Addition

Objectives

1. Investigate addition instructions.

Notes

• This is Jorgensen chapter 7.5
• The add instruction is add dest, src
  • This performs the action dest = dest + src
  • The operands must be the same size.
  • The destination can not be an immediate
  • Both source and destination can not be memory, one or the other
  • An immediate can not be 64 bits.
  • And remember, you need a q modifier in printf, (%qd, %qx)
• There is an increment instruction as well
  • This is inc dest
  • This adds one to the destination
  • The destination can not be an immediate.
• sub, dec
  • Just like add, inc
  • But be careful, you might not get the sign extended as you need.
• See adder.asm
• "It is the programmer's responsibility to ensure that the data types and sizes are appropriate for the operations being performed.", Jorgensen P 88.