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Re: RFC: Very long alternative lists for RTL patterns like move

From: Jeff Law <law at redhat dot com>
To: Segher Boessenkool <segher at kernel dot crashing dot org>
Cc: Michael Meissner <meissner at linux dot vnet dot ibm dot com>, gcc-help at gcc dot gnu dot org, dje dot gcc at gmail dot com, richard dot earnshaw at arm dot com, rguenther at suse dot de, rth at redhat dot com, jakub at redhat dot com, joseph at codesourcery dot com, bschmidt at redhat dot com, wilson at tuliptree dot org, marcus dot shawcroft at arm dot com, ubizjak at gmail dot com, hubicka at ucw dot cz, nickc at redhat dot com, uweigand at de dot ibm dot com, Andreas dot Krebbel at de dot ibm dot com, vmakarov at redhat dot com, wschmidt at linux dot vnet dot ibm dot com, rdsandiford at googlemail dot com
Date: Mon, 14 Mar 2016 14:33:12 -0600
Subject: Re: RFC: Very long alternative lists for RTL patterns like move
Authentication-results: sourceware.org; auth=none
References: <20160314192950 dot GA20247 at ibm-tiger dot the-meissners dot org> <56E71282 dot 1030005 at redhat dot com> <20160314195540 dot GA25774 at gate dot crashing dot org>

On 03/14/2016 01:55 PM, Segher Boessenkool wrote:

One thought I've had is to have a define_alternative meta patterns.
Something like:

Can't hurt to try.

The other thing to ponder is whether or not we have to continue to have
a single movXX insn handle all the possible constraints in a world where
we're using LRA rather than reload.


It is still needed with current IRA/LRA, but perhaps that can be changed.

Sigh.  Too bad..

That would be lovely!  (add<mode>3 is still a bit special as well?)

Yes, I think so.

jeff

References:
- RFC: Very long alternative lists for RTL patterns like move
  - From: Michael Meissner
- Re: RFC: Very long alternative lists for RTL patterns like move
  - From: Jeff Law
- Re: RFC: Very long alternative lists for RTL patterns like move
  - From: Segher Boessenkool

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