1
2/* @(#)e_atan2.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 *
13 */
14
15#include <sys/cdefs.h>
16__FBSDID("$FreeBSD: head/lib/msun/src/e_atan2.c 176451 2008-02-22 02:30:36Z das $");
17
18/* __ieee754_atan2(y,x)
19 * Method :
20 * 1. Reduce y to positive by atan2(y,x)=-atan2(-y,x).
21 * 2. Reduce x to positive by (if x and y are unexceptional):
22 * ARG (x+iy) = arctan(y/x) ... if x > 0,
23 * ARG (x+iy) = pi - arctan[y/(-x)] ... if x < 0,
24 *

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