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From: Julian Brown <julian@codesourcery.com>
Subject: Re: Multiple types of load/store: how to create .md rules?
Date: Wed, 4 May 2022 11:07:10 +0100
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On Mon, 02 May 2022 19:10:41 -0700
Andras Tantos <andras@tantosonline.com> wrote:

> To a previous problem I've asked, Andrew Pinski replied that I should
> merge all *movsi patterns into a single one to avoid (in that case)
> strange deletions in the generated assembly. Is that possible here? It
> appears to me that I would need the ability to differentiate the
> different patterns using constraints, but is there a way to define
> custom versions of the 'm' pattern? I didn't find anything on that in
> the documentation. Did I miss something?

Check "define_memory_constraint" in existing ports, i.e.:

https://gcc.gnu.org/onlinedocs/gccint/Define-Constraints.html#index-define_005fmemory_005fconstraint

HTH,

Julian