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math: Implement cbrt

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Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
This commit is contained in:
Huang Qi 2020-08-12 18:03:00 +08:00 committed by Xiang Xiao
parent 7356b5a2ed
commit 57e1211ed6
3 changed files with 60 additions and 1 deletions
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4
include/nuttx/lib/math.h
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@ -372,6 +372,10 @@ double cosh (double x);
long double coshl (long double x);
#endif
#ifdef CONFIG_HAVE_DOUBLE
double cbrt (double x);
#endif
float tanhf (float x);
#ifdef CONFIG_HAVE_DOUBLE
double tanh (double x);

2
libs/libc/math/Make.defs
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@ -49,7 +49,7 @@ CSRCS += lib_cosh.c lib_exp.c lib_fabs.c lib_fmod.c lib_frexp.c
CSRCS += lib_ldexp.c lib_log.c lib_log10.c lib_log2.c lib_modf.c
CSRCS += lib_pow.c lib_sin.c lib_sinh.c lib_sqrt.c lib_tan.c
CSRCS += lib_tanh.c lib_asinh.c lib_acosh.c lib_atanh.c lib_erf.c
CSRCS += lib_copysign.c
CSRCS += lib_copysign.c lib_cbrt.c
CSRCS += lib_acosl.c lib_asinl.c lib_atan2l.c lib_atanl.c lib_ceill.c
CSRCS += lib_cosl.c lib_coshl.c lib_expl.c lib_fabsl.c lib_floorl.c

55
libs/libc/math/lib_cbrt.c Normal file
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@ -0,0 +1,55 @@
/****************************************************************************
* libs/libc/math/lib_cbrt.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <sys/types.h>
#include <math.h>
#include <float.h>
#ifdef CONFIG_HAVE_DOUBLE
/****************************************************************************
* Public Functions
****************************************************************************/
double cbrt(double x)
{
if (fabs(x) < DBL_EPSILON)
{
return 0.0;
}
if (x > 0.0)
{
return pow(x, 1.0 / 3.0);
}
else
{
return -pow(-x, 1.0 / 3.0);
}
}
#endif