2.2 By lookup using the table in Figure 2.5 on page 62,
7fff fffahex = 0111 1111 1111 1111 1111 1111 1111 1010two
= 2,147,483,642ten.
2.3 By lookup using the table in Figure 2.5 on page 62,
1100 1010 1111 1110 1111 1010 1100 1110two = cafe facehex.
2.6
sll $t0, $t3, 9 # shift $t3 left by 9, store in $t0
srl $t0, $t0, 15 # shift $t0 right by 15
2.15 Hence, the results from using if-else statements are better.
set_array: addi $sp, $sp, -52 # move stack pointer
sw $fp, 48($sp) # save frame pointer
sw $ra, 44($sp) # save return address
sw $a0, 40($sp) # save parameter (num)
addi $fp, $sp, 48 # establish frame pointer
add $s0, $zero, $zero # i = 0
addi $t0, $zero, 10 # max iterations is 10
loop: sll $t1, $s0, 2 # $t1 = i * 4
add $t2, $sp, $t1 # $t2 = address of array[i]
add $a0, $a0, $zero # pass num as parameter
add $a1, $s0, $zero # pass i as parameter
jal compare # call compare(num, i)
sw $v0, 0($t2) # array[i] = compare(num, i);
addi $s0, $s0, 1
bne $s0, $t0, loop # loop if i<10
lw $a0, 40($sp) # restore parameter (num)
lw $ra, 44($sp) # restore return address
lw $fp, 48($sp) # restore frame pointer
addi $sp, $sp, 52 # restore stack pointer
jr $ra # return
compare: addi $sp, $sp, -8 # move stack pointer
sw $fp, 4($sp) # save frame pointer
sw $ra, 0($sp) # save return address
addi $fp, $sp, 4 # establish frame pointer
jal sub # can jump directly to sub
slt $v0, $v0, $zero # if sub(a,b) >= 0, return 1
slti $v0, $v0, 1
lw $ra, 0($sp) # restore return address
lw $fp, 4($sp) # restore frame pointer
addi $sp, $sp, 8 # restore stack pointer
jr $ra # return
sub: sub $v0, $a0, $a1 # return a-b
jr $ra # return
