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Date: Sat, 14 Mar 2015 22:01:50 +0300
From: Solar Designer <>
Subject: Re: interleaved bitslice? (was: bitslice MD*/SHA*, AVX2)

On Thu, Mar 12, 2015 at 08:37:01AM +0100, magnum wrote:
> On 2015-03-11 21:55, Solar Designer wrote:
> > solar@...l:~/md5slice$ gcc md5slice.c -o md5slice -Wall -s -O3 -fomit-frame-pointer -funroll-loops -DVECTOR -march=native
> > 
> > This gave "warning: always_inline function might not be inlinable" about
> > FF(), I(), H(), F(), add32r(), add32c(), add32() - but then it built
> > fine.  The speed is:
> Solar,
> While experimenting with this I noticed using a vector size of 32 but
> still compiling for AVX gave a slight boost (~5%). I assume this ends up
> similar to the interleaving we use in Jumbo, and is faster for the same
> reasons.

I've just tested this with gcc 4.9.2 on Linux, and the generated code is
"floating-point" 256-bit AVX.  So this is not interleaving.


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