a)not $t1, $t2 //bit-wise invert b)orn $t1, $t2, $t3 // bit-wise OR of $t2, !$t3

Question

a)not $t1, $t2 //bit-wise invert
b)orn $t1, $t2, $t3 // bit-wise OR of $t2, !$t3

1) Logical instructions above are not included in MIPS instruction set but are described in comment, If $t2 = 0x00FFA5A5, $t3 = 0xFFFF003C, what is the result of $t1 in a) and b)?

2) what is the minimal set of MIPS instruction that can be used in place of instructions in a) and b)?

3) For sequecnce instruction in prob 2, show the bit level representation of each instruction.

if possible, step by step will be helpful

Explanation / Answer

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a)not $t1, $t2 //bit-wise invert
b)orn $t1, $t2, $t3 // bit-wise OR of $t2, !$t3

1) Logical instructions above are not included in MIPS instruction set but are described in comment, If $t2 = 0x00FFA5A5, $t3 = 0xFFFF003C, what is the result of $t1 in a) and b)?

a)assuming the instruction is $t1=!$t2

since $t2=00FFA5A5, if you reverse the bits, basically find the 1's complement get

0xFF005A5A

b) assuming the instruction is $t1=$t2 | $t3

      0x00FFA5A5 | !0xFFFF003C = 0x00FFA5C3

2) what is the minimal set of MIPS instruction that can be used in place of instructions in a) and b)?

not      with nor

nor $t1,$t2,$t2

orn can be

nor $t3,$t3,t3       !$t3

or   $t1,$t2,$t3     $t1=t2|t3

3) For sequecnce instruction in prob 2, show the bit level representation of each instruction.

not

nor $t1,$t2,$t2            op code    Rs     Rt    Rd                function code

                                000000   01001 01010 01010 00000 100111

orn   

nor $t3,$t3,t3             000000 01011 01011 01011 00000 100111

or   $t1,$t2,$t3           000000 01010 01011 01001 00000 100101

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