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Date: Sun, 20 May 2012 16:07:36 -0300
From: Claudio André <>
Subject: Re: OpenCL SWAP64 on 7970

Em 05-05-2012 22:55, myrice escreveu:
> 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.
> Thanks
> myrice

Sorry for the late answer, in 7970 you can't use the regular bitwise 
operations on SWAP64. Another crazy bug??
You got good answers already about vector usage (#define SWAP64(n)       

For NVIDIA and CPU keep your bitwise SWAP64 version (for better 


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