x86-64: Effective address' index is 0, unexpected offset

In an attempt to implement arrays in my programming language that compiles to assembly, I am struggling with expressions like array[0]. I have tested other indices like 1, 2, etc. and they work, but array[0] always returns 0, no matter what value is actually stored there in the array.

Assuming an array has these elements: [85, 15, 76, 58, 17], then element 0 should be 85.Here is the code my compiler generates, can you see what is wrong with this?

.text.globl main.type main, @functionmain:  .cfi_startproc  pushq %rbp  movq %rsp, %rbp  call usr_main  mov %rax, %rdi  movq $60, %rax  syscall  movq %rbp, %rsp  pop %rbp  ret  .cfi_endproc.size main, .-main.type usr_main, @functionusr_main:    .cfi_startproc    push %rbp    movq %rsp, %rbp    # define array    movq $85, -8(%rbp)    movq $15, -16(%rbp)    movq $76, -24(%rbp)    movq $58, -32(%rbp)    movq $17, -40(%rbp)    push $0 # an "offset", based on the size of other defined arrays (there are none)    # Evaluate computed array expr (index expr)    # IndexExpr Step 1: Evaluate offset of array    # find "offset"    movq (%rsp), %rdx    # IndexExpr Step 2: Evaluate computed expr (the index)    movq $0, %rbx # index of 0    # IndexExpr Step 3: Do some nerd stuff for %rbp offset    add %rdx, %rbx    neg %rbx    # IndexExpr Step 4: Evaluate offset from %rbp and return the expr    movq -8(%rbp, %rbx, 8), %rax    movq %rbp, %rsp    pop %rbp    ret    .cfi_endproc    .size usr_main, .-usr_main

I have tried changing the offset in the effective address -8 to other values, however each time array[0] always returns 0.I have also tried incrementing %rbx before the effective address and setting the offset to 0, with no luck.