From: Stefan Behnel <scoder@users.berlios.de>
Date: Sun, 29 Mar 2009 16:44:04 +0000 (+0200)
Subject: optimise dict(some_dict) into a call to PyDict_Copy()
X-Git-Tag: 0.12.alpha0~347
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=b3660978c58c9deab2653b74dc40859b3f62b7ba;p=cython.git

optimise dict(some_dict) into a call to PyDict_Copy()
---

diff --git a/Cython/Compiler/Optimize.py b/Cython/Compiler/Optimize.py
index 3fcc03ad..f009f49f 100644
--- a/Cython/Compiler/Optimize.py
+++ b/Cython/Compiler/Optimize.py
@@ -515,6 +515,25 @@ class OptimiseBuiltinCalls(Visitor.VisitorTransform):
             return node
         return kwargs
 
+    PyDict_Copy_func_type = PyrexTypes.CFuncType(
+        Builtin.dict_type, [
+            PyrexTypes.CFuncTypeArg("dict", Builtin.dict_type, None)
+            ])
+
+    def _handle_simple_function_dict(self, node, pos_args):
+        """Replace dict(some_dict) by PyDict_Copy(some_dict).
+        """
+        if len(pos_args.args) != 1:
+            return node
+        if pos_args.args[0].type is not Builtin.dict_type:
+            return node
+
+        return ExprNodes.PythonCapiCallNode(
+            node.pos, "PyDict_Copy", self.PyDict_Copy_func_type,
+            args = pos_args.args,
+            is_temp = node.is_temp
+            )
+
     def _handle_simple_function_set(self, node, pos_args):
         """Replace set([a,b,...]) by a literal set {a,b,...}.
         """