[LLVMdev] Stack alignment on X86 AVX seems incorrect

[Joerg Sonnenberger]

On Thu, Mar 01, 2012 at 07:44:42PM +0000, Demikhovsky, Elena wrote:
> When stack is unaligned, LLVM should generate vmovups instead of vmovaps.

That's the question I have asked. If LLVM believes the stack is aligned,
the choice is correct.

Joerg

> 
> - Elena
> 
> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Joerg Sonnenberger
> Sent: Thursday, March 01, 2012 20:31
> To: llvmdev at cs.uiuc.edu
> Subject: Re: [LLVMdev] Stack alignment on X86 AVX seems incorrect
> 
> On Thu, Mar 01, 2012 at 06:16:46PM +0000, Demikhovsky, Elena wrote:
> > vmovaps should not access stack if it is not aligned to 32
> 
> I'm not completely sure I understand your problem. Are you saying that
> the generated code assumes 256bit alignment, your default stack
> alignment is 128bit and LLVM doesn't adjust it automatically?
> 
> Joerg
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