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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/99395] s116 benchmark of TSVC is vectorized
 by clang and not by gcc
Date: Mon, 09 Oct 2023 06:30:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99395

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2021-03-05 00:00:00         |2023-10-9

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to JuzheZhong from comment #6)
> Hi, Richi.
>=20
> Recently, I am evaluating TSVC performance of GCC:
>=20
> I found both RISC-V and aarch64 can SLP vectorize it:
>=20
> https://godbolt.org/z/ssvTxxjeT
>=20
> Both GCC-13 and trunk GCC can SLP it like LLVM (GCC-12 failed) but with
> -fno-vect-cost-model.
>=20
> I suspect we should adjust Vector COST model (I don't think we should aju=
st
> cost
> model in target backend since LLVM by default vectorize such case).

We are only vectorizing part of the scalar code.  The CSE issue still exist=
s,
so is the resulting loop analysis issues.=