[mips] : Wo ist der Wurm?

### Programmsegment: Matrix-Vektor-Multiplikation ###

# Verwendung der Register:
#
#   $s0: n
#   $s1: counter_i
#   $s2: counter_k
#   $s5: index_A
#   $s6: index_x
#   $s7: index_b
#   $f0: A[index_A] (= A[i][k])
#   $f2: x[index_x] (= x[k])
#   $f4: sum

	.text

	.globl main

main:	lw $s0, dim		# n = Matrixdimension

	move $s1,$s0         		# counter_i = n
	move $s5,$0        		# index_A   = 0
	move $s7,$0        		# index_b   = 0

loopi:	blez $s1, endi          # while (counter_i > 0)

	move $s2,$s0          		# counter_k = n
	mtc1 $zero, $f4		# sum = 0.0
	mtc1 $zero, $f5
	move $s6, $0         		# index_x = 0

loopk:	blez $s2, endk		# while (counter_k > 0)

	l.d  $f0, mat_A($s5)        	# lade $f0 mit A[index_A]
	l.d $f2, vec_x($s6)          	# lade $f2 mit x[index_x]

	add.d  $f4,$f4,$f4       			# sum +=
	mul.d $f4,$f0,$f2		       # A[index_A] * x[index_x]

	add $s5,$s5,1            	# index_A++
	add $s6,$s6,1             	# index_x++
	sub $s2,$s2,1             	# counter_k--

	j loopk

endk:	l.d $f4, vec_b($s7)                	# speichere sum in b[index_b]

	li $v0,2                 	# printf("%f", sum)
	move $a0,$s7
	syscall

	li $v0,4                     # printf("\n")
	la  $a0, hans
	syscall

	add $s7,$s7,1             	# index_b++
	sub $s1,$s1,1            		# counter_i--

	j loopi

endi:	li $v0, 10		# beende Programm
	syscall

### Datensegment ###

	.data

dim:	.word 5

mat_A:	.double 2.0, 1.0, 4.0, 2.0, 6.0
	.double 1.0, 2.0, 2.0, 4.0, 2.0
	.double 4.0, 2.0, 6.0, 1.0, 3.0
	.double 4.0, 2.0, 6.0, 2.0, 1.0
	.double 4.0, 3.0, 2.0, 2.0, 3.0

vec_x:	.double 1.0, 3.0, 5.0, 1.0, 3.0

vec_b:	.double 0.0, 0.0, 0.0, 0.0, 0.0

hans:	.asciiz "\n"