From a0ea7a116ce52a178c02d42b684089758bd7f355 Mon Sep 17 00:00:00 2001
From: Dennis Sweeney <36520290+sweeneyde@users.noreply.github.com>
Date: Fri, 1 Apr 2022 06:23:42 -0400
Subject: bpo-47009: Streamline list.append for the common case (GH-31864)

---
 Python/ceval.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

(limited to 'Python/ceval.c')

diff --git a/Python/ceval.c b/Python/ceval.c
index 8f73ea1c01..8c1f21b086 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -2213,10 +2213,7 @@ handle_eval_breaker:
         TARGET(LIST_APPEND) {
             PyObject *v = POP();
             PyObject *list = PEEK(oparg);
-            int err;
-            err = PyList_Append(list, v);
-            Py_DECREF(v);
-            if (err != 0)
+            if (_PyList_AppendTakeRef((PyListObject *)list, v) < 0)
                 goto error;
             PREDICT(JUMP_BACKWARD_QUICK);
             DISPATCH();
@@ -5044,14 +5041,12 @@ handle_eval_breaker:
             DEOPT_IF(!PyList_Check(list), PRECALL);
             STAT_INC(PRECALL, hit);
             SKIP_CALL();
-            PyObject *arg = TOP();
-            int err = PyList_Append(list, arg);
-            if (err) {
+            PyObject *arg = POP();
+            if (_PyList_AppendTakeRef((PyListObject *)list, arg) < 0) {
                 goto error;
             }
-            Py_DECREF(arg);
             Py_DECREF(list);
-            STACK_SHRINK(2);
+            STACK_SHRINK(1);
             Py_INCREF(Py_None);
             SET_TOP(Py_None);
             Py_DECREF(callable);
-- 
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