user: Demonstrate the C code that generates the assembly output below:

```asm
<lineClip>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %edi,%ebx
  mov    %rsi,%r12
  mov    %rdx,%r15
  mov    %rcx,%r13
  mov    %r8,0x18(%rsp)
  movsd  %xmm0,(%rsp)
  mov    %r9d,%edi
  mov    %r9d,0xc(%rsp)
  movslq %ebx,%rax
  lea    -0x8(,%rax,8),%rax
  mov    %rax,0x20(%rsp)
  add    %rsi,%rax
  mov    %rax,0x28(%rsp)
  movapd %xmm0,%xmm1
  movsd  (%rax),%xmm0
  call   <inPlane@plt>
  test   %ebx,%ebx
  jle    L8
  mov    %eax,%ebp
  mov    %ebx,%eax
  mov    %rax,0x10(%rsp)
  mov    $0x0,%ebx
  mov    $0x0,%r14d
  jmp    L9
L22:
  test   %ebx,%ebx
  je     L47
  movsd  -0x8(%r15,%rbx,8),%xmm2
  movsd  -0x8(%r12,%rbx,8),%xmm3
  movsd  (%r15,%rbx,8),%xmm0
  subsd  %xmm2,%xmm0
  movsd  (%rsp),%xmm1
  subsd  %xmm3,%xmm1
  mulsd  %xmm1,%xmm0
  movsd  (%r12,%rbx,8),%xmm1
  subsd  %xmm3,%xmm1
  divsd  %xmm1,%xmm0
  addsd  %xmm2,%xmm0
L77:
  movslq %r14d,%rdx
  movsd  (%rsp),%xmm4
  movsd  %xmm4,0x0(%r13,%rdx,8)
  mov    0x18(%rsp),%rsi
  movsd  %xmm0,(%rsi,%rdx,8)
  add    $0x1,%r14d
  mov    %eax,%ebp
L90:
  add    $0x1,%rbx
  cmp    0x10(%rsp),%rbx
  je     L63
L9:
  test   %ebp,%ebp
  je     L44
  movsd  (%r12,%rbx,8),%xmm0
  mov    0xc(%rsp),%edi
  movsd  (%rsp),%xmm1
  call   <inPlane@plt>
  test   %eax,%eax
  je     L22
  movslq %r14d,%rax
  movsd  (%r12,%rbx,8),%xmm0
  movsd  %xmm0,0x0(%r13,%rax,8)
  movsd  (%r15,%rbx,8),%xmm0
  mov    0x18(%rsp),%rsi
  movsd  %xmm0,(%rsi,%rax,8)
  add    $0x1,%r14d
  jmp    L90
L47:
  mov    0x20(%rsp),%rsi
  movsd  (%r15,%rsi,1),%xmm2
  mov    0x28(%rsp),%rsi
  movsd  (%rsi),%xmm3
  movsd  (%r15),%xmm0
  subsd  %xmm2,%xmm0
  movsd  (%rsp),%xmm1
  subsd  %xmm3,%xmm1
  mulsd  %xmm1,%xmm0
  movsd  (%r12),%xmm1
  subsd  %xmm3,%xmm1
  divsd  %xmm1,%xmm0
  addsd  %xmm2,%xmm0
  jmp    L77
L44:
  movsd  (%r12,%rbx,8),%xmm0
  mov    0xc(%rsp),%edi
  movsd  (%rsp),%xmm1
  call   <inPlane@plt>
  mov    %eax,%ebp
  test   %eax,%eax
  je     L90
  test   %ebx,%ebx
  je     L118
  movsd  -0x8(%r15,%rbx,8),%xmm2
  movsd  -0x8(%r12,%rbx,8),%xmm3
  movsd  (%r15,%rbx,8),%xmm0
  subsd  %xmm2,%xmm0
  movsd  (%rsp),%xmm1
  subsd  %xmm3,%xmm1
  mulsd  %xmm1,%xmm0
  movsd  (%r12,%rbx,8),%xmm1
  subsd  %xmm3,%xmm1
  divsd  %xmm1,%xmm0
  addsd  %xmm2,%xmm0
L20:
  movslq %r14d,%rax
  lea    0x0(,%rax,8),%rdx
  movsd  (%rsp),%xmm5
  movsd  %xmm5,0x0(%r13,%rax,8)
  mov    0x18(%rsp),%rcx
  movsd  %xmm0,(%rcx,%rax,8)
  movsd  (%r12,%rbx,8),%xmm0
  movsd  %xmm0,0x8(%r13,%rdx,1)
  movsd  (%r15,%rbx,8),%xmm0
  movsd  %xmm0,0x8(%rcx,%rdx,1)
  add    $0x2,%r14d
  mov    $0x1,%ebp
  jmp    L90
L118:
  mov    0x20(%rsp),%rax
  movsd  (%r15,%rax,1),%xmm2
  mov    0x28(%rsp),%rax
  movsd  (%rax),%xmm3
  movsd  (%r15),%xmm0
  subsd  %xmm2,%xmm0
  movsd  (%rsp),%xmm1
  subsd  %xmm3,%xmm1
  mulsd  %xmm1,%xmm0
  movsd  (%r12,%rbx,8),%xmm1
  subsd  %xmm3,%xmm1
  divsd  %xmm1,%xmm0
  addsd  %xmm2,%xmm0
  jmp    L20
L8:
  mov    $0x0,%r14d
L63:
  mov    %r14d,%eax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
int lineClip(int n, double *x, double *y, double *nx, double *ny, double val, int dir) {
  int i;
  int nout;
  int last;
  double ycross;
  nout = 0;
  last = inPlane(x[n - 1], val, dir);
  for (i = 0; i < n; ++i) {
    if (last) {
      if (inPlane(x[i], val, dir)) {
        nx[nout] = x[i];
        ny[nout] = y[i];
        ++nout;
      } else {
        if (i == 0)
          ycross = y[n - 1] + (y[0] - y[n - 1]) * (val - x[n - 1]) / (x[0] - x[n - 1]);
        else
          ycross = y[i - 1] + (y[i] - y[i - 1]) * (val - x[i - 1]) / (x[i] - x[i - 1]);
        nx[nout] = val;
        ny[nout] = ycross;
        ++nout;
        last = 0;
      }
    } else {
      if (inPlane(x[i], val, dir)) {
        if (i == 0)
          ycross = y[n - 1] + (y[0] - y[n - 1]) * (val - x[n - 1]) / (x[i] - x[n - 1]);
        else
          ycross = y[i - 1] + (y[i] - y[i - 1]) * (val - x[i - 1]) / (x[i] - x[i - 1]);
        nx[nout] = val;
        ny[nout] = ycross;
        ++nout;
        nx[nout] = x[i];
        ny[nout] = y[i];
        ++nout;
        last = 1;
      } else {
      }
    }
  }
  return nout;
}
```