diff options
Diffstat (limited to 'nuttx/libc/math/lib_libsqrtapprox.c')
-rw-r--r-- | nuttx/libc/math/lib_libsqrtapprox.c | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/nuttx/libc/math/lib_libsqrtapprox.c b/nuttx/libc/math/lib_libsqrtapprox.c deleted file mode 100644 index b6a9b0d54..000000000 --- a/nuttx/libc/math/lib_libsqrtapprox.c +++ /dev/null @@ -1,50 +0,0 @@ -/************************************************************************ - * libc/math/lib_libsqrtapprox.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 <stdint.h> -#include <math.h> - -/************************************************************************ - * Public Functions - ************************************************************************/ - -float lib_sqrtapprox(float x) -{ - int32_t i; - - /* Floats + bit manipulation = +inf fun! */ - - i = *((int32_t *) & x); - i = 0x1fc00000 + (i >> 1); - x = *((float *)&i); - - return x; -} |