python
diff --git a/‎Python/optimizer_bytecodes.c
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+10-2Lines changed: 10 additions & 2 deletions b/‎Python/optimizer_bytecodes.c
Copy file name to clipboardExpand all lines: Python/optimizer_bytecodes.c
+10-2Lines changed: 10 additions & 2 deletions
diff --git a/‎Python/optimizer_cases.c.h
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+10-1Lines changed: 10 additions & 1 deletion b/‎Python/optimizer_cases.c.h
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+10-1Lines changed: 10 additions & 1 deletion
@@ -1088,8 +1088,16 @@ dummy_func(void) {
         res = sym_new_type(ctx, &PyLong_Type);
     }
 
-    op(_GET_LEN, (-- len)) {
-        len = sym_new_type(ctx, &PyLong_Type);
+    op(_GET_LEN, (obj -- obj, len)) {
+        int tuple_length = sym_tuple_length(obj);
+        if (tuple_length == -1) {
+            // Unknown length
+            len = sym_new_type(ctx, &PyLong_Type);
+        }
+        else {
+            assert(tuple_length >= 0);
+            len = sym_new_const(ctx, PyLong_FromLong(tuple_length));
+        }
     }
 
     op(_GUARD_CALLABLE_LEN, (callable, unused, unused -- callable, unused, unused)) {