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Diffstat (limited to 'nuttx/libc/math/lib_libexpi.c')
-rw-r--r-- | nuttx/libc/math/lib_libexpi.c | 103 |
1 files changed, 0 insertions, 103 deletions
diff --git a/nuttx/libc/math/lib_libexpi.c b/nuttx/libc/math/lib_libexpi.c deleted file mode 100644 index 33ba537b1..000000000 --- a/nuttx/libc/math/lib_libexpi.c +++ /dev/null @@ -1,103 +0,0 @@ -/************************************************************************ - * libc/math/lib_libexpi.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 <sys/types.h> -#include <math.h> - -/************************************************************************ - * Public Functions - ************************************************************************/ - -/************************************************************************ - * Pre-processor Definitions - ************************************************************************/ - -#define M_E2 (M_E * M_E) -#define M_E4 (M_E2 * M_E2) -#define M_E8 (M_E4 * M_E4) -#define M_E16 (M_E8 * M_E8) -#define M_E32 (M_E16 * M_E16) -#define M_E64 (M_E32 * M_E32) -#define M_E128 (M_E64 * M_E64) -#define M_E256 (M_E128 * M_E128) -#define M_E512 (M_E256 * M_E256) -#define M_E1024 (M_E512 * M_E512) - -/************************************************************************ - * Private Data - ************************************************************************/ - -static double _expi_square_tbl[11] = -{ - M_E, // e^1 - M_E2, // e^2 - M_E4, // e^4 - M_E8, // e^8 - M_E16, // e^16 - M_E32, // e^32 - M_E64, // e^64 - M_E128, // e^128 - M_E256, // e^256 - M_E512, // e^512 - M_E1024, // e^1024 -}; - -/************************************************************************ - * Public Functions - ************************************************************************/ - -double lib_expi(size_t n) -{ - size_t i; - double val; - - if (n > 1024) - { - return INFINITY; - } - - val = 1.0; - - for (i = 0; n; i++) - { - if (n & (1 << i)) - { - n &= ~(1 << i); - val *= _expi_square_tbl[i]; - } - } - - return val; -} - |