## INSERIRE: COGNOME - NOME - NUMERO POSTAZIONE - PROFESSORE
## ADT  PARI 
## RINOMINARE IL FILE COME "risultato.s"
#############################################
#     DATA SEGMENT                          #
#############################################
    .data
mat:  .word  11, 12, 13, 14
      .word  21, 22, 23, 24
      .word  31, 32, 33, 34
         
N_rig: .word 3 # numero righe
M_col: .word 4 # numero colonne 
endl:  .asciiz "\n\n"  
tab:   .asciiz "\t" 

###########################################################
## add_rig
## somma gli elementi della riga i-esima della matrice
## $a0 : input - base address della matrice 
## $a1 : input - M -> numero di colonne della matrice
## $a2 : input - i_riga -> numero (1..N) della riga da stampare 
###########################################################
    .text
add_rig:
    
    # calcola l'indirizzo base della riga i-esima
    sll  $t1, $a1, 2     #  M*4 
    addi $t2, $a2, -1    # (i-1) 
    mul  $t1, $t2, $t1   # (i-1)*M*4   
    add  $t0, $t1, $a0   # base + (i-1)*M*4 
    
    # inizializza il ciclo
    move $t2, $a1 # M - colonne   
    move $t6, $zero # j = 0
    move $v0, $zero
    
add_rig_loop_j:
    bge $t6, $t2, add_rig_end_loop_j  # j < M
    lw  $a0, ($t0)
    add $v0, $v0, $a0
    addi  $t0, $t0, 4     # &mat[i,j]
    addi  $t6, $t6, 1     # j++
    j add_rig_loop_j   
add_rig_end_loop_j:
    
    jr   $ra 
# end add_rig

#############################################
#     TEXT SEGMENT                          #
#############################################
    .text
    .globl main
main:  
    la   $a0, mat
    lw   $a1, M_col
    li   $a2, 3
    jal  add_rig
       
    move $a0, $v0
    li $v0,1     
    syscall

    li $v0,10
    syscall     # exit
    
## end of file ##