Exercise 3 Complete

Labs/Lab05/searcharray.s

+# CSCI 206 Computer Organization & Programming
+
+# Date: 2011-09-13
+
+# Revised 2019-10-31 for RISC-V
+
+#
+
+# Copyright (c) 2011 Bucknell University
+
+#
+
+# Permission is hereby granted, free of charge, to any individual or
+
+# institution obtaining a copy of this software and associated
+
+# documentation files (the "Software"), to use, copy, modify, and
+
+# distribute without restriction, provided that this copyright and
+
+# permission notice is maintained, intact, in all copies and
+
+# supporting
+
+# documentation.
+
+#
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+
+# NONINFRINGEMENT. IN NO EVENT SHALL BUCKNELL UNIVERSITY BE LIABLE FOR ANY
+
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
+
+# THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#
+
+#
+
+# Student name: Kyle Chrysler
+
+#
+
+# data segment -------------------------------------
+
+	.data	 
+
+	.align 2
+
+ 
+
+save:
+
+	.word 0,0,0,0,7,0,0,0,0,0 	# array save[.]
+
+ivar:
+
+	.word 0 			# int i
+
+kvar:
+
+	.word 0 			# int k
+
+donestring:
+
+	.asciz "i= "
+
+prompt:
+        .asciz "Enter the value to search for: "
+      
+errorstring:
+        .asciz "value not found."
+
+# code segment --------------------------------------
+
+	.text
+
+init:
+	la a0, prompt
+	
+	li a7, 4
+	
+	ecall
+	
+	li      t4, 0
+	
+	li      t3, 10
+	
+	li 	s3, 0 		# store 0 in i
+
+	la	t1, ivar
+
+	sw 	s3, 0(t1)
+
+	li 	s5, 7 		# store 7 in k
+
+	la	t1, kvar
+
+	sw 	s5, 0(t1)
+
+        la 	s4, save 	# put the address of save[0] in $s4
+
+        addi 	t0, zero, 7 	# t0=7 
+        li a7, 5
+        
+        ecall
+        
+        mv t0, a0
+
+        
+
+test:
+
+	# reserve t1 for byte offset of save array
+		
+
+	add	t1, zero, s3 	# t1 = i
+
+	slli	t1, t1, 2 	# cnvert index to byte addres (multiply t1 by 4)
+
+	add	t1, t1, s4	# t1 = &save[0] + t1 (byte address of save[i])
+
+	lw	t2, 0(t1)	# t2 = save[i]
+	
+	addi    t4, t4, 1
+	
+	beq     t4, t3, error
+
+	beq	t2, t0, terminate
+
+	addi	s3, s3, 1
+	
+	j test
+	
+	
+terminate:
+
+	la	a0, donestring
+
+	li	a7, 4
+
+	ecall
+
+	
+
+	add	a0, zero, s3		# print value of i
+
+	li	a7, 1
+
+	ecall
+
+	    
+
+	li 	a7, 10 		# terminate program
+
+	ecall	
+
+error:
+	la a0, errorstring
+	
+	li a7, 4
+	
+	ecall
+	
+	li      a7, 10
+	ecall
+