diff options
Diffstat (limited to 'nuttx/libc/math/lib_sqrtf.c')
-rw-r--r-- | nuttx/libc/math/lib_sqrtf.c | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/nuttx/libc/math/lib_sqrtf.c b/nuttx/libc/math/lib_sqrtf.c deleted file mode 100644 index cf45ccacc..000000000 --- a/nuttx/libc/math/lib_sqrtf.c +++ /dev/null @@ -1,84 +0,0 @@ -/************************************************************************ - * libc/math/lib_sqrtf.c - * - * This file is a part of NuttX: - * - * Copyright (C) 2012 Gregory Nutt. All rights reserved. - * Ported by: Darcy Gong - * - * It derives from the Rhombs OS math library by Nick Johnson which has - * a compatibile, MIT-style license: - * - * Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com> - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - * - ************************************************************************/ - -/************************************************************************ - * Included Files - ************************************************************************/ - -#include <nuttx/config.h> -#include <nuttx/compiler.h> - -#include <math.h> -#include <errno.h> - -#include "lib_internal.h" - -/************************************************************************ - * Public Functions - ************************************************************************/ - -float sqrtf(float x) -{ - float y; - - /* Filter out invalid/trivial inputs */ - - if (x < 0.0) - { - errno = EDOM; - return NAN; - } - - if (isnan(x)) - { - return NAN; - } - - if (isinf(x)) - { - return INFINITY; - } - - if (x == 0.0) - { - return 0.0; - } - - /* Guess square root (using bit manipulation) */ - - y = lib_sqrtapprox(x); - - /* Perform three iterations of approximation. This number (3) is - * definitely optimal - */ - - y = 0.5 * (y + x / y); - y = 0.5 * (y + x / y); - y = 0.5 * (y + x / y); - - return y; -} |