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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/103756] [12 Regression] -fcompare-debug
 failure (length) with -O -fconserve-stack -frename-registers -fno-tree-ch
 -fira-algorithm=priority since r12-5978-ga888259a71fbbb7f
Date: Tue, 28 Dec 2021 18:00:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103756

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gn=
u.org
             Status|NEW                         |ASSIGNED

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 52079
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52079&action=3Dedit
gcc12-pr103756.patch

Untested fix.=