From: Ken Jin <kenjin@python.org>
Date: Mon, 16 Mar 2026 13:52:56 +0000 (+0800)
Subject: gh-146018: Disable over-aggressive optimization for _GUARD_CODE_VERSION (GH-145923)
X-Git-Tag: v3.15.0a8~288
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=182aea2f57002dcea39dfdfe3faf642d724dd80b;p=thirdparty%2FPython%2Fcpython.git

gh-146018: Disable over-aggressive optimization for _GUARD_CODE_VERSION (GH-145923)
---

diff --git a/Python/optimizer_bytecodes.c b/Python/optimizer_bytecodes.c
index e0410be55652..f3a391b2e37e 100644
--- a/Python/optimizer_bytecodes.c
+++ b/Python/optimizer_bytecodes.c
@@ -1761,7 +1761,9 @@ dummy_func(void) {
         PyCodeObject *co = get_current_code_object(ctx);
         if (co->co_version == version) {
             _Py_BloomFilter_Add(dependencies, co);
-            REPLACE_OP(this_instr, _NOP, 0, 0);
+            // TODO gh-144651:
+            // If we've previously guarded on this code version in a trace, we
+            // can avoid guarding it again.
         }
         else {
             ctx->done = true;
diff --git a/Python/optimizer_cases.c.h b/Python/optimizer_cases.c.h
index 7e5b26c6d725..942a730e4fac 100644
--- a/Python/optimizer_cases.c.h
+++ b/Python/optimizer_cases.c.h
@@ -4290,7 +4290,6 @@
             PyCodeObject *co = get_current_code_object(ctx);
             if (co->co_version == version) {
                 _Py_BloomFilter_Add(dependencies, co);
-                REPLACE_OP(this_instr, _NOP, 0, 0);
             }
             else {
                 ctx->done = true;