user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<add_alpha_channel_to_RGB_image>:
  endbr64
  imul   %edx,%esi
  push   %r14
  push   %r12
  push   %rbp
  push   %rbx
  lea    0x0(,%rsi,4),%ebp
  mov    %rdi,%rbx
  mov    %ebp,%edi
  sub    $0x398,%rsp
  call   <malloc@plt>
  mov    %rax,%r8
  test   %ebp,%ebp
  jle    L37
  lea    -0x1(%rbp),%edx
  mov    %edx,%r10d
  shr    $0x2,%r10d
  lea    0x1(%r10),%eax
  lea    (%r8,%rax,4),%rcx
  mov    %rax,%rdi
  lea    (%rax,%rax,2),%rax
  cmp    %rcx,%rbx
  setae  %cl
  add    %rbx,%rax
  cmp    %rax,%r8
  setae  %al
  or     %al,%cl
  je     L35
  cmp    $0x1b,%edx
  jbe    L35
  cmp    $0x3b,%edx
  jbe    L159
  mov    %edi,%ecx
  mov    %rbx,%rdx
  mov    %r8,%rax
  shr    $0x4,%ecx
  shl    $0x6,%rcx
  add    %r8,%rcx
  nopl   0x0(%rax)
L109:
  movdqu (%rdx),%xmm2
  movdqu 0x10(%rdx),%xmm1
  add    $0x40,%rax
  add    $0x30,%rdx
  movdqu -0x10(%rdx),%xmm0
  movd   %xmm2,%esi
  mov    %sil,-0x40(%rax)
  movaps %xmm2,0x380(%rsp)
  movzbl 0x381(%rsp),%esi
  mov    %sil,-0x3f(%rax)
  movaps %xmm2,0x370(%rsp)
  movzbl 0x372(%rsp),%esi
  mov    %sil,-0x3e(%rax)
  movaps %xmm2,0x360(%rsp)
  movzbl 0x363(%rsp),%esi
  mov    %sil,-0x3c(%rax)
  movaps %xmm2,0x350(%rsp)
  movzbl 0x354(%rsp),%esi
  mov    %sil,-0x3b(%rax)
  movaps %xmm2,0x340(%rsp)
  movzbl 0x345(%rsp),%esi
  mov    %sil,-0x3a(%rax)
  movaps %xmm2,0x330(%rsp)
  movzbl 0x336(%rsp),%esi
  mov    %sil,-0x38(%rax)
  movaps %xmm2,0x320(%rsp)
  movzbl 0x327(%rsp),%esi
  mov    %sil,-0x37(%rax)
  movaps %xmm2,0x310(%rsp)
  movzbl 0x318(%rsp),%esi
  mov    %sil,-0x36(%rax)
  movaps %xmm2,0x300(%rsp)
  movzbl 0x309(%rsp),%esi
  mov    %sil,-0x34(%rax)
  movaps %xmm2,0x2f0(%rsp)
  movzbl 0x2fa(%rsp),%esi
  mov    %sil,-0x33(%rax)
  movaps %xmm2,0x2e0(%rsp)
  movzbl 0x2eb(%rsp),%esi
  mov    %sil,-0x32(%rax)
  movaps %xmm2,0x2d0(%rsp)
  movzbl 0x2dc(%rsp),%esi
  mov    %sil,-0x30(%rax)
  movaps %xmm2,0x2c0(%rsp)
  movzbl 0x2cd(%rsp),%esi
  mov    %sil,-0x2f(%rax)
  movaps %xmm2,0x2b0(%rsp)
  movzbl 0x2be(%rsp),%esi
  mov    %sil,-0x2e(%rax)
  movaps %xmm2,0x2a0(%rsp)
  movzbl 0x2af(%rsp),%esi
  mov    %sil,-0x2c(%rax)
  movd   %xmm1,%esi
  mov    %sil,-0x2b(%rax)
  movaps %xmm1,0x290(%rsp)
  movzbl 0x291(%rsp),%esi
  mov    %sil,-0x2a(%rax)
  movaps %xmm1,0x280(%rsp)
  movzbl 0x282(%rsp),%esi
  mov    %sil,-0x28(%rax)
  movaps %xmm1,0x270(%rsp)
  movzbl 0x273(%rsp),%esi
  mov    %sil,-0x27(%rax)
  movaps %xmm1,0x260(%rsp)
  movzbl 0x264(%rsp),%esi
  mov    %sil,-0x26(%rax)
  movaps %xmm1,0x250(%rsp)
  movzbl 0x255(%rsp),%esi
  mov    %sil,-0x24(%rax)
  movaps %xmm1,0x240(%rsp)
  movzbl 0x246(%rsp),%esi
  mov    %sil,-0x23(%rax)
