For the MIPS Datapath Shown Below, Several Lines Are Marked$\bullet$

Question

Examlex · Accepted Answer

The Answer is (1) Cannot write to register file. This means that R-type and any instruction with write back to register file will fail. An example of code snippet that would fail is:
add $s1, $s2, $s3
An example of a code snippet that will not fail is:
sw $s1, 0($s2)
(2) Forwarding of the first operand fails. An example of code snippet that would fail is:
add $s1, $t0, $t1 add $s1, $s1, $s1
An example of code snippet that will not fail is:
add $s1, $t0, $t1
add $s1, $t2, $s1 # Here the second operand is forwarded correctly
(3) Jumping to a branch target does not work. Example of code that fails:
addi $s1, $zero, 2 addi $s2, $zero, 2 beq $s1, $s2, exit
Code that will still work:
addi $s1, $zero, 10 addi $s2, $zero, 20 beq $s1, $s2, exit

For the MIPS Datapath Shown Below, Several Lines Are Marked $\bullet$

Definitions:

For the MIPS Datapath Shown Below, Several Lines Are Marked ∙\bullet∙

Definitions:

For the MIPS Datapath Shown Below, Several Lines Are Marked $\bullet$