user: 下面的汇编指令对应的C源代码是什么:

```asm
<transpose>:
  endbr64
  mov    %rsi,%rax
  mov    %rdx,%rsi
  mov    %edi,%edx
  mov    %edi,%r8d
  imul   %edi,%edx
  sub    $0x1,%edx
  test   %edi,%edi
  jle    L21
  lea    -0x1(%rdi),%r10d
  movslq %edx,%rdx
  movslq %edi,%rcx
  xor    %edi,%edi
  shr    $0x5,%r10d
  lea    0x0(,%rdx,4),%r9
  shl    $0x2,%rcx
  add    $0x1,%r10d
  neg    %r9
  shl    $0x7,%r10
  nopl   0x0(%rax)
L10:
  mov    %rsi,%rdx
  add    %r10,%rsi
  xchg   %ax,%ax
L4:
  mov    (%rax),%r11d
  add    %rcx,%rax
  sub    $0xffffffffffffff80,%rdx
  mov    %r11d,-0x80(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x7c(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x78(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x74(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x70(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x6c(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x68(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x64(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x60(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x5c(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x58(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x54(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x50(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x4c(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x48(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x44(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x40(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x3c(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x38(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x34(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x30(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x2c(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x28(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x24(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x20(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x1c(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x18(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x14(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x10(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0xc(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x8(%rdx)
  mov    (%rax),%r11d
  add    %rcx,%rax
  mov    %r11d,-0x4(%rdx)
  cmp    %rsi,%rdx
  jne    L4
  add    $0x1,%edi
  add    %r9,%rax
  cmp    %edi,%r8d
  jne    L10
L21:
  ret
```

assistant: ```c
void transpose(int dim, int *src, int *dst) {
  int i, j, di = dim * dim - 1;
  for (i = 0; i < dim; i++, src -= di)
    for (j = 0; j < dim; j += 32) {
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
      *dst++ = *src;
      src += dim;
    }
}
```