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Subject: [Bug gcov-profile/55734] [4.8 Regression] gcov-io.c uses builtins not available in non-GCC compilers
Date: Wed, 19 Dec 2012 16:48:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55734

--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-12-19 16:48:00 UTC ---
Perhaps
  if (v > 0)
    {
#if IN_LIBGCOV
      r = 63 - __builtin_clzll (v);
#else
      if (sizeof (v) <= sizeof (HOST_WIDE_INT))
        r = floor_log2 (v);
      else if (sizeof (v) == 2 * sizeof (HOST_WIDE_INT))
        {
          r = v >> HOST_BITS_PER_WIDE_INT;
          if (r)
            r = floor_log2 (r) + HOST_BITS_PER_WIDE_INT;
          else
            r = floor_log2 (v);
        }
      else
        gcc_unreachable ();
#endif
    }