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From: "rdapp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114027] [14] RISC-V vector: miscompile at -O3
Date: Thu, 22 Feb 2024 08:57:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114027

Robin Dapp <rdapp at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu.org
   Last reconfirmed|                            |2024-2-22
             Target|riscv                       |x86_64-*-* riscv*-*-*
                   |                            |aarch64-*-*

--- Comment #5 from Robin Dapp <rdapp at gcc dot gnu.org> ---
To me it looks like we interpret e.g. c_53 =3D _43 ? prephitmp_13 : 0 as th=
e only
reduction statement and simplify to MAX because of the wrong assumption that
this is the only reduction statement in the chain when we actually have
several.=20
(See "condition expression based on compile time constant").

--- Comment #6 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Btw this fails on x86 and aarch64 for me with -fno-vect-cost-model.  So it
definitely looks generic.=