Date: Mon, 10 Dec 2012 03:52:01 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: bitslice DES on GPU On Sun, Dec 09, 2012 at 02:11:56PM +0530, Sayantan Datta wrote: > I checked the tahiti isa of two different hardcoded kernels and to my > surprise they just differ by a single line. > v_xor_b32 v68, v38, v68 // 00000A24: > 3A888926 > vs > v_xor_b32 v68, v21, v68 // 00000A24: > 3A888915 It is unreasonable to comment on compiled code differences without having seen your corresponding source code. Maybe it's such that your hard-coded constants got optimized out (in both cases) as not affecting the result. It is possible that there are some other left-over differences from the optimizer (such as in register numbers used). Alexander
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