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/* |
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* This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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* |
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* Copyright (©) 2009 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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* |
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* Deliantra is free software: you can redistribute it and/or modify it under |
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* the terms of the Affero GNU General Public License as published by the |
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* Free Software Foundation, either version 3 of the License, or (at your |
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* option) 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 Affero GNU General Public License |
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* and the GNU General Public License along with this program. If not, see |
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* <http://www.gnu.org/licenses/>. |
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* |
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* The authors can be reached via e-mail to <support@deliantra.net> |
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*/ |
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#ifndef COMPILER_H |
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#define COMPILER_H |
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#define GCC_VERSION(major,minor) (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))) |
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#if GCC_VERSION(3,0) |
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# define attribute(attrlist) __attribute__(attrlist) |
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#else |
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# define attribute(attrlist) |
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#endif |
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#if GCC_VERSION(3,0) |
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# define is_constant(c) __builtin_constant_p (c) |
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# define expect(expr,value) __builtin_expect ((expr),(value)) |
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# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality) |
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# define noinline __attribute__((__noinline__)) |
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#else |
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# define is_constant(c) 0 |
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# define expect(expr,value) (expr) |
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# define prefetch(addr,rw,locality) |
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# define noinline |
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#endif |
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#if !GCC_VERSION(4,4) |
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# define decltype(x) typeof(x) |
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#endif |
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#if GCC_VERSION(4,5) |
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# define unreachable() __builtin_unreachable () |
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#else |
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// this seems to work fine, but gcc always emits a warning for it :/ |
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static inline void unreachable () attribute ((noreturn)); |
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static inline void unreachable () { } |
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#endif |
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// put into ifs if you are very sure that the expression |
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// is mostly true or mosty false. note that these return |
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// booleans, not the expression. |
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#define expect_false(expr) expect ((expr) ? 1 : 0, 0) |
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#define expect_true(expr) expect ((expr) ? 1 : 0, 1) |
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// try to tell the compiler tat some condition is definitely true |
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#define assume(cond) do { if (!(cond)) unreachable (); } while (0) |
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#endif |
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