From: Sebastian Gniazdowski <sgniazdowski@gmail.com>
To: Daniel Shahaf <d.s@daniel.shahaf.name>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: [PATCH] ztrsub() execution time / 2
Date: Wed, 17 Oct 2018 21:02:18 +0200 [thread overview]
Message-ID: <CAKc7PVDWKTwaV-4iMOA0NjBVRMfhu211AYUw5Z9VPS4AmX1x7Q@mail.gmail.com> (raw)
In-Reply-To: <20181017142503.ueqgcyljm3aalitf@tarpaulin.shahaf.local2>
On Wed, 17 Oct 2018 at 16:25, Daniel Shahaf <d.s@daniel.shahaf.name> wrote:
> As far as I can tell, this patch is the sort of transformation that an
> optimizing compiler should do by itself. In fact, I'm having a hard time
> seeing how the sequence of "BRANCH IF EQUAL" / "BRANCH IF NOT EQUAL" /
> "INCREMENT" assembly instructions would be altered by the patch.
>
> If your profiling was performed on zsh compiled with -O3, I would suggest that
> you file a bug against your compiler's optimizer.
Why not "do it right, then do it yourself"? Why ignore -O0 zsh users?
Should I subscribe to compilers mailing lists and investigate this
well defined 1-line change, i.e. possible to grasp by logic?
--
Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
Blog: http://zdharma.org
next prev parent reply other threads:[~2018-10-17 19:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-17 4:29 Sebastian Gniazdowski
2018-10-17 14:25 ` Daniel Shahaf
2018-10-17 19:02 ` Sebastian Gniazdowski [this message]
2018-10-17 19:34 ` Daniel Shahaf
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