pmt: revert 7f8090b

include/libgnulib/ffsl.h

@@ -1,92 +0,0 @@
-/* ffsl.h -- find the first set bit in a word.
-   Copyright (C) 2011-2024 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 Eric Blake.  */
-
-/* This file is meant to be included by ffsl.c and ffsll.c, after
-   they have defined FUNC and TYPE.  */
-
-#include <config.h>
-
-/* Specification.  */
-#include <string.h>
-
-#include <limits.h>
-#include <strings.h>
-
-#if defined _MSC_VER && !(__clang_major__ >= 4)
-# include <intrin.h>
-/* Copied from ffs.c.  */
-static inline int
-ffs (int i)
-{
-  /* _BitScanForward
-     <https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64> */
-  unsigned long bit;
-  if (_BitScanForward (&bit, i))
-    return bit + 1;
-  else
-    return 0;
-}
-#endif
-
-#if !defined FUNC || !defined TYPE
-# error
-#endif
-
-int
-FUNC (TYPE i)
-{
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) \
-    || (__clang_major__ >= 4)
-  return GCC_BUILTIN (i);
-#elif defined _MSC_VER && defined MSVC_BUILTIN
-  /* _BitScanForward, _BitScanForward64
-     <https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64> */
-  unsigned long bit;
-  if (MSVC_BUILTIN (&bit, i))
-    return bit + 1;
-  else
-    return 0;
-#else
-  unsigned TYPE j = i;
-  /* Split j into chunks, and look at one chunk after the other.  */
-  enum { chunk_bits = CHAR_BIT * sizeof (unsigned int) };
-  /* The number of chunks is ceil (sizeof (TYPE) / sizeof (unsigned int))
-     = (sizeof (TYPE) - 1) / sizeof (unsigned int) + 1. */
-  enum { chunk_count = (sizeof (TYPE) - 1) / sizeof (unsigned int) + 1 };
-
-  if (chunk_count > 1)
-    {
-      size_t k;
-
-      /* It is tempting to write  if (!j)  here, but if we do this,
-         Solaris 10/x86 "cc -O" miscompiles the code.  */
-      if (!i)
-        return 0;
-      /* Unroll the first loop round.  k = 0.  */
-      if ((unsigned int) j)
-        return ffs ((unsigned int) j);
-      /* Generic loop.  */
-      for (k = 1; k < chunk_count - 1; k++)
-        if ((unsigned int) (j >> (k * chunk_bits)) != 0)
-          return k * chunk_bits + ffs ((unsigned int) (j >> (k * chunk_bits)));
-    }
-  /* Last loop round.  k = chunk_count - 1.  */
-  return (chunk_count - 1) * chunk_bits
-         + ffs ((unsigned int) (j >> ((chunk_count - 1) * chunk_bits)));
-#endif
-}