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

```asm
<highbd_transpose4x8_8x4_sse2>:
  endbr64
  push   %r15
  xor    %eax,%eax
  mov    %rsi,%r15
  push   %r14
  push   %r13
  mov    %rcx,%r13
  push   %r12
  mov    %rdx,%r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x28,%rsp
  mov    %r9,0x10(%rsp)
  mov    %r8,0x18(%rsp)
  call   <_mm_setzero_si128@plt>
  mov    (%r15),%esi
  mov    (%rbx),%edi
  mov    %rbx,(%rsp)
  mov    %eax,%ebp
  call   <_mm_unpacklo_epi16@plt>
  mov    0x0(%r13),%esi
  mov    (%r12),%edi
  mov    %eax,%r14d
  call   <_mm_unpacklo_epi16@plt>
  mov    %r14d,%edi
  mov    %eax,%esi
  mov    %eax,0xc(%rsp)
  call   <_mm_unpacklo_epi32@plt>
  mov    0xc(%rsp),%esi
  mov    %r14d,%edi
  mov    %eax,%ebx
  call   <_mm_unpackhi_epi32@plt>
  mov    (%r15),%esi
  mov    %eax,%r14d
  mov    (%rsp),%rax
  mov    (%rax),%edi
  call   <_mm_unpackhi_epi16@plt>
  mov    0x0(%r13),%esi
  mov    (%r12),%edi
  mov    %eax,%r15d
  call   <_mm_unpackhi_epi16@plt>
  mov    %r15d,%edi
  mov    %eax,%r12d
  mov    %eax,%esi
  call   <_mm_unpacklo_epi32@plt>
  mov    %r12d,%esi
  mov    %r15d,%edi
  mov    %eax,%r13d
  call   <_mm_unpackhi_epi32@plt>
  mov    %ebp,%esi
  mov    %ebx,%edi
  mov    %eax,%r12d
  call   <_mm_unpacklo_epi64@plt>
  mov    0x18(%rsp),%r8
  mov    %ebp,%esi
  mov    %ebx,%edi
  mov    %eax,(%r8)
  call   <_mm_unpackhi_epi64@plt>
  mov    0x10(%rsp),%r9
  mov    %ebp,%esi
  mov    %r14d,%edi
  mov    %eax,(%r9)
  call   <_mm_unpacklo_epi64@plt>
  mov    0x60(%rsp),%rdx
  mov    %ebp,%esi
  mov    %r14d,%edi
  mov    %eax,(%rdx)
  call   <_mm_unpackhi_epi64@plt>
  mov    0x68(%rsp),%rdx
  mov    %ebp,%esi
  mov    %r13d,%edi
  mov    %eax,(%rdx)
  call   <_mm_unpacklo_epi64@plt>
  mov    0x70(%rsp),%rdx
  mov    %ebp,%esi
  mov    %r13d,%edi
  mov    %eax,(%rdx)
  call   <_mm_unpackhi_epi64@plt>
  mov    0x78(%rsp),%rdx
  mov    %ebp,%esi
  mov    %r12d,%edi
  mov    %eax,(%rdx)
  call   <_mm_unpacklo_epi64@plt>
  mov    0x80(%rsp),%rdx
  mov    %ebp,%esi
  mov    %r12d,%edi
  mov    %eax,(%rdx)
  call   <_mm_unpackhi_epi64@plt>
  mov    0x88(%rsp),%rdx
  mov    %eax,(%rdx)
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void highbd_transpose4x8_8x4_sse2(__m128i *x0, __m128i *x1, __m128i *x2, __m128i *x3, __m128i *d0, __m128i *d1, __m128i *d2, __m128i *d3, __m128i *d4, __m128i *d5, __m128i *d6, __m128i *d7) {
  __m128i w0, w1, ww0, ww1, ww2, ww3;
  __m128i zero = _mm_setzero_si128();
  w0 = _mm_unpacklo_epi16(*x0, *x1);
  w1 = _mm_unpacklo_epi16(*x2, *x3);
  ww0 = _mm_unpacklo_epi32(w0, w1);
  ww1 = _mm_unpackhi_epi32(w0, w1);
  w0 = _mm_unpackhi_epi16(*x0, *x1);
  w1 = _mm_unpackhi_epi16(*x2, *x3);
  ww2 = _mm_unpacklo_epi32(w0, w1);
  ww3 = _mm_unpackhi_epi32(w0, w1);
  *d0 = _mm_unpacklo_epi64(ww0, zero);
  *d1 = _mm_unpackhi_epi64(ww0, zero);
  *d2 = _mm_unpacklo_epi64(ww1, zero);
  *d3 = _mm_unpackhi_epi64(ww1, zero);
  *d4 = _mm_unpacklo_epi64(ww2, zero);
  *d5 = _mm_unpackhi_epi64(ww2, zero);
  *d6 = _mm_unpacklo_epi64(ww3, zero);
  *d7 = _mm_unpackhi_epi64(ww3, zero);
}
```