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patacongo
5b7a650b16
git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5269 42af7a65-404d-4744-a932-0658087f49c3
35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
/*
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* Copyright (C) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <apps/math.h>
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#include <float.h>
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float frexpf(float x, int *exp) {
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*exp = (int) ceilf(log2f(x));
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return x / ldexpf(1.0, *exp);
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}
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double frexp(double x, int *exp) {
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*exp = (int) ceil(log2(x));
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return x / ldexp(1.0, *exp);
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}
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long double frexpl(long double x, int *exp) {
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*exp = (int) ceill(log2(x));
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return x / ldexpl(1.0, *exp);
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}
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