From: "ron minnich" <rminnich@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@9fans.net>
Subject: Re: [9fans] when is a branch not a branch?
Date: Mon, 2 Jun 2008 15:37:12 -0700 [thread overview]
Message-ID: <13426df10806021537j33f0ea92xabb8b023889b48cc@mail.gmail.com> (raw)
In-Reply-To: <fb8482fe3eaae0c339f065a29ca498dc@coraid.com>
On Mon, Jun 2, 2008 at 3:13 PM, Brantley Coile <brantley@coraid.com> wrote:
>> OK, let's modify b: a little as follows;
>> b:
>> #if JMP > 0
>> jmp bb
>> #if JMP > 1
>> call b
>> #if JMP > 2
>> call b
>> #if JMP > 3
>> call b
>> #endif
>> #endif
>> #endif
>> #endif
>> bb:
>
> I'm lost. So the calls never get called--they just
> make the jmp reach farther?
>
yep. just a spacer.
Actually this lack of a delta in time is a good thing. It just
surprised me, I was getting ready to argue that the cost of time in
the branch was "not that bad" compared to the alternatives, and then
it goes negative on me :-)
ron
next prev parent reply other threads:[~2008-06-02 22:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-02 21:55 ron minnich
2008-06-02 22:04 ` Charles Forsyth
2008-06-02 22:35 ` ron minnich
2008-06-02 22:50 ` Charles Forsyth
2008-06-02 22:55 ` Charles Forsyth
2008-06-02 23:29 ` ron minnich
2008-06-05 20:19 ` dave.l
2008-06-02 22:13 ` Brantley Coile
2008-06-02 22:37 ` ron minnich [this message]
2008-06-02 22:22 ` Roman Shaposhnik
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