user: 下面的汇编指令对应的C源代码是什么：

```asm
<SysCtlClockSet>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  mov    0x400fe000,%rax
  test   $0x70000000,%eax
  je     L51
  mov    0x400fe000,%rax
  and    $0x70ff0000,%eax
  cmp    $0x10000000,%rax
  jne    L115
L51:
  test   $0x80000000,%ebx
  jne    L11
L115:
  mov    0x400fe060,%rax
  mov    0x400fe070,%r12
  mov    %rax,%rbp
  and    $0xffffffffffbfffff,%rbp
  or     $0x800,%rbp
  mov    %r12,%rdx
  or     $0x8,%dh
  mov    %rbp,0x400fe060
  mov    %rdx,0x400fe070
  test   $0x2,%al
  je     L91
  test   $0x2,%bl
  je     L23
L91:
  test   $0x1,%al
  je     L46
  test   $0x1,%bl
  jne    L46
L23:
  mov    %rbx,%rax
  or     $0xfffffffffffffffc,%rax
  and    %rax,%rbp
  mov    %rbp,0x400fe060
  test   $0x80000000,%r12d
  je     L98
  mov    %r12,%rax
  and    $0x30,%eax
  cmp    $0x30,%rax
  jne    L103
L166:
  mov    $0x1000,%edi
  call   <SysCtlDelay@plt>
  jmp    L46
L98:
  mov    %rbp,%rax
  and    $0x30,%eax
  cmp    $0x30,%rax
  je     L166
L103:
  mov    $0x80000,%edi
  call   <SysCtlDelay@plt>
L46:
  and    $0xfffffffffffff80f,%rbp
  mov    %rbx,%rax
  and    $0x7f0,%eax
  or     %rax,%rbp
  mov    %r12,%rax
  and    $0x7fffff8f,%eax
  mov    %rbx,%rdx
  and    $0x80000030,%edx
  or     %rdx,%rax
  lea    0x0(,%rbx,8),%rdx
  and    $0x40,%edx
  or     %rdx,%rax
  mov    %rax,%r12
  or     $0x8,%ah
  mov    %rbp,0x400fe060
  mov    %rax,0x400fe070
  mov    $0x10,%edi
  call   <SysCtlDelay@plt>
  mov    %rbp,%rax
  and    $0xcf,%ah
  mov    %rbx,%rbp
  and    $0x3000,%ebp
  or     %rax,%rbp
  mov    %r12,%rax
  and    $0xdf,%ah
  mov    %rbx,%rdx
  and    $0x2000,%edx
  or     %rdx,%rax
  mov    %rax,%rdx
  or     $0x8,%dh
  movq   $0x40,0x400fe058
  test   $0x80000000,%eax
  je     L74
  mov    %rdx,0x400fe070
  mov    %rbp,0x400fe060
L22:
  and    $0xfffffffff83ffffc,%rbp
  mov    %rbx,%rcx
  and    $0x7c00003,%ecx
  or     %rbp,%rcx
  and    $0xffffffffe07fffff,%rax
  or     $0x8,%ah
  mov    %rbx,%rdx
  and    $0x1f800000,%edx
  or     %rdx,%rax
  mov    %rax,%rsi
  and    $0xffffffffbfffffff,%rsi
  test   $0x40000000,%ebx
  je     L95
  or     $0x400000,%rcx
  and    $0xffffffffffbfffff,%rax
  mov    %rbx,%rsi
  and    $0x40400000,%esi
  or     %rax,%rsi
L95:
  test   $0x8,%bh
  jne    L81
  mov    $0x8000,%eax
L38:
  mov    0x400fe050,%rdx
  test   $0x40,%dl
  jne    L136
  sub    $0x1,%rax
  jne    L38
L136:
  and    $0xf7,%ch
  and    $0xfffffffffffff7ff,%rsi
L81:
  mov    %rcx,0x400fe060
  mov    %rsi,0x400fe070
  mov    $0x10,%edi
  call   <SysCtlDelay@plt>
L11:
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
L74:
  mov    %rbp,0x400fe060
  mov    %rdx,0x400fe070
  jmp    L22
```

assistant: ```c
