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Disable _PyStack_AsTuple() inlining
Issue #29234: Inlining _PyStack_AsTuple() into callers increases their stack consumption, Disable inlining to optimize the stack consumption. Add _Py_NO_INLINE: use __attribute__((noinline)) of GCC and Clang. It reduces the stack consumption, bytes per call, before => after: test_python_call: 1040 => 976 (-64 B) test_python_getitem: 976 => 912 (-64 B) test_python_iterator: 1120 => 1056 (-64 B) => total: 3136 => 2944 (- 192 B)
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@ -507,7 +507,7 @@ extern "C" {
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* locality.
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*
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* Usage:
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* int _Py_HOT_FUNCTION x() { return 3; }
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* int _Py_HOT_FUNCTION x(void) { return 3; }
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*
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* Issue #28618: This attribute must not be abused, otherwise it can have a
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* negative effect on performance. Only the functions were Python spend most of
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@ -521,6 +521,19 @@ extern "C" {
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#define _Py_HOT_FUNCTION
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#endif
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/* _Py_NO_INLINE
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* Disable inlining on a function. For example, it helps to reduce the C stack
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* consumption.
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*
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* Usage:
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* int _Py_NO_INLINE x(void) { return 3; }
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*/
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#if defined(__GNUC__) || defined(__clang__)
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# define _Py_NO_INLINE __attribute__((noinline))
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#else
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# define _Py_NO_INLINE
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#endif
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/**************************************************************************
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Prototypes that are missing from the standard include files on some systems
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(and possibly only some versions of such systems.)
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@ -2256,7 +2256,9 @@ PyObject_Call(PyObject *callable, PyObject *args, PyObject *kwargs)
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return _Py_CheckFunctionResult(callable, result, NULL);
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}
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PyObject*
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/* Issue #29234: Inlining _PyStack_AsTuple() into callers increases their
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stack consumption, Disable inlining to optimize the stack consumption. */
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PyObject* _Py_NO_INLINE
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_PyStack_AsTuple(PyObject **stack, Py_ssize_t nargs)
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{
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PyObject *args;
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