user: 下面的汇编指令对应的C源代码是什么:

```asm
<testdrawline>:
  endbr64
  push   %rbx
  xor    %ebx,%ebx
  nopw   0x0(%rax,%rax,1)
L7:
  mov    %ebx,%edx
  mov    $0x1,%r8d
  mov    $0x1f,%ecx
  xor    %esi,%esi
  xor    %edi,%edi
  add    $0x4,%ebx
  call   <drawLine@plt>
  xor    %eax,%eax
  call   <Display@plt>
  mov    $0x3e8,%edi
  call   <usleep@plt>
  cmp    $0x80,%ebx
  jne    L7
  xor    %ebx,%ebx
  nopl   0x0(%rax)
L15:
  mov    %ebx,%ecx
  mov    $0x1,%r8d
  mov    $0x7f,%edx
  xor    %esi,%esi
  xor    %edi,%edi
  add    $0x4,%ebx
  call   <drawLine@plt>
  xor    %eax,%eax
  call   <Display@plt>
  mov    $0x3e8,%edi
  call   <usleep@plt>
  cmp    $0x20,%ebx
  jne    L15
  mov    $0x3d090,%edi
  xor    %ebx,%ebx
  call   <usleep@plt>
  xor    %eax,%eax
  call   <clearDisplay@plt>
  nopw   0x0(%rax,%rax,1)
L33:
  mov    %ebx,%edx
  mov    $0x1,%r8d
  xor    %ecx,%ecx
  mov    $0x1f,%esi
  xor    %edi,%edi
  add    $0x4,%ebx
  call   <drawLine@plt>
  xor    %eax,%eax
  call   <Display@plt>
  mov    $0x3e8,%edi
  call   <usleep@plt>
  cmp    $0x80,%ebx
  jne    L33
  mov    $0x1f,%ebx
  nopw   0x0(%rax,%rax,1)
L66:
  mov    %ebx,%ecx
  mov    $0x1,%r8d
  mov    $0x7f,%edx
  xor    %edi,%edi
  mov    $0x1f,%esi
  sub    $0x4,%ebx
  call   <drawLine@plt>
  xor    %eax,%eax
  call   <Display@plt>
  mov    $0x3e8,%edi
  call   <usleep@plt>
  cmp    $0xffffffff,%ebx
  jne    L66
  mov    $0x3d090,%edi
  mov    $0x7f,%ebx
  call   <usleep@plt>
  xor    %eax,%eax
  call   <clearDisplay@plt>
  nopl   0x0(%rax,%rax,1)
L70:
  mov    %ebx,%edx
  mov    $0x1,%r8d
  xor    %ecx,%ecx
  mov    $0x1f,%esi
  mov    $0x7f,%edi
  sub    $0x4,%ebx
  call   <drawLine@plt>
  xor    %eax,%eax
  call   <Display@plt>
  mov    $0x3e8,%edi
  call   <usleep@plt>
  cmp    $0xffffffff,%ebx
  jne    L70
  mov    $0x1f,%ebx
  nopw   0x0(%rax,%rax,1)
L38:
  mov    %ebx,%ecx
  mov    $0x1,%r8d
  xor    %edx,%edx
  mov    $0x1f,%esi
  mov    $0x7f,%edi
  sub    $0x4,%ebx
  call   <drawLine@plt>
  xor    %eax,%eax
  call   <Display@plt>
  mov    $0x3e8,%edi
  call   <usleep@plt>
  cmp    $0xffffffff,%ebx
  jne    L38
  mov    $0x3d090,%edi
  xor    %ebx,%ebx
  call   <usleep@plt>
  xor    %eax,%eax
  call   <clearDisplay@plt>
  nopl   (%rax)
L1:
  mov    %ebx,%ecx
  mov    $0x1,%r8d
  xor    %edx,%edx
  xor    %esi,%esi
  mov    $0x7f,%edi
  add    $0x4,%ebx
  call   <drawLine@plt>
  xor    %eax,%eax
  call   <Display@plt>
  mov    $0x3e8,%edi
  call   <usleep@plt>
  cmp    $0x20,%ebx
  jne    L1
  xor    %ebx,%ebx
  nopl   0x0(%rax)
L75:
  mov    %ebx,%edx
  mov    $0x1,%r8d
  mov    $0x1f,%ecx
  xor    %esi,%esi
  mov    $0x7f,%edi
  add    $0x4,%ebx
  call   <drawLine@plt>
  xor    %eax,%eax
  call   <Display@plt>
  mov    $0x3e8,%edi
  call   <usleep@plt>
  cmp    $0x80,%ebx
  jne    L75
  mov    $0x3d090,%edi
  pop    %rbx
  jmp    10b0 <usleep@plt>
```

assistant: ```c
void testdrawline() {
  short i = 0;
  for (i = 0; i < 128; i += 4) {
    drawLine(0, 0, i, 32 - 1, 1);
    Display();
    usleep(1000);
  }
  for (i = 0; i < 32; i += 4) {
    drawLine(0, 0, 128 - 1, i, 1);
    Display();
    usleep(1000);
  }
  usleep(250000);
  clearDisplay();
  for (i = 0; i < 128; i += 4) {
    drawLine(0, 32 - 1, i, 0, 1);
    Display();
    usleep(1000);
  }
  for (i = 32 - 1; i >= 0; i -= 4) {
    drawLine(0, 32 - 1, 128 - 1, i, 1);
    Display();
    usleep(1000);
  }
  usleep(250000);
  clearDisplay();
  for (i = 128 - 1; i >= 0; i -= 4) {
    drawLine(128 - 1, 32 - 1, i, 0, 1);
    Display();
    usleep(1000);
  }
  for (i = 32 - 1; i >= 0; i -= 4) {
    drawLine(128 - 1, 32 - 1, 0, i, 1);
    Display();
    usleep(1000);
  }
  usleep(250000);
  clearDisplay();
  for (i = 0; i < 32; i += 4) {
    drawLine(128 - 1, 0, 0, i, 1);
    Display();
    usleep(1000);
  }
  for (i = 0; i < 128; i += 4) {
    drawLine(128 - 1, 0, i, 32 - 1, 1);
    Display();
    usleep(1000);
  }
  usleep(250000);
}
```