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Diffstat (limited to 'lib/mlibc/options/ansi/generic/complex/csqrt.c')
| -rw-r--r-- | lib/mlibc/options/ansi/generic/complex/csqrt.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/lib/mlibc/options/ansi/generic/complex/csqrt.c b/lib/mlibc/options/ansi/generic/complex/csqrt.c deleted file mode 100644 index b144b7c..0000000 --- a/lib/mlibc/options/ansi/generic/complex/csqrt.c +++ /dev/null @@ -1,137 +0,0 @@ -/* $NetBSD: csqrt.c,v 1.1 2007/08/20 16:01:37 drochner Exp $ */ - -/*- - * Copyright (c) 2007 The NetBSD Foundation, Inc. - * All rights reserved. - * - * This code is derived from software written by Stephen L. Moshier. - * It is redistributed by the NetBSD Foundation by permission of the author. - * - * 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. - * - * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. - * - * imported and modified include for newlib 2010/10/03 - * Marco Atzeri <marco_atzeri@yahoo.it> - */ - -/* -FUNCTION - <<csqrt>>, <<csqrtf>>---complex square root - -INDEX - csqrt -INDEX - csqrtf - -ANSI_SYNOPSIS - #include <complex.h> - double complex csqrt(double complex <[z]>); - float complex csqrtf(float complex <[z]>); - - -DESCRIPTION - These functions compute the complex square root of <[z]>, with - a branch cut along the negative real axis. - - <<csqrtf>> is identical to <<csqrt>>, except that it performs - its calculations on <<floats complex>>. - -RETURNS - The csqrt functions return the complex square root value, in - the range of the right halfplane (including the imaginary axis). - -PORTABILITY - <<csqrt>> and <<csqrtf>> are ISO C99 - -QUICKREF - <<csqrt>> and <<csqrtf>> are ISO C99 - -*/ - - -#include <complex.h> -#include <math.h> - -double complex -csqrt(double complex z) -{ - double complex w; - double x, y, r, t, scale; - - x = creal (z); - y = cimag (z); - - if (y == 0.0) { - if (x == 0.0) { - w = 0.0 + y * I; - } else { - r = fabs(x); - r = sqrt(r); - if (x < 0.0) { - w = 0.0 + r * I; - } else { - w = r + y * I; - } - } - return w; - } - if (x == 0.0) { - r = fabs(y); - r = sqrt(0.5 * r); - if (y > 0) - w = r + r * I; - else - w = r - r * I; - return w; - } - /* Rescale to avoid internal overflow or underflow. */ - if ((fabs(x) > 4.0) || (fabs(y) > 4.0)) { - x *= 0.25; - y *= 0.25; - scale = 2.0; - } else { -#if 1 - x *= 1.8014398509481984e16; /* 2^54 */ - y *= 1.8014398509481984e16; - scale = 7.450580596923828125e-9; /* 2^-27 */ -#else - x *= 4.0; - y *= 4.0; - scale = 0.5; -#endif - } - w = x + y * I; - r = cabs(w); - if (x > 0) { - t = sqrt(0.5 * r + 0.5 * x); - r = scale * fabs((0.5 * y) / t ); - t *= scale; - } else { - r = sqrt(0.5 * r - 0.5 * x); - t = scale * fabs((0.5 * y) / r); - r *= scale; - } - if (y < 0) - w = t - r * I; - else - w = t + r * I; - return w; -} |