/* @(#)s_sin.c 5.1 93/09/24 */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ #if defined(LIBM_SCCS) && !defined(lint) static char rcsid[] = "$NetBSD: s_sin.c,v 1.7 1995/05/10 20:48:15 jtc Exp $"; #endif /* sin(x) * Return sine function of x. * * kernel function: * __kernel_sin ... sine function on [-pi/4,pi/4] * __kernel_cos ... cose function on [-pi/4,pi/4] * __ieee754_rem_pio2 ... argument reduction routine * * Method. * Let S,C and T denote the sin, cos and tan respectively on * [-PI/4, +PI/4]. Reduce the argument x to y1+y2 = x-k*pi/2 * in [-pi/4 , +pi/4], and let n = k mod 4. * We have * * n sin(x) cos(x) tan(x) * ---------------------------------------------------------- * 0 S C T * 1 C -S -1/T * 2 -S -C T * 3 -C S -1/T * ---------------------------------------------------------- * * Special cases: * Let trig be any of sin, cos, or tan. * trig(+-INF) is NaN, with signals; * trig(NaN) is that NaN; * * Accuracy: * TRIG(x) returns trig(x) nearly rounded */ #include "math.h" #include "math_private.h" #ifdef __STDC__ double sin(double x) #else double sin(x) double x; #endif { double y[2],z=0.0; int32_t n, ix; /* High word of x. */ GET_HIGH_WORD(ix,x); /* |x| ~< pi/4 */ ix &= 0x7fffffff; if(ix <= 0x3fe921fb) return __kernel_sin(x,z,0); /* sin(Inf or NaN) is NaN */ else if (ix>=0x7ff00000) return x-x; /* argument reduction needed */ else { n = __ieee754_rem_pio2(x,y); switch(n&3) { case 0: return __kernel_sin(y[0],y[1],1); case 1: return __kernel_cos(y[0],y[1]); case 2: return -__kernel_sin(y[0],y[1],1); default: return -__kernel_cos(y[0],y[1]); } } }
| Age | Commit message (Collapse) | Author | |
|---|---|---|---|
| 2009-07-20 | ssh has moved | christos | |
| 2009-02-17 | link in fmt_scaled.c | mrg | |
| 2008-08-29 | Wrap compiler-specific flags with HAVE_GCC and HAVE_PCC as necessary. Add a ↵ | gmcgarry | |
| few flags for PCC. | |||
| 2006-05-11 | sprinkle some -fno-strict-aliasing and -Wno-pointer-sign with GCC4. | mrg | |
| 2005-04-23 | sftp now uses libedit. | christos | |
| 2005-02-13 | Update for OpenSSH-3.9 | christos | |
| 2005-01-03 | Style/consistency cleanup: | lukem | |
| * libcrypto & libz are provided by ../Makefile.inc * <bsd.own.mk> isn't required by most of these * be consistent in the layout | |||
| 2002-09-18 | rcsid fix | lukem | |
| 2002-08-02 | Don't set BINOWN if using the default BINMODE. | simonb | |
| 2002-06-24 | tidy up makefiles | itojun | |
| 2002-03-08 | sync w/ 3.1 as of 2002/3/8. configuration file directory is still /etc | itojun | |
| (openbsd usr.bin/ssh is using /etc/ssh) | |||
| 2001-03-19 | sync with openssh 2.5.2 (from openbsd usr.bin/ssh, not from portable). | itojun | |
| 2001-02-07 | sync crypto/dist/ssh with re-importorted tree. try to minimize diffs | itojun | |
| with openssh tree to ease future upgrade. re-do local changes, including: - prototype pedants - IgnoreRootRhosts - login.conf user validation some of the local changes that weren't used are omitted for now. we may need to revisit those afterwards. it adds "sftp". | |||