1 files changed, 18 insertions, 0 deletions
diff --git a/3/8_array_allocation_and_access/38_nested_arrays.c b/3/8_array_allocation_and_access/38_nested_arrays.c
new file mode 100644
index 0000000..b53c7be
--- /dev/null
+++ b/3/8_array_allocation_and_access/38_nested_arrays.c
@@ -0,0 +1,18 @@
+#define M 20;
+#define N 30;
+
+long P[5][7];
+long Q[7][5];
+
+// i in rdi, j in rsi
+// sum_element:
+//      leaq    0(,%rdi, 8), %rdx       %rdx <- 8*i
+//      subq    %rdi, %rdx              %rdx <- %rdx - i
+//      addq    %rsi, %rdx              %rdx <- %rdx + j
+//      leaq    (%rsi, %rsi, 4), %rax   %rax <- 5j
+//      addq    %rax, %rdi              %rdi <- %rax + %rdi // rdi <- 5j + i
+//      movq    Q(, %rdi, 8), %rax      %rax <- xq + 8(5j + i)
+//      addq    P(, %rdx, 8), %rax      %rax <- %rax + xp + 8(7i + j)
+long sum_element(long i, long j) {
+    return P[i][j] + Q[j][i];
+}