count-trailing-zeros.h

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Hash : 8ad7bc67
Author :
Date : 2023-04-12T14:49:29

Add more reminders to include <config.h>.

* m4/gnulib-common.m4 (gl_COMMON): In config.h, define
_GL_CONFIG_H_INCLUDED.
* lib/acl-internal.h: Test _GL_CONFIG_H_INCLUDED instead of
_GL_INLINE_HEADER_BEGIN.
* lib/alignalloc.h: Likewise.
* lib/argp-fmtstream.h: Likewise.
* lib/argp.h: Likewise.
* lib/binary-io.h: Likewise.
* lib/bitrotate.h: Likewise.
* lib/c-ctype.h: Likewise.
* lib/count-leading-zeros.h: Likewise.
* lib/count-one-bits.h: Likewise.
* lib/count-trailing-zeros.h: Likewise.
* lib/eealloc.h: Likewise.
* lib/execinfo.in.h: Likewise.
* lib/gethrxtime.h: Likewise.
* lib/gl_list.h: Likewise.
* lib/gl_map.h: Likewise.
* lib/gl_omap.h: Likewise.
* lib/gl_openssl.h: Likewise.
* lib/gl_oset.h: Likewise.
* lib/gl_set.h: Likewise.
* lib/gl_xlist.h: Likewise.
* lib/gl_xmap.h: Likewise.
* lib/gl_xomap.h: Likewise.
* lib/gl_xoset.h: Likewise.
* lib/gl_xset.h: Likewise.
* lib/gl_xsublist.h: Likewise.
* lib/glthread/cond.h: Likewise.
* lib/hamt.h: Likewise.
* lib/ialloc.h: Likewise.
* lib/math.in.h: Likewise.
* lib/mbchar.h: Likewise.
* lib/mbfile.h: Likewise.
* lib/mbiter.h: Likewise.
* lib/mbuiter.h: Likewise.
* lib/openat.h: Likewise.
* lib/pipe-filter-aux.h: Likewise.
* lib/priv-set.h: Likewise.
* lib/safe-alloc.h: Likewise.
* lib/savewd.h: Likewise.
* lib/se-context.in.h: Likewise.
* lib/se-label.in.h: Likewise.
* lib/se-selinux.in.h: Likewise.
* lib/sig-handler.h: Likewise.
* lib/stat-time.h: Likewise.
* lib/string-desc-quotearg.h: Likewise.
* lib/string-desc.h: Likewise.
* lib/sys_socket.in.h: Likewise.
* lib/timespec.h: Likewise.
* lib/u64.h: Likewise.
* lib/uchar.in.h: Likewise.
* lib/unistd.in.h: Likewise.
* lib/utimens.h: Likewise.
* lib/wctype.in.h: Likewise.
* lib/xalloc.h: Likewise.
* lib/xbinary-io.h: Likewise.
* lib/xsize.h: Likewise.
* lib/xstring-desc.h: Likewise.
* lib/xtime.h: Likewise.
* lib/acl.h: Check that config.h was already included.
* lib/alignof.h: Likewise.
* lib/argmatch.h: Likewise.
* lib/argv-iter.h: Likewise.
* lib/arpa_inet.in.h: Likewise.
* lib/attribute.h: Likewise.
* lib/backupfile.h: Likewise.
* lib/base32.h: Likewise.
* lib/base64.h: Likewise.
* lib/basename-lgpl.h: Likewise.
* lib/bitset.h: Likewise.
* lib/bitsetv.h: Likewise.
* lib/c-snprintf.h: Likewise.
* lib/c-stack.h: Likewise.
* lib/c-strcase.h: Likewise.
* lib/c-vasnprintf.h: Likewise.
* lib/c-vasprintf.h: Likewise.
* lib/c-vsnprintf.h: Likewise.
* lib/c-xvasprintf.h: Likewise.
* lib/canon-host.h: Likewise.
* lib/canonicalize.h: Likewise.
* lib/clean-temp.h: Likewise.
* lib/concat-filename.h: Likewise.
* lib/ctype.in.h: Likewise.
* lib/dfa.h: Likewise.
* lib/di-set.h: Likewise.
* lib/dirent-safer.h: Likewise.
* lib/dirent.in.h: Likewise.
* lib/dirname.h: Likewise.
* lib/eloop-threshold.h: Likewise.
* lib/error.in.h: Likewise.
* lib/exclude.h: Likewise.
* lib/fatal-signal.h: Likewise.
* lib/fcntl.in.h: Likewise.
* lib/file-type.h: Likewise.
* lib/filenamecat.h: Likewise.
* lib/filevercmp.h: Likewise.
* lib/flexmember.h: Likewise.
* lib/fnmatch.in.h: Likewise.
* lib/fpending.h: Likewise.
* lib/freadable.h: Likewise.
* lib/freadahead.h: Likewise.
