linux-kernel - Re: sparc: bpf_jit: Move four assignments in bpf_jit

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Message-ID: <ec58924c-25d6-e525-fb8a-35bdbf6a8f12@users.sourceforge.net>
Date:   Sun, 4 Sep 2016 07:00:22 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Julian Calaby <julian.calaby@...il.com>
Cc:     sparclinux <sparclinux@...r.kernel.org>,
        Adam Buchbinder <adam.buchbinder@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Rabin Vincent <rabin@....in>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors <kernel-janitors@...r.kernel.org>,
        Julia Lawall <julia.lawall@...6.fr>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: sparc: bpf_jit: Move four assignments in bpf_jit_compile()

> Does this change improve the resulting binary?

I hope so. - I propose to give the refactorings "Reduce scope of variable"
and "Extract a function" (and the corresponding consequences) another look.


> I.e. does it make it smaller or faster?

It is generally possible that a specific code generation variant will also affect
the run time properties you mentioned.


> Otherwise this change is useless churn - you're making the code more
> complicated, longer and harder to read for practically no benefit.

I imagine that there other reasons you could eventually accept
for this use case, aren't there?

Regards,
Markus