user: 下面的汇编指令对应的C源代码是什么:

```asm
<generateMatrix>:
  endbr64
  push   %r15
  mov    %rdx,%r15
  push   %r14
  movslq %edi,%r14
  push   %r13
  lea    0x0(,%r14,8),%edi
  mov    %r14,%r13
  push   %r12
  push   %rbp
  mov    %r14d,%ebp
  push   %rbx
  imul   %r14d,%ebp
  sub    $0x18,%rsp
  mov    %rsi,0x8(%rsp)
  call   <malloc@plt>
  lea    0x0(,%rbp,4),%edi
  mov    %rax,%r12
  call   <malloc@plt>
  mov    0x8(%rsp),%rsi
  lea    0x0(,%r14,4),%edi
  mov    %rax,%rbx
  mov    %r14d,(%rsi)
  call   <malloc@plt>
  mov    %rax,(%r15)
  test   %r14d,%r14d
  jle    L103
  lea    0x0(,%r14,4),%rcx
  mov    %rbx,%rdx
  xor    %eax,%eax
L171:
  mov    %rdx,(%r12,%rax,2)
  mov    (%r15),%rsi
  add    %rcx,%rdx
  mov    %r13d,(%rsi,%rax,1)
  add    $0x4,%rax
  cmp    %rcx,%rax
  jne    L171
L103:
  lea    -0x1(%r13),%esi
  test   %ebp,%ebp
  je     L204
  mov    %esi,%r11d
  xor    %eax,%eax
  xor    %r10d,%r10d
  xor    %r9d,%r9d
  xor    %edx,%edx
  nopl   0x0(%rax)
L202:
  cmp    $0x2,%edx
  je     L129
  jg     L0
  test   %edx,%edx
  je     L145
  cmp    $0x1,%edx
  jne    L41
  mov    %eax,%r8d
  cmp    %esi,%r9d
  jg     L67
  movslq %r11d,%rbx
  movslq %r9d,%rcx
  lea    0x1(%rsi,%rax,1),%r8d
  shl    $0x2,%rbx
  lea    (%r12,%rcx,8),%rcx
  sub    %r9d,%r8d
  cs nopw 0x0(%rax,%rax,1)
L117:
  mov    (%rcx),%rdi
  add    $0x1,%eax
  add    $0x8,%rcx
  mov    %eax,(%rdi,%rbx,1)
  cmp    %r8d,%eax
  jne    L117
L67:
  sub    $0x1,%r11d
  mov    %r8d,%eax
  nopl   0x0(%rax)
L41:
  add    $0x1,%edx
  and    $0x3,%edx
  cmp    %eax,%ebp
  jg     L202
L204:
  add    $0x18,%rsp
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L0:
  cmp    $0x3,%edx
  jne    L41
  mov    %eax,%r8d
  cmp    %esi,%r9d
  jg     L19
  movslq %r10d,%rbx
  movslq %esi,%rcx
  lea    0x1(%rsi,%rax,1),%r8d
  shl    $0x2,%rbx
  lea    (%r12,%rcx,8),%rcx
  sub    %r9d,%r8d
  nopl   0x0(%rax,%rax,1)
L5:
  mov    (%rcx),%rdi
  add    $0x1,%eax
  sub    $0x8,%rcx
  mov    %eax,(%rdi,%rbx,1)
  cmp    %r8d,%eax
  jne    L5
L19:
  add    $0x1,%r10d
  mov    %r8d,%eax
  jmp    L41
  nopl   0x0(%rax,%rax,1)
L129:
  mov    %eax,%edi
  cmp    %r11d,%r10d
  jg     L175
  movslq %esi,%rdi
  movslq %r11d,%rcx
  mov    (%r12,%rdi,8),%rdi
  lea    (%rdi,%rcx,4),%rcx
  lea    0x1(%r11,%rax,1),%edi
  sub    %r10d,%edi
  nopl   (%rax)
L105:
  add    $0x1,%eax
  sub    $0x4,%rcx
  mov    %eax,0x4(%rcx)
  cmp    %edi,%eax
  jne    L105
L175:
  sub    $0x1,%esi
  mov    %edi,%eax
  jmp    L41
L145:
  cmp    %r11d,%r10d
  jg     L95
  movslq %r9d,%rdi
  movslq %r10d,%rcx
  mov    (%r12,%rdi,8),%rdi
  lea    (%rdi,%rcx,4),%rcx
  lea    0x1(%r11,%rax,1),%edi
  sub    %r10d,%edi
  nopl   0x0(%rax,%rax,1)
L77:
  add    $0x1,%eax
  add    $0x4,%rcx
  mov    %eax,-0x4(%rcx)
  cmp    %edi,%eax
  jne    L77
  add    $0x1,%r9d
  mov    %edi,%eax
  jmp    L41
  nopl   0x0(%rax)
L95:
  mov    %eax,%edi
  add    $0x1,%r9d
  mov    %edi,%eax
  jmp    L41
```

assistant: ```c
int **generateMatrix(int n, int *returnSize, int **returnColumnSizes) {
  int i;
  int **matrix = malloc(n * sizeof(int *));
  int *nums = malloc(n * n * sizeof(int));
  *returnSize = n;
  *returnColumnSizes = malloc(n * sizeof(int));
  for (i = 0; i < n; i++) {
    matrix[i] = &nums[i * n];
    (*returnColumnSizes)[i] = n;
  }
  int direction = 0;
  int hor_top = 0;
  int hor_bottom = n - 1;
  int ver_left = 0;
  int ver_right = n - 1;
  int num = 0;
  while (num < n * n) {
    switch (direction) {
    case 0:
      for (i = ver_left; i <= ver_right; i++) {
        matrix[hor_top][i] = ++num;
      }
      hor_top++;
      break;
    case 1:
      for (i = hor_top; i <= hor_bottom; i++) {
        matrix[i][ver_right] = ++num;
      }
      ver_right--;
      break;
    case 2:
      for (i = ver_right; i >= ver_left; i--) {
        matrix[hor_bottom][i] = ++num;
      }
      hor_bottom--;
      break;
    case 3:
      for (i = hor_bottom; i >= hor_top; i--) {
        matrix[i][ver_left] = ++num;
      }
      ver_left++;
      break;
    }
    direction++;
    direction %= 4;
  }
  return matrix;
}
```