user: 这段汇编代码用C语言表示是什么样的？

```asm
<fiat_p256_to_bytes>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x88,%rsp
  mov    (%rsi),%r14d
  mov    0xc(%rsi),%r12d
  mov    0x8(%rsi),%ebx
  mov    0x4(%rsi),%ebp
  mov    %rdi,0x78(%rsp)
  mov    $0xff,%edi
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %r14d,%r15d
  and    %r14d,%eax
  sar    $0x10,%r15d
  mov    %eax,%r13d
  call   <UINT8_C@plt>
  mov    %r14d,%ecx
  mov    $0xff,%edi
  sar    $0x8,%ecx
  and    %eax,%ecx
  mov    %ecx,(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %eax,%r15d
  call   <UINT8_C@plt>
  movd   %r15d,%xmm0
  movd   %r13d,%xmm7
  mov    %ebp,%r15d
  mov    %eax,%r8d
  mov    %r14d,%eax
  mov    $0xff,%edi
  sar    $0x1f,%r14d
  sar    $0x18,%eax
  sar    $0x8,%r15d
  and    %r8d,%eax
  movd   %eax,%xmm4
  punpckldq %xmm4,%xmm0
  movd   (%rsp),%xmm4
  punpckldq %xmm4,%xmm7
  punpcklqdq %xmm0,%xmm7
  movaps %xmm7,0x60(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,%r13d
  call   <UINT8_C@plt>
  and    %r14d,%r13d
  mov    $0xff,%edi
  and    %r14d,%eax
  movslq %r13d,%rsi
  cltq
  movq   %rsi,%xmm8
  movq   %rax,%xmm5
  punpcklqdq %xmm5,%xmm8
  movaps %xmm8,0x50(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,%r13d
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %ebp,%eax
  mov    %eax,(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %eax,%r15d
  call   <UINT8_C@plt>
  movd   (%rsp),%xmm5
  movd   %r15d,%xmm0
  movd   %r14d,%xmm3
  mov    %eax,%r8d
  mov    %ebp,%eax
  mov    $0xff,%edi
  sar    $0x10,%eax
  punpckldq %xmm5,%xmm3
  and    %r8d,%eax
  movd   %eax,%xmm4
  punpckldq %xmm4,%xmm0
  punpcklqdq %xmm0,%xmm3
  movaps %xmm3,0x40(%rsp)
  call   <UINT8_C@plt>
  mov    %ebp,%ecx
  mov    $0xff,%edi
  sar    $0x1f,%ebp
  sar    $0x18,%ecx
  and    %eax,%ecx
  mov    %ecx,(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %ebp,%eax
  mov    %eax,0x10(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,%r15d
  call   <UINT8_C@plt>
  and    %ebp,%r15d
  movd   0x10(%rsp),%xmm5
  movd   (%rsp),%xmm6
  and    %ebp,%eax
  movd   %r15d,%xmm0
  mov    $0xff,%edi
  mov    %ebx,%r15d
  movd   %eax,%xmm4
  punpckldq %xmm5,%xmm6
  sar    $0x8,%r15d
  punpckldq %xmm4,%xmm0
  punpcklqdq %xmm0,%xmm6
  movaps %xmm6,0x30(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %ebx,%eax
  mov    %eax,(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %eax,%r15d
  call   <UINT8_C@plt>
  movd   (%rsp),%xmm4
  movd   %r15d,%xmm0
  movd   %ebp,%xmm1
  mov    %eax,%r8d
  mov    %ebx,%eax
  mov    $0xff,%edi
  mov    %ebx,%ebp
  sar    $0x10,%eax
  punpckldq %xmm4,%xmm1
  sar    $0x18,%ebp
  and    %r8d,%eax
  sar    $0x1f,%ebx
  movd   %eax,%xmm6
  punpckldq %xmm6,%xmm0
  punpcklqdq %xmm0,%xmm1
  movaps %xmm1,0x20(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %eax,%ebp
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %ebx,%eax
  mov    %eax,(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  mov    %eax,%r15d
  call   <UINT8_C@plt>
  and    %ebx,%r15d
  movd   (%rsp),%xmm6
