use branch hints in macros of slicing work-around

Cython/Compiler/ModuleNode.py

@@ -598,17 +598,17 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
   #define __Pyx_PySequence_SetSlice(obj, a, b, value) PySequence_SetSlice(obj, a, b, value)
   #define __Pyx_PySequence_DelSlice(obj, a, b) PySequence_DelSlice(obj, a, b)
 #else
-  #define __Pyx_PySequence_GetSlice(obj, a, b) ((!(obj)) ? \\
+  #define __Pyx_PySequence_GetSlice(obj, a, b) (unlikely(!(obj)) ? \\
         (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), (PyObject*)0) : \\
-        (((obj)->ob_type->tp_as_mapping) ? (PySequence_GetSlice(obj, a, b)) : \\
+        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_GetSlice(obj, a, b)) : \\
             (PyErr_Format(PyExc_TypeError, "'%.200s' object is unsliceable", (obj)->ob_type->tp_name), (PyObject*)0)))
-  #define __Pyx_PySequence_SetSlice(obj, a, b, value) ((!(obj)) ? \\
+  #define __Pyx_PySequence_SetSlice(obj, a, b, value) (unlikely(!(obj)) ? \\
         (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), -1) : \\
-        (((obj)->ob_type->tp_as_mapping) ? (PySequence_SetSlice(obj, a, b, value)) : \\
+        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_SetSlice(obj, a, b, value)) : \\
             (PyErr_Format(PyExc_TypeError, "'%.200s' object doesn't support slice assignment", (obj)->ob_type->tp_name), -1)))
-  #define __Pyx_PySequence_DelSlice(obj, a, b) ((!(obj)) ? \\
+  #define __Pyx_PySequence_DelSlice(obj, a, b) (unlikely(!(obj)) ? \\
         (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), -1) : \\
-        (((obj)->ob_type->tp_as_mapping) ? (PySequence_DelSlice(obj, a, b)) : \\
+        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_DelSlice(obj, a, b)) : \\
             (PyErr_Format(PyExc_TypeError, "'%.200s' object doesn't support slice deletion", (obj)->ob_type->tp_name), -1)))
 #endif