user: What is the c source code of the assembly code below:

```asm
<transpose>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  movslq %edx,%rbx
  mov    %rbx,%rax
  sub    $0x1,%eax
  sub    $0xc8,%rsp
  shr    $0x2,%eax
  mov    %ebx,0x6c(%rsp)
  shl    $0x2,%rax
  mov    %rbx,0x88(%rsp)
  imul   $0x640,%ebx,%ebx
  mov    %rdi,0xb8(%rsp)
  mov    %rsi,0xa0(%rsp)
  mov    %ebx,0x94(%rsp)
  movq   $0x0,0x80(%rsp)
  movl   $0x0,0x7c(%rsp)
  mov    %rax,0xb0(%rsp)
L46:
  mov    0x7c(%rsp),%ebx
  mov    0xb8(%rsp),%rcx
  movq   $0x0,0x70(%rsp)
  movl   $0x0,0x78(%rsp)
  imul   $0x640,%ebx,%eax
  mov    %ebx,0x90(%rsp)
  movl   $0x0,0x68(%rsp)
  movl   $0x0,0x4c(%rsp)
  cltq
  lea    (%rcx,%rax,4),%rax
  mov    %rax,0x98(%rsp)
  mov    0x6c(%rsp),%eax
  add    %eax,%ebx
  mov    0xb0(%rsp),%rax
  add    0x80(%rsp),%rax
  mov    %ebx,0x7c(%rsp)
  mov    %rax,0xa8(%rsp)
  nopl   0x0(%rax)
L26:
  mov    0x6c(%rsp),%ebx
  add    %ebx,0x4c(%rsp)
  mov    0x7c(%rsp),%ebx
  cmp    %ebx,0x90(%rsp)
  jge    L47
  movslq 0x78(%rsp),%rax
  mov    0x80(%rsp),%rbx
  lea    (%rax,%rbx,1),%rdx
  mov    0xa0(%rsp),%rbx
  add    0xa8(%rsp),%rax
  lea    0x10(%rbx,%rax,4),%rax
  lea    (%rbx,%rdx,4),%rcx
  mov    0x70(%rsp),%rbx
  mov    %rax,0x50(%rsp)
  lea    0x0(,%rbx,4),%rax
  mov    %rcx,0x38(%rsp)
  mov    %rax,0x58(%rsp)
  mov    0x4c(%rsp),%eax
  sub    0x68(%rsp),%eax
  sub    $0x1,%eax
  shr    $0x2,%eax
  lea    (%rbx,%rax,4),%rax
  mov    0x98(%rsp),%rbx
  lea    0x10(,%rax,4),%rax
  mov    %rbx,0x40(%rsp)
  mov    %rax,0x60(%rsp)
  nopl   0x0(%rax,%rax,1)
L15:
  mov    0x40(%rsp),%rax
  mov    0x58(%rsp),%rbx
  mov    0x60(%rsp),%rcx
  add    %rax,%rbx
  add    %rax,%rcx
  mov    0x38(%rsp),%rax
  mov    %rcx,0x30(%rsp)
  mov    0x68(%rsp),%ecx
  mov    %rax,0x8(%rsp)
  cmp    %ecx,0x4c(%rsp)
  jle    L33
  nopw   0x0(%rax,%rax,1)
L41:
  mov    0x8(%rsp),%r14
  mov    %r14,%rdi
  call   <_mm_load_ps@plt>
  lea    0x1900(%r14),%rdi
  mov    %eax,%ebp
  call   <_mm_load_ps@plt>
  lea    0x3200(%r14),%rdi
  mov    %eax,0x28(%rsp)
  call   <_mm_load_ps@plt>
  lea    0x4b00(%r14),%rdi
  mov    %r14,0x8(%rsp)
  mov    %eax,%r12d
  call   <_mm_load_ps@plt>
  mov    0x28(%rsp),%esi
  mov    %ebp,%edi
  mov    %eax,%r15d
  call   <_mm_unpacklo_ps@plt>
  mov    %r15d,%esi
  mov    %r12d,%edi
  mov    %eax,%r13d
  call   <_mm_unpacklo_ps@plt>
  mov    0x28(%rsp),%esi
  mov    %ebp,%edi
  mov    %eax,%r14d
  call   <_mm_unpackhi_ps@plt>
  mov    %r15d,%esi
  mov    %r12d,%edi
  mov    %eax,%ebp
  call   <_mm_unpackhi_ps@plt>
  xor    %ecx,%ecx
  xor    %esi,%esi
  mov    $0x1,%edx
  mov    $0x1,%edi
  mov    %eax,%r12d
  call   <_MM_SHUFFLE@plt>
  mov    %r14d,%esi
  mov    %r13d,%edi
  mov    %eax,%edx
  call   <_mm_shuffle_ps@plt>
  mov    $0x2,%ecx
  mov    $0x3,%edx
  mov    $0x2,%esi
  mov    $0x3,%edi
  mov    %eax,0x48(%rsp)
  call   <_MM_SHUFFLE@plt>
  mov    %r14d,%esi
  mov    %r13d,%edi
  mov    %eax,%edx
  call   <_mm_shuffle_ps@plt>
  xor    %ecx,%ecx
  xor    %esi,%esi
  mov    $0x1,%edx
  mov    $0x1,%edi
  mov    %eax,0x2c(%rsp)
  call   <_MM_SHUFFLE@plt>
  mov    %r12d,%esi
  mov    %ebp,%edi
  mov    %eax,%edx
  call   <_mm_shuffle_ps@plt>
  mov    $0x2,%ecx
  mov    $0x3,%edx
  mov    $0x2,%esi
  mov    $0x3,%edi
  mov    %eax,%r14d
  call   <_MM_SHUFFLE@plt>
  mov    %r12d,%esi
  mov    %ebp,%edi
  mov    %eax,%edx
  call   <_mm_shuffle_ps@plt>
  mov    %rbx,%rdi
  mov    %eax,%r12d
  call   <_mm_load_ps@plt>
