linux-kernel - Re: [PATCH 0/2] x86: Remove ideal

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Date:   Sat, 13 Mar 2021 14:47:54 +0100
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        rostedt@...dmis.org, hpa@...or.com, torvalds@...uxfoundation.org,
        linux-kernel@...r.kernel.org, linux-toolchains@...r.kernel.org,
        jpoimboe@...hat.com, alexei.starovoitov@...il.com,
        mhiramat@...nel.org
Subject: Re: [PATCH 0/2] x86: Remove ideal_nops[]

On Sat, Mar 13, 2021 at 2:29 PM Borislav Petkov <bp@...en8.de> wrote:
>
> On Sat, Mar 13, 2021 at 01:58:56PM +0100, Sedat Dilek wrote:
> > You can add Debian/experimental APT sources.list ...
>
> I could but I don't expect clang12 to behave any differently here.
>

Agreed in things of build-time.
There were some improvements and optimizations to LLVM/Clang but twice
as slow is really hard compared with GCC.

I was thinking more in the direction of "compatibility" of tip tree
with recent LLVM/Clang other than what is officially supported via
Kbuild-system.

Let me look if I will do a selfmade ThinLTO+PGO optimized LLVM
toolchain v12.0.0-rc3 this weekend.

- Sedat -