user: 请从给定的汇编指令推导出C源代码:

```asm
<xLarge_x>:
  endbr64
  push   %rbx
  sub    $0x40,%rsp
  fnstcw 0x3e(%rsp)
  fldt   0x50(%rsp)
  fldt   0x60(%rsp)
  movzwl 0x3e(%rsp),%eax
  or     $0xc,%ah
  fld1
  mov    %ax,0x3c(%rsp)
  fld    %st(0)
  fdiv   %st(2),%st
  fld    %st(3)
  fsub   %st(3),%st
  fsubp  %st,%st(2)
  fxch   %st(1)
  fldcw  0x3c(%rsp)
  fistpl (%rsp)
  fldcw  0x3e(%rsp)
  mov    (%rsp),%ecx
  lea    0x1(%rcx),%ebx
  fld    %st(0)
  cmp    $0x1,%ebx
  jle    L7
  mov    $0x1,%eax
  nopl   (%rax)
L39:
  mov    %eax,(%rsp)
  fildl  (%rsp)
  mov    %eax,%edx
  add    $0x1,%eax
  fadd   %st(3),%st
  fdivr  %st(4),%st
  fmulp  %st,%st(2)
  fadd   %st(1),%st
  cmp    %edx,%ecx
  jne    L39
  fstp   %st(1)
  fxch   %st(1)
  jmp    L1
  nopl   (%rax)
L7:
  fstp   %st(1)
  fxch   %st(1)
  nopl   0x0(%rax)
L1:
  fstpt  0x60(%rsp)
  fxch   %st(1)
  xor    %eax,%eax
  fstpt  0x50(%rsp)
  fstpt  (%rsp)
  call   <Gamma_Function_Max_Arg@plt>
  fldt   0x60(%rsp)
  fxch   %st(1)
  fcomip %st(1),%st
  fldt   (%rsp)
  fldt   0x50(%rsp)
  jb     L5
  fxch   %st(1)
  fstpt  0x20(%rsp)
  fxch   %st(1)
  sub    $0x20,%rsp
  fstpt  0x10(%rsp)
  fld    %st(0)
  fstpt  (%rsp)
  fstpt  0x70(%rsp)
  call   <powl@plt>
  fstpt  0x20(%rsp)
  pop    %rcx
  pop    %rsi
  fldt   0x60(%rsp)
  fchs
  fstpt  (%rsp)
  call   <expl@plt>
  fldt   0x10(%rsp)
  sub    $0x10,%rsp
  fmulp  %st,%st(1)
  fstpt  0x20(%rsp)
  fldt   0x80(%rsp)
  fld    %st(0)
  fstpt  (%rsp)
  fstpt  0x80(%rsp)
  call   <xGamma_Function@plt>
  fldt   0x20(%rsp)
  mov    %ebx,0x20(%rsp)
  fdivp  %st,%st(1)
  fstpt  0x30(%rsp)
  fildl  0x20(%rsp)
  fldt   0x80(%rsp)
  faddp  %st,%st(1)
  fstpt  0x10(%rsp)
  fldt   0x70(%rsp)
  fstpt  (%rsp)
  call   <xMedium_x@plt>
  fldt   0x30(%rsp)
  fldt   0x40(%rsp)
  add    $0x20,%rsp
  add    $0x40,%rsp
  pop    %rbx
  fmulp  %st,%st(1)
  faddp  %st,%st(1)
  ret
  nopw   0x0(%rax,%rax,1)
L5:
  fxch   %st(2)
  fstpt  0x60(%rsp)
  fxch   %st(1)
  sub    $0x10,%rsp
  fstpt  0x60(%rsp)
  fstpt  (%rsp)
  call   <logl@plt>
  sub    $0x10,%rsp
  fstpt  0x20(%rsp)
  fldt   0x70(%rsp)
  fld    %st(0)
  fstpt  (%rsp)
  fstpt  0x70(%rsp)
  call   <logl@plt>
  fldt   0x80(%rsp)
  fmul   %st,%st(1)
  fldt   0x20(%rsp)
  faddp  %st,%st(2)
  fldt   0x70(%rsp)
  fsubrp %st,%st(2)
  fxch   %st(1)
  fstpt  0x20(%rsp)
  pop    %rax
  pop    %rdx
  fstpt  (%rsp)
  call   <xLn_Gamma_Function@plt>
  fldt   0x10(%rsp)
  sub    $0x10,%rsp
  fsubp  %st,%st(1)
  fstpt  (%rsp)
  call   <expl@plt>
  mov    %ebx,0x20(%rsp)
  fstpt  0x30(%rsp)
  fildl  0x20(%rsp)
  fldt   0x80(%rsp)
  faddp  %st,%st(1)
  fstpt  0x10(%rsp)
  fldt   0x70(%rsp)
  fstpt  (%rsp)
  call   <xMedium_x@plt>
  fldt   0x30(%rsp)
  add    $0x20,%rsp
  add    $0x40,%rsp
  pop    %rbx
  faddp  %st,%st(1)
  ret
```

assistant: ```c
long double xLarge_x(long double x, long double nu) {
  long double temp = 1.0L / nu;
  long double sum = temp;
  long double coef;
  int i = 0;
  int n;
  n = (int)(x - nu - 1.0L) + 1;
  for (i = 1; i < n; i++) {
    temp *= x / (nu + i);
    sum += temp;
  }
  if (nu <= Gamma_Function_Max_Arg()) {
    coef = powl(x, nu) * expl(-x) / xGamma_Function(nu);
    return xMedium_x(x, nu + n) + coef * sum;
  } else {
    return expl(logl(sum) + nu * logl(x) - x - xLn_Gamma_Function(nu)) + xMedium_x(x, nu + n);
  }
}
```