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author | Ulrich Drepper <drepper@redhat.com> | 1999-07-14 00:54:57 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 1999-07-14 00:54:57 +0000 |
commit | abfbdde177c3a7155070dda1b2cdc8292054cc26 (patch) | |
tree | e021306b596381fbf8311d2b7eb294e918ff17c8 /sysdeps/libm-ieee754/s_cosl.c | |
parent | 86421aa57ecfd70963ae66848bd6a6dd3b8e0fe6 (diff) | |
download | glibc-abfbdde177c3a7155070dda1b2cdc8292054cc26.tar.gz glibc-abfbdde177c3a7155070dda1b2cdc8292054cc26.tar.xz glibc-abfbdde177c3a7155070dda1b2cdc8292054cc26.zip |
Update.
Diffstat (limited to 'sysdeps/libm-ieee754/s_cosl.c')
-rw-r--r-- | sysdeps/libm-ieee754/s_cosl.c | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/sysdeps/libm-ieee754/s_cosl.c b/sysdeps/libm-ieee754/s_cosl.c deleted file mode 100644 index 9765f7fd4e..0000000000 --- a/sysdeps/libm-ieee754/s_cosl.c +++ /dev/null @@ -1,88 +0,0 @@ -/* s_cosl.c -- long double version of s_cos.c. - * Conversion to long double by Ulrich Drepper, - * Cygnus Support, drepper@cygnus.com. - */ - -/* - * ==================================================== - * 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: $"; -#endif - -/* cosl(x) - * Return cosine function of x. - * - * kernel function: - * __kernel_sinl ... sine function on [-pi/4,pi/4] - * __kernel_cosl ... cosine function on [-pi/4,pi/4] - * __ieee754_rem_pio2l ... 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__ - long double __cosl(long double x) -#else - long double __cosl(x) - long double x; -#endif -{ - long double y[2],z=0.0; - int32_t n, se, i0, i1; - - /* High word of x. */ - GET_LDOUBLE_WORDS(se,i0,i1,x); - - /* |x| ~< pi/4 */ - se &= 0x7fff; - if(se < 0x3ffe || (se == 0x3ffe && i0 <= 0xc90fdaa2)) - return __kernel_cosl(x,z); - - /* cos(Inf or NaN) is NaN */ - else if (se==0x7fff) return x-x; - - /* argument reduction needed */ - else { - n = __ieee754_rem_pio2l(x,y); - switch(n&3) { - case 0: return __kernel_cosl(y[0],y[1]); - case 1: return -__kernel_sinl(y[0],y[1],1); - case 2: return -__kernel_cosl(y[0],y[1]); - default: - return __kernel_sinl(y[0],y[1],1); - } - } -} -weak_alias (__cosl, cosl) |