Date: Sun, 6 Sep 2015 13:20:44 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: Large stack alignment On 2015-09-05 20:48, magnum wrote: > On 2015-09-05 04:47, Solar Designer wrote: >> Guess not confirmed. We use buffers on the stack, and they are properly >> aligned for 128-bit SIMD. This is unreliable for AVX2 and above, though. > > Are you sure it's unreliable? As far as I can google it, gcc had > problems with large alignments but it was fixed long before 4.7, which > is the minimum version you need to even build for AVX2. > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16660 > http://stackoverflow.com/questions/841433/gcc-attribute-alignedx-explanation So Lei reminded me of this: http://www.openwall.com/lists/john-dev/2015/08/24/8 We have an issue for changing all stack allocs using MEM_ALIGN_SIMD to align ourselves. magnum
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