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Diffstat (limited to 'sysdeps/generic/tan.c')
| -rw-r--r-- | sysdeps/generic/tan.c | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/sysdeps/generic/tan.c b/sysdeps/generic/tan.c deleted file mode 100644 index 61ed5c55c7..0000000000 --- a/sysdeps/generic/tan.c +++ /dev/null @@ -1,74 +0,0 @@ -/* - * Copyright (c) 1987, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#ifndef lint -static char sccsid[] = "@(#)tan.c 8.1 (Berkeley) 6/4/93"; -#endif /* not lint */ - -#include "trig.h" -double -tan(x) -double x; -{ - double a,z,ss,cc,c; - int k; - - if(!finite(x)) /* tan(NaN) and tan(INF) must be NaN */ - return x-x; - x = drem(x,PI); /* reduce x into [-PI/2, PI/2] */ - a = copysign(x,one); /* ... = abs(x) */ - if (a >= PIo4) { - k = 1; - x = copysign(PIo2-a,x); - } - else { - k = 0; - if (a < small) { - big+a; - return x; - } - } - z = x*x; - cc = cos__C(z); - ss = sin__S(z); - z *= half; /* Next get c = cos(x) accurately */ - c = (z >= thresh ? half-((z-half)-cc) : one-(z-cc)); - if (k == 0) - return x+(x*(z-(cc-ss)))/c; /* ... sin/cos */ -#ifdef national - else if (x == zero) - return copysign(fmax,x); /* no inf on 32k */ -#endif /* national */ - else - return c/(x+x*ss); /* ... cos/sin */ -} |