perf(longobject): keep wide int helper local

Author: KRRT7

Include/internal/pycore_long.h

@@ -388,12 +388,6 @@ _PyLong_FitsInt64(const PyLongObject *v)
     return top <= max_top;
 }
 
-static inline int
-_PyLong_CheckExactAndFitsInt64(PyObject *op)
-{
-    return PyLong_CheckExact(op) && _PyLong_FitsInt64((const PyLongObject *)op);
-}
-
 /* Extract an exact int to int64_t without raising.
  * Returns true and writes *out on success; returns false if out of range.
  * Never sets a Python exception. */

Objects/longobject.c

@@ -3942,6 +3942,15 @@ _wide_op_result(int64_t v)
     return PyStackRef_FromPyObjectStealMortal(result);
 }
 
+/* Exact int -> int64_t helper for the wide int fast path.
+ * Keeps the exact-type check local to this translation unit. */
+static inline bool
+_PyLong_CheckExactAndTryAsInt64(PyObject *op, int64_t *out)
+{
+    return PyLong_CheckExact(op) &&
+        _PyLong_TryAsInt64Exact((PyLongObject *)op, out);
+}
+
 /* Wide variant: operands are exact ints in the full int64 range (may be
  * non-compact).  Returns PyStackRef_NULL (without raising) when an input is
  * out of int64 range or the sum overflows int64.  Returns PyStackRef_ERROR
@@ -3955,7 +3964,8 @@ _PyCompactLong_AddWide(PyLongObject *a, PyLongObject *b)
         return medium_from_stwodigits(v);
     }
     int64_t va, vb;
-    if (!_PyLong_TryAsInt64Exact(a, &va) || !_PyLong_TryAsInt64Exact(b, &vb)) {
+    if (!_PyLong_CheckExactAndTryAsInt64((PyObject *)a, &va) ||
+        !_PyLong_CheckExactAndTryAsInt64((PyObject *)b, &vb)) {
         return PyStackRef_NULL;
     }
     int64_t v;
@@ -3972,7 +3982,6 @@ long_add_method(PyObject *a, PyObject *b)
     return (PyObject*)long_add((PyLongObject*)a, (PyLongObject*)b);
 }
 
-
 static PyLongObject *
 long_sub(PyLongObject *a, PyLongObject *b)
 {
@@ -4032,7 +4041,8 @@ _PyCompactLong_SubtractWide(PyLongObject *a, PyLongObject *b)
         return medium_from_stwodigits(v);
     }
     int64_t va, vb;
-    if (!_PyLong_TryAsInt64Exact(a, &va) || !_PyLong_TryAsInt64Exact(b, &vb)) {
+    if (!_PyLong_CheckExactAndTryAsInt64((PyObject *)a, &va) ||
+        !_PyLong_CheckExactAndTryAsInt64((PyObject *)b, &vb)) {
         return PyStackRef_NULL;
     }
     int64_t v;