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

```asm
<docheck>:
  endbr64
  push   %r12
  mov    %rdi,%r12
  push   %rbp
  mov    %edx,%ebp
  and    $0x1,%edx
  push   %rbx
  mov    %rsi,%rbx
  jne    L91
  test   %ebp,%ebp
  jle    L206
L26:
  lea    -0x1(%rbp),%eax
  mov    %eax,%ecx
  shr    %ecx
  add    $0x1,%ecx
  cmp    $0x1d,%eax
  jbe    L39
  mov    %ecx,%edx
  pxor   %xmm7,%xmm7
  pxor   %xmm4,%xmm4
  mov    %rbx,%rax
  shr    $0x4,%edx
  movdqa D0(%rip),%xmm5
  pxor   %xmm3,%xmm3
  pxor   %xmm2,%xmm2
  sub    $0x1,%edx
  shl    $0x5,%rdx
  lea    0x20(%rbx,%rdx,1),%rdx
L87:
  movdqu (%rax),%xmm1
  movdqu 0x10(%rax),%xmm0
  movdqa %xmm2,%xmm10
  add    $0x20,%rax
  movdqu -0x10(%rax),%xmm6
  pand   %xmm5,%xmm0
  pand   %xmm5,%xmm1
  packuswb %xmm0,%xmm1
  movdqu -0x20(%rax),%xmm0
  psrlw  $0x8,%xmm6
  movdqa %xmm1,%xmm8
  punpckhbw %xmm4,%xmm1
  psrlw  $0x8,%xmm0
  punpcklbw %xmm4,%xmm8
  packuswb %xmm6,%xmm0
  movdqa %xmm0,%xmm6
  punpckhbw %xmm4,%xmm0
  punpcklbw %xmm4,%xmm6
  psllw  $0x8,%xmm0
  psllw  $0x8,%xmm6
  por    %xmm1,%xmm0
  por    %xmm8,%xmm6
  movdqa %xmm0,%xmm8
  punpckhwd %xmm3,%xmm0
  movdqa %xmm6,%xmm9
  punpckhwd %xmm3,%xmm6
  punpcklwd %xmm3,%xmm8
  punpcklwd %xmm3,%xmm9
  pcmpgtd %xmm9,%xmm10
  movdqa %xmm9,%xmm1
  punpckldq %xmm10,%xmm1
  punpckhdq %xmm10,%xmm9
  paddq  %xmm7,%xmm1
  movdqa %xmm2,%xmm7
  pcmpgtd %xmm6,%xmm7
  paddq  %xmm9,%xmm1
  movdqa %xmm6,%xmm9
  punpckldq %xmm7,%xmm9
  punpckhdq %xmm7,%xmm6
  movdqa %xmm2,%xmm7
  pcmpgtd %xmm8,%xmm7
  paddq  %xmm9,%xmm1
  paddq  %xmm6,%xmm1
  movdqa %xmm8,%xmm6
  punpckldq %xmm7,%xmm6
  paddq  %xmm6,%xmm1
  movdqa %xmm8,%xmm6
  punpckhdq %xmm7,%xmm6
  movdqa %xmm0,%xmm7
  paddq  %xmm6,%xmm1
  movdqa %xmm2,%xmm6
  pcmpgtd %xmm0,%xmm6
  punpckldq %xmm6,%xmm7
  punpckhdq %xmm6,%xmm0
  paddq  %xmm7,%xmm1
  movdqa %xmm1,%xmm7
  paddq  %xmm0,%xmm7
  cmp    %rdx,%rax
  jne    L87
  movdqa %xmm7,%xmm0
  psrldq $0x8,%xmm0
  paddq  %xmm0,%xmm7
  movq   %xmm7,%rax
  add    %rax,%r12
  mov    %ecx,%eax
  and    $0xfffffff0,%eax
  lea    (%rax,%rax,1),%edx
  cmp    %ecx,%eax
  je     L206
L173:
  movslq %edx,%rcx
  movzbl 0x1(%rbx,%rcx,1),%eax
  movzbl (%rbx,%rcx,1),%ecx
  shl    $0x8,%eax
  or     %ecx,%eax
  lea    0x2(%rdx),%ecx
  cltq
  add    %r12,%rax
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0x4(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0x6(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0x8(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0xa(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0xc(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0xe(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0x10(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0x12(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0x14(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0x16(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0x18(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  lea    0x1a(%rdx),%ecx
  cmp    %ecx,%ebp
  jle    L45
  movslq %ecx,%rsi
  add    $0x1c,%edx
  movzbl 0x1(%rbx,%rsi,1),%ecx
  movzbl (%rbx,%rsi,1),%esi
  shl    $0x8,%ecx
  or     %esi,%ecx
  movslq %ecx,%rcx
  add    %rcx,%rax
  cmp    %edx,%ebp
  jle    L45
  movslq %edx,%rdx
  movzbl 0x1(%rbx,%rdx,1),%ecx
  movzbl (%rbx,%rdx,1),%edx
  shl    $0x8,%ecx
  or     %ecx,%edx
  movslq %edx,%rdx
  add    %rdx,%rax
L45:
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
  nopl   0x0(%rax,%rax,1)
L91:
  lea    D2(%rip),%rsi
  mov    $0x1,%edi
  call   <error@plt>
  test   %ebp,%ebp
  jg     L26
L206:
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
L39:
  xor    %edx,%edx
  jmp    L173
```

tool_calls: name: read_data
arguments: label: D0
data_type: byte[16]
name: read_data
arguments: label: D2
data_type: string

tool: {"D0": [0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00]}

tool: D2: We should never see an odd number of bytes in this app.


assistant: ```c
long docheck(long check, unsigned char *buf, int len) {
  int i;
  if (len & 1)
    error(1, "We should never see an odd number of bytes in this app.\n");
  for (i = 0; i < len; i += 2)
    check += (buf[i] << 0) | (buf[i + 1] << 8);
  return check;
}
```