debugpred.h

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/* 
   Copyright (C) 2008, 2009 Red Hat, Inc.
   Copyright (c) 2011, 2012 The University of Utah

   This file primarily contains the `likely/unlikely' definitions from
   Red Hat elfutils file `lib/eu-config.h'.

   Red Hat elfutils is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by the
   Free Software Foundation; version 2 of the License.

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   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with Red Hat elfutils; if not, write to the Free Software Foundation,
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   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
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#ifndef __DEBUGPRED_H__
#define __DEBUGPRED_H__

#define DEBUGPRED 1
#ifndef PIC
#define PIC 1
#endif

#if DEBUGPRED
# ifdef __x86_64__
asm (".section predict_data, \"aw\"; .previous\n"
     ".section predict_line, \"a\"; .previous\n"
     ".section predict_file, \"a\"; .previous");
#  ifndef PIC
#   define debugpred__(e, E) \
  ({ long int _e = !!(e); \
     asm volatile (".pushsection predict_data; ..predictcnt%=: .quad 0; .quad 0\n" \
                   ".section predict_line; .quad %c1\n" \
                   ".section predict_file; .quad %c2; .popsection\n" \
                   "addq $1,..predictcnt%=(,%0,8)" \
                   : : "r" (_e == E), "i" (__LINE__), "i" (__FILE__)); \
    __builtin_expect (_e, E); \
  })
#  endif
# elif defined __i386__
asm (".section predict_data, \"aw\"; .previous\n"
     ".section predict_line, \"a\"; .previous\n"
     ".section predict_file, \"a\"; .previous");
#  ifndef PIC
#   define debugpred__(e, E) \
  ({ long int _e = !!(e); \
     asm volatile (".pushsection predict_data; ..predictcnt%=: .long 0; .long 0\n" \
                   ".section predict_line; .long %c1\n" \
                   ".section predict_file; .long %c2; .popsection\n" \
                   "incl ..predictcnt%=(,%0,8)" \
                   : : "r" (_e == E), "i" (__LINE__), "i" (__FILE__)); \
    __builtin_expect (_e, E); \
  })
#  endif
# endif
# ifdef debugpred__
#  define unlikely(e) debugpred__ (e,0)
#  define likely(e) debugpred__ (e,1)
# endif
#endif
#ifndef likely
# define unlikely(expr) __builtin_expect (!!(expr), 0)
# define likely(expr) __builtin_expect (!!(expr), 1)
#endif

#endif /* __DEBUGPRED_H__ */