GH-125912: Teach the JIT's optimizer about _BINARY_OP_INPLACE_ADD_UNICODE (GH-125935)

1 files changed, 19 insertions, 0 deletions

diff --git a/Python/optimizer_cases.c.h b/Python/optimizer_cases.c.h
index 6ec9e69..243b3ef 100644
--- a/Python/optimizer_cases.c.h
+++ b/Python/optimizer_cases.c.h
@@ -484,6 +484,25 @@
         }
 
         case _BINARY_OP_INPLACE_ADD_UNICODE: {
+            _Py_UopsSymbol *right;
+            _Py_UopsSymbol *left;
+            right = stack_pointer[-1];
+            left = stack_pointer[-2];
+            _Py_UopsSymbol *res;
+            if (sym_is_const(left) && sym_is_const(right) &&
+                sym_matches_type(left, &PyUnicode_Type) && sym_matches_type(right, &PyUnicode_Type)) {
+                PyObject *temp = PyUnicode_Concat(sym_get_const(left), sym_get_const(right));
+                if (temp == NULL) {
+                    goto error;
+                }
+                res = sym_new_const(ctx, temp);
+                Py_DECREF(temp);
+            }
+            else {
+                res = sym_new_type(ctx, &PyUnicode_Type);
+            }
+            // _STORE_FAST:
+            GETLOCAL(this_instr->operand) = res;
             stack_pointer += -2;
             assert(WITHIN_STACK_BOUNDS());
             break;