ELEC50010-IAC-CW/reference/ibrahimreference.txt

===== ADDIU ==========
int main(void) {
    int a = -2147483648 + -32768 ;
}

ORI $4,$0,-2147483648
ADDIU $2,$4,-32768
JR $0

//used to check for overflow 32768 is 2^15 which should 
be sign extended. 21... is 2^31 


register_v0 = 

==========XORI	Bitwise exclusive or immediate=============

int main(void) {
    int a = 5 ^ 2;
}

ori $4,$0,5
xori $2,$4,2
jr $0

register 0 = 7

34040005
38820002
00000008

convert to little endian

////////

====XOR	Bitwise exclusive or==========

int main(void) {
    int a = 5 ^ 2;
}

ori $4, $0, 5
ori $5, $0, 2
xor $2, $4, $5
jr $0

register 0 = 7

34040005
34050002
00851026
00000008

convert to little endian

////////

========SW	Store word==============

int main(void) {


ori $4, $0, 5 
ori $5, $0, 1
sw $4, 1($5)
jr $0

register 0 = 5

34040005
34050001
aca40001
00000008


=========== SUBU	Subtract unsigned ===========

int main(void) {
    int a = 5-3;
}

ori $4,$0,5
ori $5,$0,3
subu $2,$4,$5
jr $0


register_v0 = 2


34040005
34050003
00851023
00000008


========= SRLV	Shift right logical variable ======


int main(void) {
    int a = 2;
    int b = 16>>a;
}

ori $4,$0,2
ori $5,$0,16
srlv $2,$5,$4
jr $0

register 0 = 3

34040002
34050010
//////
//////

===============  SRL	Shift right logical  ==============


int main(void) {
    int a = -2147483647>>2; #logical shift - should feed in 0s
}

ori $4,$0,-2147483647
srl $2,$4,$2
jr $0

register 0 = 536870912 (2^29)

34040001
00041002
00000008

========== SRAV	Shift right arithmetic variable =======

int main(void) {
    int a = 2;
    int b = -2147483647>>2; #arithemtic shift not logical - feed in 1s (sign extension)
}

ori $4, $0, 4
ori $5,$0,0xF000
srav $2,$5,$4
SRAv $v0 $a1 $a0
jr $0

register 0 = -536870912 (first 3 bits high - rest low)

34040004
3405F000

////////
///////

====== SRA	Shift right arithmetic ==========

int main(void) {
    int a = -2147483647>>2; #arithemtic shift not logical - feed in 1s (sign extension)
}


ori $4,$0,-2147483647
sra $2,$4,$2
jr $0

register 0 = -536870912 (first 3 bits high - rest low)

34040001
00041003
00000008

======= SLTU	Set on less than unsigned =====

int main() {
    int a = 10;
    int b = 9;

    max = a < b ? 1 : 0;

    return max;
}


ori $4, $0, 10
ori $5, $0, 9
sltu $2, $4, $5
jr $0

register 0 = 0

3404000a
34050009
0085102b
00000008

=========== SLTIU	Set on less than immediate unsigned ==================

int main() {
    int a = 10;

    max = a < 9 ? 1 : 0;

    return max;
}


ori $4, $0, 10
sltiu $2, $4, 9
jr $0

register 0 = 0

3404000a
2c820009
00000008

======= SLTI	Set on less than immediate (signed) ========

int main() {
    int a = 10;

    max = a < 9 ? 1 : 0;

    return max;
}


ori $4, $0, 10
slti $2, $4, 9
jr $0

register 0 = 0

3404000a
28820009
00000008



======= SLLV	Shift left logical variable ======


int main(void) {
    int a = 2;
    int b = 3<<a;
}

ori $4,$0,2
ori $5,$0,3
sllv $2,$5,$4
jr $0

register 0 = 16

34040002
34050003
//////
//////


======= SLL	Shift left logical  ======


int main(void) {
    int a = 3<<2;
}

ori $4,$0,3
sll $2,$4,2
jr $0

register 0 = 16

34040003
00041080
00000008

======== SB	Store byte =======

ori $4, $0, 1029
ori $5, $0, 1
sb $4, 1($5)
jr $0

register 0 = 5

34040405
34050001
a0a40001
00000008

 ======== ORI	Bitwise or immediate ===

ori $4,$0,3
jr $0

register a0 = 3

34040003
00000008

======== OR	Bitwise or  ===

int main(){
    int a =5;
    int b= 3;

    int c = 5 | 3;

    return 0;
}


ori $4, $0, 5
ori $5, $0, 3
or $2, $4, $5
jr $0


34040005
34050003
00851025
00000008

register 0 = 7

======= MULT	Multiply =====

ori $4, $0, 4
ori $5, $0, 3
mult $4, $5
jr $0

$LO = 12

34040004
34050003
00850018
00000008


======= MULT Multiply =====

ori $4, $0, 4
ori $5, $0, 3
mult $4, $5
mflo $2
jr $0

register v0 = 12

34040004
34050003
00850018
00001012
00000008

======= MULTU	Multiply unsigned =====

ori $4, $0, 4
ori $5, $0, 3
multu $4, $5
jr $0


$LO = 12

34040004
34050003
00850019
00000008


======= MULTU	Multiply unsigned =====

ori $4, $0, 4
ori $5, $0, 3
multu $4, $5
mflo $2
jr $0


$2 = 12

34040004
34050003
00850019
00001012
00000008

======= MFLO Move from lo ======

ori $4, $0, 4
ori $5, $0, 3
multu $4, $5
mflo $2
jr $0


$2 = 12

34040004
34050003
00850019
00001012
00000008

=========== MFHI Move from Hi ==========

ori $4, $0, 3
mthi $4
mfhi $2
jr $0

register v0 = 3

34040003
00800011
00001010
00000008

======== MTHI	Move to HI ====

ori $4, $0, 5
mthi $4
jr $0


$HI = 5

34040005
00800011
00000008

======= MTLO	Move to LO ===

ori $4, $0, 5
mtlo $4
jr $0


$HI = 5

34040005
00800013
00000008

==================== SH	Store half-word =======

/////////


======== DIV Divide  ======


ori $4, $0, 4
ori $5, $0, 3
div $4, $5
jr $0


$LO = 1
$HI = 1

34040004
34050003
0085001A
00000008

========= DIVU Divide unsigned =====

ori $4, $0, 4
ori $5, $0, 3
divu $4, $5
jr $0

$LO = 1
$HI = 1

34040004
34050003
0085001B
00000008