user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<acf>:
  endbr64
  push   %rbp
  mov    %rdx,%r10
  push   %rbx
  mov    %rcx,%rbx
  test   %rsi,%rsi
  je     L184
  cmp    $0x1,%rsi
  je     L172
  mov    %rsi,%rdx
  pxor   %xmm4,%xmm4
  mov    %rdi,%rax
  shr    %rdx
  movapd %xmm4,%xmm3
  shl    $0x4,%rdx
  add    %rdi,%rdx
  nopw   0x0(%rax,%rax,1)
L109:
  movsd  (%rax),%xmm0
  add    $0x10,%rax
  addsd  %xmm0,%xmm3
  movsd  -0x8(%rax),%xmm0
  addsd  %xmm0,%xmm3
  cmp    %rdx,%rax
  jne    L109
  mov    %rsi,%rax
  and    $0xfffffffffffffffe,%rax
  test   $0x1,%sil
  je     L48
L187:
  addsd  (%rdi,%rax,8),%xmm3
L48:
  pxor   %xmm0,%xmm0
  lea    0x1(%r10),%rbp
  mov    %rsi,%r11
  mov    %r8,%rdx
  cvtsi2sd %rsi,%xmm0
  cmp    %rsi,%rbp
  mov    %rdi,%rcx
  cmovbe %rbp,%r11
  xor    %r9d,%r9d
  divsd  %xmm0,%xmm3
L120:
  movq   $0x0,(%rdx)
  mov    %r9,%rax
  movapd %xmm4,%xmm2
  xchg   %ax,%ax
L135:
  movsd  (%rdi,%rax,8),%xmm0
  movsd  (%rcx,%rax,8),%xmm1
  add    $0x1,%rax
  subsd  %xmm3,%xmm0
  subsd  %xmm3,%xmm1
  mulsd  %xmm1,%xmm0
  addsd  %xmm0,%xmm2
  movsd  %xmm2,(%rdx)
  cmp    %rax,%rsi
  ja     L135
  add    $0x1,%r9
  add    $0x8,%rdx
  sub    $0x8,%rcx
  cmp    %r11,%r9
  jb     L120
  cmp    %r9,%r10
  jb     L141
L158:
  mov    %r10,%rcx
  lea    0x1(%r9),%rax
  sub    %r9,%rcx
  cmp    %rax,%rbp
  setae  %sil
  cmp    $0x5,%rcx
  seta   %dl
  test   %dl,%sil
  je     L108
  cmp    $0xffffffffffffffff,%r10
  je     L108
  add    $0x1,%rcx
  lea    (%r8,%r9,8),%rsi
  pxor   %xmm0,%xmm0
  xor    %eax,%eax
  mov    %rcx,%rdi
  shr    %rdi
  nopl   0x0(%rax)
L218:
  mov    %rax,%rdx
  add    $0x1,%rax
  shl    $0x4,%rdx
  movups %xmm0,(%rsi,%rdx,1)
  cmp    %rax,%rdi
  ja     L218
  mov    %rcx,%rax
  and    $0xfffffffffffffffe,%rax
  add    %rax,%r9
  cmp    %rax,%rcx
  je     L141
  movq   $0x0,(%r8,%r9,8)
L141:
  test   %rbx,%rbx
  je     L174
  test   %r10,%r10
  je     L203
  cmp    $0x1,%r10
  je     L142
  mov    %r10,%rdx
  movsd  (%r8),%xmm1
  mov    %r8,%rax
  shr    %rdx
  shl    $0x4,%rdx
  unpcklpd %xmm1,%xmm1
  add    %r8,%rdx
  nopl   0x0(%rax,%rax,1)
L168:
  movupd 0x8(%rax),%xmm0
  add    $0x10,%rax
  divpd  %xmm1,%xmm0
  movups %xmm0,-0x8(%rax)
  cmp    %rdx,%rax
  jne    L168
  mov    %r10,%rax
  or     $0x1,%rax
  and    $0x1,%r10d
  je     L203
  lea    (%r8,%rax,8),%rax
  movsd  (%rax),%xmm0
  divsd  (%r8),%xmm0
  movsd  %xmm0,(%rax)
L203:
  mov    D3(%rip),%rax
  mov    %rax,(%r8)
L174:
  pop    %rbx
  pop    %rbp
  ret
  nopl   0x0(%rax)
L10:
  add    $0x1,%rax
L108:
  movq   $0x0,(%r8,%r9,8)
  mov    %rax,%r9
  cmp    %rax,%r10
  jae    L10
  jmp    L141
L184:
  xor    %r9d,%r9d
  lea    0x1(%rdx),%rbp
  jmp    L158
L142:
  lea    0x8(%r8),%rax
  lea    0x10(%r8),%rdx
  nopl   (%rax)
L139:
  movsd  (%rax),%xmm0
  add    $0x8,%rax
  divsd  (%r8),%xmm0
  movsd  %xmm0,-0x8(%rax)
  cmp    %rdx,%rax
  jne    L139
  jmp    L203
L172:
  pxor   %xmm4,%xmm4
  xor    %eax,%eax
  movapd %xmm4,%xmm3
  jmp    L187
```

tool_calls: name: parse_data
arguments: data_tag: D3
data_type: f64

tool: D3: 1

assistant: ```c
void acf(double *x, int32_t N, int64_t k, int16_t norm, double *rxx) {
  int64_t i, n;
  double sum = 0, mean = 0;
  for (i = 0; i < N; i++)
    sum += x[i];
  mean = sum / N;
  for (i = 0; i <= k; i++) {
    rxx[i] = 0.0;
    for (n = i; n < N; n++)
      rxx[i] += (x[n] - mean) * (x[n - i] - mean);
  }
  if (norm) {
    for (i = 1; i <= k; i++)
      rxx[i] /= rxx[0];
    rxx[0] = 1.0;
  }
}
```