user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<fiat_p224_to_bytes>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
  mov    $0xff,%edi
  sub    $0x68,%rsp
  mov    0x18(%rsi),%edx
  mov    0x14(%rsi),%ecx
  mov    0x10(%rsi),%r8d
  mov    0xc(%rsi),%r9d
  mov    0x8(%rsi),%r10d
  mov    0x4(%rsi),%r11d
  mov    %edx,0x5c(%rsp)
  mov    (%rsi),%esi
  mov    %ecx,0x58(%rsp)
  mov    %r8d,0x54(%rsp)
  mov    %r9d,0x50(%rsp)
  mov    %r10d,0x4c(%rsp)
  mov    %r11d,0x48(%rsp)
  mov    %esi,0x44(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,%r12d
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,%r15d
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x8(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0xc(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x10(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x14(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x18(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x1c(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x20(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x24(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x28(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x2c(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x30(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x34(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x38(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x3c(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,0x40(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,%r14d
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,%ebp
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,%r13d
  call   <UINT8_C@plt>
  mov    0x44(%rsp),%esi
  mov    0x48(%rsp),%r11d
  mov    0x4c(%rsp),%r10d
  mov    0x50(%rsp),%r9d
  mov    %esi,%edi
  and    %esi,%r12d
  mov    0x54(%rsp),%r8d
  sar    $0x8,%edi
  movslq %r12d,%r12
  and    %r15d,%edi
  mov    %r12,(%rbx)
  movslq %edi,%rdi
  mov    %rdi,0x8(%rbx)
  mov    %esi,%edi
  sar    $0x18,%esi
  movslq %esi,%rsi
  sar    $0x10,%edi
  and    0x8(%rsp),%edi
  mov    %rsi,0x18(%rbx)
  mov    0xc(%rsp),%esi
  movslq %edi,%rdi
  mov    %rdi,0x10(%rbx)
  and    %r11d,%esi
  movslq %esi,%rsi
  mov    %rsi,0x20(%rbx)
  mov    %r11d,%esi
  sar    $0x8,%esi
  and    0x10(%rsp),%esi
  movslq %esi,%rsi
  mov    %rsi,0x28(%rbx)
  mov    %r11d,%esi
  sar    $0x10,%esi
  and    0x14(%rsp),%esi
  sar    $0x18,%r11d
  movslq %esi,%rsi
  movslq %r11d,%r11
  mov    %rsi,0x30(%rbx)
  mov    0x18(%rsp),%esi
  mov    %r11,0x38(%rbx)
  and    %r10d,%esi
  movslq %esi,%rsi
  mov    %rsi,0x40(%rbx)
  mov    %r10d,%esi
  sar    $0x8,%esi
  and    0x1c(%rsp),%esi
  movslq %esi,%rsi
  mov    %rsi,0x48(%rbx)
  mov    %r10d,%esi
  sar    $0x18,%r10d
  sar    $0x10,%esi
  and    0x20(%rsp),%esi
  movslq %r10d,%r10
  movslq %esi,%rsi
  mov    %r10,0x58(%rbx)
  mov    %rsi,0x50(%rbx)
  mov    0x24(%rsp),%esi
  and    %r9d,%esi
  movslq %esi,%rsi
  mov    %rsi,0x60(%rbx)
  mov    %r9d,%esi
  sar    $0x8,%esi
  and    0x28(%rsp),%esi
  movslq %esi,%rsi
  mov    %rsi,0x68(%rbx)
  mov    %r9d,%esi
  sar    $0x18,%r9d
  sar    $0x10,%esi
  and    0x2c(%rsp),%esi
  movslq %r9d,%r9
  movslq %esi,%rsi
  mov    %r9,0x78(%rbx)
  mov    %rsi,0x70(%rbx)
  mov    0x30(%rsp),%esi
  and    %r8d,%esi
  movslq %esi,%rsi
  mov    %rsi,0x80(%rbx)
  mov    %r8d,%esi
  mov    0x58(%rsp),%ecx
  sar    $0x8,%esi
  and    0x34(%rsp),%esi
  mov    0x5c(%rsp),%edx
  movslq %esi,%rsi
  mov    %rsi,0x88(%rbx)
  mov    %r8d,%esi
  and    %edx,%ebp
  sar    $0x18,%r8d
  sar    $0x10,%esi
