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Assembly Programming

The following are some additional pseudo-instructions that one could define for MIPS. In each case, supply an equivalent MIPS instruction or sequence of instructions with the desired effec

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Question 1

The following are some additional pseudo-instructions that one could define for MIPS. In each case, supply an equivalent MIPS instruction or sequence of instructions with the desired effect. Recall that pseudo-instructions should change no registers except the destination register (if applicable, or PC for branch/jump), but pseudo-instructions may make use of $at for temporary results. Briefly describe the utility or usefulness of each pseudo-instruction. 

parta: xchg    $rt, o[$rs]     # swap the memory in M[$rs+o] with $rt
partb: slld    $rs,$rt, shamt  # Shift the double word rs:rt left by shamt 
partc: double  $rd, $rs        # $rd = 2x($rs)  
partd: triple  $rd, $rs        # $rd = 3x($rs)  
parte: mulacc  $rd, $rs, $rt   # $rd = ($rd)+($rs)x($rt)

NOTES:

  • You are not required to implement and test your code. Implementing and testing your code with an appropriate documented testing framework is worth bonus marks. 
  • in part, you are to load $rt from the effective address, and store $rt in the effective address, swapping the contents of the register and memory
  • in part, treat rs and rt together as one 64-bit register, and shift it left by  the shift amount shamt, storing the result bad in rs:rt
  • In part, mulacc is short for multiply-accumulate. You can assume that the result of (reg1) x (reg2) will fit in a single register. 
  • If you can't do a pseudo instruction with a single extra register $at, you may push the contents of a different register before the pseudo instruction, use that register, and then pop its value afterwards.

Bonus: invent a new useful pseudo instruction and write the code for it.  Explain why it is useful. 

 

Question 2

Using the min-max code from the lab as a starting point, write and implement a MIPS program which performs a sort of an array, with the following considerations:

  • The array is to be sorted by insertion sort, not selection sort. For details of the algorithm, see http://en.wikipedia.org/wiki/Insertion_sort;
  • The array is to be sorted by absolute value (e.g. 1, -2, 3, -4, 5, -6...) but the values of the array elements themselves should not be changed; and
  • Use at least one subroutine which makes use of a stack frame, including frame offsets for argument or return value access.

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