |
| z = x_cond & __M81_COND_NEG ? 3 * pi_4 : pi_4; |
| } |
| else |
| z = x_cond & __M81_COND_NEG ? pi : 0; |
| if (y_cond & __M81_COND_NEG) |
| z = -z; |
| } |
| else if (y_cond & __M81_COND_INF) |
| z = y_cond & __M81_COND_NEG ? -pi_2 : pi_2; |
| else if (x_cond & __M81_COND_NEG) |
| { |
| if (y_cond & __M81_COND_NEG) |
| { |
| if (-x > -y) |
| z = -pi + m81(__atan) (y / x); |
| else |
| z = -pi_2 - m81(__atan) (x / y); |
| } |
| else |
| { |
| if (-x > y) |
| z = pi + m81(__atan) (y / x); |
| else |
| z = pi_2 - m81(__atan) (x / y); |
| } |
| } |
| else |
| { |
| if (y_cond & __M81_COND_NEG) |
| { |
| if (x > -y) |
| z = m81(__atan) (y / x); |
| else |
| z = -pi_2 - m81(__atan) (x / y); |
| } |
| else |
| { |
| if (x > y) |
| z = m81(__atan) (y / x); |
| else |
| z = pi_2 - m81(__atan) (x / y); |
| } |
| } |
| return z; |
| } |
| strong_alias (s(__ieee754_atan2), CONCATX (s (__atan2), _finite)) |
