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From: "ams at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/103396] [12 Regression][GCN][BUILD] ICE RTL check:
 access of elt 4 of vector with last elt 3 in move_callee_saved_registers, at
 config/gcn/gcn.c:2821
Date: Wed, 24 Nov 2021 12:30:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103396

Andrew Stubbs <ams at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-11-24
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |ams at gcc dot gnu.=
org
     Ever confirmed|0                           |1

--- Comment #4 from Andrew Stubbs <ams at gcc dot gnu.org> ---
I think I have a fix for this. It happens when the link register has to be
saved because it is used implicitly by a function call, but the register is
never explicitly mentioned anywhere else in the function. I don't know why =
this
hasn't been a problem before now?=