  mov    $0xff,%edi
  and    %ebx,%eax
  movd   %r15d,%xmm0
  movd   %eax,%xmm5
  punpckldq %xmm5,%xmm0
  movd   %ebp,%xmm5
  mov    %r12d,%ebp
  punpckldq %xmm6,%xmm5
  sar    $0x8,%ebp
  punpcklqdq %xmm0,%xmm5
  movaps %xmm5,0x10(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %r12d,%eax
  mov    %eax,%r15d
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %eax,%ebp
  call   <UINT8_C@plt>
  movd   %r15d,%xmm5
  movd   %ebp,%xmm2
  movd   %ebx,%xmm0
  mov    %eax,%r8d
  mov    %r12d,%eax
  punpckldq %xmm5,%xmm0
  mov    $0xff,%edi
  sar    $0x10,%eax
  mov    %r12d,%ebx
  and    %r8d,%eax
  sar    $0x18,%ebx
  movd   %eax,%xmm4
  punpckldq %xmm4,%xmm2
  punpcklqdq %xmm2,%xmm0
  movaps %xmm0,(%rsp)
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %eax,%ebx
  sar    $0x1f,%r12d
  and    %r14d,%r13d
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  movslq %r13d,%r13
  and    %r12d,%eax
  mov    %eax,%r15d
  call   <UINT8_C@plt>
  mov    $0xff,%edi
  and    %r12d,%eax
  mov    %eax,%ebp
  call   <UINT8_C@plt>
  movd   %r15d,%xmm5
  movd   %ebp,%xmm2
  movd   %ebx,%xmm4
  and    %r12d,%eax
  punpckldq %xmm5,%xmm4
  mov    0x78(%rsp),%rdx
  movdqa 0x60(%rsp),%xmm7
  movd   %eax,%xmm6
  movdqa 0x40(%rsp),%xmm3
  movslq %r12d,%r12
  movdqa 0x50(%rsp),%xmm8
  punpckldq %xmm6,%xmm2
  movdqa %xmm7,%xmm10
  mov    %r13,0x30(%rdx)
  movdqa 0x30(%rsp),%xmm6
  punpcklqdq %xmm2,%xmm4
  pxor   %xmm2,%xmm2
  movups %xmm8,0x20(%rdx)
  movdqa %xmm3,%xmm8
  movdqa %xmm2,%xmm9
  movdqa 0x20(%rsp),%xmm1
  movdqa 0x10(%rsp),%xmm5
  mov    %r12,0xf8(%rdx)
  pcmpgtd %xmm7,%xmm9
  movdqa (%rsp),%xmm0
  punpckhdq %xmm9,%xmm7
  punpckldq %xmm9,%xmm10
  movups %xmm7,0x10(%rdx)
  movdqa %xmm2,%xmm7
  pcmpgtd %xmm3,%xmm7
  movups %xmm10,(%rdx)
  punpckhdq %xmm7,%xmm3
  punpckldq %xmm7,%xmm8
  movdqa %xmm6,%xmm7
  movups %xmm3,0x48(%rdx)
  movdqa %xmm2,%xmm3
  pcmpgtd %xmm6,%xmm3
  movups %xmm8,0x38(%rdx)
  punpckhdq %xmm3,%xmm6
  punpckldq %xmm3,%xmm7
  movdqa %xmm1,%xmm3
  movups %xmm6,0x68(%rdx)
  movdqa %xmm2,%xmm6
  pcmpgtd %xmm1,%xmm6
  movups %xmm7,0x58(%rdx)
  punpckldq %xmm6,%xmm3
  punpckhdq %xmm6,%xmm1
  movups %xmm3,0x78(%rdx)
  movdqa %xmm2,%xmm3
  pcmpgtd %xmm5,%xmm3
  movups %xmm1,0x88(%rdx)
  movdqa %xmm5,%xmm1
  punpckldq %xmm3,%xmm1
  punpckhdq %xmm3,%xmm5
  movdqa %xmm2,%xmm3
  pcmpgtd %xmm0,%xmm3
  movups %xmm1,0x98(%rdx)
  pcmpgtd %xmm4,%xmm2
  movdqa %xmm0,%xmm1
  movups %xmm5,0xa8(%rdx)
  punpckldq %xmm3,%xmm1
  movups %xmm1,0xb8(%rdx)
  movdqa %xmm0,%xmm1
  movdqa %xmm4,%xmm0
  punpckhdq %xmm2,%xmm4
  punpckhdq %xmm3,%xmm1
  punpckldq %xmm2,%xmm0
  movups %xmm4,0xe8(%rdx)
  movups %xmm1,0xc8(%rdx)
  movups %xmm0,0xd8(%rdx)
  add    $0x88,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void fiat_p256_to_bytes(uint8_t out1[32], const uint64_t arg1[4]) {
  uint64_t x1;
  uint64_t x2;
  uint64_t x3;
  uint64_t x4;
  uint8_t x5;
  uint64_t x6;
  uint8_t x7;
  uint64_t x8;
  uint8_t x9;
  uint64_t x10;
  uint8_t x11;
  uint64_t x12;
  uint8_t x13;
  uint64_t x14;
  uint8_t x15;
