[SOT] Skip restore same stack arg when fallback (#72367)

Author: SigureMo

python/paddle/jit/sot/opcode_translator/executor/function_graph.py

@@ -390,10 +390,15 @@ def _restore_origin_opcode(self, stack_vars, store_var_info, instr_idx):
  self.pycode_gen.gen_enable_eval_frame()
 
  name_gen = NameGenerator("___graph_fn_saved_orig_")
+ stored_var_ids = set()
 
  # here is not update changed values, it just give names to stack vars
  # and want keep same interface as _build_compile_fn_with_name_store
  for var in stack_vars[::-1]:
+ if var.id in stored_var_ids:
+ self.pycode_gen.gen_pop_top()
+ continue
+ stored_var_ids.add(var.id)
  if not store_var_info.get(var.id, []):
  name = name_gen.next()
  store_var_info.setdefault(var.id, [])

test/sot/test_min_graph_size.py

@@ -84,6 +84,15 @@ def get_arg_from_kwargs(x, **kwargs):
  return x, y
 
 
+def add_with_breakgraph(x, y):
+ sot.psdb.breakgraph()
+ return x + y
+
+
+def restore_same_arg_when_fallback(x):
+ return add_with_breakgraph(x, x)
+
+
 class TestMinGraphSize(TestCaseBase):
  @min_graph_size_guard(10)
  def test_cases(self):
@@ -116,6 +125,11 @@ def test_get_arg_from_kwargs(self):
  self.assert_results(get_arg_from_kwargs, None)
  self.assert_results(get_arg_from_kwargs, None, y=1)
 
+ @min_graph_size_guard(10)
+ def test_restore_same_arg_when_fallback(self):
+ x = paddle.to_tensor(1)
+ self.assert_results(restore_same_arg_when_fallback, x)
+
 
 if __name__ == "__main__":
  unittest.main()