cpu64bit/matrixMult.ys at main · arjunkalee/cpu64bit · GitHub

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# Assumptions:
# Matrix1 elements will be stored in %r8, %r9, %r10
# Matrix2 elements will be stored in %r11, %r12, %r13
# Result elements will be stored in %r14
# Size is stored in %rsi
# Index i in %rcx, j in %rdx, k in %rbx

# Manual Initialization of array and size
irmovq $1, %r8            # Matrix1[0][0] = 1
irmovq $2, %r9            # Matrix1[0][1] = 2
irmovq $3, %r10           # Matrix1[0][2] = 3
irmovq $4, %r11           # Matrix1[1][0] = 4
irmovq $5, %r12           # Matrix1[1][1] = 5
irmovq $6, %r13           # Matrix1[1][2] = 6
irmovq $7, %r14           # Matrix1[2][0] = 7
irmovq $8, %rbx           # Matrix1[2][1] = 8
irmovq $9, %rcx           # Matrix1[2][2] = 9

irmovq $9, %r11           # Matrix2[0][0] = 9
irmovq $8, %r12           # Matrix2[0][1] = 8
irmovq $7, %r13           # Matrix2[0][2] = 7
irmovq $6, %r14           # Matrix2[1][0] = 6
irmovq $5, %rbx           # Matrix2[1][1] = 5
irmovq $4, %rcx           # Matrix2[1][2] = 4
irmovq $3, %rdx           # Matrix2[2][0] = 3
irmovq $2, %rsi           # Matrix2[2][1] = 2
irmovq $1, %r8            # Matrix2[2][2] = 1

irmovq $3, %rsi           # Size of matrix = 3
irmovq $0, %rcx           # Initialize index i = 0

# Start of loop
.loop_start:
    irmovq $0, %rax
    irmovq $0, %rdx

    # Initialize sum = 0
    irmovq $0, %r14

    # Initialize index k = 0
    irmovq $0, %rbx

    # Calculate address of Matrix1[i][k]
    irmovq $0, %rax
    addq %rcx, %rax # i * 3
    addq %rax, %rbx # i * 3 + k

    mrmovq (%r8, %rbx, 8), %rax # Load Matrix1[i][k] into %rax

    # Calculate address of Matrix2[k][j]
    irmovq $0, %rax
    addq %rdx, %rax # j * 3
    addq %rax, %rdx # k * 3 + j

    mrmovq (%r11, %rdx, 8), %rdi # Load Matrix2[k][j] into %rdi

    # Multiply matrix1[i][k] and matrix2[k][j]
    addq %rdi, %rax

    # Add product to sum
    addq %rax, %r14

    # Increment k
    irmovq $1, %rax
    addq %rax, %rbx

    # Increment j
    irmovq $1, %rax
    addq %rax, %rdx

    # Check if j < 3
    irmovq $3, %rsi
    irmovq $0, %rax
    subq %rdx, %rsi
    jle .loop_start

# Exit program
halt