#This program contains some very basic instructions
#to demonstrate the fundamentals fo assembly language programming.
#author: Hornick
#CS2710 - 12/12/12

.text	#.text directive (default) just tells the assembler where to put the instructions in memory

main:	#this label is assigned the value of the address of the next instruction

	#examples of numeric formats
	addi 	$t0, $zero, 100	# load t0=100 via a base-10 value
	addi 	$t1, $zero, 0144# 0144 is base-8 (octal) = 100 base-10
	addi 	$t2, $zero, 0x64# 0x64 is base-16 (hexadecimal) = 100 base-10
	
	#examples of instructions
	andi 	$t0, $zero, 1	# increment t0 (equivalent to t0++); 
	sll 	$t1, $t0, 1	# t0 = t1<<1; this effectively muliplies by 2
	addu 	$t0, $s1, $s2	# t0 = s1 + s2; treat as unsigned
	add 	$t1, $s1, $s2	# t1 = s1 + s2; treat as signed
	lw 	$t1, x		# t1 = value of memory at location x
	
.data 0x10010020	#.data directive tells the assembler where to put data in memory			
x:			#this label=address in memory of the MSB of the following word
.word 0x12345678
y:			#this label=address in memory of the first of the following bytes
.byte 1,2,3,4,5,6,7,8   #Caution: observe how the assembler places these in memory!