user: 请将以下的汇编代码转换成C语言代码：

```asm
<xsq_to_stddev>:
  endbr64
  movapd %xmm1,%xmm7
  push   %rbx
  movapd %xmm1,%xmm3
  mov    %rdi,%rbx
  divsd  %xmm2,%xmm7
  sub    $0x30,%rsp
  subsd  D51(%rip),%xmm3
  movsd  %xmm2,0x18(%rsp)
  movsd  %xmm1,0x10(%rsp)
  movsd  %xmm3,(%rsp)
  addsd  %xmm0,%xmm7
  movapd %xmm7,%xmm0
  movsd  %xmm7,0x8(%rsp)
  divsd  %xmm3,%xmm0
  call   <log@plt>
  movsd  (%rsp),%xmm3
  pxor   %xmm5,%xmm5
  movsd  0x8(%rsp),%xmm7
  movsd  0x10(%rsp),%xmm1
  movsd  0x18(%rsp),%xmm2
  mulsd  %xmm3,%xmm0
  movapd %xmm7,%xmm6
  subsd  %xmm3,%xmm6
  subsd  %xmm0,%xmm6
  comisd %xmm6,%xmm5
  ja     L41
  ucomisd %xmm6,%xmm5
  ja     L27
L17:
  sqrtsd %xmm6,%xmm6
L78:
  movsd  D48(%rip),%xmm4
  divsd  %xmm3,%xmm4
  ucomisd %xmm4,%xmm5
  ja     L28
  sqrtsd %xmm4,%xmm4
L71:
  comisd %xmm7,%xmm3
  divsd  D42(%rip),%xmm4
  jb     L112
  subsd  %xmm6,%xmm4
  movapd %xmm4,%xmm1
L46:
  addsd  %xmm3,%xmm3
  movapd %xmm1,%xmm4
  andpd  D76(%rip),%xmm4
  ucomisd %xmm3,%xmm5
  ja     L136
  sqrtsd %xmm3,%xmm3
L18:
  divsd  %xmm3,%xmm2
  xor    %eax,%eax
  movapd %xmm1,%xmm0
  comisd %xmm2,%xmm4
  seta   %al
  mov    %eax,(%rbx)
  add    $0x30,%rsp
  pop    %rbx
  ret
  xchg   %ax,%ax
L41:
  movapd %xmm5,%xmm6
  jmp    L17
  cs nopw 0x0(%rax,%rax,1)
L112:
  movapd %xmm2,%xmm0
  movsd  %xmm4,0x28(%rsp)
  addsd  %xmm7,%xmm0
  xorpd  D63(%rip),%xmm0
  movsd  %xmm6,0x20(%rsp)
  movsd  %xmm3,0x18(%rsp)
  divsd  %xmm1,%xmm0
  movsd  %xmm2,0x10(%rsp)
  movsd  %xmm7,0x8(%rsp)
  movsd  %xmm1,(%rsp)
  call   <exp@plt>
  movsd  0x10(%rsp),%xmm2
  movsd  0x8(%rsp),%xmm7
  movsd  (%rsp),%xmm1
  movapd %xmm0,%xmm8
  divsd  %xmm2,%xmm7
  movsd  %xmm2,0x8(%rsp)
  movapd %xmm1,%xmm0
  addsd  D51(%rip),%xmm7
  divsd  %xmm7,%xmm0
  movsd  D51(%rip),%xmm7
  subsd  %xmm8,%xmm7
  mulsd  %xmm7,%xmm0
  divsd  %xmm0,%xmm1
  movapd %xmm0,%xmm7
  addsd  %xmm0,%xmm7
  movsd  %xmm7,(%rsp)
  movapd %xmm1,%xmm0
  call   <log@plt>
  movsd  0x8(%rsp),%xmm2
  movsd  (%rsp),%xmm7
  pxor   %xmm5,%xmm5
  movsd  0x18(%rsp),%xmm3
  movsd  0x20(%rsp),%xmm6
  movapd %xmm2,%xmm1
  movsd  0x28(%rsp),%xmm4
  addsd  %xmm2,%xmm1
  subsd  D51(%rip),%xmm1
  subsd  %xmm7,%xmm1
  mulsd  %xmm0,%xmm1
  movsd  D16(%rip),%xmm0
  subsd  %xmm7,%xmm1
  addsd  D96(%rip),%xmm1
  comisd %xmm1,%xmm0
  ja     L20
  movapd %xmm1,%xmm0
  subsd  D96(%rip),%xmm0
  movsd  %xmm2,0x20(%rsp)
  movsd  %xmm4,0x18(%rsp)
  movsd  %xmm6,0x10(%rsp)
  movsd  %xmm3,0x8(%rsp)
  movsd  %xmm1,(%rsp)
  call   <log@plt>
  movsd  (%rsp),%xmm1
  pxor   %xmm5,%xmm5
  movsd  0x8(%rsp),%xmm3
  movsd  0x10(%rsp),%xmm6
  movsd  0x18(%rsp),%xmm4
  subsd  %xmm0,%xmm1
  subsd  D96(%rip),%xmm1
  movsd  0x20(%rsp),%xmm2
  ucomisd %xmm1,%xmm5
  ja     L44
L109:
  sqrtsd %xmm1,%xmm1
L130:
  addsd  %xmm6,%xmm4
  minsd  %xmm4,%xmm1
  jmp    L46
L20:
  movsd  D4(%rip),%xmm1
  jmp    L109
L27:
  movapd %xmm6,%xmm0
  movsd  %xmm2,0x18(%rsp)
  movsd  %xmm1,0x10(%rsp)
  movsd  %xmm3,0x8(%rsp)
  movsd  %xmm7,(%rsp)
  call   <sqrt@plt>
  movsd  0x18(%rsp),%xmm2
  movsd  0x10(%rsp),%xmm1
  pxor   %xmm5,%xmm5
  movsd  0x8(%rsp),%xmm3
  movsd  (%rsp),%xmm7
  movapd %xmm0,%xmm6
  jmp    L78
L136:
  movapd %xmm3,%xmm0
  movsd  %xmm2,0x10(%rsp)
  movsd  %xmm1,0x8(%rsp)
  movsd  %xmm4,(%rsp)
  call   <sqrt@plt>
  movsd  0x10(%rsp),%xmm2
  movsd  0x8(%rsp),%xmm1
  movsd  (%rsp),%xmm4
  movapd %xmm0,%xmm3
  jmp    L18
L28:
  movapd %xmm4,%xmm0
  movsd  %xmm2,0x20(%rsp)
  movsd  %xmm1,0x18(%rsp)
  movsd  %xmm6,0x10(%rsp)
  movsd  %xmm3,0x8(%rsp)
  movsd  %xmm7,(%rsp)
  call   <sqrt@plt>
  movsd  0x20(%rsp),%xmm2
  movsd  (%rsp),%xmm7
  pxor   %xmm5,%xmm5
  movsd  0x18(%rsp),%xmm1
  movsd  0x10(%rsp),%xmm6
  movapd %xmm0,%xmm4
  movsd  0x8(%rsp),%xmm3
  jmp    L71
L44:
  movapd %xmm1,%xmm0
  movsd  %xmm2,0x18(%rsp)
  movsd  %xmm4,0x10(%rsp)
  movsd  %xmm6,0x8(%rsp)
  movsd  %xmm3,(%rsp)
  call   <sqrt@plt>
  movsd  0x18(%rsp),%xmm2
  movsd  0x10(%rsp),%xmm4
  pxor   %xmm5,%xmm5
  movsd  0x8(%rsp),%xmm6
  movsd  (%rsp),%xmm3
  movapd %xmm0,%xmm1
  jmp    L130
```

