user: 这段汇编代码用C语言表示是什么样的:

```asm
<cotd>:
  endbr64
  fldl   0xefd(%rip)        # 2000 <_fini+0xd9c>
  fldt   0x8(%rsp)
  fcomi  %st(1),%st
  fstp   %st(1)
  ja     L8
  fldl   0xef1(%rip)        # 2008 <_fini+0xda4>
  fcomip %st(1),%st
  ja     L51
  fldz
  fxch   %st(1)
  fucomi %st(1),%st
  fstp   %st(1)
  jp     L81
  je     L42
L81:
  fnstcw -0xa(%rsp)
  movzwl -0xa(%rsp),%eax
  or     $0xc,%ah
  mov    %ax,-0xc(%rsp)
  fld    %st(0)
  fldcw  -0xc(%rsp)
  fistpll -0x28(%rsp)
  fldcw  -0xa(%rsp)
  fildll -0x28(%rsp)
  fld    %st(1)
  fsub   %st(1),%st
  fldz
  fxch   %st(3)
  fcomi  %st(3),%st
  fstp   %st(3)
  jbe    L46
  fldt   0xeb6(%rip)        # 2020 <_fini+0xdbc>
  fmulp  %st,%st(3)
  fxch   %st(2)
  fadds  0xf4c(%rip)        # 20c0 <_fini+0xe5c>
  fldcw  -0xc(%rsp)
  fistpll -0x28(%rsp)
  fldcw  -0xa(%rsp)
L48:
  fildll -0x28(%rsp)
  fld    %st(0)
  fmuls  0xf38(%rip)        # 20c4 <_fini+0xe60>
  fsubrp %st,%st(2)
  fxch   %st(1)
  faddp  %st,%st(2)
  fld    %st(0)
  fmull  0xe76(%rip)        # 2010 <_fini+0xdac>
  faddp  %st,%st(2)
  fldt   0xe8e(%rip)        # 2030 <_fini+0xdcc>
  fmulp  %st,%st(1)
  fsubrp %st,%st(1)
  fld    %st(0)
  fchs
  fldz
  fcomip %st(2),%st
  fcmovbe %st(1),%st
  fldt   0xe8a(%rip)        # 2040 <_fini+0xddc>
  fcomip %st(1),%st
  fstp   %st(0)
  ja     L35
  fld    %st(0)
  fmul   %st(1),%st
  fldt   0xe86(%rip)        # 2050 <_fini+0xdec>
  fmul   %st(1),%st
  fldt   0xe8e(%rip)        # 2060 <_fini+0xdfc>
  faddp  %st,%st(1)
  fmul   %st(1),%st
  fldt   0xe94(%rip)        # 2070 <_fini+0xe0c>
  fsubrp %st,%st(1)
  fmul   %st(1),%st
  fmul   %st(2),%st
  faddp  %st,%st(2)
  fldt   0xe96(%rip)        # 2080 <_fini+0xe1c>
  fmul   %st(1),%st
  fldt   0xe9e(%rip)        # 2090 <_fini+0xe2c>
  fsubrp %st,%st(1)
  fmul   %st(1),%st
  fldt   0xea4(%rip)        # 20a0 <_fini+0xe3c>
  faddp  %st,%st(1)
  fmul   %st(1),%st
  fldt   0xeaa(%rip)        # 20b0 <_fini+0xe4c>
  fsubrp %st,%st(1)
  fmulp  %st,%st(1)
  fld1
  faddp  %st,%st(1)
  testb  $0x1,-0x28(%rsp)
  je     L73
  fxch   %st(1)
  fchs
  fstpt  -0x28(%rsp)
  fldt   -0x28(%rsp)
L73:
  fdivp  %st,%st(1)
  ret
L46:
  fldt   0xdf6(%rip)        # 2020 <_fini+0xdbc>
  fmulp  %st,%st(3)
  fxch   %st(2)
  fsubs  0xe8c(%rip)        # 20c0 <_fini+0xe5c>
  fldcw  -0xc(%rsp)
  fistpll -0x28(%rsp)
  fldcw  -0xa(%rsp)
  jmp    L48
L35:
  testb  $0x1,-0x28(%rsp)
  je     L1
  fchs
  ret
L1:
  fld1
  fdivp  %st,%st(1)
  ret
L8:
  fstp   %st(0)
  fldz
  ret
L51:
  fstp   %st(0)
  fldz
  ret
L42:
  fstp   %st(0)
  fldz
  ret
```

assistant: ```c
long double cotd(long double x) {
  long int n;
  long double xn;
  long double f, g;
  long double x_int, x_fract;
  long double result;
  long double xnum, xden;
  if ((x > ((421657424.0L))) || (x < -((421657424.0L))) || (x == 0.0L)) {
    return 0.0L;
  }
  x_int = ((long double)(((long)(x))));
  x_fract = ((long double)(x) - (long double)(x_int));
  if (x > 0.0) {
    n = ((long)(((long double)(((long double)(x) * (long double)((0.63661977236758134307553505349006L)))) + (long double)(0.5))));
  } else {
    n = ((long)(((long double)(((long double)(x) * (long double)((0.63661977236758134307553505349006L)))) + (long double)(-0.5))));
  }
  xn = ((long double)(n));
  f = ((long double)(x_int) - (long double)(((long double)(xn) * (long double)((1.57080078125L)))));
  f = ((long double)(f) + (long double)(x_fract));
  f = ((long double)(f) - (long double)(((long double)(xn) * (long double)((-4.45445516561449039727449417114e-6L)))));
  f = ((long double)(f) - (long double)(((long double)(xn) * (long double)((6.2233721718966133922584676705e-14L)))));
  if (f < 0.0L) {
    g = -f;
  } else {
    g = f;
  }
  if (g < (+1.490116119385e-8L)) {
    if (n & 0x0001) {
      result = -f;
    } else {
      result = ((long double)(1.0L) / (long double)(f));
    }
    return result;
  }
  g = ((long double)(f) * (long double)(f));
  xnum = ((long double)(g) * (long double)((-1.7861707342254424711e-5L)));
  xnum = ((long double)(xnum) + (long double)((+3.4248878235890589960e-3L)));
  xnum = ((long double)(xnum) * (long double)(g));
  xnum = ((long double)(xnum) + (long double)((-1.3338350006421960681e-1L)));
  xnum = ((long double)(xnum) * (long double)(g));
  xnum = ((long double)(xnum) * (long double)(f));
  xnum = ((long double)(xnum) + (long double)(f));
  xden = ((long double)(g) * (long double)((+4.9819433993786512270e-7L)));
  xden = ((long double)(xden) + (long double)((-3.1181531907010027307e-4L)));
  xden = ((long double)(xden) * (long double)(g));
  xden = ((long double)(xden) + (long double)((+2.5663832289440112864e-2L)));
  xden = ((long double)(xden) * (long double)(g));
  xden = ((long double)(xden) + (long double)((-4.6671683339755294240e-1L)));
  xden = ((long double)(xden) * (long double)(g));
  xden = ((long double)(xden) + (long double)((+1.0000000000000000000L)));
  if (n & 0x0001) {
    xnum = -xnum;
  } else {
    result = xden;
    xden = xnum;
    xnum = result;
  }
  result = ((long double)(xnum) / (long double)(xden));
  return result;
}
```