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

```asm
<canonical>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %edi,-0x14(%rbp)
  mov    -0x14(%rbp),%eax
  mov    %eax,-0x8(%rbp)
  movl   $0x0,-0x4(%rbp)
  jmp    L25
L22:
  mov    -0x14(%rbp),%eax
  shr    $0xc,%eax
  shl    $0x10,%eax
  and    $0x30000,%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0x6,%eax
  shl    $0xe,%eax
  movzwl %ax,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shl    $0xc,%eax
  and    $0x3000,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0xe,%eax
  shl    $0xa,%eax
  and    $0xc00,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  and    $0x300,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0x2,%eax
  shl    $0x6,%eax
  movzbl %al,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0x10,%eax
  shl    $0x4,%eax
  and    $0x30,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0xa,%eax
  shl    $0x2,%eax
  and    $0xc,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0x4,%eax
  and    $0x3,%eax
  or     %edx,%eax
  mov    %eax,-0x14(%rbp)
  cmpl   $0x3,-0x4(%rbp)
  jne    L4
  mov    -0x14(%rbp),%eax
  shr    $0xc,%eax
  shl    $0x10,%eax
  and    $0x30000,%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  and    $0xc000,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0x10,%eax
  shl    $0xc,%eax
  and    $0x3000,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0x6,%eax
  shl    $0xa,%eax
  and    $0xc00,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  and    $0x300,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0xa,%eax
  shl    $0x6,%eax
  movzbl %al,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shl    $0x4,%eax
  and    $0x30,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  and    $0xc,%eax
  or     %eax,%edx
  mov    -0x14(%rbp),%eax
  shr    $0x4,%eax
  and    $0x3,%eax
  or     %edx,%eax
  mov    %eax,-0x14(%rbp)
L4:
  mov    -0x14(%rbp),%edx
  mov    -0x8(%rbp),%eax
  mov    %edx,%esi
  mov    %eax,%edi
  call   <umin@plt>
  mov    %eax,-0x8(%rbp)
  addl   $0x1,-0x4(%rbp)
L25:
  cmpl   $0x7,-0x4(%rbp)
  jle    L22
  mov    -0x8(%rbp),%eax
  leave
  ret
```

assistant: ```c
unsigned canonical(unsigned conf0) {
  unsigned minconf = conf0;
  int r;
  for (r = 0; r <= 7; ++r) {
    conf0 = ((((((conf0) >> (2 * (6))) & 3)) << 16) | (((((conf0) >> (2 * (3))) & 3)) << 14) | (((((conf0) >> (2 * (0))) & 3)) << 12) | (((((conf0) >> (2 * (7))) & 3)) << 10) | (((((conf0) >> (2 * (4))) & 3)) << 8) | (((((conf0) >> (2 * (1))) & 3)) << 6) | (((((conf0) >> (2 * (8))) & 3)) << 4) | (((((conf0) >> (2 * (5))) & 3)) << 2) | ((((conf0) >> (2 * (2))) & 3)));
    if (r == 3)
      conf0 = ((((((conf0) >> (2 * (6))) & 3)) << 16) | (((((conf0) >> (2 * (7))) & 3)) << 14) | (((((conf0) >> (2 * (8))) & 3)) << 12) | (((((conf0) >> (2 * (3))) & 3)) << 10) | (((((conf0) >> (2 * (4))) & 3)) << 8) | (((((conf0) >> (2 * (5))) & 3)) << 6) | (((((conf0) >> (2 * (0))) & 3)) << 4) | (((((conf0) >> (2 * (1))) & 3)) << 2) | ((((conf0) >> (2 * (2))) & 3)));
    minconf = umin(minconf, conf0);
  }
  return minconf;
}
```