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From: "pan2.li at intel dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109535] internal compiler error: in
 finalize_new_accesses, at rtl-ssa/changes.cc:471
Date: Mon, 17 Apr 2023 14:04:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109535

Li Pan <pan2.li at intel dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pan2.li at intel dot com

--- Comment #6 from Li Pan <pan2.li at intel dot com> ---
(In reply to rsandifo@gcc.gnu.org from comment #2)
> The assert in question fires if the pass creates an instruction
> whose pattern uses a register or memory and if the pass doesn't
> provide associated use information.  Let me know if it looks like
> a bug in rtl-ssa rather than a bug in the vsetvl pass.

Just sync with juzhe for the assertion failure. It tries to find the regno=
=3D8 in
the shared_uses=3D[0, 66, 67] in function_info::finalize_new_accesses. And =
then
it will hit the NOT_NULL assert.

While in the pass_vsetvl::cleanup_insns, it will clean up the AVL use simil=
ar
as below.

AVL regno 8
Before Uses Reg Nums =3D> [0,8,66,67,]
After  Uses Reg Nums =3D> [0,66,67,]

After vsetvl, the avl-related use, aka use Regno=3D8 will be removed, becau=
se the
instruction pattern in RVV will eliminate the dependencies of the operand.

Juzhe can help to correct me if any misleading or misunderstanding.

Thanks.=