N       =,              3
    M       =,              4
.data
matriceA:
.word 0xAB317811, 0xCD514229, 0xEF832040, 0xA1346269
.word 0xB2178309, 0xC3524578, 0x65702887, 0x59227465
.word 0x14930352, 0x24157817, 0x39088169, 0x63245986
matriceB:
.word 0x39916800, 0x47900160, 0x62270208, 0x87178291
.word 0xA7674368, 0xB2092278, 0xC3556874, 0xD6402373
.word 0xE1216451, 0x24329020, 0x51090942, 0x11240007
matriceC:
.space N * M * 4

.text
.globl main
.ent main
main:
    subu    $sp,            $sp,        4
    sw      $ra,            ($sp)
    la      $a0,            matriceA
    la      $a1,            matriceB
    la      $a2,            matriceC
    li      $a3,            N
    li      $t0,            M
    subu    $sp,            $sp,        4
    sw      $t0,            ($sp)
    jal     MediaMatrice
    addiu   $sp,            $sp,        4
    lw      $ra,            ($sp)
    addiu   $sp,            $sp,        4
    jr      $ra
.end main

.ent MediaMatrice
MediaMatrice:

    mult $a3, $t0
    mflo $a3

    li      $t1,            0
loop_colonna:

    li      $t2,            0
loop_riga:

    addu    $t3,            $t1,        $t2
    sll     $t3,            $t3,        2
    addu   $t3,            $t3,        $a0
    lw      $t3,            ($t3)

    addu    $t4,            $t1,        $t2
    sll     $t4,            $t4,        2
    addu   $t4,            $t4,        $a1
    lw      $t4,            ($t4)

    slt     $t5,            $t3,        $0
    slt     $t6,            $t3,        $0
    xor     $t5,            $t5,        $t6

    bne     $t5,            $0,         opposto
    addu    $t4,            $t3,        $t4
    srl     $t4,            $t4,        1

    li $t5, 0x80000000
    and $t3, $t3, $t5
    or $t4, $t4, $t3

    j       salva_media
opposto:
    add     $t4,            $t3,        $t4
    sra     $t4,            $t4,        1

salva_media:
    addu    $t3,            $t1,        $t2
    sll     $t3,            $t3,        2
    addu   $t3,            $t3,        $a2
    sw      $t4,            ($t3)

    addiu   $t2,            $t2,        1
    bne     $t2,            $t0,        loop_riga

    addu   $t1,            $t1,        $t0
    bne     $t1,            $a3,        loop_colonna

    jr      $ra
.end MediaMatrice