Date: Sun, 26 Jul 2015 17:27:29 +0200 From: Agnieszka Bielec <bielecagnieszka8@...il.com> To: john-dev@...ts.openwall.com Subject: Re: PHC: Lyra2 vs yescrypt benchmarks 2 2015-07-26 16:11 GMT+02:00 Solar Designer <solar@...nwall.com>: > Agnieszka, > > On Sun, Jul 26, 2015 at 04:02:19PM +0200, Agnieszka Bielec wrote: >> my undestranding was that when intrinsic are in SSE2 but AVX is >> avalialbe they are compiled to AVX, > > Yes, although that's only part of the story. sometimes compilers can mix AVX and SSE2 (I am not sure) > >> and similarly SSE4 -> AVX2 > > No. This indicates that you don't understand what SSE4 is, and what > AVX2 is. Please read up on them, then answer my question again. I read some stuff, SSE4 is an additional some instructions to SSE and like SSE2 makes computations on 128-bits registers MMX (4 integers 32-bit) AVX - 256-bit registers YMM0 -YMM15 (8 x 32-bits or 4 x 64-bits or even lower) , some on registers MMX, math operations in form c = a + b (in sse a=a+b) AVX2 - more instructions in 256-bit registers > And you really ought to be reading assembly output to get a feeling of > this stuff. I will spend some time on it today and tomorrow
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