  and    0x38(%rsp),%esi
  movslq %ebp,%rbp
  movslq %r8d,%r8
  movslq %esi,%rsi
  mov    %rbp,0xc0(%rbx)
  mov    %rsi,0x90(%rbx)
  mov    0x3c(%rsp),%esi
  mov    %r8,0x98(%rbx)
  and    %ecx,%esi
  movslq %esi,%rsi
  mov    %rsi,0xa0(%rbx)
  mov    %ecx,%esi
  sar    $0x8,%esi
  and    0x40(%rsp),%esi
  movslq %esi,%rsi
  mov    %rsi,0xa8(%rbx)
  mov    %ecx,%esi
  sar    $0x18,%ecx
  movslq %ecx,%rcx
  sar    $0x10,%esi
  mov    %rcx,0xb8(%rbx)
  mov    %edx,%ecx
  and    %r14d,%esi
  sar    $0x8,%ecx
  movslq %esi,%rsi
  and    %r13d,%ecx
  mov    %rsi,0xb0(%rbx)
  movslq %ecx,%rcx
  mov    %rcx,0xc8(%rbx)
  mov    %edx,%ecx
  sar    $0x18,%edx
  sar    $0x10,%ecx
  movslq %edx,%rdx
  and    %eax,%ecx
  mov    %rdx,0xd8(%rbx)
  movslq %ecx,%rcx
  mov    %rcx,0xd0(%rbx)
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void fiat_p224_to_bytes(uint8_t out1[28], const uint32_t arg1[7]) {
  uint32_t x1;
  uint32_t x2;
  uint32_t x3;
  uint32_t x4;
  uint32_t x5;
  uint32_t x6;
  uint32_t x7;
  uint8_t x8;
  uint32_t x9;
  uint8_t x10;
  uint32_t x11;
  uint8_t x12;
  uint8_t x13;
  uint8_t x14;
  uint32_t x15;
  uint8_t x16;
  uint32_t x17;
  uint8_t x18;
  uint8_t x19;
  uint8_t x20;
  uint32_t x21;
  uint8_t x22;
  uint32_t x23;
  uint8_t x24;
  uint8_t x25;
  uint8_t x26;
  uint32_t x27;
  uint8_t x28;
  uint32_t x29;
  uint8_t x30;
  uint8_t x31;
  uint8_t x32;
  uint32_t x33;
  uint8_t x34;
  uint32_t x35;
  uint8_t x36;
  uint8_t x37;
  uint8_t x38;
  uint32_t x39;
  uint8_t x40;
  uint32_t x41;
  uint8_t x42;
  uint8_t x43;
  uint8_t x44;
  uint32_t x45;
  uint8_t x46;
  uint32_t x47;
  uint8_t x48;
  uint8_t x49;
  x1 = (arg1[6]);
  x2 = (arg1[5]);
  x3 = (arg1[4]);
  x4 = (arg1[3]);
  x5 = (arg1[2]);
  x6 = (arg1[1]);
  x7 = (arg1[0]);
  x8 = (uint8_t)(x7 & UINT8_C(0xff));
  x9 = (x7 >> 8);
  x10 = (uint8_t)(x9 & UINT8_C(0xff));
  x11 = (x9 >> 8);
  x12 = (uint8_t)(x11 & UINT8_C(0xff));
  x13 = (uint8_t)(x11 >> 8);
  x14 = (uint8_t)(x6 & UINT8_C(0xff));
  x15 = (x6 >> 8);
  x16 = (uint8_t)(x15 & UINT8_C(0xff));
  x17 = (x15 >> 8);
  x18 = (uint8_t)(x17 & UINT8_C(0xff));
  x19 = (uint8_t)(x17 >> 8);
  x20 = (uint8_t)(x5 & UINT8_C(0xff));
  x21 = (x5 >> 8);
  x22 = (uint8_t)(x21 & UINT8_C(0xff));
  x23 = (x21 >> 8);
  x24 = (uint8_t)(x23 & UINT8_C(0xff));
  x25 = (uint8_t)(x23 >> 8);
  x26 = (uint8_t)(x4 & UINT8_C(0xff));
  x27 = (x4 >> 8);
  x28 = (uint8_t)(x27 & UINT8_C(0xff));
  x29 = (x27 >> 8);
  x30 = (uint8_t)(x29 & UINT8_C(0xff));
  x31 = (uint8_t)(x29 >> 8);
  x32 = (uint8_t)(x3 & UINT8_C(0xff));
  x33 = (x3 >> 8);
  x34 = (uint8_t)(x33 & UINT8_C(0xff));
  x35 = (x33 >> 8);
  x36 = (uint8_t)(x35 & UINT8_C(0xff));
  x37 = (uint8_t)(x35 >> 8);
  x38 = (uint8_t)(x2 & UINT8_C(0xff));
  x39 = (x2 >> 8);
  x40 = (uint8_t)(x39 & UINT8_C(0xff));
  x41 = (x39 >> 8);
  x42 = (uint8_t)(x41 & UINT8_C(0xff));
  x43 = (uint8_t)(x41 >> 8);
  x44 = (uint8_t)(x1 & UINT8_C(0xff));
  x45 = (x1 >> 8);
  x46 = (uint8_t)(x45 & UINT8_C(0xff));
  x47 = (x45 >> 8);
  x48 = (uint8_t)(x47 & UINT8_C(0xff));
  x49 = (uint8_t)(x47 >> 8);
  out1[0] = x8;
  out1[1] = x10;
  out1[2] = x12;
  out1[3] = x13;
  out1[4] = x14;
  out1[5] = x16;
  out1[6] = x18;
  out1[7] = x19;
  out1[8] = x20;
  out1[9] = x22;
  out1[10] = x24;
  out1[11] = x25;
  out1[12] = x26;
  out1[13] = x28;
  out1[14] = x30;
  out1[15] = x31;
  out1[16] = x32;
  out1[17] = x34;
  out1[18] = x36;
  out1[19] = x37;
  out1[20] = x38;
  out1[21] = x40;
  out1[22] = x42;
  out1[23] = x43;
  out1[24] = x44;
  out1[25] = x46;
  out1[26] = x48;
  out1[27] = x49;
}
```