Homework Answers
Unaligned memory accesses occur when code try to read N bytes of
data starting from an address that is not evenly divisible by N
.
number = 0x1001000
$t0 = 0x1001000
word size = 4 bytes
halfword size = 2 bytes
byte size = 1
lw $t1, 1($t0)
Address = 0x1001000 + 1 = 0x1001001 and it is not evenly divisible
by 4.
This is unaligned.
lh $t2, 2($t0)
Address = 0x1001000 + 2 = 0x1001002 and it is evenly divisible by
2.
This is not unaligned.
lh $t3, 3($t0)
Address = 0x1001000 + 3 = 0x1001002 and it is not evenly divisible
by 2.
This is unaligned.
lb $t4, 3($t0)
Address = 0x1001000 + 3 = 0x1001003 and it is evenly divisible by
1.
This is not unaligned.
lb $t5, 1($t0)
Address = 0x1001000 + 1 = 0x1001001 and it is evenly divisible by
1.
This is not unaligned.
Therefore
lw $t1, 1($t0)
lh $t3, 3($t0)
are unaligned
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