SPARC  (32 bit)

! Note that syntax is opcode, source, destination
! In example, arr represents an assembler label for a 32 bit memory address
!  which is start of an array of values.

start: sethi %hi(arr),%r2     ! Set high 22 bits of %r2 
                              !   to memory address labelled "arr"
       or    %r2,%lo(arr),%r1 ! OR with lower 10 bits of arr's address 
                              !   for full address
                              ! %r1 now holds full address of arr
                         !
                         ! Initialize %r3 and %4 to zero, $r0 = 0 always
       mov %r0,%r3       ! %r3 will be an index register
       mov %r0,%r4       ! Use %r4 to hold sum
       set 20,%r5        ! %r5 counter, set to specified immediate value.

loop:  ld [%r1+%r3],%r6  ! (indirect, indexed) fetch the next element 
                         !   and store it in register 6
       add %r4,%r6,%r4   ! add contents of sum and retrieved value and 
                         ! restore in sum
                         !   Implies that actual math done in an unnamed
                         !   accumulator register and explicitly moved back.
                         !
       subcc %r5,1,%r5   ! decrement counter register
       bne loop          ! if %r5 > 0 get next element 
       add %r3,4,%r3     ! increment the index (DELAY SLOT)
                         !   executed whether loop taken or not.