Add fizzbuzz operand size suffixes

fizzbuzz/fizzbuzz.s

@@ -51,7 +51,7 @@ test_fizz:
         div %rbx
         cmp $0, %rdx    # Was the remainder 0?
         jne test_buzz   # If not, test division by 5.
-        add $1, 8(%rsp) # Otherwise, increment the print case.
+        addq $1, 8(%rsp) # Otherwise, increment the print case.
 test_buzz:
         mov 24(%rsp), %rax # Retrieve the counter again.
         movq $5, %rbx      # Use 5 as the divisor for "buzz" test.
@@ -59,7 +59,7 @@ test_buzz:
         div %rbx
         cmp $0, %rdx          # Was the remainder 0?
         jne return_print_case # If not, return.
-        add $2, 8(%rsp)       # Otherwise, increment the print case by two.
+        addq $2, 8(%rsp)       # Otherwise, increment the print case by two.
 return_print_case:
         mov 8(%rsp), %rax # Put the print case in %rax.
         mov %rbp, %rsp
@@ -136,13 +136,13 @@ _print:
         # %rcx will hold the address of the buffer to be printed.
         # %rdx will hold the number of bytes to write.
         # How these are set depends on the print case:
-        cmp $0, 16(%rsp)
+        cmpq $0, 16(%rsp)
         je print_counter
-        cmp $1, 16(%rsp)
+        cmpq $1, 16(%rsp)
         je print_fizz
-        cmp $2, 16(%rsp)
+        cmpq $2, 16(%rsp)
         je print_buzz
-        cmp $3, 16(%rsp)
+        cmpq $3, 16(%rsp)
         je print_fizzbuzz
 print_counter:
         # We need to convert the counter to ASCII.