void SysCtlClockSet(unsigned long ulConfig) {
  unsigned long ulDelay, ulRCC, ulRCC2;
  if (((((*((volatile unsigned long *)(0x400FE000))) & 0x70000000) == 0x00000000) || (((*((volatile unsigned long *)(0x400FE000))) & (0x70000000 | 0x00FF0000)) == (0x10000000 | 0x00000000))) && (ulConfig & 0x80000000)) {
    return;
  }
  ulRCC = (*((volatile unsigned long *)(0x400FE060)));
  ulRCC2 = (*((volatile unsigned long *)(0x400FE070)));
  ulRCC |= 0x00000800;
  ulRCC &= ~(0x00400000);
  ulRCC2 |= 0x00000800;
  (*((volatile unsigned long *)(0x400FE060))) = ulRCC;
  (*((volatile unsigned long *)(0x400FE070))) = ulRCC2;
  if (((ulRCC & 0x00000002) && !(ulConfig & 0x00000002)) || ((ulRCC & 0x00000001) && !(ulConfig & 0x00000001))) {
    ulRCC &= (~(0x00000002 | 0x00000001) | (ulConfig & (0x00000002 | 0x00000001)));
    (*((volatile unsigned long *)(0x400FE060))) = ulRCC;
    if (((ulRCC2 & 0x80000000) && (((ulRCC2 & 0x00000070) == 0x00000030) || ((ulRCC2 & 0x00000070) == 0x00000070))) || (!(ulRCC2 & 0x80000000) && ((ulRCC & 0x00000030) == 0x00000030))) {
      SysCtlDelay(4096);
    } else {
      SysCtlDelay(524288);
    }
  }
  ulRCC &= ~(0x000007C0 | 0x00000030);
  ulRCC |= ulConfig & (0x000007C0 | 0x00000030);
  ulRCC2 &= ~(0x80000000 | 0x00000070);
  ulRCC2 |= ulConfig & (0x80000000 | 0x00000030);
  ulRCC2 |= (ulConfig & 0x00000008) << 3;
  (*((volatile unsigned long *)(0x400FE060))) = ulRCC;
  (*((volatile unsigned long *)(0x400FE070))) = ulRCC2;
  SysCtlDelay(16);
  ulRCC &= ~(0x00002000 | 0x00001000);
  ulRCC |= ulConfig & (0x00002000 | 0x00001000);
  ulRCC2 &= ~(0x00002000);
  ulRCC2 |= ulConfig & 0x00002000;
  (*((volatile unsigned long *)(0x400FE058))) = 0x00000040;
  if (ulRCC2 & 0x80000000) {
    (*((volatile unsigned long *)(0x400FE070))) = ulRCC2;
    (*((volatile unsigned long *)(0x400FE060))) = ulRCC;
  } else {
    (*((volatile unsigned long *)(0x400FE060))) = ulRCC;
    (*((volatile unsigned long *)(0x400FE070))) = ulRCC2;
  }
  ulRCC &= ~(0x07800000 | 0x00400000 | 0x00000002 | 0x00000001);
  ulRCC |= ulConfig & (0x07800000 | 0x00400000 | 0x00000002 | 0x00000001);
  ulRCC2 &= ~(0x1F800000);
  ulRCC2 |= ulConfig & 0x1F800000;
  if (ulConfig & 0x40000000) {
    ulRCC |= 0x00400000;
    ulRCC2 &= ~(0x00400000);
    ulRCC2 |= ulConfig & (0x40000000 | 0x00400000);
  } else {
    ulRCC2 &= ~(0x40000000);
  }
  if (!(ulConfig & 0x00000800)) {
    for (ulDelay = 32768; ulDelay > 0; ulDelay--) {
      if ((*((volatile unsigned long *)(0x400FE050))) & 0x00000040) {
        break;
      }
    }
    ulRCC &= ~(0x00000800);
    ulRCC2 &= ~(0x00000800);
  }
  (*((volatile unsigned long *)(0x400FE060))) = ulRCC;
  (*((volatile unsigned long *)(0x400FE070))) = ulRCC2;
  SysCtlDelay(16);
}
```