kc3-lang/gnulib/m4/builtin-expect.m4

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• m4/builtin-expect.m4

• dnl Check for __builtin_expect.
  
  dnl Copyright 2016-2023 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
  
  dnl Written by Paul Eggert.
  
  AC_DEFUN([gl___BUILTIN_EXPECT],
  [
    AC_CACHE_CHECK([for __builtin_expect],
      [gl_cv___builtin_expect],
      [AC_LINK_IFELSE(
         [AC_LANG_SOURCE([[
           int
           main (int argc, char **argv)
           {
             argc = __builtin_expect (argc, 100);
             return argv[argc != 100][0];
           }]])],
         [gl_cv___builtin_expect=yes],
         [AC_LINK_IFELSE(
            [AC_LANG_SOURCE([[
               #include <builtins.h>
               int
               main (int argc, char **argv)
               {
                 argc = __builtin_expect (argc, 100);
                 return argv[argc != 100][0];
               }]])],
            [gl_cv___builtin_expect="in <builtins.h>"],
            [gl_cv___builtin_expect=no])])])
    if test "$gl_cv___builtin_expect" = yes; then
      AC_DEFINE([HAVE___BUILTIN_EXPECT], [1])
    elif test "$gl_cv___builtin_expect" = "in <builtins.h>"; then
      AC_DEFINE([HAVE___BUILTIN_EXPECT], [2])
    fi
    AH_VERBATIM([HAVE___BUILTIN_EXPECT],
      [/* Define to 1 if the compiler supports __builtin_expect,
     and to 2 if <builtins.h> does.  */
  #undef HAVE___BUILTIN_EXPECT
  #ifndef HAVE___BUILTIN_EXPECT
  # define __builtin_expect(e, c) (e)
  #elif HAVE___BUILTIN_EXPECT == 2
  # include <builtins.h>
  #endif
      ])
  ])
  

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