Data commit

Task/String-matching/MIPS-Assembly/string-matching-1.mips

@@ -0,0 +1,37 @@
+InString:
+	;input: $a0 = ptr to string 1
+	;		$a1 = ptr to string 2
+	;	assumes len($a1) <= len($a0)
+	;out: $v0 = zero-based index where the second string is placed in the first.
+	
+	;clobbers: $t0,$t1
+	subiu sp,sp,4		;set up a stack frame of 4 bytes.
+	sw $a1,(sp)
+	li $v0,0
+InString_again:
+	lbu $t0,($a0)
+	nop
+	beqz $t0,InString_terminated
+	nop
+	
+	lbu $t1,($a1)
+	nop
+	beqz $t1,InString_terminated
+	nop
+	
+	bne $t0,$t1,InString_noMatch
+	nop
+		b InString_overhead
+		addiu $a1,1
+		
+InString_noMatch:
+	lw $a1,(sp)		;reset the substring pointer if the letters don't match
+	addiu $v0,1		;load delay slot
+InString_overhead:
+	addiu $a0,1
+	b InString_Again
+	nop
+InString_terminated:
+	addiu sp,sp,4
+	jr ra
+	nop

Task/String-matching/MIPS-Assembly/string-matching-2.mips

@@ -0,0 +1,41 @@
+main:
+	la $a0,MyString
+	la $a1,Test1      ;this code was recompiled 5 times, testing a different string each time.
+	jal InString
+	nop
+	
+	jal Monitor
+	nop
+	
+	
+shutdown:
+	nop  ;Project 64 will detect an infinite loop and close the ROM if I don't have this nop here.
+	b shutdown
+	nop
+
+
+MyString:    ;this was loaded into $a0
+	.ascii "abcdefghijklmnopqrstuvwxyz"
+	.byte 0
+	.align 4
+;each of these was loaded into $a1 individually for testing
+Test1:
+	.ascii "abc"  ;InString returned 0
+	.byte 0
+	.align 4
+Test2:
+	.ascii "xyz"  ;InString returned 0x17 (decimal 23)
+	.byte 0
+	.align 4
+Test3:
+	.ascii "def"  ;InString returned 3
+	.byte 0
+	.align 4
+Test4:
+	.ascii "z",0  ;InString returned 0x19 (decimal 25)
+	.byte 0
+	.align 4
+Test5:
+	.ascii "1",0 ;InString returned 0x1A (decimal 26)
+	.byte 0
+	.align 4