* lib/freading.h: Likewise.
* lib/fts_.h: Likewise.
* lib/fwritable.h: Likewise.
* lib/fwriting.h: Likewise.
* lib/gc.h: Likewise.
* lib/get_progname_of.h: Likewise.
* lib/glob.in.h: Likewise.
* lib/glthread/thread.h: Likewise.
* lib/hash-pjw-bare.h: Likewise.
* lib/hash-pjw.h: Likewise.
* lib/hash-triple.h: Likewise.
* lib/hash.h: Likewise.
* lib/i-ring.h: Likewise.
* lib/iconv.in.h: Likewise.
* lib/ino-map.h: Likewise.
* lib/inttostr.h: Likewise.
* lib/inttypes.in.h: Likewise.
* lib/javaversion.h: Likewise.
* lib/langinfo.in.h: Likewise.
* lib/locale.in.h: Likewise.
* lib/localename.h: Likewise.
* lib/malloc.in.h: Likewise.
* lib/malloca.h: Likewise.
* lib/memcasecmp.h: Likewise.
* lib/memchr2.h: Likewise.
* lib/memcmp2.h: Likewise.
* lib/modechange.h: Likewise.
* lib/monetary.in.h: Likewise.
* lib/mountlist.h: Likewise.
* lib/netdb.in.h: Likewise.
* lib/obstack.h: Likewise.
* lib/opendirat.h: Likewise.
* lib/pagealign_alloc.h: Likewise.
* lib/pipe-filter.h: Likewise.
* lib/poll.in.h: Likewise.
* lib/pthread.in.h: Likewise.
* lib/pty.in.h: Likewise.
* lib/quotearg.h: Likewise.
* lib/read-file.h: Likewise.
* lib/readline.h: Likewise.
* lib/readutmp.h: Likewise.
* lib/regex-quote.h: Likewise.
* lib/relocatable.h: Likewise.
* lib/savedir.h: Likewise.
* lib/sched.in.h: Likewise.
* lib/search.in.h: Likewise.
* lib/sh-quote.h: Likewise.
* lib/signal.in.h: Likewise.
* lib/sigpipe-die.h: Likewise.
* lib/sockets.h: Likewise.
* lib/spawn.in.h: Likewise.
* lib/ssfmalloc.h: Likewise.
* lib/stack.h: Likewise.
* lib/stdalign.in.h: Likewise.
* lib/stdarg.in.h: Likewise.
* lib/stddef.in.h: Likewise.
* lib/stdio-safer.h: Likewise.
* lib/stdio.in.h: Likewise.
* lib/stdlib.in.h: Likewise.
* lib/stdnoreturn.in.h: Likewise.
* lib/strerror-override.h: Likewise.
* lib/striconv.h: Likewise.
* lib/striconveh.h: Likewise.
* lib/striconveha.h: Likewise.
* lib/string-buffer.h: Likewise.
* lib/string.in.h: Likewise.
* lib/strings.in.h: Likewise.
* lib/strnlen1.h: Likewise.
* lib/sys_file.in.h: Likewise.
* lib/sys_ioctl.in.h: Likewise.
* lib/sys_random.in.h: Likewise.
* lib/sys_resource.in.h: Likewise.
* lib/sys_select.in.h: Likewise.
* lib/sys_stat.in.h: Likewise.
* lib/sys_time.in.h: Likewise.
* lib/sys_times.in.h: Likewise.
* lib/sys_utsname.in.h: Likewise.
* lib/sys_wait.in.h: Likewise.
* lib/system-quote.h: Likewise.
* lib/term-style-control.h: Likewise.
* lib/termios.in.h: Likewise.
* lib/textstyle.in.h: Likewise.
* lib/threads.in.h: Likewise.
* lib/time.in.h: Likewise.
* lib/trim.h: Likewise.
* lib/utime.in.h: Likewise.
* lib/utmp.in.h: Likewise.
* lib/vasnprintf.h: Likewise.
* lib/verror.h: Likewise.
* lib/version-etc.h: Likewise.
* lib/wchar.in.h: Likewise.
* lib/windows-spawn.h: Likewise.
* lib/windows-thread.h: Likewise.
* lib/xgetcwd.h: Likewise.
* lib/xgetdomainname.h: Likewise.
* lib/xgethostname.h: Likewise.
* lib/xmalloca.h: Likewise.
* lib/xmemdup0.h: Likewise.
* lib/xprintf.h: Likewise.
* lib/xreadlink.h: Likewise.
* lib/xstriconv.h: Likewise.
* lib/xstriconveh.h: Likewise.
* lib/xstrndup.h: Likewise.
* lib/xstrtol-error.h: Likewise.
* lib/xvasprintf.h: Likewise.
* Makefile (config_h_MACROS*): New variables.
(sc_check_config_h_reminder): New rule.

