do not use __builtin_expect with GCC < 2.96

ec95ee9e · Stefan Behnel · 36174f39 · ec95ee9e
Commit ec95ee9e authored Sep 03, 2007 by Stefan Behnel
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Cython/Compiler/Nodes.py Cython/Compiler/Nodes.py +7 -0

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--- a/Cython/Compiler/Nodes.py
+++ b/Cython/Compiler/Nodes.py
@@ -2647,8 +2647,15 @@ if Options.gcc_branch_hints:
    branch_prediction_macros = \
    """
 #ifdef __GNUC__
+/* Test for GCC > 2.95 */
+#if __GNUC__ > 2 || \
+              (__GNUC__ == 2 && (__GNUC_MINOR__ > 95)) 
 #define likely(x)   __builtin_expect(!!(x), 1)
 #define unlikely(x) __builtin_expect(!!(x), 0)
+#else /* __GNUC__ > 2 ... */
+#define likely(x)   (x)
+#define unlikely(x) (x)
+#endif /* __GNUC__ > 2 ... */
 #else /* __GNUC__ */
 #define likely(x)   (x)
 #define unlikely(x) (x)