  movaps %xmm1,0x230(%rsp)
  movzbl 0x237(%rsp),%esi
  mov    %sil,-0x22(%rax)
  movaps %xmm1,0x220(%rsp)
  movzbl 0x228(%rsp),%esi
  mov    %sil,-0x20(%rax)
  movaps %xmm1,0x210(%rsp)
  movzbl 0x219(%rsp),%esi
  mov    %sil,-0x1f(%rax)
  movaps %xmm1,0x200(%rsp)
  movzbl 0x20a(%rsp),%esi
  mov    %sil,-0x1e(%rax)
  movaps %xmm1,0x1f0(%rsp)
  movzbl 0x1fb(%rsp),%esi
  mov    %sil,-0x1c(%rax)
  movaps %xmm1,0x1e0(%rsp)
  movzbl 0x1ec(%rsp),%esi
  mov    %sil,-0x1b(%rax)
  movaps %xmm1,0x1d0(%rsp)
  movzbl 0x1dd(%rsp),%esi
  mov    %sil,-0x1a(%rax)
  movaps %xmm1,0x1c0(%rsp)
  movzbl 0x1ce(%rsp),%esi
  mov    %sil,-0x18(%rax)
  movaps %xmm1,0x1b0(%rsp)
  movzbl 0x1bf(%rsp),%esi
  mov    %sil,-0x17(%rax)
  movd   %xmm0,%esi
  mov    %sil,-0x16(%rax)
  movaps %xmm0,0x1a0(%rsp)
  movzbl 0x1a1(%rsp),%esi
  mov    %sil,-0x14(%rax)
  movaps %xmm0,0x190(%rsp)
  movzbl 0x192(%rsp),%esi
  mov    %sil,-0x13(%rax)
  movaps %xmm0,0x180(%rsp)
  movzbl 0x183(%rsp),%esi
  mov    %sil,-0x12(%rax)
  movaps %xmm0,0x170(%rsp)
  movzbl 0x174(%rsp),%esi
  mov    %sil,-0x10(%rax)
  movaps %xmm0,0x160(%rsp)
  movzbl 0x165(%rsp),%esi
  mov    %sil,-0xf(%rax)
  movaps %xmm0,0x150(%rsp)
  movzbl 0x156(%rsp),%esi
  mov    %sil,-0xe(%rax)
  movaps %xmm0,0x140(%rsp)
  movzbl 0x147(%rsp),%esi
  mov    %sil,-0xc(%rax)
  movaps %xmm0,0x130(%rsp)
  movzbl 0x138(%rsp),%esi
  mov    %sil,-0xb(%rax)
  movaps %xmm0,0x120(%rsp)
  movzbl 0x129(%rsp),%esi
  mov    %sil,-0xa(%rax)
  movaps %xmm0,0x110(%rsp)
  movzbl 0x11a(%rsp),%esi
  mov    %sil,-0x8(%rax)
  movaps %xmm0,0x100(%rsp)
  movzbl 0x10b(%rsp),%esi
  mov    %sil,-0x7(%rax)
  movaps %xmm0,0xf0(%rsp)
  movzbl 0xfc(%rsp),%esi
  mov    %sil,-0x6(%rax)
  movaps %xmm0,0xe0(%rsp)
  movzbl 0xed(%rsp),%esi
  mov    %sil,-0x4(%rax)
  movaps %xmm0,0xd0(%rsp)
  movzbl 0xde(%rsp),%esi
  mov    %sil,-0x3(%rax)
  movaps %xmm0,0xc0(%rsp)
  movzbl 0xcf(%rsp),%esi
  movb   $0xff,-0x3d(%rax)
  mov    %sil,-0x2(%rax)
  movb   $0xff,-0x39(%rax)
  movb   $0xff,-0x35(%rax)
  movb   $0xff,-0x31(%rax)
  movb   $0xff,-0x2d(%rax)
  movb   $0xff,-0x29(%rax)
  movb   $0xff,-0x25(%rax)
  movb   $0xff,-0x21(%rax)
  movb   $0xff,-0x1d(%rax)
  movb   $0xff,-0x19(%rax)
  movb   $0xff,-0x15(%rax)
  movb   $0xff,-0x11(%rax)
  movb   $0xff,-0xd(%rax)
  movb   $0xff,-0x9(%rax)
  movb   $0xff,-0x5(%rax)
  movb   $0xff,-0x1(%rax)
  cmp    %rcx,%rax
  jne    L109
  mov    %edi,%eax
  and    $0xfffffff0,%eax
  lea    0x0(,%rax,4),%r9d
  lea    (%rax,%rax,2),%edx
  cmp    %eax,%edi
  je     L37
L11:
  mov    %r10d,%ecx
  sub    %eax,%ecx
  lea    0x1(%rcx),%r10d
  cmp    $0x6,%ecx
  jbe    L8
  lea    (%rax,%rax,2),%r12
  lea    0x0(,%rax,4),%rcx
