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Re: optimization/8049: SSE unaligned vector stores crash with -O0

From: Jan Hubicka <jh at suse dot cz>
To: Ian Ollmann <iano at cco dot caltech dot edu>
Cc: Jan Hubicka <jh at suse dot cz>, hubicka at gcc dot gnu dot org,gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, gcc-gnats at gcc dot gnu dot org
Date: Fri, 11 Oct 2002 11:32:48 +0200
Subject: Re: optimization/8049: SSE unaligned vector stores crash with -O0
References: <20021010192058.GE9659@atrey.karlin.mff.cuni.cz> <Pine.SGI.4.40.0210101224530.13948-100000@helix2.caltech.edu>

> On Thu, 10 Oct 2002, Jan Hubicka wrote:
> 
> > This really is load, however it is stored previously as:
> > > 0x80484c9 <MatrixMultiply+177>:	movaps %xmm0,0xffffff68(%ebp)
> 
> Why is that a store and this a load?
> 
> 	0x804888b <MatrixMultiply+1139> 	movaps %xmm0, 0x4 (%esp,1)

I see, I got confused by the disassembly.
I tought you are getting trap on the previous load, not on this store.
In this case it is not start frame that is misaligned, but outgoing
argument area is that looks like unrelated bug.  (we crash during
storing the argument for function call, not during reading the stack
frame copy of C1). I will check what is going on here.

Thanks,
Honza
> 
> 
> ---------------------------------------------------
>    Ian Ollmann, Ph.D.       iano@cco.caltech.edu
> ---------------------------------------------------

References:
- Re: optimization/8049: SSE unaligned vector stores crash with -O0
  - From: Jan Hubicka
- Re: optimization/8049: SSE unaligned vector stores crash with -O0
  - From: Ian Ollmann

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