Прикреплённый файл «column-major.asm»
Загрузка 1 ################################################################
2 #
3 # Column-major order traversal of 16 x 16 array of words.
4 # Pete Sanderson
5 # 31 March 2007
6 #
7 # To easily observe the column-oriented order, run the Memory Reference
8 # Visualization tool with its default settings over this program.
9 # You may, at the same time or separately, run the Data Cache Simulator
10 # over this program to observe caching performance. Compare the results
11 # with those of the row-major order traversal algorithm.
12 #
13 # The C/C++/Java-like equivalent of this MIPS program is:
14 # int size = 16;
15 # int[size][size] data;
16 # int value = 0;
17 # for (int col = 0; col < size; col++) {
18 # for (int row = 0; row < size; row++) }
19 # data[row][col] = value;
20 # value++;
21 # }
22 # }
23 #
24 # Note: Program is hard-wired for 16 x 16 matrix. If you want to change this,
25 # three statements need to be changed.
26 # 1. The array storage size declaration at "data:" needs to be changed from
27 # 256 (which is 16 * 16) to #columns * #rows.
28 # 2. The "li" to initialize $t0 needs to be changed to the new #rows.
29 # 3. The "li" to initialize $t1 needs to be changed to the new #columns.
30 #
31 .data
32 data: .word 0 : 256 # 16x16 matrix of words
33 .text
34 li $t0, 16 # $t0 = number of rows
35 li $t1, 16 # $t1 = number of columns
36 move $s0, $zero # $s0 = row counter
37 move $s1, $zero # $s1 = column counter
38 move $t2, $zero # $t2 = the value to be stored
39 # Each loop iteration will store incremented $t1 value into next element of matrix.
40 # Offset is calculated at each iteration. offset = 4 * (row*#cols+col)
41 # Note: no attempt is made to optimize runtime performance!
42 loop: mult $s0, $t1 # $s2 = row * #cols (two-instruction sequence)
43 mflo $s2 # move multiply result from lo register to $s2
44 add $s2, $s2, $s1 # $s2 += col counter
45 sll $s2, $s2, 2 # $s2 *= 4 (shift left 2 bits) for byte offset
46 sw $t2, data($s2) # store the value in matrix element
47 addi $t2, $t2, 1 # increment value to be stored
48 # Loop control: If we increment past bottom of column, reset row and increment column
49 # If we increment past the last column, we're finished.
50 addi $s0, $s0, 1 # increment row counter
51 bne $s0, $t0, loop # not at bottom of column so loop back
52 move $s0, $zero # reset row counter
53 addi $s1, $s1, 1 # increment column counter
54 bne $s1, $t1, loop # loop back if not at end of matrix (past the last column)
55 # We're finished traversing the matrix.
56 li $v0, 10 # system service 10 is exit
57 syscall # we are outta here.
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