[LLVMdev] PR400 - alignment for LD/ST

[Devang Patel]

On Mar 29, 2007, at 2:42 PM, Christopher Lamb wrote:

> I'm not really sure exactly what's left to do to fully implement  
> what I need. I had assumed that this work would allow me to  
> determine if a LD/ST was based on an aligned pointer or not, but  
> this seems now like the tip of the iceberg.
>
> I'm hoping that I can declare aligned types and retain that  
> information when I pass a pointer to one of these types to  
> function, or declare a pointer to an aligned type as a local  
> variable. It seems that implementing this not only requires the  
> alignment attribute on loads and stores (in the LLVM bc) but  
> propagation of this information from the frontend.

AFAIU, tasks are:

1) Update LLVM LD/ST instructions to maintain alignment information
2) Update FE to provide alignment info for LD/ST instructions if it  
is determined that memory reference is not aligned naturally.
3) Update target specific code gens to respect alignment information  
associated with LD/ST

-
Devang

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