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Re: [PATCH 1/4] aarch64: Improve epilogue unwind info
- From: Richard Earnshaw <rearnsha at arm dot com>
- To: Jiong Wang <jiong dot wang at arm dot com>, Richard Henderson <rth at redhat dot com>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Cc: Marcus Shawcroft <Marcus dot Shawcroft at arm dot com>
- Date: Thu, 28 Aug 2014 14:59:10 +0100
- Subject: Re: [PATCH 1/4] aarch64: Improve epilogue unwind info
- Authentication-results: sourceware.org; auth=none
- References: <1408745131-24297-1-git-send-email-rth at redhat dot com> <1408745131-24297-2-git-send-email-rth at redhat dot com> <53FC8D7D dot 4 at arm dot com> <53FF2259 dot 7050508 at arm dot com>
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.