user: Please show me the C implementation that matches the assembly code listed below:

```asm
<miundefined>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  add    $0xffffffffffffff80,%rsp
  mov    %rdi,-0x58(%rbp)
  mov    %rsi,-0x60(%rbp)
  mov    %rdx,-0x68(%rbp)
  mov    %rcx,-0x70(%rbp)
  mov    %r8,-0x78(%rbp)
  mov    %r9d,-0x7c(%rbp)
  mov    0x18(%rbp),%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <calloc@plt>
  mov    %rax,-0x20(%rbp)
  mov    0x18(%rbp),%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <calloc@plt>
  mov    %rax,-0x18(%rbp)
  mov    0x18(%rbp),%eax
  imul   %eax,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <calloc@plt>
  mov    %rax,-0x10(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x28(%rbp)
  mov    -0x10(%rbp),%r9
  mov    -0x78(%rbp),%r8
  mov    -0x70(%rbp),%rcx
  mov    -0x68(%rbp),%rdx
  mov    -0x60(%rbp),%rsi
  mov    -0x58(%rbp),%rax
  sub    $0x8,%rsp
  mov    0x18(%rbp),%edi
  push   %rdi
  mov    0x10(%rbp),%edi
  push   %rdi
  mov    -0x7c(%rbp),%edi
  push   %rdi
  push   -0x18(%rbp)
  push   -0x20(%rbp)
  mov    %rax,%rdi
  call   <histU@plt>
  add    $0x30,%rsp
  movl   $0x0,-0x44(%rbp)
  jmp    L3
L36:
  mov    -0x44(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x8(%rbp)
  movsd  -0x8(%rbp),%xmm0
  pxor   %xmm1,%xmm1
  comisd %xmm1,%xmm0
  jbe    L88
  mov    -0x8(%rbp),%rax
  movq   %rax,%xmm0
  call   <log2d@plt>
  movq   %xmm0,%rax
  movq   %rax,%xmm1
  mulsd  -0x8(%rbp),%xmm1
  movsd  -0x38(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
L88:
  mov    -0x44(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x8(%rbp)
  movsd  -0x8(%rbp),%xmm0
  pxor   %xmm1,%xmm1
  comisd %xmm1,%xmm0
  jbe    L78
  mov    -0x8(%rbp),%rax
  movq   %rax,%xmm0
  call   <log2d@plt>
  movq   %xmm0,%rax
  movq   %rax,%xmm1
  mulsd  -0x8(%rbp),%xmm1
  movsd  -0x30(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
L78:
  addl   $0x1,-0x44(%rbp)
L3:
  mov    -0x44(%rbp),%eax
  cmp    0x18(%rbp),%eax
  jl     L36
  movl   $0x0,-0x40(%rbp)
  jmp    L29
L15:
  movl   $0x0,-0x3c(%rbp)
  jmp    L85
L30:
  mov    -0x40(%rbp),%eax
  imul   0x18(%rbp),%eax
  mov    %eax,%edx
  mov    -0x3c(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x8(%rbp)
  movsd  -0x8(%rbp),%xmm0
  pxor   %xmm1,%xmm1
  comisd %xmm1,%xmm0
  jbe    L77
  mov    -0x8(%rbp),%rax
  movq   %rax,%xmm0
  call   <log2d@plt>
  movq   %xmm0,%rax
  movq   %rax,%xmm1
  mulsd  -0x8(%rbp),%xmm1
  movsd  -0x28(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x28(%rbp)
L77:
  addl   $0x1,-0x3c(%rbp)
L85:
  mov    -0x3c(%rbp),%eax
  cmp    0x18(%rbp),%eax
  jl     L30
  addl   $0x1,-0x40(%rbp)
L29:
  mov    -0x40(%rbp),%eax
  cmp    0x18(%rbp),%eax
  jl     L15
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  movsd  -0x38(%rbp),%xmm0
  addsd  -0x30(%rbp),%xmm0
  subsd  -0x28(%rbp),%xmm0
  movq   %xmm0,%rax
  movq   %rax,%xmm0
  leave
  ret
```

assistant: ```c
double miundefined(const double *x, const double *y, const int *knots, const double *wx, const double *wy, int numSamples, int splineOrder, int numBins) {
  int curBin, curBinX, curBinY;
  double *h1 = (double *)calloc(numBins, sizeof(double));
  double *h2 = (double *)calloc(numBins, sizeof(double));
  double *h12 = (double *)calloc(numBins * numBins, sizeof(double));
  double e1 = 0;
  double e2 = 0;
  double e12 = 0;
  double p;
  histU(x, y, knots, wx, wy, h12, h1, h2, numSamples, splineOrder, numBins);
  for (curBin = 0; curBin < numBins; curBin++) {
    p = h1[curBin];
    if (p > 0)
      e1 -= p * log2d(p);
    p = h2[curBin];
    if (p > 0)
      e2 -= p * log2d(p);
  }
  for (curBinX = 0; curBinX < numBins; curBinX++)
    for (curBinY = 0; curBinY < numBins; curBinY++) {
      p = h12[curBinX * numBins + curBinY];
      if (p > 0)
        e12 -= p * log2d(p);
    }
  free(h12);
  free(h1);
  free(h2);
  return e1 + e2 - e12;
}
```