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Message-ID: <20150725170013.GB2685@openwall.com>
Date: Sat, 25 Jul 2015 19:00:13 +0200
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: PHC: yescrypt on GPU
On Sat, Jul 25, 2015 at 06:17:06PM +0200, Agnieszka Bielec wrote:
> today I was removing getting smaller and smaller parts of the code to
> track down the slow part
> and this is indeed in pwxform, and when I have
> x0 += p0[0];
> x0 ^= p1[0];
> [...]
> x1 += p0[1];
> x1 ^= p1[1];
>
> commented out speed is the same with copying and without
This makes sense. In fact, the compiler might be optimizing out the
copying when the copied data is not used at all.
> (but I have another version of pwxform using vectors now)
Of course, you should be using 128-bit vectors (assuming the current
pwxform settings).
Alexander
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