MOVDQA generated for unaligned address

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Tim Lewis - 20 Jun 2006 20:18 GMT

Using Visual Studio 2005 C++ compiler, I am getting a MOVDQA(in x64 mode)
generated on an unaligned stack address. I actually have a debug screen shot
showing RSP being set correctly at the start of the function.

Here is the code:

; RSP = FFFB00 here, all numbers are in hex
mov qword ptr [rsp+18], r8
mov qword ptr [rsp+10], rdx
mov qword ptr [rsp+8], rcx
push rbx
push rbp
push rsi
push rdi
mov rax, rsp
sub rsp, 00000978
xor ebp, ebp
movdqa [rax-18], xmm6 ; exception generated here

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Carl Daniel [VC++ MVP] - 20 Jun 2006 21:08 GMT

> Using Visual Studio 2005 C++ compiler, I am getting a MOVDQA(in x64 mode)
> generated on an unaligned stack address. I actually have a debug screen
> shot
> showing RSP being set correctly at the start of the function.

You should submit bug reports through Connect:

http://connect.microsoft.com/site/sitehome.aspx?SiteID=210

I'm sure someone from the compiler team looking into the issue would need to
see the source code that resulted in the improper code generation.

Additionally, you might want to contact Product Support to see if a hotfix
is available:

http://msdn.microsoft.com/visualc/support/

-cd

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MOVDQA generated for unaligned address

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