Question

1. Consider the fragment of MIPS assembly below: sw $s5, 12($s3) lw $s5, 8($s3) sub $s4, $s2, $s1 beqz $s4, label add $s2, $s0, $s1 sub $s2, $s6, $s1 Suppose we modify the pipeline so that it has only one memory (that handles both instructions and data). In this case, there will be a structural hazard every time a program needs to fetch an instruction during the same cycle in which another instruction accesses data. a. (10%) Draw a pipeline diagram to show where the code above will stall. Ans> Use the symbol "**" to represent a stall. First 12 Cycles Instruction Sequence 1 2 3 4 5 6 7 8 9 10 11 12 sw $s5, 12($s3) IF ID EX MEM WB lw $s5, 8($s3) sub $s4, $s2, $s1 beqz $s4, label add $s2, $s0, $s1 sub $s2, $s6, $s1

          1. Consider the fragment of MIPS assembly below:

sw	$s5, 12($s3)
lw	$s5, 8($s3)
sub	$s4, $s2, $s1
beqz	$s4, label
add	$s2, $s0, $s1
sub	$s2, $s6, $s1

Suppose we modify the pipeline so that it has only one memory (that handles both instructions and data). In this case, there will be a structural hazard every time a program needs to fetch an instruction during the same cycle in which another instruction accesses data.

a. (10%) Draw a pipeline diagram to show where the code above will stall.
Ans>

Use the symbol "**" to represent a stall.

First 12 Cycles
Instruction Sequence	1	2	3	4	5	6	7	8	9	10	11	12
sw $s5, 12($s3)	IF	ID	EX	MEM	WB
lw $s5, 8($s3)
sub $s4, $s2, $s1
beqz $s4, label
add $s2, $s0, $s1
sub $s2, $s6, $s1

1. Consider the fragment of MIPS assembly below:

sw s5, 12(s3)
lw s5, 8(s3)
sub s4,s2, s1
beqzs4, label
add s2,s0, s1
subs2, s6,s1

Suppose we modify the pipeline so that it has only one memory (that handles both instructions and data). In this case, there will be a structural hazard every time a program needs to fetch an instruction during the same cycle in which another instruction accesses data.

a. (10%) Draw a pipeline diagram to show where the code above will stall.
Ans>

Use the symbol "**" to represent a stall.

First 12 Cycles
Instruction Sequence 1 2 3 4 5 6 7 8 9 10 11 12
sw s5, 12(s3) IF ID EX MEM WB
lw s5, 8(s3)
sub s4,s2, s1
beqzs4, label
add s2,s0, s1
subs2, s6,s1

Added by Brenda R.

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