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Date: Wed, 8 Sep 2021 12:07:12 +0200
From: Jakub Jelinek <jakub@redhat.com>
To: Hongtao Liu <crazylht@gmail.com>
Cc: Uros Bizjak <ubizjak@gmail.com>, liuhongt <hongtao.liu@intel.com>,
 "H.J. Lu" <hjl.tools@gmail.com>, GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] i386: Fix up @xorsign<mode>3_1 [PR102224]
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On Wed, Sep 08, 2021 at 06:00:50PM +0800, Hongtao Liu wrote:
> And I find paradoxical subreg like (subreg:V4SF (reg:SF)) are not
> allowed by validate_subreg until r11-621.

My reading of the r11-621 change is that it allowed (subreg:V4SF (reg:V2SF) 0)
but that (subreg:V4SF (reg:SF) 0) has been valid even before that.
In any case, the PR89984 fix was a missed-optimization fix, so we don't need
to backport that and thus don't need to backport the follow-up patch either.

	Jakub