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

```asm
<polygon_triangulate>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x88,%rsp
  mov    %edi,0x10(%rsp)
  mov    %rdx,0x48(%rsp)
  mov    %fs:0x28,%rax
  mov    %rax,0x78(%rsp)
  xor    %eax,%eax
  cmp    $0x2,%edi
  jle    L32
  mov    %rsi,%r15
  test   %r15,%r15
  je     L87
  test   %rdx,%rdx
  je     L185
  lea    (%rdi,%rdi,1),%ecx
  movslq %ecx,%rax
  lea    -0x18(%rdx,%rax,4),%r14
  mov    %edi,%edx
  mov    $0x0,%eax
L224:
  mov    %eax,(%r14,%rax,4)
  add    $0x1,%rax
  cmp    %rdx,%rax
  jne    L224
  mov    0x10(%rsp),%eax
  sub    $0x1,%eax
  mov    %eax,0x14(%rsp)
  lea    -0x1(%rcx),%eax
  mov    %eax,0x40(%rsp)
  movl   $0x0,0x44(%rsp)
  lea    0x60(%rsp),%rax
  mov    %rax,0x18(%rsp)
  lea    0x50(%rsp),%rax
  mov    %rax,0x20(%rsp)
  mov    %r14,%r13
  jmp    L91
L227:
  mov    0x40(%rsp),%eax
  mov    %ebp,0x14(%rsp)
L68:
  cmpl   $0x2,0x10(%rsp)
  jle    L77
  lea    -0x1(%rax),%esi
  mov    %esi,0x40(%rsp)
  test   %eax,%eax
  jle    L39
L91:
  mov    0x14(%rsp),%ecx
  lea    0x1(%rcx),%ebp
  mov    0x10(%rsp),%eax
  cmp    %eax,%ebp
  mov    $0x0,%esi
  cmovge %esi,%ebp
  lea    0x1(%rbp),%r12d
  cmp    %eax,%r12d
  cmovge %esi,%r12d
  movslq %ebp,%rax
  shl    $0x2,%rax
  mov    %rax,0x38(%rsp)
  add    %r13,%rax
  mov    %rax,0x28(%rsp)
  mov    (%rax),%eax
  add    %eax,%eax
  cltq
  lea    (%r15,%rax,8),%rsi
  movslq %ecx,%rdx
  lea    0x0(%r13,%rdx,4),%r14
  mov    (%r14),%edi
  lea    (%rdi,%rdi,1),%edx
  movslq %edx,%rdx
  lea    (%r15,%rdx,8),%rdi
  movsd  (%rdi),%xmm2
  movsd  (%rsi),%xmm0
  subsd  %xmm2,%xmm0
  movsd  %xmm0,0x50(%rsp)
  movsd  0x8(%r15,%rdx,8),%xmm1
  movsd  0x8(%r15,%rax,8),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,0x58(%rsp)
  movslq %r12d,%rax
  lea    0x0(%r13,%rax,4),%rax
  mov    %rax,0x30(%rsp)
  mov    (%rax),%eax
  mov    %eax,(%rsp)
  add    %eax,%eax
  cltq
  lea    (%r15,%rax,8),%rdx
  movsd  (%rdx),%xmm0
  subsd  %xmm2,%xmm0
  movsd  %xmm0,0x60(%rsp)
  movsd  0x8(%r15,%rax,8),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,0x68(%rsp)
  call   <LeftTurn@plt>
  test   %rax,%rax
  js     L227
  mov    0x10(%rsp),%eax
  mov    %eax,%edi
  mov    %rdi,(%rsp)
  mov    $0x0,%ebx
  test   %eax,%eax
  jle    L75
  mov    %r12d,0xc(%rsp)
  mov    0x14(%rsp),%r12d
  jmp    L180
L178:
  add    $0x1,%rbx
  cmp    (%rsp),%rbx
  je     L75
L180:
  cmp    %r12d,%ebx
  sete   %al
  cmp    %ebx,%ebp
  sete   %dl
  or     %dl,%al
  jne    L178
  cmp    %ebx,0xc(%rsp)
  je     L178
  mov    0x0(%r13,%rbx,4),%eax
  add    %eax,%eax
  cltq
  lea    (%r15,%rax,8),%rcx
  mov    (%r14),%eax
  add    %eax,%eax
  cltq
  lea    (%r15,%rax,8),%rdi
  mov    0x18(%rsp),%rdx
  mov    0x20(%rsp),%rsi
  call   <TriangleContainsPoint@plt>
