[pypy-svn] pypy jitypes2: add a performance hack

[antocuni]

Author: Antonio Cuni <anto.cuni at gmail.com>
Branch: jitypes2
Changeset: r40727:4b3cb1021874
Date: 2011-01-16 18:34 +0100
http://bitbucket.org/pypy/pypy/changeset/4b3cb1021874/

Log:	add a performance hack

diff --git a/lib_pypy/_ctypes/function.py b/lib_pypy/_ctypes/function.py
--- a/lib_pypy/_ctypes/function.py
+++ b/lib_pypy/_ctypes/function.py
@@ -384,6 +384,12 @@
         Convert from low-level repr of the result to the high-level python
         one.
         """
+        # hack for performance: if restype is a "simple" primitive type, don't
+        # allocate the buffer because it's going to be thrown away immediately
+        from _ctypes.primitive import _SimpleCData
+        if restype.__bases__[0] is _SimpleCData and not restype._is_pointer_like():
+            return result
+        #
         shape = restype._ffishape
         if is_struct_shape(shape):
             buf = result