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Date: Sat, 14 Jul 2012 15:25:01 +0400
From: Solar Designer <>
To: Tavis Ormandy <>
Subject: Re: Rotate and bitselect investigation

On Sat, Jul 14, 2012 at 03:13:49PM +0400, Solar Designer wrote:
> I am not seeing better results on Intel CPUs than what I get on AMD with
> XOP.  For example, here's what I am getting on "Intel(R) Xeon(R) CPU
> E31230 @ 3.20GHz" (Sandy Bridge, but without AVX), apparently at 3.3 GHz,
> gcc 4.6.2:
> Benchmarking: Raw SHA-1 (pwlen <= 15) [128/128 SSE2 intrinsics 4x]...  DONE
> Raw:    17892K c/s real, 17892K c/s virtual

Apparently, E31230 does have AVX, but the RHEL5'ish kernel on that
machine does not make it available.  Anyway, here's SSE4.1 build:

Benchmarking: Raw SHA-1 (pwlen <= 15) [128/128 SSE4.1 intrinsics 4x]...  DONE
Raw:    17881K c/s real, 17881K c/s virtual

No speedup from SSE2 somehow.


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