user: Converte this assembly snippet into its equivalent C code:

```asm
<spline_construct>:
  endbr64
  push   %r15
  mov    %ecx,%r9d
  sub    $0x1,%ecx
  mov    %rdx,%r15
  push   %r14
  push   %r13
  push   %r12
  lea    0x0(,%rcx,8),%r12d
  push   %rbp
  push   %rbx
  mov    %rsi,%rbx
  sub    $0x28,%rsp
  mov    %rdi,0x18(%rsp)
  mov    %r12d,%edi
  mov    %r9d,0x10(%rsp)
  mov    %ecx,0x14(%rsp)
  call   <malloc@plt>
  movslq 0x10(%rsp),%rsi
  mov    %rax,%r13
  lea    0x0(,%rsi,8),%ebp
  mov    %rsi,0x8(%rsp)
  mov    %ebp,%edi
  call   <malloc@plt>
  mov    %r12d,%edi
  mov    %rax,%r14
  call   <malloc@plt>
  mov    %ebp,%edi
  mov    %rax,%r12
  call   <malloc@plt>
  mov    0x18(%rsp),%r8
  mov    0x14(%rsp),%ecx
  movsd  D2(%rip),%xmm3
  mov    0x10(%rsp),%r9d
  mov    %rax,%rbp
  movsd  0x8(%r8),%xmm0
  subsd  (%r8),%xmm0
  cmp    $0x1,%ecx
  mov    0x8(%rsp),%rsi
  addsd  %xmm0,%xmm0
  movsd  %xmm0,(%r14)
  movsd  0x8(%r8),%xmm0
  subsd  (%r8),%xmm0
  movsd  %xmm0,(%r12)
  movsd  0x8(%rbx),%xmm0
  subsd  (%rbx),%xmm0
  mulsd  %xmm3,%xmm0
  movsd  %xmm0,(%rax)
  jle    L74
  lea    -0x3(%r9),%edi
  mov    %r8,%rdx
  mov    $0x1,%eax
  add    $0x2,%rdi
  nopl   (%rax)
L61:
  movsd  0x8(%rdx),%xmm0
  subsd  (%rdx),%xmm0
  add    $0x8,%rdx
  movsd  %xmm0,-0x8(%r13,%rax,8)
  movsd  (%rdx),%xmm2
  movsd  0x8(%rdx),%xmm1
  movapd %xmm2,%xmm0
  subsd  %xmm2,%xmm1
  subsd  -0x8(%rdx),%xmm0
  addsd  %xmm1,%xmm1
  addsd  %xmm0,%xmm0
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%r14,%rax,8)
  movsd  0x8(%rdx),%xmm0
  subsd  (%rdx),%xmm0
  movsd  %xmm0,(%r12,%rax,8)
  movsd  0x8(%rbx,%rax,8),%xmm0
  subsd  -0x8(%rbx,%rax,8),%xmm0
  mulsd  %xmm3,%xmm0
  movsd  %xmm0,0x0(%rbp,%rax,8)
  add    $0x1,%rax
  cmp    %rax,%rdi
  jne    L61
L74:
  lea    0x0(,%rsi,8),%rax
  lea    -0x8(%rax),%rdx
  lea    -0x10(%r8,%rax,1),%rdi
  lea    (%r8,%rdx,1),%r10
  lea    (%r15,%rdx,1),%r8
  movsd  (%r10),%xmm0
  subsd  (%rdi),%xmm0
  movsd  %xmm0,-0x10(%r13,%rax,1)
  movsd  (%r10),%xmm0
  subsd  (%rdi),%xmm0
  lea    0x0(%rbp,%rdx,1),%rdi
  lea    -0x2(%r9),%edx
  addsd  %xmm0,%xmm0
  movsd  %xmm0,-0x8(%r14,%rax,1)
  movsd  -0x8(%rbx,%rax,1),%xmm0
  subsd  -0x10(%rbx,%rax,1),%xmm0
  mov    $0x1,%eax
  mulsd  %xmm3,%xmm0
  movsd  D6(%rip),%xmm3
  movsd  %xmm0,(%rdi)
  movsd  (%r12),%xmm0
  divsd  (%r14),%xmm0
  movsd  %xmm0,(%r12)
  movsd  0x0(%rbp),%xmm0
  divsd  (%r14),%xmm0
  movsd  %xmm0,0x0(%rbp)
  cmp    $0x1,%r9d
  jle    L1
  nopl   0x0(%rax,%rax,1)
L39:
  movsd  -0x8(%r13,%rax,8),%xmm0
  movsd  -0x8(%r12,%rax,8),%xmm2
  movsd  (%r14,%rax,8),%xmm1
  mulsd  %xmm0,%xmm2
  subsd  %xmm2,%xmm1
  movapd %xmm3,%xmm2
  divsd  %xmm1,%xmm2
  cmp    %eax,%ecx
  jle    L71
  movsd  (%r12,%rax,8),%xmm0
  mulsd  %xmm2,%xmm0
  movsd  %xmm0,(%r12,%rax,8)
  movsd  -0x8(%r13,%rax,8),%xmm0
L71:
  movsd  -0x8(%rbp,%rax,8),%xmm1
  mulsd  %xmm0,%xmm1
  movsd  0x0(%rbp,%rax,8),%xmm0
  subsd  %xmm1,%xmm0
  mulsd  %xmm2,%xmm0
  movsd  %xmm0,0x0(%rbp,%rax,8)
  add    $0x1,%rax
  cmp    %rax,%rsi
  jne    L39
  movsd  (%rdi),%xmm0
  movsd  %xmm0,(%r8)
L34:
  movslq %edx,%rax
  nopw   0x0(%rax,%rax,1)
L20:
  movsd  (%r12,%rax,8),%xmm1
  mulsd  0x8(%r15,%rax,8),%xmm1
  movsd  0x0(%rbp,%rax,8),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,(%r15,%rax,8)
  sub    $0x1,%rax
  test   %eax,%eax
  jns    L20
L37:
  mov    %r13,%rdi
  call   <free@plt>
  mov    %r14,%rdi
  call   <free@plt>
  mov    %r12,%rdi
  call   <free@plt>
  add    $0x28,%rsp
  mov    %rbp,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1060 <free@plt>
  nopl   0x0(%rax,%rax,1)
L1:
  movsd  (%rdi),%xmm0
  movsd  %xmm0,(%r8)
  test   %edx,%edx
  js     L37
  jmp    L34
```

