Microoptimize small range iteration.

serhiy-storchaka · Nov 30, 2022 · Aug 27, 2021 · Aug 27, 2021 · Aug 29, 2021 · Aug 29, 2021
commit 10822c03ddf124c7e99f820366531d7344713bcc
diff --git a/Objects/rangeobject.c b/Objects/rangeobject.c
@@ -758,7 +758,7 @@ rangeiter_next(_PyRangeIterObject *r)
 {
     if (r->len > 0) {
         long result = r->start;
-        r->start += r->step;
+        r->start = result + r->step;
         r->len--;
         return PyLong_FromLong(result);
     }

@@ -2627,7 +2627,7 @@ dummy_func(
             }
             else {
                 long value = r->start;
-                r->start += r->step;
+                r->start = value + r->step;
                 r->len--;
                 if (_PyLong_AssignValue(&GETLOCAL(_Py_OPARG(next)), value) < 0) {
                     goto error;

diff --git a/Python/generated_cases.c.h b/Python/generated_cases.c.h