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   comp.arch      Apparently more than just beeps & boops      131,241 messages   

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   Message 130,491 of 131,241   
   Thomas Koenig to John Levine   
   Re: instruction ordering, was Memory ord   
   12 Dec 25 08:14:47   
   
   From: tkoenig@netcologne.de   
      
   John Levine  schrieb:   
   > According to Thomas Koenig  :   
   >>MitchAlsup  schrieb:   
   >>   
   >>> Heck, there are assemblers that rearrange code like this too much--   
   >>> until they can be taught not to.   
   >>   
   >>Any example?  This would definitely go against what I would consider   
   >>to be reasonable for an assembler.  gdb certainly does not do so.   
   >   
   > On machines with delayed branches I've seen assemblers that move   
   > instructions into the delay slot.  Can't think of any others off hand.   
      
   Thinking of it a bit more, the optimizing assemblers for drum memory   
   computers like the IBM 650 or the LGP-30 of Mel the Programmer   
   fame moved around instructions so the next one would be under the   
   head when the previous one was done executing.   
      
   Random-access memory made this redundant :-)   
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