Inline call_function()

vstinner · vstinner · commit 415c5107be98 · 2017-01-11T00:54:57.000+01:00
Issue python#29227: Inline call_function() into _PyEval_EvalFrameDefault() using Py_LOCAL_INLINE to reduce the stack consumption. It reduces the stack consumption, bytes per call, before => after: test_python_call: 1152 => 1040 (-112 B) test_python_getitem: 1008 => 976 (-32 B) test_python_iterator: 1232 => 1120 (-112 B) => total: 3392 => 3136 (- 256 B)
diff --git a/Python/ceval.c b/Python/ceval.c
@@ -36,7 +36,7 @@ extern int _PyObject_GetMethod(PyObject *, PyObject *, PyObject **);
 typedef PyObject *(*callproc)(PyObject *, PyObject *, PyObject *);
 
 /* Forward declarations */
-static PyObject * call_function(PyObject ***, Py_ssize_t, PyObject *);
+Py_LOCAL_INLINE(PyObject *) call_function(PyObject ***, Py_ssize_t, PyObject *);
 static PyObject * fast_function(PyObject *, PyObject **, Py_ssize_t, PyObject *);
 static PyObject * do_call_core(PyObject *, PyObject *, PyObject *);
 
@@ -4829,7 +4829,9 @@ if (tstate->use_tracing && tstate->c_profilefunc) { \
     x = call; \
     }
 
-static PyObject* _Py_HOT_FUNCTION
+/* Issue #29227: Inline call_function() into _PyEval_EvalFrameDefault()
+   to reduce the stack consumption. */
+Py_LOCAL_INLINE(PyObject *) _Py_HOT_FUNCTION
 call_function(PyObject ***pp_stack, Py_ssize_t oparg, PyObject *kwnames)
 {
     PyObject **pfunc = (*pp_stack) - oparg - 1;
