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-rw-r--r--src/internal/libm.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/internal/libm.h b/src/internal/libm.h
index 62da4bdb..28537603 100644
--- a/src/internal/libm.h
+++ b/src/internal/libm.h
@@ -59,6 +59,15 @@ union ldshape {
#error Unsupported long double representation
#endif
+/* Helps static branch prediction so hot path can be better optimized. */
+#ifdef __GNUC__
+#define predict_true(x) __builtin_expect(!!(x), 1)
+#define predict_false(x) __builtin_expect(x, 0)
+#else
+#define predict_true(x) (x)
+#define predict_false(x) (x)
+#endif
+
/* Evaluate an expression as the specified type. With standard excess
precision handling a type cast or assignment is enough (with
-ffloat-store an assignment is required, in old compilers argument