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2k48.asm
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2k48.asm
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.text
# slide ($a0. $a1, $a2)
# return ($v0, $v1, $k0)
slide:
lw $ra, 0($sp)
lw $s0, 4($sp)
lw $s1, 8($sp)
lw $s6, 12($sp)
lw $s7, 16($sp)
lw $s4, 20($sp)
addi $sp, $sp, 24
addi $s0, $a0, 0 # read registers
addi $s1, $a1, 0
addi $s6, $s6, 0 # rotations before slide
addi $s7, $s7, 0 # rotations after slide
addi $s4, $s4, 0 # win flag
beq $a2, 0, slide_right
beq $a2, 1, slide_left
beq $a2, 2, slide_up
beq $a2, 3, slide_down
slide_right:
addi $s6, $s6, 0
addi $s7, $s7, 0
j slide_before
slide_left:
addi $s6, $s6, 2
addi $s7, $s7, 2
j slide_before
slide_up:
addi $s6, $s6, 1
addi $s7, $s7, 3
j slide_before
slide_down:
addi $s6, $s6, 3
addi $s7, $s7, 1
j slide_before
slide_before:
beq $s6, 0, slide_doslide
addi $s6, $s6, -1
jal rotate
addi $a0, $v0, 0
addi $a1, $v1, 0
j slide_before
slide_doslide:
jal slideRightTable
addi $a0, $v0, 0
addi $a1, $v1, 0
addi $s4, $k0, 0
slide_after:
beq $s7, 0, slide_r
addi $s7, $s7, -1
jal rotate
addi $a0, $v0, 0
addi $a1, $v1, 0
j slide_after
slide_r:
addi $k0, $s4, 0
lw $ra, 0($sp)
lw $s0, 4($sp)
lw $s1, 8($sp)
lw $s6, 12($sp)
lw $s7, 16($sp)
lw $s4, 20($sp)
addi $sp, $sp, 24
jr $ra
# Take a 4x4 array as input and rotates it clockwise
# rotate ($a0, $a1):
# return ($v0, $v1)
rotate:
lw $ra, 0($sp)
lw $s0, 4($sp)
lw $s1, 8($sp)
lw $s2, 12($sp)
lw $s3, 16($sp)
addi $sp, $sp, 20
add $s0, $a0, $zero # write registers
add $s1, $a1, $zero
add $s2, $a0, $zero # read registers
add $s3, $a1, $zero
andi $a0, $s2, 0xff
andi $a1, $s2, 0xff0000
jal rotateRight4
andi $s1, $s1, 0xff00ff00
or $a0, $a0, $a1
or $s1, $s1, $a0
andi $a0, $s3, 0xff
andi $a1, $s3, 0xff0000
jal rotateRight4
andi $s1, $s1, 0x00ff00ff
or $a0, $a0, $a1
or $s1, $s1, $a0
andi $a0, $s3, 0xff00
andi $a1, $s3, 0xff000000
jal rotateRight4
andi $s0, $s0, 0x00ff00ff
or $a0, $a0, $a1
or $s0, $s0, $a0
andi $a0, $s2, 0xff00
andi $a1, $s2, 0xff000000
jal rotateRight4
andi $s0, $s0, 0xff00ff00
or $a0, $a0, $a1
or $s0, $s0, $a0
lw $, 0($sp)
addi $sp, $sp, 4
jr $ra
# Takes a 2x2 array as an input and rotates right (clock-wise).
# rotateRight4 ($a0, $a1):
# return ($v0, $v1)
rotateRight4:
