phc-discussions - Re: [PHC] Updated tests document

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Message-ID: <20150414151905.GA4356@openwall.com>
Date: Tue, 14 Apr 2015 18:19:05 +0300
From: Solar Designer <solar@...nwall.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Updated tests document

Milan,

On Tue, Apr 07, 2015 at 08:02:36AM +0200, Milan Broz wrote:
> BTW simd version seems to not "easily" provide way how to decrease
> PWXrounds (in other two it is just define, here is more complex macro IIRC).

In current yescrypt-simd.c, it's this macro:

#define PWXFORM \
	{ \
		PWXFORM_X_T x0, x1, x2, x3; \
		__m128i s00, s01, s10, s11, s20, s21, s30, s31; \
		PWXFORM_ROUND PWXFORM_ROUND \
		PWXFORM_ROUND PWXFORM_ROUND \
		PWXFORM_ROUND PWXFORM_ROUND \
	}

You simply delete any number of instances of PWXFORM_ROUND from it,
leaving at least one.  For example, this works:

#define PWXFORM \
	{ \
		PWXFORM_X_T x0, x1, x2, x3; \
		__m128i s00, s01, s10, s11, s20, s21, s30, s31; \
		PWXFORM_ROUND \
	}

I should probably turn this into a loop to make such tuning easier.

Alexander