Modify fib.s

Use Conditional suffixes:
CMP r4, embedded2014#1
BLT( r4<1 , r4<=0 )
BEQ( r4=1 )

Author: stanleyleee

lab-1/fib.s

@@ -14,19 +14,29 @@ fibonacci:
 	push {r3, r4, r5, lr}
 
 	@ R4 = R0 - 0 (update flags)
+	mov r4, r0
 	@ if(R0 <= 0) goto .L3 (which returns 0)
+	cmp r4, #1
+	blt .L3
 
 	@ Compare R4 wtih 1
 	@ If R4 == 1 goto .L4 (which returns 1)
+	beq .L4
 
 	@ R0 = R4 - 1
+	sub r0, r4, #1
 	@ Recursive call to fibonacci with R4 - 1 as parameter
+	bl fibonacci
 
 	@ R5 = R0
+	mov r5, r0
 	@ R0 = R4 - 2
+	sub r0, r4, #2
 	@ Recursive call to fibonacci with R4 - 2 as parameter
+	bl fibonacci
 
 	@ R0 = R5 + R0 (update flags)
+	add r0, r5, r0
 
 	pop {r3, r4, r5, pc}		@EPILOG