  test   %rax,%rax
  je     L178
  mov    0x40(%rsp),%eax
  mov    %ebp,0x14(%rsp)
  jmp    L68
L77:
  mov    $0x0,%eax
L160:
  mov    0x78(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L21
  add    $0x88,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L32:
  mov    $0xffffffff,%eax
  jmp    L160
L87:
  mov    $0xfffffffe,%eax
  jmp    L160
L185:
  mov    $0xfffffffd,%eax
  jmp    L160
L39:
  mov    $0x1,%eax
  jmp    L160
L75:
  mov    (%r14),%r8d
  mov    0x28(%rsp),%rax
  mov    (%rax),%esi
  mov    0x30(%rsp),%rax
  mov    (%rax),%edi
  test   %ebp,%ebp
  jle    L219
  mov    0x28(%rsp),%rax
  mov    0x38(%rsp),%rcx
  lea    -0x4(%r13,%rcx,1),%rcx
  lea    -0x1(%rbp),%edx
  shl    $0x2,%rdx
  sub    %rdx,%rcx
L70:
  mov    -0x4(%rax),%edx
  mov    %edx,(%rax)
  sub    $0x4,%rax
  cmp    %rcx,%rax
  jne    L70
  movl   $0x0,0x14(%rsp)
L177:
  add    $0x4,%r13
  subl   $0x1,0x10(%rsp)
  mov    0x10(%rsp),%eax
  add    %eax,%eax
  mov    0x44(%rsp),%ecx
  lea    (%rcx,%rcx,2),%edx
  movslq %edx,%rdx
  mov    0x48(%rsp),%rbx
  mov    %r8d,(%rbx,%rdx,4)
  add    $0x1,%rdx
  mov    %esi,(%rbx,%rdx,4)
  mov    %edi,0x4(%rbx,%rdx,4)
  add    $0x1,%ecx
  mov    %ecx,0x44(%rsp)
  jmp    L68
L219:
  mov    %ebp,0x14(%rsp)
  jmp    L177
L21:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int polygon_triangulate(int n, const double *v, int *t) {
  int *V;
  int nv;
  int i;
  int count;
  int tc = 0;
  if (n < 3) {
    return -1;
  }
  if (NULL == v) {
    return -2;
  }
  if (NULL == t) {
    return -3;
  }
  V = t + 2 * n - 6;
  nv = n;
  for (i = 0; i < n; ++i) {
    V[i] = i;
  }
  count = 2 * nv;
  for (i = nv - 1; nv > 2;) {
    int u, w;
    if (0 >= (count--)) {
      return 1;
    }
    u = i;
    i = u + 1;
    if (nv <= i) {
      i = 0;
    }
    w = i + 1;
    if (nv <= w) {
      w = 0;
    }
    int can_clip = 1;
    {
      int p;
      double tri_a[2] = {v[2 * V[i] + 0] - v[2 * V[u] + 0], v[2 * V[i] + 1] - v[2 * V[u] + 1]};
      double tri_b[2] = {v[2 * V[w] + 0] - v[2 * V[u] + 0], v[2 * V[w] + 1] - v[2 * V[u] + 1]};
      if (LeftTurn(&v[2 * V[u]], &v[2 * V[i]], &v[2 * V[w]]) < 0) {
        can_clip = 0;
      } else {
        for (p = 0; p < nv; ++p) {
          if ((p == u) || (p == i) || (p == w)) {
            continue;
          }
          if (TriangleContainsPoint(&v[2 * V[u]], tri_a, tri_b, &v[2 * V[p]])) {
            can_clip = 0;
            break;
          }
        }
      }
    }
    if (can_clip) {
      int tri[3] = {V[u], V[i], V[w]};
      while (i > 0) {
        V[i] = V[i - 1];
        --i;
      }
      ++V;
      --nv;
      count = 2 * nv;
      t[3 * tc + 0] = tri[0];
      t[3 * tc + 1] = tri[1];
      t[3 * tc + 2] = tri[2];
      ++tc;
    }
  }
  return 0;
}
```