mirror of
git://sourceware.org/git/newlib-cygwin.git
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048ebea981
Rename s_nearbyint.c, s_fdim.c and s_scalbln.c to remove conflicts
Remove functions that are not needed from above files
Modify include paths
Add includes missing in cygwin build
Add missing types
Create Makefiles
Create header files to resolve dependencies between directories
Modify some instances of unsigned long to uint64_t for 32 bit platforms
Add HAVE_FPMATH_H
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* From: @(#)k_cos.c 1.3 95/01/18 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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* Copyright (c) 2008 Steven G. Kargl, David Schultz, Bruce D. Evans.
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*
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* Developed at SunSoft, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* ld128 version of k_cos.c. See ../src/k_cos.c for most comments.
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*/
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#include <math.h>
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#include "../ld/math_private.h"
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/*
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* Domain [-0.7854, 0.7854], range ~[-1.17e-39, 1.19e-39]:
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* |cos(x) - c(x))| < 2**-129.3
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*
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* 113-bit precision requires more care than 64-bit precision, since
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* simple methods give a minimax polynomial with coefficient for x^2
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* that is 1 ulp below 0.5, but we want it to be precisely 0.5. See
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* ../ld80/k_cosl.c for more details.
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*/
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static const double
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one = 1.0;
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static const long double
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C1 = 4.16666666666666666666666666666666667e-02L,
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C2 = -1.38888888888888888888888888888888834e-03L,
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C3 = 2.48015873015873015873015873015446795e-05L,
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C4 = -2.75573192239858906525573190949988493e-07L,
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C5 = 2.08767569878680989792098886701451072e-09L,
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C6 = -1.14707455977297247136657111139971865e-11L,
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C7 = 4.77947733238738518870113294139830239e-14L,
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C8 = -1.56192069685858079920640872925306403e-16L,
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C9 = 4.11031762320473354032038893429515732e-19L,
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C10= -8.89679121027589608738005163931958096e-22L,
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C11= 1.61171797801314301767074036661901531e-24L,
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C12= -2.46748624357670948912574279501044295e-27L;
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long double
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__kernel_cosl(long double x, long double y)
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{
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long double hz,z,r,w;
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z = x*x;
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r = z*(C1+z*(C2+z*(C3+z*(C4+z*(C5+z*(C6+z*(C7+
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z*(C8+z*(C9+z*(C10+z*(C11+z*C12)))))))))));
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hz = 0.5*z;
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w = one-hz;
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return w + (((one-w)-hz) + (z*r-x*y));
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}
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