hamming

.data
num: .byte 0xa2

.text
la x1, num # loads address
lb x2, 0(x1) # loads data

# block below performs xor(1, 3, 5, 7, 9, 11)
mv x3, x2
srli x4, x3, 1
srli x5, x3, 3
srli x6, x3, 4
srli x7, x3, 6
xor x3, x3, x4
xor x3, x3, x5
xor x3, x3, x6
xor x3, x3, x7
andi x10, x3, 1

# block below performs xor(2, 3, 6, 7, 10, 11)
mv x3, x2
srli x4, x3, 2
srli x5, x3, 3
srli x6, x3, 5
srli x7, x3, 6
xor x3, x3, x4
xor x3, x3, x5
xor x3, x3, x6
xor x3, x3, x7
andi x3, x3, 1
slli x3, x3, 1
or x10, x10, x3 # c1|c0

# block below performs xor(4, 5, 6, 7, 12)
mv x3, x2
srli x4, x3, 1
srli x5, x3, 2
srli x6, x3, 3
srli x7, x3, 7
xor x3, x5, x4
xor x3, x3, x6
xor x3, x3, x7
andi x3, x3, 1
slli x3, x3, 3
or x10, x10, x3 # c2_c1|c0

# block below performs xor(8, 9, 10, 11, 12)
mv x3, x2
srli x4, x3, 4
srli x5, x3, 5
srli x6, x3, 6
srli x7, x3, 7
xor x3, x5, x4
xor x3, x3, x6
xor x3, x3, x7
andi x3, x3, 1
slli x3, x3, 7
or x10, x10, x3 # c3___c2_|c1|c0

# block below inserts data bits in respective postitions
andi x4, x2, 1
slli x4, x4, 2
or x10, x10, x4 # c3___c2|d0|c1|c0
andi x4, x2, 0x0e
slli x4, x4, 3
or x10, x10, x4 # c3|d3|d2|d1|c2|d0|c1|c0
andi x4, x2, 0xf0
slli x4, x4, 4
or x10, x10, x4 # d7|d6|d5|d4|c3|d3|d2|d1|c2|d0|c1|c0
sw x10, 4(x1) #stores result