汇编，为什么我的代码（应该正确）为什么不运行？

Question

我是汇编的总入门者，并且我用汇编语言（x86-64）编写了以下代码，该代码应该正确，但是仍然会出错。 我在虚拟机中使用“ centOS Linux”，作为IDE，我使用“ Code :: Blocks IDE”。

这是我尝试运行的代码：

#This program finds the maximum number of a
    #set of data items.
    #

    #The registers have the following uses:
    #
    # %rdx - Holds the index of the data item being examined 
    # %rdi - Largest data item found
    # %rax - Current data item
    #
    # The following memory locations are used:
    #
    # data_items - contains the item data.  A 0 is used
    #              to terminate the data
    #

    .section .data

data_items:                       #These are the data items
    .quad 3,67,34,222,45,75,54,34,44,33,22,11,66,0

    .section .text

    .globl _start
_start:
    movq $0, %rdx             # move 0 into the index register
    movq data_items(,%rdx,8), %rax # load the first byte of data
    movq %rax, %rdi           # since this is the first item, %rax is
                              # the biggest

start_loop:                   # start loop
    cmpq $0, %rax             # check to see if we've hit the end
    je loop_exit
    incq %rdx                 # load next value
    movq data_items(,%rdx,8), %rax 
    cmpq %rdi, %rax           # compare values
    jle start_loop            # jump to loop beginning if the new 
                              # one isn't bigger
    movq %rax, %rdi           # move the value as the largest 
    jmp start_loop            # jump to loop beginning

loop_exit:
    # %rdi is the status code for the exit system call
    # and it already contains the maximum number
    movq $60, %rax                # 60 is the exit() syscall
    syscall

这是我在IDE中得到的输出：

output

我的假设是我选择了错误的编译器？