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libc: Implement popcount/popcountl/popcountll

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specified here:
https://www.unix.com/man-page/netbsd/3/popcountll/

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao 2020-09-21 16:34:16 +08:00 committed by Brennan Ashton
parent 657d1c9fdc
commit ba3f12c93f
6 changed files with 173 additions and 2 deletions
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5
include/nuttx/compiler.h
View file

@ -60,8 +60,9 @@
*/
#if __GNUC__ >= 4
# define CONFIG_HAVE_BUILTIN_CTZ 1
# define CONFIG_HAVE_BUILTIN_CLZ 1
# define CONFIG_HAVE_BUILTIN_CTZ 1
# define CONFIG_HAVE_BUILTIN_CLZ 1
# define CONFIG_HAVE_BUILTIN_POPCOUNT 1
#endif
/* C++ support */

4
include/strings.h
View file

@ -89,6 +89,10 @@ int flsl(long j);
int flsll(long long j);
#endif
unsigned int popcount(unsigned int j);
unsigned int popcountl(unsigned long j);
unsigned int popcountll(unsigned long long j);
FAR char *index(FAR const char *s, int c);
FAR char *rindex(FAR const char *s, int c);

1
libs/libc/string/Make.defs
View file

@ -39,6 +39,7 @@
CSRCS += lib_ffs.c lib_ffsl.c lib_ffsll.c lib_fls.c lib_flsl.c
CSRCS += lib_flsll.c lib_isbasedigit.c lib_memset.c lib_memchr.c
CSRCS += lib_memccpy.c lib_memcmp.c lib_memmove.c lib_memrchr.c
CSRCS += lib_popcount.c lib_popcountl.c lib_popcountll.c
CSRCS += lib_skipspace.c lib_stpcpy.c lib_stpncpy.c lib_strcasecmp.c
CSRCS += lib_strcat.c lib_strchr.c lib_strcpy.c lib_strcmp.c lib_strcspn.c
CSRCS += lib_strdup.c lib_strerror.c lib_strlen.c lib_strnlen.c

55
libs/libc/string/lib_popcount.c Normal file
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@ -0,0 +1,55 @@
/****************************************************************************
* libs/libc/string/lib_popcount.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/compiler.h>
#include <strings.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: popcount
****************************************************************************/
unsigned int popcount(unsigned int j)
{
#ifdef CONFIG_HAVE_BUILTIN_POPCOUNT
return __builtin_popcount(j);
#else
unsigned int count = 0;
while (j > 0)
{
if ((j & 1) == 1)
{
count++;
}
j >>= 1;
}
return count;
#endif
}

55
libs/libc/string/lib_popcountl.c Normal file
View file

@ -0,0 +1,55 @@
/****************************************************************************
* libs/libc/string/lib_popcountl.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/compiler.h>
#include <strings.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: popcount
****************************************************************************/
unsigned int popcountl(unsigned long j)
{
#ifdef CONFIG_HAVE_BUILTIN_POPCOUNT
return __builtin_popcountl(j);
#else
unsigned int count = 0;
while (j > 0)
{
if ((j & 1) == 1)
{
count++;
}
j >>= 1;
}
return count;
#endif
}

55
libs/libc/string/lib_popcountll.c Normal file
View file

@ -0,0 +1,55 @@
/****************************************************************************
* libs/libc/string/lib_popcountll.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/compiler.h>
#include <strings.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: popcount
****************************************************************************/
unsigned int popcountll(unsigned long long j)
{
#ifdef CONFIG_HAVE_BUILTIN_POPCOUNT
return __builtin_popcountll(j);
#else
unsigned int count = 0;
while (j > 0)
{
if ((j & 1) == 1)
{
count++;
}
j >>= 1;
}
return count;
#endif
}