llvm dev - Mar 2012 - [LLVMdev] Stack alignment in kernel

I'm running in AVX mode, but the stack before call to kernel is aligned to
16 bit.
Could you, please, tell me where it should be specified?

Thank you.

- Elena


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./llc -mattr=+avx -stack-alignment=16 < basic.ll | grep movaps | grep ymm |
grep rbp
        vmovaps -176(%rbp), %ymm14
        vmovaps -144(%rbp), %ymm11
        vmovaps -240(%rbp), %ymm13
        vmovaps -208(%rbp), %ymm9
        vmovaps -272(%rbp), %ymm7
        vmovaps -304(%rbp), %ymm0
        vmovaps -112(%rbp), %ymm0
        vmovaps -80(%rbp), %ymm1
        vmovaps -112(%rbp), %ymm0
        vmovaps -80(%rbp), %ymm0
        vmovaps -176(%rbp), %ymm15
        vmovaps -144(%rbp), %ymm0
        vmovaps -240(%rbp), %ymm0
        vmovaps -208(%rbp), %ymm0
        vmovaps -272(%rbp), %ymm0
        vmovaps -304(%rbp), %ymm0

vmovaps should not access stack if it is not aligned to 32

- Elena

-----Original Message-----
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of Demikhovsky, Elena
Sent: Thursday, March 01, 2012 02:59
To: llvmdev at cs.uiuc.edu
Subject: [LLVMdev] Stack alignment in kernel

I'm running in AVX mode, but the stack before call to kernel is aligned to
16 bit.
Could you, please, tell me where it should be specified?

Thank you.

- Elena


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Intel Israel (74) Limited

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the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.


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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