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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/112976] New: expand_gimple_stmt_1 vs
 gimple_assign_nontemporal_move_p vs SSA_NAME on lhs
Date: Tue, 12 Dec 2023 01:07:43 +0000
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X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112976

            Bug ID: 112976
           Summary: expand_gimple_stmt_1 vs
                    gimple_assign_nontemporal_move_p vs SSA_NAME on lhs
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: internal-improvement
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

As far as I can tell if TREE_CODE (lhs) =3D=3D SSA_NAME then
gimple_assign_nontemporal_move_p should always be false as it is never a st=
ore.

So all of the code for nontemporal in the else case of `TREE_CODE (lhs) !=3D
SSA_NAME` if in cfgexpand.cc is dead.

This has been there since r0-95521-g28ed065ef9f345 which added expand from
tuples directly.

We most likely should also have gimple_assign_set_nontemporal_move assert t=
hat
the gimple assign's lhs is not a SSA_NAME.=