From: Stefan Behnel <scoder@users.berlios.de>
Date: Sun, 21 Mar 2010 19:50:08 +0000 (+0100)
Subject: drop redundant C->Py->C coercions after optimisations
X-Git-Tag: 0.13.beta0~263
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=7a738fd026fd4cd08158f4bd4570130e590d8658;p=cython.git

drop redundant C->Py->C coercions after optimisations
---

diff --git a/Cython/Compiler/Optimize.py b/Cython/Compiler/Optimize.py
index 5d587160..85a405a8 100644
--- a/Cython/Compiler/Optimize.py
+++ b/Cython/Compiler/Optimize.py
@@ -962,6 +962,11 @@ class OptimizeBuiltinCalls(Visitor.EnvTransform):
                 return arg
             else:
                 return arg.coerce_to(node.type, self.env_stack[-1])
+        if isinstance(arg, ExprNodes.CoerceToPyTypeNode):
+            if arg.type is PyrexTypes.py_object_type:
+                if node.type.assignable_from(arg.arg.type):
+                    # completely redundant C->Py->C coercion
+                    return arg.arg.coerce_to(node.type, self.env_stack[-1])
         if not isinstance(arg, ExprNodes.SimpleCallNode):
             return node
         if not (node.type.is_int or node.type.is_float):