  add    %rbx,%r12
  lea    (%r8,%rcx,1),%rax
  lea    0x3(%r8,%rcx,1),%r11
  mov    (%r12),%rdi
  mov    0x8(%r12),%rsi
  mov    0x10(%r12),%r14
  mov    %rdi,%r12
  mov    %dil,(%rax)
  mov    %rdi,%rcx
  shr    $0x10,%r12
  mov    %ch,0x1(%rax)
  mov    %rsi,%rcx
  mov    %r12b,0x2(%rax)
  mov    %rdi,%r12
  shr    $0x18,%r12
  mov    %sil,0xa(%rax)
  mov    %r12b,0x4(%rax)
  mov    %rdi,%r12
  shr    $0x20,%r12
  mov    %ch,0xc(%rax)
  mov    %r14,%rcx
  mov    %r12b,0x5(%rax)
  mov    %rdi,%r12
  shr    $0x28,%r12
  mov    %ch,0x16(%rax)
  mov    %r12b,0x6(%rax)
  mov    %rdi,%r12
  shr    $0x38,%rdi
  mov    %dil,0x9(%rax)
  mov    %rsi,%rdi
  shr    $0x30,%r12
  shr    $0x10,%rdi
  mov    %r12b,0x8(%rax)
  mov    %dil,0xd(%rax)
  mov    %rsi,%rdi
  shr    $0x18,%rdi
  mov    %r14b,0x15(%rax)
  mov    %dil,0xe(%rax)
  mov    %rsi,%rdi
  shr    $0x20,%rdi
  mov    %dil,0x10(%rax)
  mov    %rsi,%rdi
  shr    $0x28,%rdi
  mov    %dil,0x11(%rax)
  mov    %rsi,%rdi
  shr    $0x38,%rsi
  mov    %sil,0x14(%rax)
  mov    %r14,%rsi
  shr    $0x30,%rdi
  shr    $0x10,%rsi
  mov    %dil,0x12(%rax)
  mov    %r14,%rdi
  mov    %sil,0x18(%rax)
  mov    %r14,%rsi
  shr    $0x38,%rdi
  shr    $0x18,%rsi
  mov    %dil,0x1e(%rax)
  mov    %sil,0x19(%rax)
  mov    %r14,%rsi
  shr    $0x20,%rsi
  mov    %sil,0x1a(%rax)
  mov    %r14,%rsi
  shr    $0x28,%rsi
  mov    %sil,0x1c(%rax)
  mov    %r14,%rsi
  shr    $0x30,%rsi
  mov    %sil,0x1d(%rax)
  mov    %r10d,%eax
  and    $0xfffffff8,%eax
  movb   $0xff,(%r11)
  lea    (%rax,%rax,2),%ecx
  movb   $0xff,0x4(%r11)
  lea    (%r9,%rax,4),%r9d
  movb   $0xff,0x8(%r11)
  add    %ecx,%edx
  movb   $0xff,0xc(%r11)
  movb   $0xff,0x10(%r11)
  movb   $0xff,0x14(%r11)
  movb   $0xff,0x18(%r11)
  movb   $0xff,0x1c(%r11)
  cmp    %eax,%r10d
  je     L37
L8:
  movslq %edx,%rcx
  movslq %r9d,%rax
  lea    0x3(%rdx),%esi
  movzbl (%rbx,%rcx,1),%ecx
  mov    %cl,(%r8,%rax,1)
  lea    0x1(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  mov    %cl,0x1(%r8,%rax,1)
  lea    0x2(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  movb   $0xff,0x3(%r8,%rax,1)
  mov    %cl,0x2(%r8,%rax,1)
  lea    0x4(%r9),%eax
  cmp    %eax,%ebp
  jle    L37
  movslq %esi,%rsi
  cltq
  movzbl (%rbx,%rsi,1),%ecx
  lea    0x6(%rdx),%esi
  mov    %cl,(%r8,%rax,1)
  lea    0x4(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  mov    %cl,0x1(%r8,%rax,1)
  lea    0x5(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  movb   $0xff,0x3(%r8,%rax,1)
  mov    %cl,0x2(%r8,%rax,1)
  lea    0x8(%r9),%eax
  cmp    %eax,%ebp
  jle    L37
  movslq %esi,%rsi
  cltq
  movzbl (%rbx,%rsi,1),%ecx
  lea    0x9(%rdx),%esi