  uint64_t x16;
  uint8_t x17;
  uint8_t x18;
  uint8_t x19;
  uint64_t x20;
  uint8_t x21;
  uint64_t x22;
  uint8_t x23;
  uint64_t x24;
  uint8_t x25;
  uint64_t x26;
  uint8_t x27;
  uint64_t x28;
  uint8_t x29;
  uint64_t x30;
  uint8_t x31;
  uint8_t x32;
  uint8_t x33;
  uint64_t x34;
  uint8_t x35;
  uint64_t x36;
  uint8_t x37;
  uint64_t x38;
  uint8_t x39;
  uint64_t x40;
  uint8_t x41;
  uint64_t x42;
  uint8_t x43;
  uint64_t x44;
  uint8_t x45;
  uint8_t x46;
  uint8_t x47;
  uint64_t x48;
  uint8_t x49;
  uint64_t x50;
  uint8_t x51;
  uint64_t x52;
  uint8_t x53;
  uint64_t x54;
  uint8_t x55;
  uint64_t x56;
  uint8_t x57;
  uint64_t x58;
  uint8_t x59;
  uint8_t x60;
  x1 = (arg1[3]);
  x2 = (arg1[2]);
  x3 = (arg1[1]);
  x4 = (arg1[0]);
  x5 = (uint8_t)(x4 & UINT8_C(0xff));
  x6 = (x4 >> 8);
  x7 = (uint8_t)(x6 & UINT8_C(0xff));
  x8 = (x6 >> 8);
  x9 = (uint8_t)(x8 & UINT8_C(0xff));
  x10 = (x8 >> 8);
  x11 = (uint8_t)(x10 & UINT8_C(0xff));
  x12 = (x10 >> 8);
  x13 = (uint8_t)(x12 & UINT8_C(0xff));
  x14 = (x12 >> 8);
  x15 = (uint8_t)(x14 & UINT8_C(0xff));
  x16 = (x14 >> 8);
  x17 = (uint8_t)(x16 & UINT8_C(0xff));
  x18 = (uint8_t)(x16 >> 8);
  x19 = (uint8_t)(x3 & UINT8_C(0xff));
  x20 = (x3 >> 8);
  x21 = (uint8_t)(x20 & UINT8_C(0xff));
  x22 = (x20 >> 8);
  x23 = (uint8_t)(x22 & UINT8_C(0xff));
  x24 = (x22 >> 8);
  x25 = (uint8_t)(x24 & UINT8_C(0xff));
  x26 = (x24 >> 8);
  x27 = (uint8_t)(x26 & UINT8_C(0xff));
  x28 = (x26 >> 8);
  x29 = (uint8_t)(x28 & UINT8_C(0xff));
  x30 = (x28 >> 8);
  x31 = (uint8_t)(x30 & UINT8_C(0xff));
  x32 = (uint8_t)(x30 >> 8);
  x33 = (uint8_t)(x2 & UINT8_C(0xff));
  x34 = (x2 >> 8);
  x35 = (uint8_t)(x34 & UINT8_C(0xff));
  x36 = (x34 >> 8);
  x37 = (uint8_t)(x36 & UINT8_C(0xff));
  x38 = (x36 >> 8);
  x39 = (uint8_t)(x38 & UINT8_C(0xff));
  x40 = (x38 >> 8);
  x41 = (uint8_t)(x40 & UINT8_C(0xff));
  x42 = (x40 >> 8);
  x43 = (uint8_t)(x42 & UINT8_C(0xff));
  x44 = (x42 >> 8);
  x45 = (uint8_t)(x44 & UINT8_C(0xff));
  x46 = (uint8_t)(x44 >> 8);
  x47 = (uint8_t)(x1 & UINT8_C(0xff));
  x48 = (x1 >> 8);
  x49 = (uint8_t)(x48 & UINT8_C(0xff));
  x50 = (x48 >> 8);
  x51 = (uint8_t)(x50 & UINT8_C(0xff));
  x52 = (x50 >> 8);
  x53 = (uint8_t)(x52 & UINT8_C(0xff));
  x54 = (x52 >> 8);
  x55 = (uint8_t)(x54 & UINT8_C(0xff));
  x56 = (x54 >> 8);
  x57 = (uint8_t)(x56 & UINT8_C(0xff));
  x58 = (x56 >> 8);
  x59 = (uint8_t)(x58 & UINT8_C(0xff));
  x60 = (uint8_t)(x58 >> 8);
  out1[0] = x5;
  out1[1] = x7;
  out1[2] = x9;
  out1[3] = x11;
  out1[4] = x13;
  out1[5] = x15;
  out1[6] = x17;
  out1[7] = x18;
  out1[8] = x19;
  out1[9] = x21;
  out1[10] = x23;
  out1[11] = x25;
  out1[12] = x27;
  out1[13] = x29;
  out1[14] = x31;
  out1[15] = x32;
  out1[16] = x33;
  out1[17] = x35;
  out1[18] = x37;
  out1[19] = x39;
  out1[20] = x41;
  out1[21] = x43;
  out1[22] = x45;
  out1[23] = x46;
  out1[24] = x47;
  out1[25] = x49;
  out1[26] = x51;
  out1[27] = x53;
  out1[28] = x55;
  out1[29] = x57;
  out1[30] = x59;
  out1[31] = x60;
}
```