Convert PyLong_FromLongLong() as well to leverage macro PYLONG_FROM_SIGNED. And also added a blurb about the changes

Author: srinivasreddy

Misc/NEWS.d/next/Core_and_Builtins/2025-01-22-14-24-44.gh-issue-129149.wAYu43.rst

@@ -0,0 +1,2 @@
+Add Missing fast path in PyLong_FromLong(), PyLong_FromLongLong() functions
+for compact integers

Objects/longobject.c

@@ -117,15 +117,15 @@ maybe_small_long(PyLongObject *v)
 
 #define PYLONG_FROM_SIGNED(INT_TYPE, ival) \
     do { \
-        unsigned long abs_ival, t; \
+        unsigned INT_TYPE abs_ival, t; \
         if (IS_SMALL_INT(ival)) { \
             return get_small_int((sdigit)(ival)); \
         } \
         if (-(INT_TYPE)PyLong_MASK <= (ival) && (ival) <= (INT_TYPE)PyLong_MASK) { \
             return _PyLong_FromMedium((sdigit)(ival)); \
         } \
         /* Count digits (at least two - smaller cases were handled above). */ \
-        abs_ival = (ival) < 0 ? 0U-(unsigned long)(ival) : (unsigned long)(ival); \
+        abs_ival = (ival) < 0 ? 0U-(unsigned INT_TYPE)(ival) : (unsigned INT_TYPE)(ival); \
         /* Do shift in two steps to avoid possible undefined behavior. */ \
         t = abs_ival >> PyLong_SHIFT >> PyLong_SHIFT; \
         Py_ssize_t ndigits = 2; \
@@ -1456,40 +1456,7 @@ PyLong_AsVoidPtr(PyObject *vv)
 PyObject *
 PyLong_FromLongLong(long long ival)
 {
-    PyLongObject *v;
-    unsigned long long abs_ival, t;
-    int ndigits;
-
-    /* Handle small and medium cases. */
-    if (IS_SMALL_INT(ival)) {
-        return get_small_int((sdigit)ival);
-    }
-    if (-(long long)PyLong_MASK <= ival && ival <= (long long)PyLong_MASK) {
-        return _PyLong_FromMedium((sdigit)ival);
-    }
-
-    /* Count digits (at least two - smaller cases were handled above). */
-    abs_ival = ival < 0 ? 0U-(unsigned long long)ival : (unsigned long long)ival;
-    /* Do shift in two steps to avoid possible undefined behavior. */
-    t = abs_ival >> PyLong_SHIFT >> PyLong_SHIFT;
-    ndigits = 2;
-    while (t) {
-        ++ndigits;
-        t >>= PyLong_SHIFT;
-    }
-
-    /* Construct output value. */
-    v = _PyLong_New(ndigits);
-    if (v != NULL) {
-        digit *p = v->long_value.ob_digit;
-        _PyLong_SetSignAndDigitCount(v, ival < 0 ? -1 : 1, ndigits);
-        t = abs_ival;
-        while (t) {
-            *p++ = (digit)(t & PyLong_MASK);
-            t >>= PyLong_SHIFT;
-        }
-    }
-    return (PyObject *)v;
+    PYLONG_FROM_SIGNED(long long, ival);
 }
 
 /* Create a new int object from a C Py_ssize_t. */