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   comp.lang.asm.x86      Ahh, the lost art of x86 assembly      4,675 messages   

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   Message 3,543 of 4,675   
   Bernhard Schornak to Robert Prins   
   Re: Converting MMX to XMM [was: XSAVE ar   
   17 Sep 18 22:53:40   
   
   From: schornak@nospicedham.web.de   
      
   Robert Prins wrote:   
      
      
   > Tried x65dbg, and tracing into Windows is OK, XMM's are ok, until I hit a:   
   >   
   > 74AF2320 | EA 1E27AF74 3300         | jmp far 33:74AF271E        
                  |   
   >   
   > which doesn't want to be traced, and which comes back with XMM0, yes, set to   
   zero.   
      
      
   If your far jump calls a HLL function, XMM0 is a 'volatile'   
   register. If you need its content after that function call,   
   you have to preserve it prior to the call and restore it on   
   re-entry (or use XMM6 ... XMM15).   
      
      
   Greetings from Augsburg   
      
   Bernhard Schornak   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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