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// addq %rdx, %rdi Aptr = xa + 64i
// fix_matrix = int[16][16], so each int is 4 bytes and we need to multiple by the number of columns to find the
// i row, A + L(C*i + j) <=> A + 4(16*i)
//
// leaq (%rsi, %rcx, 4), %rcx Bptr = xb + 4k, this one is simple B + L(C*i + j) <=> B + 4(j), find the first row of the column j
//
// leaq 1024(%rcx), %rsi Bend = xb + 4k + 1024, find the N row of column k,
// B + 4(16*16 + k) <=> B + 1024 + 4k
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