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Message-ID: <CA+EaD-ZiiagybVUKw3z8k5aeur_md1BhaS30suY5FZCzN7SYcg@mail.gmail.com>
Date: Mon, 24 Jun 2013 16:54:45 +0200
From: Katja Malvoni <kmalvoni@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: Parallella: bcrypt
Hello,
On Tue, May 28, 2013 at 1:58 AM, Solar Designer <solar@...nwall.com> wrote:
> Katja, Yaniv -
>
> On Sun, May 26, 2013 at 07:37:55PM -0400, Yaniv Sapir wrote:
> > Here's a couple command line options you can try when compiling the code.
> > Please look at the manual for further details.
> >
> > -mfp-mode=int # this sets the FPU mode to integer. However, please
> > make sure that the generated code does not re-program the CONFIG register
> > before every integer operation
>
> Let's definitely try this. I was afraid we'd have to resort to assembly
> code to use the FPU in integer mode - it's great news to me that we seem
> not to have to.
>
Unfortunately, this doesn't help a lot... Execution speed with -02 is
45.969000 ms and with -mfp-mode=int is 45.951000 ms. I checked generated
assembly code it seems that CONFIG register isn't re-programmed before
every integer operation.
>
> > -O3
> > -Ofast # e-gcc supports this level too
>
> We can try these too, but I don't expect much/any advantage over -O2.
>
Actually these two made it even slower, 50.725000 ms with -O3 and
50.688000 ms with -Ofast
>
> -falign-loops=8 and -falign-functions=8 are worth trying. (The latter
> should only make a measurable difference with the size-optimized
> implementation, where a portion of code has been moved into a separate
> function that is called from several places.)
>
>
These also didn't help - 46.504000 ms with -falign-loops=8 and 46.542000 ms
with -falign-functions=8
I attached output for every used command line option with code sizes.
Katja
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