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Re: [PATCH 1/4] aarch64: Improve epilogue unwind info


On 28/08/14 13:36, Jiong Wang wrote:

> I am curious about why "dwarf2out_frame_debug_expr" only handle PRE/POST_MODIFY on dest
> while no handling on src ?
> 
> for example the following rule:
> (set reg (mem_post_modify sp offset))
> 



Probably because dwarf2out was originally written to handle just the
prologue code; and in that case you would only get writes to the stack,
not reads from it.

R.


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