Re: [pygame] "import pygame" crashes with svn build

[Lenard Lindstrom <len-l@xxxxxxxxx>]

Hi Lorenz,

Yes, it is supposed to be summer where I am too, and actually was hot 
for awhile, but not now. Anyway, to make sure I am clear on this, Rev. 
1658 crashes when the transform module is imported, but earlier 
revisions work. I assume this means pygame.transform.smoothscale also 
works. So I am guessing it is the call to the SDL function SDL_HasSSE 
that is causing the problem. The attached patch to transform.c, Rev 2447 
(release candidate 2) removes the SDL_HasSSE call for 64bit intels. 
Would you give it a try? If it works I will commit it to SVN. It is not 
ideal, but at least smoothscale will still use MMX.

Lenard

Lorenz Quack wrote:
> Hey Lenard,
>
> sorry for the long delays but I'm quite busy these days plus the good 
> weather... not many PC hours left.
>
> Lenard Lindstrom wrote:
> > Hi Lorenz,
> >
> > Could you try dropping in SVN rev 1912 of transform.c instead. This 
> > predates the Python 3 updates. This is kind of reaching, but it will 
> > narrow down the search.
>
> I tried this out and poked some more at it and it doesn't seem to be 
> py3k related but rather MMX/SSE.
> The transform.c rev 1657 works and 1658 breaks.
> Also if I comment out "#define SCALE_MMX_SUPPORT" in any version it 
> works.
>
> I don't get this. I keep thinking that something must be wrong with 
> _my_ system otherwise someone else
> must have encountered this as well.
> The only thing I could possibly think of is that I installed the 
> sdl-gfx package without the "mmx" USE-flag
> (I'm running Gentoo) because it is not available on amd64 architecture.
>
> By the way. I also tried commenting out all the asm stuff in 
> scale_mmx64.c but it would still crash.
> So maybe it is something that is going on in transform.c but related 
> to MMX/SSE
>
> If you have any other ideas let me know.
>
> yours
> //Lorenz
>
>
> > Thanks,
> >
> > Lenard
> >
> > Lorenz Quack wrote:
> > > Hi again,
> > >
> > > > you figured this out yet?
> > >
> > > not 100% but at least now I get it to compile by following your advice:
> > > > Easiest way to work around it...
> > > >   Comment out import transform lines in the file:
> > > >       site-packages/pygame/__init__.py
> > > [...]
> > > > Perhaps try commenting out the sse/mmx parts?
> > >
> > > that seems to be the problem. If I comment out
> > >
> > > #       include "scale_mmx64.c"
> > >
> > > in "scale_mmx.c" it compiles. if I import pygame the interpreter 
> > > naturally
> > > complains about undefined symbols but as long as I don't use the 
> > > transform
> > > module it seems to work this way as well. of course this is not a 
> > > solution.
> > >
> > > For debugging purposes I tried to remove all SSE/MMX code and simply 
> > > implement
> > > empty dummy functions like this:
> > >
> > > void filter_shrink_X_MMX(Uint8 *srcpix, Uint8 *dstpix, int height, 
> > > int srcpitch,
> > >                          int dstpitch, int srcwidth, int dstwidth) {}
> > >
> > > that also crashed. I find this very confusing and frustrating. So I 
> > > settle with
> > > the work around for now.
> > >
> > >
> > > thanks again for the help and if I can help with some debug 
> > > information or if you
> > > have any ideas let me know.
> > >
> > > yours
> > > //Lorenz