user: Demonstrate the C code that generates the assembly output below:

```asm
<solve_at_xy>:
  endbr64
  push   %r15
  movslq %esi,%rax
  mov    %edx,%esi
  mov    $0x1,%r15d
  push   %r14
  push   %r13
  push   %r12
  mov    %rdi,%r12
  push   %rbp
  push   %rbx
  mov    %rax,%rbx
  sub    $0x48,%rsp
  mov    %edx,0x10(%rsp)
  lea    (%rax,%rax,8),%rdx
  imul   $0x55555556,%rax,%rax
  lea    (%rdi,%rdx,4),%rdx
  mov    %rdx,0x18(%rsp)
  mov    %ebx,%edx
  sar    $0x1f,%edx
  shr    $0x20,%rax
  sub    %edx,%eax
  movslq %esi,%rdx
  sar    $0x1f,%esi
  lea    (%rax,%rax,2),%edi
  imul   $0x55555556,%rdx,%rax
  mov    %edi,0x24(%rsp)
  shr    $0x20,%rax
  sub    %esi,%eax
  lea    (%rax,%rax,2),%esi
  lea    0x2(%rdi),%eax
  mov    %eax,0x20(%rsp)
  lea    0x3(%rdi),%eax
  lea    0x2(%rsi),%r14d
  mov    %eax,0x30(%rsp)
  lea    0x3(%rsi),%eax
  mov    %eax,0x34(%rsp)
  lea    (%r12,%rdx,4),%rax
  movslq %esi,%rdx
  mov    %rax,0x38(%rsp)
  movslq %edi,%rax
  lea    (%rax,%rax,8),%rax
  mov    %esi,0x14(%rsp)
  add    %rdx,%rax
  lea    (%r12,%rax,4),%rax
  mov    %rax,0x28(%rsp)
  nop
L144:
  mov    0x10(%rsp),%ecx
  mov    %ebx,%edx
  mov    %r15d,%esi
  mov    %r12,%rdi
  call   <check_conflict@plt>
  cmp    $0x1,%eax
  je     L141
  mov    %r14d,(%rsp)
  mov    0x18(%rsp),%r13
  mov    %ebx,%r14d
  xor    %ebp,%ebp
  mov    0x10(%rsp),%ebx
  nopl   0x0(%rax)
L49:
  mov    0x0(%r13,%rbp,4),%esi
  mov    %ebp,%ecx
  test   %esi,%esi
  jne    L211
  cmp    %ebp,%ebx
  je     L211
  mov    %r14d,%edx
  mov    %r15d,%esi
  mov    %r12,%rdi
  call   <check_conflict@plt>
  test   %eax,%eax
  je     L226
L211:
  add    $0x1,%rbp
  cmp    $0x9,%rbp
  jne    L49
L235:
  add    $0x48,%rsp
  mov    %r15d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L8:
  mov    (%rsp),%r14d
  mov    0x28(%rsp),%rax
  mov    %r12,(%rsp)
  mov    0x24(%rsp),%r13d
  mov    %rax,0x8(%rsp)
  mov    %r14d,%eax
  mov    %r13d,%r14d
  mov    %eax,%r13d
  nopl   0x0(%rax)
L124:
  mov    %ebx,%eax
  mov    0x8(%rsp),%r12
  mov    %r15d,%ebx
  mov    0x14(%rsp),%ebp
  mov    %eax,%r15d
  jmp    L68
  nopl   0x0(%rax,%rax,1)
L183:
  add    $0x1,%ebp
  add    $0x4,%r12
  cmp    %r13d,%ebp
  jg     L162
L68:
  mov    (%r12),%eax
  test   %eax,%eax
  jne    L183
  cmp    %r14d,%r15d
  jne    L47
  cmp    %ebp,0x10(%rsp)
  je     L183
L47:
  mov    (%rsp),%rdi
  mov    %ebp,%ecx
  mov    %r14d,%edx
  mov    %ebx,%esi
  call   <check_conflict@plt>
  test   %eax,%eax
  jne    L183
  mov    %r15d,%esi
  mov    %r13d,%eax
  mov    (%rsp),%r12
  mov    %ebx,%r15d
  mov    %r14d,%r13d
  mov    %esi,%ebx
  mov    %eax,%r14d
L187:
  cmp    %r13d,0x30(%rsp)
  je     L147
L141:
  add    $0x1,%r15d
  cmp    $0xa,%r15d
  jne    L144
L62:
  xor    %r15d,%r15d
  jmp    L235
L226:
  mov    %r14d,%ebx
  mov    0x38(%rsp),%rbp
  mov    0x10(%rsp),%r14d
  mov    %eax,%r13d
  nopl   0x0(%rax)
L115:
  mov    0x0(%rbp),%edx
  test   %edx,%edx
  jne    L48
  cmp    %r13d,%ebx
  je     L48
  mov    %r14d,%ecx
  mov    %r13d,%edx
  mov    %r15d,%esi
  mov    %r12,%rdi
  call   <check_conflict@plt>
  test   %eax,%eax
  je     L8
L48:
  add    $0x1,%r13d
  add    $0x24,%rbp
  cmp    $0x9,%r13d
  jne    L115
  jmp    L235
L147:
  cmp    %ebp,0x34(%rsp)
  je     L235
  add    $0x1,%r15d
  cmp    $0xa,%r15d
  jne    L144
  jmp    L62
  nopw   0x0(%rax,%rax,1)
L162:
  mov    %r15d,%eax
  addq   $0x24,0x8(%rsp)
  mov    %ebx,%r15d
  add    $0x1,%r14d
  mov    %eax,%ebx
  cmp    0x20(%rsp),%r14d
  jle    L124
  mov    %r13d,%eax
  mov    (%rsp),%r12
  mov    %r14d,%r13d
  mov    %eax,%r14d
  jmp    L187
```

assistant: ```c
int solve_at_xy(const int sudoku[9][9], const int row_no, const int column_no) {
  int test_value, i, j, row_start, column_start;
  for (test_value = 1; test_value <= 9; ++test_value) {
    if (check_conflict(sudoku, test_value, row_no, column_no) == 1) {
      continue;
    }
    for (i = 0; i < 9; ++i) {
      if ((sudoku[row_no][i] != 0) || (i == column_no)) {
        continue;
      }
      if (check_conflict(sudoku, test_value, row_no, i) == 0) {
        break;
      }
    }
    if (i == 9) {
      return test_value;
    }
    for (i = 0; i < 9; ++i) {
      if ((sudoku[i][column_no] != 0) || (i == row_no)) {
        continue;
      }
      if (check_conflict(sudoku, test_value, i, column_no) == 0) {
        break;
      }
    }
    if (i == 9) {
      return test_value;
    }
    row_start = row_no - (row_no % 3);
    column_start = column_no - (column_no % 3);
    for (i = row_start; i < row_start + 3; ++i) {
      for (j = column_start; j < column_start + 3; ++j) {
        if ((sudoku[i][j] != 0) || (i == row_no && j == column_no)) {
          continue;
        }
        if (check_conflict(sudoku, test_value, i, j) == 0) {
          break;
        }
      }
      if (j < column_start + 3) {
        break;
      }
    }
    if ((i == row_start + 3) && (j == column_start + 3)) {
      return test_value;
    }
  }
  return 0;
}
```