tool_calls: name: parse_data
arguments: data_label: D2
type: byte[8]
name: parse_data
arguments: data_label: D6
type: f64

tool: {"D2": [0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x40]}

tool: D6: 1

assistant: ```c
void spline_construct(double *x, double *y, double *d, int n) {
  int i;
  double tmp;
  double *diag_low;
  double *diag_mid;
  double *diag_up;
  double *right;
  diag_low = malloc((n - 1) * sizeof(double));
  diag_mid = malloc(n * sizeof(double));
  diag_up = malloc((n - 1) * sizeof(double));
  right = malloc(n * sizeof(double));
  diag_mid[0] = 2 * (x[1] - x[0]);
  diag_up[0] = (x[1] - x[0]);
  right[0] = 3 * (y[1] - y[0]);
  for (i = 1; i < n - 1; i++) {
    diag_low[i - 1] = (x[i] - x[i - 1]);
    diag_mid[i] = 2 * (x[i] - x[i - 1]) + 2 * (x[i + 1] - x[i]);
    diag_up[i] = (x[i + 1] - x[i]);
    right[i] = 3 * (y[i + 1] - y[i - 1]);
  }
  diag_low[n - 2] = (x[n - 1] - x[n - 2]);
  diag_mid[n - 1] = 2 * (x[n - 1] - x[n - 2]);
  right[n - 1] = 3 * (y[n - 1] - y[n - 2]);
  diag_up[0] /= diag_mid[0];
  right[0] /= diag_mid[0];
  for (i = 1; i < n; i++) {
    tmp = 1.0 / (diag_mid[i] - diag_up[i - 1] * diag_low[i - 1]);
    if (i < n - 1)
      diag_up[i] *= tmp;
    right[i] = (right[i] - right[i - 1] * diag_low[i - 1]) * tmp;
  }
  d[n - 1] = right[n - 1];
  for (i = n - 2; i >= 0; i--) {
    d[i] = right[i] - diag_up[i] * d[i + 1];
  }
  free(diag_low);
  free(diag_mid);
  free(diag_up);
  free(right);
}
```