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Message-ID: <20150712165218.GA4222@openwall.com>
Date: Sun, 12 Jul 2015 19:52:18 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: extend SIMD intrinsics
Alain,
On Sun, Jul 12, 2015 at 12:27:40PM -0400, Alain Espinosa wrote:
> I use __m128i pointers and static stack allocated __m128i arrays. Both generate unaligned loads. For example this generate an unaligned load and the compiler had all information to use aligned:
>
> void sample_func()
> {
> __m128i test_array[16];
>
> ...
> __m128i test_var = test_array[6];
> ...
> }
Right. However, what if you move test_array to global scope, or declare
it "static" in the function? I am wondering if the compiler possibly
doesn't want to rely on the stack being 16-byte aligned (as it normally
is per x86_64 ABI).
Alexander
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