user: 这段汇编代码用C语言表示是什么样的：

```asm
<cdrift_kepu>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x78,%rsp
  movsd  %xmm0,-0x48(%rbp)
  movsd  %xmm1,-0x50(%rbp)
  movsd  %xmm2,-0x58(%rbp)
  movsd  %xmm3,-0x60(%rbp)
  movsd  %xmm4,-0x68(%rbp)
  mov    %rdi,-0x70(%rbp)
  mov    %rsi,-0x78(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  movl   $0x0,-0x3c(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movsd  -0x38(%rbp),%xmm4
  movsd  -0x68(%rbp),%xmm3
  movsd  -0x60(%rbp),%xmm2
  movsd  -0x58(%rbp),%xmm1
  movsd  -0x50(%rbp),%xmm0
  mov    -0x48(%rbp),%rax
  movapd %xmm4,%xmm5
  movapd %xmm3,%xmm4
  movapd %xmm2,%xmm3
  movapd %xmm1,%xmm2
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <cdrift_kepu_guess@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x38(%rbp)
  movsd  -0x38(%rbp),%xmm0
  movsd  %xmm0,-0x30(%rbp)
  mov    -0x78(%rbp),%rdx
  mov    -0x70(%rbp),%rsi
  movsd  -0x68(%rbp),%xmm3
  movsd  -0x60(%rbp),%xmm2
  movsd  -0x58(%rbp),%xmm1
  movsd  -0x50(%rbp),%xmm0
  mov    -0x48(%rbp),%rcx
  lea    -0x38(%rbp),%rax
  movapd %xmm3,%xmm4
  movapd %xmm2,%xmm3
  movapd %xmm1,%xmm2
  movapd %xmm0,%xmm1
  movq   %rcx,%xmm0
  mov    %rax,%rdi
  call   <cdrift_kepu_new@plt>
  mov    %eax,-0x3c(%rbp)
  cmpl   $0x0,-0x3c(%rbp)
  je     L21
  movsd  -0x30(%rbp),%xmm4
  movsd  -0x68(%rbp),%xmm3
  movsd  -0x60(%rbp),%xmm2
  movsd  -0x58(%rbp),%xmm1
  movsd  -0x50(%rbp),%xmm0
  mov    -0x48(%rbp),%rax
  movapd %xmm4,%xmm5
  movapd %xmm3,%xmm4
  movapd %xmm2,%xmm3
  movapd %xmm1,%xmm2
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <cdrift_kepu_fchk@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x28(%rbp)
  movsd  -0x38(%rbp),%xmm4
  movsd  -0x68(%rbp),%xmm3
  movsd  -0x60(%rbp),%xmm2
  movsd  -0x58(%rbp),%xmm1
  movsd  -0x50(%rbp),%xmm0
  mov    -0x48(%rbp),%rax
  movapd %xmm4,%xmm5
  movapd %xmm3,%xmm4
  movapd %xmm2,%xmm3
  movapd %xmm1,%xmm2
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <cdrift_kepu_fchk@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x28(%rbp),%rax
  movq   %rax,%xmm0
  call   <fabs@plt>
  mov    %rax,%rbx
  mov    -0x20(%rbp),%rax
  movq   %rax,%xmm0
  call   <fabs@plt>
  cmp    %rax,%rbx
  jge    L25
  movsd  -0x30(%rbp),%xmm0
  movsd  %xmm0,-0x38(%rbp)
L25:
  mov    -0x78(%rbp),%rdx
  mov    -0x70(%rbp),%rsi
  movsd  -0x68(%rbp),%xmm3
  movsd  -0x60(%rbp),%xmm2
  movsd  -0x58(%rbp),%xmm1
  movsd  -0x50(%rbp),%xmm0
  mov    -0x48(%rbp),%rcx
  lea    -0x38(%rbp),%rax
  movapd %xmm3,%xmm4
  movapd %xmm2,%xmm3
  movapd %xmm1,%xmm2
  movapd %xmm0,%xmm1
  movq   %rcx,%xmm0
  mov    %rax,%rdi
  call   <cdrift_kepu_lag@plt>
  mov    %eax,-0x3c(%rbp)
L21:
  mov    -0x3c(%rbp),%eax
  mov    -0x18(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L17
  call   <__stack_chk_fail@plt>
L17:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

assistant: ```c
int cdrift_kepu(const double dt, const double r0, const double mu, const double alpha, const double u, double *fp, struct cvals *cvals) {
  int iflg = 0;
  double s = 0.0;
  s = cdrift_kepu_guess(dt, r0, mu, alpha, u, s);
  const double st = s;
  iflg = cdrift_kepu_new(&s, dt, r0, mu, alpha, u, fp, cvals);
  if (iflg) {
    const double fo = cdrift_kepu_fchk(dt, r0, mu, alpha, u, st);
    const double fn = cdrift_kepu_fchk(dt, r0, mu, alpha, u, s);
    if (fabs(fo) < fabs(fn)) {
      s = st;
    }
    iflg = cdrift_kepu_lag(&s, dt, r0, mu, alpha, u, fp, cvals);
  }
  return iflg;
}
```