Date: Tue, 28 Apr 2015 03:45:32 +0200 From: Agnieszka Bielec <bielecagnieszka8@...il.com> To: john-dev@...ts.openwall.com Subject: Re: [GSoC] John the Ripper support for PHC finalists 2015-04-27 3:20 GMT+02:00 Solar Designer <solar@...nwall.com>: > What's your understanding as to why interleaving might help, beyond SIMD? I modified php_mt_seed from 2-interleaving variables x and y into 2 functions where one function compute x and second y and I was surprised to see that the speed decreased almost 2 times. I modified also 2-interleaving to version where instructions with y are in reverse order and the version when i removed y and put second x and in the first case the speed was the same but in second case again decreased. It must be only that processor can execute 2 instructions at the same time (where they are independent) and according to wikipedia there is something like pipeline thanks
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