48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
// libpbe/include/compiler_magic.hh
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// This file is part of libpbe; see http://anyterm.org/
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// (C) 2007-2008 Philip Endecott
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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// Wrappers around various gcc thingies.
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#ifndef compiler_magic_hh
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#define compiler_magic_hh
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#ifdef __GNUC__
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// Supress unused-argument warning:
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#define PBE_UNUSED_ARG(a) a __attribute__((unused))
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// Give status branch prediction hints:
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#define IF_LIKELY(c) if(__builtin_expect(c,1))
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#define IF_UNLIKELY(c) if(__builtin_expect(c,0))
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// Warn if function result is ignored:
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#define PBE_WARN_RESULT_IGNORED __attribute__ ((warn_unused_result))
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#else
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#define PBE_UNUSED_ARG(a) a
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#define IF_LIKELY(c) if(c)
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#define IF_UNLIKELY(c) if(c)
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#define PBE_WARN_RESULT_IGNORED
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#endif
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#endif
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