Add dmnsn_[un]likely() macros and a profiling framework.

1 files changed, 44 insertions, 0 deletions

diff --git a/libdimension/compiler.h b/libdimension/compiler.h
new file mode 100644
index 0000000..b1cf60c
--- /dev/null
+++ b/libdimension/compiler.h
@@ -0,0 +1,44 @@
+/*************************************************************************
+ * Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/**
+ * @file
+ * Compiler abstractions.
+ */
+
+#ifndef DIMENSION_IMPL_COMPILER_H
+#define DIMENSION_IMPL_COMPILER_H
+
+#include <stdbool.h>
+
+#if DMNSN_PROFILE
+#define dmnsn_likely(test)                                      \
+  dmnsn_expect((test), true, DMNSN_FUNC, __FILE__, __LINE__)
+#define dmnsn_unlikely(test)                                    \
+  dmnsn_expect((test), false, DMNSN_FUNC, __FILE__, __LINE__)
+#elif defined(__GNUC__)
+#define dmnsn_likely(test)   __builtin_expect(!!(test), true)
+#define dmnsn_unlikely(test) __builtin_expect(!!(test), false)
+#else
+#define dmnsn_likely(test)   (test)
+#define dmnsn_unlikely(test) (test)
+#endif
+
+#endif /* DIMENSION_IMPL_COMPILER_H */