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Re: optimization/8049: SSE unaligned vector stores crash with -O0
> On Thu, 10 Oct 2002, Jan Hubicka wrote:
>
> > > On 10 Oct 2002 hubicka@gcc.gnu.org wrote:
> > >
> > > > Synopsis: SSE unaligned vector stores crash with -O0
> > > >
> > > > State-Changed-From-To: open->closed
> > > > State-Changed-By: hubicka
> > > > State-Changed-When: Thu Oct 10 09:45:59 2002
> > > > State-Changed-Why:
> > > > It is runtime bug to not align stack properly for main.
> > > > It will go away with runtime compiled using gcc 3.2 or can be workarounded by avoiding vector stuff in main.
> > > >
> > > > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8049
> > >
> > > I see this in functions that are not main(). Didn't I provide an example
> > > of one?
> >
> > I didn't see it. Can you send me some?
>
> The original example is one. The three buffers passed into MatrixMultiply
> happen to be aligned on my system. The actual crash happens when the stack
> copy of C1 is loaded, before the _mm_store_ps (uninlined) function is
> called.
This looks strange. All stores to C1 works properly and then you get
movaps crash when you load it to store into output?
I believe it is the output that is missaligned (destination of store)
because the destination array is missaligned from the caller.
Honza
>
> Ian
>
> ---------------------------------------------------
> Ian Ollmann, Ph.D. iano@cco.caltech.edu
> ---------------------------------------------------