  mov    %cl,(%r8,%rax,1)
  lea    0x7(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  mov    %cl,0x1(%r8,%rax,1)
  lea    0x8(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  movb   $0xff,0x3(%r8,%rax,1)
  mov    %cl,0x2(%r8,%rax,1)
  lea    0xc(%r9),%eax
  cmp    %eax,%ebp
  jle    L37
  movslq %esi,%rsi
  cltq
  movzbl (%rbx,%rsi,1),%ecx
  lea    0xc(%rdx),%esi
  mov    %cl,(%r8,%rax,1)
  lea    0xa(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  mov    %cl,0x1(%r8,%rax,1)
  lea    0xb(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  movb   $0xff,0x3(%r8,%rax,1)
  mov    %cl,0x2(%r8,%rax,1)
  lea    0x10(%r9),%eax
  cmp    %eax,%ebp
  jle    L37
  movslq %esi,%rsi
  cltq
  movzbl (%rbx,%rsi,1),%ecx
  lea    0xf(%rdx),%esi
  mov    %cl,(%r8,%rax,1)
  lea    0xd(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  mov    %cl,0x1(%r8,%rax,1)
  lea    0xe(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  movb   $0xff,0x3(%r8,%rax,1)
  mov    %cl,0x2(%r8,%rax,1)
  lea    0x14(%r9),%eax
  cmp    %eax,%ebp
  jle    L37
  movslq %esi,%rsi
  cltq
  add    $0x18,%r9d
  movzbl (%rbx,%rsi,1),%ecx
  lea    0x12(%rdx),%esi
  mov    %cl,(%r8,%rax,1)
  lea    0x10(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  mov    %cl,0x1(%r8,%rax,1)
  lea    0x11(%rdx),%ecx
  movslq %ecx,%rcx
  movzbl (%rbx,%rcx,1),%ecx
  movb   $0xff,0x3(%r8,%rax,1)
  mov    %cl,0x2(%r8,%rax,1)
  cmp    %r9d,%ebp
  jle    L37
  movslq %esi,%rsi
  movslq %r9d,%r9
  movzbl (%rbx,%rsi,1),%eax
  mov    %al,(%r8,%r9,1)
  lea    0x13(%rdx),%eax
  add    $0x14,%edx
  cltq
  movslq %edx,%rdx
  movzbl (%rbx,%rax,1),%eax
  mov    %al,0x1(%r8,%r9,1)
  movzbl (%rbx,%rdx,1),%eax
  movb   $0xff,0x3(%r8,%r9,1)
  mov    %al,0x2(%r8,%r9,1)
L37:
  add    $0x398,%rsp
  mov    %r8,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r14
  ret
  nopl   0x0(%rax,%rax,1)
L35:
  mov    %r8,%rax
  lea    (%r8,%rdi,4),%rcx
  nopw   0x0(%rax,%rax,1)
L53:
  movzbl (%rbx),%edx
  add    $0x4,%rax
  add    $0x3,%rbx
  mov    %dl,-0x4(%rax)
  movzbl -0x2(%rbx),%edx
  mov    %dl,-0x3(%rax)
  movzbl -0x1(%rbx),%edx
  movb   $0xff,-0x1(%rax)
  mov    %dl,-0x2(%rax)
  cmp    %rax,%rcx
  jne    L53
  jmp    L37
L159:
  xor    %eax,%eax
  xor    %edx,%edx
  xor    %r9d,%r9d
  jmp    L11
```

assistant: ```c
char *add_alpha_channel_to_RGB_image(const unsigned char *image, int x, int y) {
  char *alpha_image = malloc(x * y * 4);
  int i, idx = 0;
  for (i = 0; i < x * y * 4; i += 4) {
    alpha_image[i] = image[idx++];
    alpha_image[i + 1] = image[idx++];
    alpha_image[i + 2] = image[idx++];
    alpha_image[i + 3] = 255;
  }
  return alpha_image;
}
```