Store/Retrieve WC,WZ ?

Comments

• Bergamot Posts: 185

  2007-11-05 15:53 edited 2007-11-05 15:53

  Cue desilva in 3, 2, 1...
• Mike Green Posts: 23,101

  2007-11-05 15:57 edited 2007-11-05 15:57

  You use conditional execution to do something or not do something that stores the value in a memory location. For example:

       if_c   or     saved,#1
       if_nc andn saved,#1
       if_z   or     saved,#2
       if_nz andn saved,#2
  

  
  
  or

               mov  saved,#0
       if_c   or     saved,#1
       if_z   or     saved,#2
  
• rokicki Posts: 1,000

  2007-11-05 17:43 edited 2007-11-05 17:43

  To make restoration easier, you may want to set the bits so you can restore them in a single operation.
  Something like this might work:
  
  

          mov saved,#0
  if_c   or saved,hibit
  if_nz or saved,#1
  
  

  
  
  
  Then to restore you just need to
  
  

         add saved,saved wc,wz
  
  

  
  
  
  for a destructive save, or
  
  <pre>
  mov acc,saved
  add acc,saved wc,wz
  </pre>
  
  for a nondestructive save.
• hippy Posts: 1,981

  2007-11-05 18:01 edited 2007-11-05 18:01

  I haven't tested it but aren't the MUX opcodes useful here ...
  
  

  ' To save both flags ...
  
  MUXNZ flags,#2
  MUXC  flags,#1
  
  ' To reload both flags ...
  
  SHR flags,#1 WC, WZ, NR
  
  
  
• Mike Green Posts: 23,101

  2007-11-05 18:15 edited 2007-11-05 18:15

  Thanks, hippy. That's even cleaner and shorter.