tool_calls: name: read_data
arguments: label: D51
data_type: f64
name: read_data
arguments: label: D48
data_type: f64
name: read_data
arguments: label: D42
data_type: f64
name: read_data
arguments: label: D76
data_type: qword[2]
name: read_data
arguments: label: D63
data_type: f32[4]
name: read_data
arguments: label: D16
data_type: f64
name: read_data
arguments: label: D96
data_type: f64
name: read_data
arguments: label: D4
data_type: byte[8]

tool: D51: 1

tool: D48: 2

tool: D42: 3

tool: {"D76": [0x7fffffffffffffff,0x0000000000000000]}

tool: {"D63": [0.0,-0.0,0.0,0.0]}

tool: D16: 2.83

tool: D96: 1.837877

tool: {"D4": [0x88,0x39,0x68,0xb6,0x0c,0xfa,0x8e,0x40]}

assistant: ```c
double xsq_to_stddev(xsq, k, n, approx)
double xsq, k, n;
int *approx;
{
  double stddev, v, wsq, w, a, keff, twologp, u;
  xsq = xsq + k / n;
  v = k - 1.0;
  wsq = xsq - v - v * log(xsq / v);
  if (wsq < 0.0)
    wsq = 0.0;
  w = sqrt(wsq);
  a = sqrt(2.0 / v) / 3.0;
  if (xsq <= v) {
    stddev = -w + a;
  } else {
    keff = k / (1.0 + xsq / n) * (1.0 - exp(-(xsq + n) / k));
    twologp = (2.0 * n - 1.0 - 2.0 * keff) * log(k / keff) - 2.0 * keff + 1.837877;
    if (twologp < 2.83)
      twologp = 1000.0;
    u = sqrt(twologp - log(twologp - 1.837877) - 1.837877);
    stddev = (((u) < (w + a)) ? (u) : (w + a));
  }
  if (fabs(stddev) > n / sqrt(2.0 * v)) {
    *approx = 1;
  } else {
    *approx = 0;
  }
  return (stddev);
}
```