GH-125323: Convert DECREF_INPUTS_AND_REUSE_FLOAT into a function that takes PyStackRefs.

Include/internal/pycore_ceval.h

@@ -316,6 +316,8 @@ _Py_eval_breaker_bit_is_set(PyThreadState *tstate, uintptr_t bit)
 void _Py_set_eval_breaker_bit_all(PyInterpreterState *interp, uintptr_t bit);
 void _Py_unset_eval_breaker_bit_all(PyInterpreterState *interp, uintptr_t bit);
 
+PyAPI_FUNC(PyObject *) _PyFloat_FromDouble_ConsumeInputs(_PyStackRef left, _PyStackRef right, double value);
+
 
 #ifdef __cplusplus
 }

Include/internal/pycore_stackref.h

@@ -76,6 +76,13 @@ PyStackRef_AsPyObjectBorrow(_PyStackRef stackref)
 
 #define PyStackRef_IsDeferred(ref) (((ref).bits & Py_TAG_BITS) == Py_TAG_DEFERRED)
 
+static inline PyObject *
+PyStackRef_NotDeferred_AsPyObject(_PyStackRef stackref)
+{
+    assert(!PyStackRef_IsDeferred(stackref));
+    return (PyObject *)stackref.bits;
+}
+
 static inline PyObject *
 PyStackRef_AsPyObjectSteal(_PyStackRef stackref)
 {

Objects/floatobject.c

@@ -134,6 +134,58 @@ PyFloat_FromDouble(double fval)
     return (PyObject *) op;
 }
 
+#ifdef Py_GIL_DISABLED
+
+PyObject *_PyFloat_FromDouble_ConsumeInputs(_PyStackRef left, _PyStackRef right, double value)
+{
+    PyObject *left_o = PyStackRef_NotDeferred_AsPyObject(left);
+    PyObject *right_o = PyStackRef_NotDeferred_AsPyObject(right);
+    assert(PyLong_Check(left_o));
+    assert(PyLong_Check(right_o));
+    if (Py_REFCNT(left_o) == 1) {
+        ((PyFloatObject *)left_o)->ob_fval = value;
+        _Py_DECREF_SPECIALIZED(right_o, _PyFloat_ExactDealloc);
+        return left_o;
+    }
+    else if (Py_REFCNT(right_o) == 1)  {
+        ((PyFloatObject *)right_o)->ob_fval = value;
+        _Py_DECREF_NO_DEALLOC(left_o);
+        return right_o;
+    }
+    else {
+        PyObject *result = PyFloat_FromDouble(value);
+        _Py_DECREF_NO_DEALLOC(left_o);
+        _Py_DECREF_NO_DEALLOC(right_o);
+        return result;
+    }
+}
+
+#else // Py_GIL_DISABLED
+
+PyObject *_PyFloat_FromDouble_ConsumeInputs(_PyStackRef left, _PyStackRef right, double value)
+{
+    PyObject *left_o = PyStackRef_AsPyObjectSteal(left);
+    PyObject *right_o = PyStackRef_AsPyObjectSteal(right);
+    if (Py_REFCNT(left_o) == 1) {
+        ((PyFloatObject *)left_o)->ob_fval = value;
+        _Py_DECREF_SPECIALIZED(right_o, _PyFloat_ExactDealloc);
+        return left_o;
+    }
+    else if (Py_REFCNT(right_o) == 1)  {
+        ((PyFloatObject *)right_o)->ob_fval = value;
+        _Py_DECREF_NO_DEALLOC(left_o);
+        return right_o;
+    }
+    else {
+        PyObject *result = PyFloat_FromDouble(value);
+        _Py_DECREF_NO_DEALLOC(left_o);
+        _Py_DECREF_NO_DEALLOC(right_o);
+        return result;
+    }
+}
+
+#endif // Py_GIL_DISABLED
+
 static PyObject *
 float_from_string_inner(const char *s, Py_ssize_t len, void *obj)
 {

Python/bytecodes.c

@@ -539,9 +539,9 @@ dummy_func(
             double dres =
                 ((PyFloatObject *)left_o)->ob_fval *
                 ((PyFloatObject *)right_o)->ob_fval;
-            PyObject *res_o;
-            DECREF_INPUTS_AND_REUSE_FLOAT(left_o, right_o, dres, res_o);
+            PyObject *res_o = _PyFloat_FromDouble_ConsumeInputs(left, right, dres);
             INPUTS_DEAD();
+            ERROR_IF(res_o == NULL, error);
             res = PyStackRef_FromPyObjectSteal(res_o);
         }
 
@@ -553,9 +553,9 @@ dummy_func(
             double dres =
                 ((PyFloatObject *)left_o)->ob_fval +
                 ((PyFloatObject *)right_o)->ob_fval;
-            PyObject *res_o;
-            DECREF_INPUTS_AND_REUSE_FLOAT(left_o, right_o, dres, res_o);
+            PyObject *res_o = _PyFloat_FromDouble_ConsumeInputs(left, right, dres);
             INPUTS_DEAD();
+            ERROR_IF(res_o == NULL, error);
             res = PyStackRef_FromPyObjectSteal(res_o);
         }
 
@@ -567,9 +567,9 @@ dummy_func(
             double dres =
                 ((PyFloatObject *)left_o)->ob_fval -
                 ((PyFloatObject *)right_o)->ob_fval;
-            PyObject *res_o;
-            DECREF_INPUTS_AND_REUSE_FLOAT(left_o, right_o, dres, res_o);
+            PyObject *res_o = _PyFloat_FromDouble_ConsumeInputs(left, right, dres);
             INPUTS_DEAD();
+            ERROR_IF(res_o == NULL, error);
             res = PyStackRef_FromPyObjectSteal(res_o);
         }
 

Python/ceval_macros.h

@@ -327,26 +327,6 @@ GETITEM(PyObject *v, Py_ssize_t i) {
     " in enclosing scope"
 #define NAME_ERROR_MSG "name '%.200s' is not defined"
 
-#define DECREF_INPUTS_AND_REUSE_FLOAT(left, right, dval, result) \
-do { \
-    if (Py_REFCNT(left) == 1) { \
-        ((PyFloatObject *)left)->ob_fval = (dval); \
-        _Py_DECREF_SPECIALIZED(right, _PyFloat_ExactDealloc);\
-        result = (left); \
-    } \
-    else if (Py_REFCNT(right) == 1)  {\
-        ((PyFloatObject *)right)->ob_fval = (dval); \
-        _Py_DECREF_NO_DEALLOC(left); \
-        result = (right); \
-    }\
-    else { \
-        result = PyFloat_FromDouble(dval); \
-        if ((result) == NULL) GOTO_ERROR(error); \
-        _Py_DECREF_NO_DEALLOC(left); \
-        _Py_DECREF_NO_DEALLOC(right); \
-    } \
-} while (0)
-
 // If a trace function sets a new f_lineno and
 // *then* raises, we use the destination when searching
 // for an exception handler, displaying the traceback, and so on

Tools/cases_generator/analyzer.py

@@ -575,6 +575,7 @@ def has_error_without_pop(op: parser.InstDef) -> bool:
     "_PyDictValues_AddToInsertionOrder",
     "_PyErr_Occurred",
     "_PyEval_FrameClearAndPop",
+    "_PyFloat_FromDouble_ConsumeInputs",
     "_PyFrame_GetCode",
     "_PyFrame_IsIncomplete",
     "_PyFrame_PushUnchecked",