81053b7fcb
- Align DLLEXPORT in definitions and declations. There is still a few cases left, where the declation in the compiler's complex.h disagrees with the implementation here. For now we can't do anything about that, but maybe should be revisited in the future. - Fix the syntax on an .ascii directive that gcc accepted mistakingly, but clang does not.
62 lines
1.9 KiB
C
62 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 "cdefs-compat.h"
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//__FBSDID("$FreeBSD: src/lib/msun/ld128/k_cosl.c,v 1.1 2008/02/17 07:32:31 das Exp $");
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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_private.h"
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/*
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* Domain [-0.7854, 0.7854], range ~[-1.80e-37, 1.79e-37]:
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* |cos(x) - c(x))| < 2**-122.0
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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 = 0.04166666666666666666666666666666658424671L,
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C2 = -0.001388888888888888888888888888863490893732L,
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C3 = 0.00002480158730158730158730158600795304914210L,
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C4 = -0.2755731922398589065255474947078934284324e-6L,
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C5 = 0.2087675698786809897659225313136400793948e-8L,
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C6 = -0.1147074559772972315817149986812031204775e-10L,
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C7 = 0.4779477332386808976875457937252120293400e-13L;
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static const double
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C8 = -0.1561920696721507929516718307820958119868e-15,
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C9 = 0.4110317413744594971475941557607804508039e-18,
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C10 = -0.8896592467191938803288521958313920156409e-21,
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C11 = 0.1601061435794535138244346256065192782581e-23;
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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))))))))));
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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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