6a3c2aded6
* Simplify EINTR/ECANCEL error handling 1. Add semaphore uninterruptible wait function 2 .Replace semaphore wait loop with a single uninterruptible wait 3. Replace all sem_xxx to nxsem_xxx * Unify the void cast usage 1. Remove void cast for function because many place ignore the returned value witout cast 2. Replace void cast for variable with UNUSED macro
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/****************************************************************************
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* libs/libc/math/lib_truncl.c
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*
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* This implementation is derived from the musl library under the MIT License
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*
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* Copyright © 2005-2014 Rich Felker, et al.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <stdint.h>
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#include <float.h>
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#include <math.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#ifdef CONFIG_HAVE_LONG_DOUBLE
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static const long double toint = 1 / LDBL_EPSILON;
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/* FIXME This will only work if long double is 64 bit and little endian */
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union ldshape
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{
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long double f;
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struct
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{
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uint64_t m;
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uint16_t se;
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} i;
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};
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long double truncl(long double x)
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{
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union ldshape u =
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{
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x
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};
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int e = u.i.se & 0x7fff;
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int s = u.i.se >> 15;
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long double y;
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volatile long double __x;
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if (e >= 0x3fff + LDBL_MANT_DIG - 1)
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{
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return x;
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}
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if (e <= 0x3fff - 1)
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{
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/* Force Eval */
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__x = (x + 0x1p120f);
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UNUSED(__x);
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return x*0;
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}
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/* y = int(|x|) - |x|, where int(|x|) is an integer neighbor of |x| */
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if (s)
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{
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x = -x;
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}
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y = x + toint - toint - x;
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if (y > 0)
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{
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y -= 1;
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}
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x += y;
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return s ? -x : x;
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}
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#endif
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