problem using ctypes with MMX intrinsics

[dcharno]

Is it possible to use ctypes with a shared library which uses MMX/SSE 
intrinsics?  I can load the library and access functions inside it, but 
I getting a seg fault when I hit one of the intrinsics.  I'm wondering 
if there might be some sort of stack alignment problem.


I am using gcc version 4.2.3 and Python 2.5.2 on Ubuntu 8.04.

Any suggestions would be helpful.
--
http://mail.python.org/mailman/listinfo/python-list

Re: problem using ctypes with MMX intrinsics

[dcharno]

Robert Kern wrote:
Well, stack alignment would be a problem with how the shared library 
gets compiled, nothing to do with ctypes (I think). However, if you are 


The shared library is built with '-m32 -msse2' and works fine from a 
C/C++ test harness, so I think its compiled okay.


> passing in arrays from ctypes, *they* may also be misaligned. Try to
> check the addresses of the ctypes values you are passing in. I'm not
> entirely sure how to do that, though.

I'm only passing filenames and some string options through the API.  All 
the data that gets processed with MMX/SSE is opened inside the shared 
library.




--
http://mail.python.org/mailman/listinfo/python-list