Date: Sun, 06 May 2012 13:26:01 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: OpenCL SWAP64 on 7970 On 05/06/2012 03:55 AM, myrice wrote: > Claudio, all > > It seems that 7970 has some strange behaviors when we perform bitwise > operation with ulong type. SWAP64 didn't work correctly. > xsha512-opencl and cryptsha512-opencl are all influenced. Here is what > I get from my debugging. > > With a 64bit variable n, if we do (n) << 56, no problem. However, if > we do (n) & 0xff00 << 24 or << 32 or << 40, the result will be 0. It > seems that the & operation converts the result to a 32bit variable. So > the << 24 or above will make the result to be 0. Have you tried using 0xff00UL instead? I had to use 0xffU for some of my 32-bit macros, otherwise it would become signed. magnum
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