.globl sumarray
sumarray: mv a2, a0      # compensate for abi design blunder: first argument (array base address) in return value register
          slli a1, a1, 2 # convert array size to byte count
          li a0, 0       # initialize return value to 0
          add a1, a1, a2 # compute array end
          beq a1, a2, 1f # skip loop if empty
    2:    lw a3, (a2)    # load array item from memory
          add a0, a0, a3 # add to total
          addi a2, a2, 4 # increment array pointer
          bne a1, a2, 2b # continue loop unless done
    1:    ret