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Need help in testing XMM register bit

 
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nwangsg
How do I cheat?
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Joined: 19 Dec 2021
Posts: 1

PostPosted: Sun Dec 19, 2021 7:59 am    Post subject: Need help in testing XMM register bit Reply with quote

Guys please help, how do I test if this byte is 1 in XMM0?


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ParkourPenguin
I post too much
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Joined: 06 Jul 2014
Posts: 4275

PostPosted: Sun Dec 19, 2021 1:10 pm    Post subject: Reply with quote

Code:
code:
  movd eax,xmm0
  cmp al,1
  je @f
  // first byte is not one
  jmp exit
@@:
  // first byte is one
exit:
  jmp return

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I don't know where I'm going, but I'll figure it out when I get there.
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Csimbi
I post too much
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Joined: 14 Jul 2007
Posts: 3102

PostPosted: Sun Dec 19, 2021 1:29 pm    Post subject: Reply with quote

This is what Ray said on this subject some 7 years ago.
Look for PTEST in the article (or, the Intel manual).
It would have been the number one result on Google - but you did not search, did you?
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