Struct prob int p struct int x int y s struct prob

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Unformatted text preview: red in memory in “row major” order, meaning all elements of row 0, followed by all elements of row 1, and so on. Element A[0][0] A[0][1] A[0][2] A[1][0] A[1][1] A[1][2] A[2][0] A[2][1] A[2][2] A[3][0] A[3][1] A[3][2] ÜA ÜA · ÜA · ÜA · ½¾ ÜA · ½ ÜA · ¾¼ ÜA · ¾ ÜA · ¾ ÜA · ¿¾ ÜA · ¿ ÜA · ¼ ÜA · Address This ordering is a consequence of our nested declaration. Viewing A as an array of four elements, each of which is an array of three int’s, we first have A[0] (i.e., row 0), followed by A[1], and so on. To access elements of multidimensional arrays, the compiler generates code to compute the offset of the desired element and then uses a movl instruction using the start of the array as the base address and the (possibly scaled) offset as an index. In general, for an array declared as: Ì D[Ê][ ]; As an example, consider the ¢ ¿ integer array A defined earlier. Suppose register %eax contains ÜA , that %edx holds i, and %ecx holds j. Then array element A[i][j] can be cop...
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This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

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