  lea    0x1900(%rbx),%rcx
  mov    %rcx,%rdi
  mov    %rcx,0x20(%rsp)
  mov    %eax,0x28(%rsp)
  call   <_mm_load_ps@plt>
  lea    0x3200(%rbx),%rdx
  mov    %rdx,%rdi
  mov    %rdx,0x18(%rsp)
  mov    %eax,%r15d
  call   <_mm_load_ps@plt>
  lea    0x4b00(%rbx),%r11
  mov    %r11,%rdi
  mov    %r11,0x10(%rsp)
  mov    %eax,%r13d
  call   <_mm_load_ps@plt>
  mov    0x48(%rsp),%esi
  mov    0x28(%rsp),%edi
  mov    %eax,%ebp
  call   <_mm_add_ps@plt>
  mov    0x2c(%rsp),%esi
  mov    %r15d,%edi
  mov    %eax,0x28(%rsp)
  call   <_mm_add_ps@plt>
  mov    %r13d,%edi
  mov    %r14d,%esi
  mov    %eax,%r15d
  call   <_mm_add_ps@plt>
  mov    %ebp,%edi
  mov    %r12d,%esi
  mov    %eax,%r13d
  call   <_mm_add_ps@plt>
  mov    0x28(%rsp),%esi
  mov    %rbx,%rdi
  mov    %eax,%ebp
  call   <_mm_store_ps@plt>
  mov    0x20(%rsp),%rdi
  mov    %r15d,%esi
  call   <_mm_store_ps@plt>
  mov    0x18(%rsp),%rdi
  mov    %r13d,%esi
  call   <_mm_store_ps@plt>
  mov    0x10(%rsp),%rdi
  mov    %ebp,%esi
  call   <_mm_store_ps@plt>
  addq   $0x6400,0x8(%rsp)
  add    $0x10,%rbx
  cmp    %rbx,0x30(%rsp)
  jne    L41
L33:
  addq   $0x10,0x38(%rsp)
  mov    0x38(%rsp),%rax
  addq   $0x6400,0x40(%rsp)
  cmp    0x50(%rsp),%rax
  jne    L15
L47:
  mov    0x6c(%rsp),%ebx
  add    %ebx,0x68(%rsp)
  mov    0x94(%rsp),%ebx
  add    %ebx,0x78(%rsp)
  mov    0x88(%rsp),%rbx
  add    %rbx,0x70(%rsp)
  cmpl   $0x63f,0x4c(%rsp)
  jle    L26
  mov    0x88(%rsp),%rbx
  add    %rbx,0x80(%rsp)
  cmpl   $0x63f,0x7c(%rsp)
  jle    L46
  add    $0xc8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void transpose(float *const restrict arg1, const float *const restrict arg2, const int blocksize) {
  int i, j, ti, tj;
  const int fstride1 = 1600;
  const int cstride0 = 1600;
  for (ti = 0; ti < 1600; ti += blocksize) {
    for (tj = 0; tj < 1600; tj += blocksize) {
      int upper_i = ti + blocksize;
      int upper_j = tj + blocksize;
      for (i = ti; i < upper_i; i += 4) {
        float *restrict a = arg1 + i * 1600;
        float *restrict b = arg2 + i;
        for (j = tj; j < upper_j; j += 4) {
          __m128 col1 = _mm_load_ps(b + j * fstride1);
          __m128 col2 = _mm_load_ps(b + (j + 1) * fstride1);
          __m128 col3 = _mm_load_ps(b + (j + 2) * fstride1);
          __m128 col4 = _mm_load_ps(b + (j + 3) * fstride1);
          __m128 a1 = _mm_unpacklo_ps(col1, col2);
          __m128 b1 = _mm_unpacklo_ps(col3, col4);
          __m128 c1 = _mm_unpackhi_ps(col1, col2);
          __m128 d1 = _mm_unpackhi_ps(col3, col4);
          __m128 newrow1 = _mm_shuffle_ps(a1, b1, _MM_SHUFFLE(1, 0, 1, 0));
          __m128 newrow2 = _mm_shuffle_ps(a1, b1, _MM_SHUFFLE(3, 2, 3, 2));
          __m128 newrow3 = _mm_shuffle_ps(c1, d1, _MM_SHUFFLE(1, 0, 1, 0));
          __m128 newrow4 = _mm_shuffle_ps(c1, d1, _MM_SHUFFLE(3, 2, 3, 2));
          __m128 row1 = _mm_load_ps(a + j);
          __m128 row2 = _mm_load_ps(a + j + cstride0);
          __m128 row3 = _mm_load_ps(a + j + 2 * cstride0);
          __m128 row4 = _mm_load_ps(a + j + 3 * cstride0);
          row1 = _mm_add_ps(row1, newrow1);
          row2 = _mm_add_ps(row2, newrow2);
          row3 = _mm_add_ps(row3, newrow3);
          row4 = _mm_add_ps(row4, newrow4);
          _mm_store_ps(a + j, row1);
          _mm_store_ps(a + j + cstride0, row2);
          _mm_store_ps(a + j + 2 * cstride0, row3);
          _mm_store_ps(a + j + 3 * cstride0, row4);
        }
      }
    }
  }
}
```