Question

The first instruction was given as an example, but im still not sure what im trying to find or how to get any of it.

Can someone step-by-step tell me what I’m looking for? (not so much the answers but how to find them)

MAR. 1 Example instruction Comments WNL JUMP TO (Ox FORNAT Range of addres 18 mp&jal 2500 FORn Range of address: Hex link Hex: Branch ecq Range of address: Hex: Branch ne Range of address: Hex Add immediate Range of constant: Hex: addiu Hex: Range of constant: Set less than imm Hex: Set less than immm unsigned Hex: Hex: Hex: Load word Hex Range of memory Add.s FP single

Answer 1

2.jump and link: this basically copy return address (value @ program counter) to $ra(return address register).

Syntax:- jal sub_label;

Ex:jal B747;

Op	address
3	(address of labelB747)/4
000011	00000000011110100001001000

Range of address basically jump instruction specifies an address within the current 256mbyte region specified by PCs most significant 4 bits.

3.branch eq:- it is a conditional branch

Ex: beq src1,src2,label

Conditionally branch to the instruction at the label if the content of register src1 equal to src2.

beq v0,zero,0x9d0000b4;

If src1=src2 then PC<-PC+(address of label-pc)

PC<-PC+offset*4

4.branch ne: branch not equal

bne reg1,reg2,label;

If reg1!=reg2 then PC<-PC+offset*4

5.addiu: it is an unsigned addition. The only difference between signed and unsigned addition is that signed addition can raise an overflow exception ,so addiu is used instead to avoid that.

Ex: addiu a0,a0,0x8020 is a0=a0+0xffff8020