andi $t0, $a0, 0xf
srl $a0, $a0, 4
andi $t1, $a1, 0xf0
sll $a1, $a1, 4
andi $a1, $a1, 0xff
add $a1, $a1, $t0
sll $t1, $t1, 4
add $a0, $a0, $t1
addi $v0, $a0, 0
addi $v1, $a1, 0
jr $ra
# Takes an array as input and slides it right
# slideRightTable ($a0, $a1):
# return ($v0, $v1, $k0)
# !! $k0 must change and its content should be pushed to stack instead !!
slideRightTable:
lw $ra, 0($sp)
lw $s0, 4($sp)
lw $s1, 8($sp)
lw $s2, 12($sp)
lw $s3, 16($sp)
lw $s5, 20($sp)
lw $s4, 24($sp)
addi $sp, $sp, 28
addi $s0, $a0, 0 # write
addi $s1, $a1, 0
addi $s2, $a0, 0 # read
addi $s3, $a1, 0
addi $s5, $zero, 0 # win flag
addi $s4, $zero, 2 # loop counter
slideRightTable_s2:
beq $s4, -1, slideRightTable_s3
addi $s4, $s4, -1
addi $a0, $s2, 0
addi $a1, $s4, 0
jal slideRightRow
sll $s0, $s0, 16
or $s0, $s0, $v0
add $s5, $s5, $v1
j slideRightTable_s2
addi $s4, $zero, 2
slideRightTable_s3:
beq $s4, -1, slideRightTable_r
addi $s4, $s4, -1
addi $a0, $s3, 0
addi $a1, $s4, 0
jal slideRightRow
sll $s1, $s1, 16
or $s1, $s1, $v0
add $s5, $s5, $v1
j slideRightTable_s3
slideRightTable_r:
lw $ra, 0($sp)
lw $s0, 4($sp)
lw $s1, 8($sp)
lw $s2, 12($sp)
lw $s3, 16($sp)
lw $s5, 20($sp)
lw $s4, 24($sp)
addi $sp, $sp, 28
addi $v0, $s0, 0
addi $v1, $s1, 0
addi $k0, $s5, 0
# Takes a line and slides it right.
# slideRight ($a0, $a1):
# $a0: the row
# $a1: 1 if no shift needed
# 0 if 16-bit shift needed
# return ($v0, $v1)
# $v0 : the line slided right
# $v1 : if there is a winner
slideRightRow:
lw $ra, 0($sp)
lw $s0, 4($sp)
lw $s1, 8($sp)
lw $s2, 12($sp)
lw $s3, 16($sp)
lw $s4, 20($sp)
addi $sp, $sp, 24
jal removeBlankRight
bne $a1, 1, slideRightRow_noshift
srl $a0, $a0, 16
slideRightRow_noshift:
andi $a0, $a0, 0xffff # apply mask to the line
addi $s0, $v0, 0 # $s0 = line with non blank cells
addi $s1, $v1, -1 # loop counter, number of comparisons
addi $s2, $zero, 0 # the under-construction line
addi $s3, $zero, 0 # the line-shift merge counter
addi $s4, $zero, 0
slideRightRow_l1:
beq $s1, 0, slideRightRow_r
addi $s1, $s1, -1
srl $t3, $s0, 0
srl $t4, $s0, 4
srl $s0, $s0, 4
andi $t3, $t3, 15
andi $t4, $t4, 15
addi $a0, $t4, 0
addi $a1, $t3, 0
jal addCells
beq $v1, 1, slideRightRow_merge
j slideRightRow_l1
slideRightRow_merge:
sllv $v0, $v0, $s3
addi $s3, $s3, 4
bge $v0, 11, slideRightRow_win
add $s2, $s2, $v0
j slideRightRow_l1
slideRightRow_win:
addi $s4, $zero, 1
j slideRightRow_l1
slideRightRow_r:
lw $ra, 0($sp)
lw $s1, 4($sp)
lw $s2, 8($sp)
lw $s3, 12($sp)
lw $s4, 16($sp)
addi $sp, $sp, 20
addi $v0, $s2, 0
addi $v1, $s4, 0
jr $ra
# Checks if the given cells are equal and if they are it returns the sum.
# addCells ($a0, $a1):
# return ($v0, $v1)
# $v0 : the sum ($v1 should be checked first)
# $v1 : if cells where equal
addCells:
sub $t0, $a0, $a1
beq $t0, 0, addCells_equal
addi $v0, $zero, 0
addi $v1, $zero, 0
jr $ra
addCells_equal:
add $v0, $a0, $a1
addi $v1, $zero, 1
jr $ra
# Removes blank cells if exist and slides to the line to the right
# removeBlankCellsRight ($a0):
# return ($v0, $v1)
# $v0 : $a0 without blank cells, idented right
# $v1 : number of non blank cells in the line
removeBlankRight:
addi $t1, $zero, 4 # the loop counter (we have 4 cells)
addi $t2, $a0, 0 # t3 = a0
addi $t4, $zero, 0 # merge shift left counter
addi $v1, $zero, 0 # format $v1
removeBlankRight_l1:
beq $t1, 0, removeBlankRight_r
subi $t1, $t1, 1
addi $t3, $t2, 0
srl $t2, $t2, 4
andi $t3, $t3, 15 # Masks all 32-bits except for the first 4
bne $t3, $zero, removeBlankRight_merge
j removeBlankRight_l1
removeBlankRight_merge:
sllv $t3, $t3, $t4
addi $t4, $t4, 4
add $v0, $v0, $t3
j removeBlankRight_l1
removeBlankRight_r:
beq $t4, 0, removeBlankRight_r1
sra $v1, $t4, 2
removeBlankRight_r1:
jr $ra