ELEC50010-IAC-CW/inputs/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, 2
ori $5,$0,-2147483647
srav $2,$5,$4
jr $0

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

34040002
34050001
////////
///////

====== 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