Download

lib/count-trailing-zeros.h

/* count-trailing-zeros.h -- counts the number of trailing 0 bits in a word.
   Copyright 2013-2023 Free Software Foundation, Inc.

   This file is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as
   published by the Free Software Foundation; either version 2.1 of the
   License, or (at your option) any later version.

   This file is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Paul Eggert.  */

#ifndef COUNT_TRAILING_ZEROS_H
#define COUNT_TRAILING_ZEROS_H 1

/* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE.  */
#if !_GL_CONFIG_H_INCLUDED
 #error "Please include config.h first."
#endif

#include <limits.h>
#include <stdlib.h>

_GL_INLINE_HEADER_BEGIN
#ifndef COUNT_TRAILING_ZEROS_INLINE
# define COUNT_TRAILING_ZEROS_INLINE _GL_INLINE
#endif

#ifdef __cplusplus
extern "C" {
#endif

/* Assuming the GCC builtin is BUILTIN and the MSC builtin is MSC_BUILTIN,
   expand to code that computes the number of trailing zeros of the local
   variable 'x' of type TYPE (an unsigned integer type) and return it
   from the current function.  */
#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) \
    || (__clang_major__ >= 4)
# define COUNT_TRAILING_ZEROS(BUILTIN, MSC_BUILTIN, TYPE)               \
  return x ? BUILTIN (x) : CHAR_BIT * sizeof x;
#elif _MSC_VER
# pragma intrinsic (_BitScanForward)
# if defined _M_X64
#  pragma intrinsic (_BitScanForward64)
# endif
# define COUNT_TRAILING_ZEROS(BUILTIN, MSC_BUILTIN, TYPE)               \
    do                                                                  \
      {                                                                 \
        unsigned long result;                                           \
        return MSC_BUILTIN (&result, x) ? result : CHAR_BIT * sizeof x; \
      }                                                                 \
    while (0)
#else
# define COUNT_TRAILING_ZEROS(BUILTIN, MSC_BUILTIN, TYPE)               \
    do                                                                  \
      {                                                                 \
        int count = 0;                                                  \
        if (! x)                                                        \
          return CHAR_BIT * sizeof x;                                   \
        for (count = 0;                                                 \
             (count < CHAR_BIT * sizeof x - 32                          \
              && ! (x & 0xffffffffU));                                  \
             count += 32)                                               \
          x = x >> 31 >> 1;                                             \
        return count + count_trailing_zeros_32 (x);                     \
      }                                                                 \
    while (0)

/* Compute and return the number of trailing zeros in the least
   significant 32 bits of X.  One of these bits must be nonzero.  */
COUNT_TRAILING_ZEROS_INLINE int
count_trailing_zeros_32 (unsigned int x)
{
  /* <https://github.com/gibsjose/BitHacks>
     <https://www.fit.vutbr.cz/~ibarina/pub/bithacks.pdf> */
  static const char de_Bruijn_lookup[32] = {
    0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17, 4, 8,
    31, 27, 13, 23, 21, 19, 16, 7, 26, 12, 18, 6, 11, 5, 10, 9
  };
  return de_Bruijn_lookup[(((x & -x) * 0x077cb531U) & 0xffffffffU) >> 27];
}
#endif

/* Compute and return the number of trailing zeros in X. */
COUNT_TRAILING_ZEROS_INLINE int
count_trailing_zeros (unsigned int x)
{
  COUNT_TRAILING_ZEROS (__builtin_ctz, _BitScanForward, unsigned int);
}

/* Compute and return the number of trailing zeros in X. */
COUNT_TRAILING_ZEROS_INLINE int
count_trailing_zeros_l (unsigned long int x)
{
  COUNT_TRAILING_ZEROS (__builtin_ctzl, _BitScanForward, unsigned long int);
}

/* Compute and return the number of trailing zeros in X. */
COUNT_TRAILING_ZEROS_INLINE int
count_trailing_zeros_ll (unsigned long long int x)
{
#if (defined _MSC_VER && !defined __clang__) && !defined _M_X64
  /* 32-bit MSVC does not have _BitScanForward64, only _BitScanForward.  */
  unsigned long result;
  if (_BitScanForward (&result, (unsigned long) x))
    return result;
  if (_BitScanForward (&result, (unsigned long) (x >> 32)))
    return result + 32;
  return CHAR_BIT * sizeof x;
#else
  COUNT_TRAILING_ZEROS (__builtin_ctzll, _BitScanForward64,
                        unsigned long long int);
#endif
}

#ifdef __cplusplus
}
#endif

_GL_INLINE_HEADER_END

#endif

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kc3-lang/gnulib/lib/count-trailing-zeros.h

Commit

lib/count-trailing-zeros.h