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Message-Id: <A7F71A78-A12A-4B5A-A87A-4F6EC8939C97@gmail.com>
Date: Fri, 10 Jul 2015 17:47:37 +0800
From: Lei Zhang <zhanglei.april@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: extend SIMD intrinsics
> On Jul 7, 2015, at 9:16 PM, Solar Designer <solar@...nwall.com> wrote:
>
> On Mon, Jul 06, 2015 at 11:15:41PM -0400, Alain Espinosa wrote:
>> In Visual C the difference of a simple assignment and a vload is that for the assignment the compiler generate an unaligned SIMD load instruction, and for vload it generates an aligned SIMD load with the usual restriction: if this memory access isn't aligned the required byte amount an exception is raised. In general the performance difference is negligible, if any.
>
> When I corrected my code (bitslice DES code in JtR) to
> make the alignment apparent to gcc, it stopped generating the unaligned
> load instructions, generating the aligned ones instead.
Could you exemplify how you did it with some code?
Lei
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