user: Demonstrate the C code that generates the assembly output below:

```asm
<checksum>:
  endbr64
  movzbl %cl,%eax
  movzbl %ch,%ecx
  add    %edx,%eax
  add    %ecx,%eax
  add    %r8d,%eax
  test   %esi,%esi
  je     L117
  lea    -0x1(%rsi),%edx
  cmp    $0xe,%edx
  jbe    L10
  mov    %esi,%ecx
  pxor   %xmm0,%xmm0
  pxor   %xmm4,%xmm4
  mov    %rdi,%rdx
  shr    $0x4,%ecx
  pxor   %xmm3,%xmm3
  sub    $0x1,%ecx
  shl    $0x4,%rcx
  lea    0x10(%rdi,%rcx,1),%rcx
  nopl   (%rax)
L167:
  movdqu (%rdx),%xmm1
  add    $0x10,%rdx
  movdqa %xmm1,%xmm2
  punpckhbw %xmm4,%xmm1
  punpcklbw %xmm4,%xmm2
  movdqa %xmm2,%xmm5
  punpckhwd %xmm3,%xmm2
  punpcklwd %xmm3,%xmm5
  paddd  %xmm5,%xmm0
  paddd  %xmm2,%xmm0
  movdqa %xmm1,%xmm2
  punpckhwd %xmm3,%xmm1
  punpcklwd %xmm3,%xmm2
  paddd  %xmm2,%xmm0
  paddd  %xmm1,%xmm0
  cmp    %rcx,%rdx
  jne    L167
  movdqa %xmm0,%xmm1
  psrldq $0x8,%xmm1
  paddd  %xmm1,%xmm0
  movdqa %xmm0,%xmm1
  psrldq $0x4,%xmm1
  paddd  %xmm1,%xmm0
  movd   %xmm0,%edx
  add    %edx,%eax
  mov    %esi,%edx
  and    $0xfffffff0,%edx
  test   $0xf,%sil
  je     L117
L94:
  movslq %edx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0x1(%rdx),%ecx
  cmp    %esi,%ecx
  jae    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0x2(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0x3(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0x4(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0x5(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0x6(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0x7(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0x8(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0x9(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0xa(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0xb(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0xc(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  lea    0xd(%rdx),%ecx
  cmp    %ecx,%esi
  jbe    L117
  movslq %ecx,%rcx
  add    $0xe,%edx
  movzbl (%rdi,%rcx,1),%ecx
  add    %ecx,%eax
  cmp    %edx,%esi
  jbe    L117
  movslq %edx,%rdx
  movzbl (%rdi,%rdx,1),%edx
  add    %edx,%eax
L117:
  neg    %eax
  ret
L10:
  xor    %edx,%edx
  jmp    L94
```

assistant: ```c
unsigned char checksum(unsigned char *buf, unsigned int length, int chunk_len, int chunk_addr, int chunk_type) {
  int sum = chunk_len + (((chunk_addr)&0xff)) + ((((chunk_addr)&0xff00) >> 8)) + chunk_type;
  int i;
  for (i = 0; i < length; i++) {
    sum += buf[i];
  }
  int complement = (~sum + 1);
  return complement & 0xff;
}
```