gh-121153: Fix some errors with use of _PyLong_CompactValue()

* The result has type Py_ssize_t, not intptr_t.
* Type cast between unsigned and signdet integer types should be explicit.
* Downcasting should be explicit.

Author: serhiy-storchaka

Objects/longobject.c

@@ -483,8 +483,8 @@ PyLong_AsLongAndOverflow(PyObject *vv, int *overflow)
         do_decref = 1;
     }
     if (_PyLong_IsCompact(v)) {
-#if SIZEOF_LONG < SIZEOF_VOID_P
-        intptr_t tmp = _PyLong_CompactValue(v);
+#if SIZEOF_LONG < SIZEOF_SIZE_T
+        Py_ssize_t tmp = _PyLong_CompactValue(v);
         res = (long)tmp;
         if (res != tmp) {
             *overflow = tmp < 0 ? -1 : 1;
@@ -632,14 +632,14 @@ PyLong_AsUnsignedLong(PyObject *vv)
 
     v = (PyLongObject *)vv;
     if (_PyLong_IsNonNegativeCompact(v)) {
-#if SIZEOF_LONG < SIZEOF_VOID_P
-        intptr_t tmp = _PyLong_CompactValue(v);
+#if SIZEOF_LONG < SIZEOF_SIZE_T
+        Py_ssize_t tmp = _PyLong_CompactValue(v);
         unsigned long res = (unsigned long)tmp;
         if (res != tmp) {
             goto overflow;
         }
 #else
-        return _PyLong_CompactValue(v);
+        return (unsigned long)(size_t)_PyLong_CompactValue(v);
 #endif
     }
     if (_PyLong_IsNegative(v)) {
@@ -685,7 +685,7 @@ PyLong_AsSize_t(PyObject *vv)
 
     v = (PyLongObject *)vv;
     if (_PyLong_IsNonNegativeCompact(v)) {
-        return _PyLong_CompactValue(v);
+        return (size_t)_PyLong_CompactValue(v);
     }
     if (_PyLong_IsNegative(v)) {
         PyErr_SetString(PyExc_OverflowError,
@@ -722,7 +722,7 @@ _PyLong_AsUnsignedLongMask(PyObject *vv)
     }
     v = (PyLongObject *)vv;
     if (_PyLong_IsCompact(v)) {
-        return (unsigned long)_PyLong_CompactValue(v);
+        return (unsigned long)(size_t)_PyLong_CompactValue(v);
     }
     i = _PyLong_DigitCount(v);
     int sign = _PyLong_NonCompactSign(v);
@@ -1540,7 +1540,7 @@ PyLong_AsUnsignedLongLong(PyObject *vv)
     v = (PyLongObject*)vv;
     if (_PyLong_IsNonNegativeCompact(v)) {
         res = 0;
-        bytes = _PyLong_CompactValue(v);
+        bytes = (unsigned long long)(size_t)_PyLong_CompactValue(v);
     }
     else {
         res = _PyLong_AsByteArray((PyLongObject *)vv, (unsigned char *)&bytes,
@@ -1571,7 +1571,7 @@ _PyLong_AsUnsignedLongLongMask(PyObject *vv)
     }
     v = (PyLongObject *)vv;
     if (_PyLong_IsCompact(v)) {
-        return (unsigned long long)(signed long long)_PyLong_CompactValue(v);
+        return (unsigned long long)(size_t)_PyLong_CompactValue(v);
     }
     i = _PyLong_DigitCount(v);
     sign = _PyLong_NonCompactSign(v);
@@ -3579,7 +3579,7 @@ long_hash(PyLongObject *v)
     int sign;
 
     if (_PyLong_IsCompact(v)) {
-        x = _PyLong_CompactValue(v);
+        x = (Py_uhash_t)(size_t)_PyLong_CompactValue(v);
         if (x == (Py_uhash_t)-1) {
             x = (Py_uhash_t)-2;
         }