user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<SDL_imageFilterSub>:
  endbr64
  push   %r13
  xor    %eax,%eax
  mov    %rdx,%r13
  push   %r12
  mov    %ecx,%r12d
  push   %rbp
  mov    %rsi,%rbp
  push   %rbx
  mov    %rdi,%rbx
  sub    $0x8,%rsp
  call   <SDL_imageFilterMMXdetect@plt>
  test   %rax,%rax
  je     L11
  cmp    $0x7,%r12d
  jg     L150
L11:
  xor    %ecx,%ecx
L140:
  cmp    %r12d,%ecx
  jae    L180
  lea    0x1(%rbp),%rdx
  mov    %r13,%rax
  lea    0x1(%rbx),%rdi
  mov    %r12d,%esi
  sub    %rdx,%rax
  sub    %ecx,%esi
  cmp    $0xe,%rax
  mov    %r13,%rax
  seta   %dl
  sub    %rdi,%rax
  cmp    $0xe,%rax
  seta   %al
  test   %al,%dl
  je     L56
  lea    -0x1(%rsi),%eax
  cmp    $0xe,%eax
  jbe    L56
  mov    %esi,%edx
  movdqa D0(%rip),%xmm5
  xor    %eax,%eax
  pxor   %xmm3,%xmm3
  shr    $0x4,%edx
  pxor   %xmm4,%xmm4
  shl    $0x4,%rdx
  nopl   0x0(%rax)
L116:
  movdqu (%rbx,%rax,1),%xmm0
  movdqu 0x0(%rbp,%rax,1),%xmm2
  movdqa %xmm0,%xmm1
  movdqa %xmm2,%xmm6
  punpckhbw %xmm3,%xmm0
  punpcklbw %xmm3,%xmm1
  punpcklbw %xmm3,%xmm6
  punpckhbw %xmm3,%xmm2
  psubw  %xmm6,%xmm1
  psubw  %xmm2,%xmm0
  pmaxsw %xmm4,%xmm1
  pmaxsw %xmm4,%xmm0
  pand   %xmm5,%xmm1
  pand   %xmm5,%xmm0
  packuswb %xmm0,%xmm1
  movups %xmm1,0x0(%r13,%rax,1)
  add    $0x10,%rax
  cmp    %rdx,%rax
  jne    L116
  mov    %esi,%edi
  lea    0x1(%rcx),%eax
  and    $0xfffffff0,%edi
  mov    %edi,%edx
  add    %rdx,%rbx
  add    %rdx,%rbp
  add    %r13,%rdx
  cmp    %edi,%esi
  je     L180
  movzbl 0x0(%rbp),%ecx
  movzbl (%rbx),%esi
  sub    %ecx,%esi
  mov    $0x0,%ecx
  cmovs  %ecx,%esi
  add    %edi,%eax
  mov    %sil,(%rdx)
  cmp    %eax,%r12d
  jbe    L180
  movzbl 0x1(%rbp),%esi
  movzbl 0x1(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0x1(%rdx)
  lea    0x1(%rax),%ecx
  cmp    %r12d,%ecx
  jae    L180
  movzbl 0x2(%rbp),%esi
  movzbl 0x2(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0x2(%rdx)
  lea    0x2(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0x3(%rbp),%esi
  movzbl 0x3(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0x3(%rdx)
  lea    0x3(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0x4(%rbp),%esi
  movzbl 0x4(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0x4(%rdx)
  lea    0x4(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0x5(%rbp),%esi
  movzbl 0x5(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0x5(%rdx)
  lea    0x5(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0x6(%rbp),%esi
  movzbl 0x6(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0x6(%rdx)
  lea    0x6(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0x7(%rbp),%esi
  movzbl 0x7(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0x7(%rdx)
  lea    0x7(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0x8(%rbp),%esi
  movzbl 0x8(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0x8(%rdx)
  lea    0x8(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0x9(%rbp),%esi
  movzbl 0x9(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0x9(%rdx)
  lea    0x9(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0xa(%rbp),%esi
  movzbl 0xa(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0xa(%rdx)
  lea    0xa(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0xb(%rbp),%esi
  movzbl 0xb(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0xb(%rdx)
  lea    0xb(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0xc(%rbp),%esi
  movzbl 0xc(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  mov    %cl,0xc(%rdx)
  lea    0xc(%rax),%ecx
  cmp    %ecx,%r12d
  jbe    L180
  movzbl 0xd(%rbp),%esi
  movzbl 0xd(%rbx),%ecx
  sub    %esi,%ecx
  mov    $0x0,%esi
  cmovs  %esi,%ecx
  add    $0xd,%eax
  mov    %cl,0xd(%rdx)
  cmp    %eax,%r12d
  jbe    L180
  movzbl 0xe(%rbp),%ecx
  movzbl 0xe(%rbx),%eax
  sub    %ecx,%eax
  mov    $0x0,%ecx
  cmovs  %ecx,%eax
  mov    %al,0xe(%rdx)
L180:
  add    $0x8,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
  nop
L150:
  mov    %r12d,%ecx
  mov    %r13,%rdx
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <SDL_imageFilterSubMMX@plt>
  test   $0x7,%r12b
  je     L180
  mov    %r12d,%ecx
  and    $0xfffffff8,%ecx
  mov    %ecx,%eax
  add    %rax,%rbx
  add    %rax,%rbp
  add    %rax,%r13
  jmp    L140
  nopl   (%rax)
L56:
  sub    $0x1,%r12d
  xor    %edx,%edx
  sub    %ecx,%r12d
  nopl   0x0(%rax)
L214:
  movzbl 0x0(%rbp,%rdx,1),%ecx
  movzbl (%rbx,%rdx,1),%eax
  sub    %ecx,%eax
  mov    $0x0,%ecx
  cmovs  %ecx,%eax
  mov    %al,0x0(%r13,%rdx,1)
  mov    %rdx,%rax
  add    $0x1,%rdx
  cmp    %rax,%r12
  jne    L214
  add    $0x8,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
```

tool_calls: name: extract_symbolic_data
arguments: data_tag: D0
type: byte[16]

tool: {"D0": [0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00]}

assistant: ```c
int SDL_imageFilterSub(unsigned char *Src1, unsigned char *Src2, unsigned char *Dest, int length) {
  unsigned int i, istart;
  unsigned char *cursrc1, *cursrc2, *curdst;
  int result;
  if ((SDL_imageFilterMMXdetect()) && (length > 7)) {
    SDL_imageFilterSubMMX(Src1, Src2, Dest, length);
    if ((length & 7) > 0) {
      istart = length & 0xfffffff8;
      cursrc1 = &Src1[istart];
      cursrc2 = &Src2[istart];
      curdst = &Dest[istart];
    } else {
      return (0);
    }
  } else {
    istart = 0;
    cursrc1 = Src1;
    cursrc2 = Src2;
    curdst = Dest;
  }
  for (i = istart; i < length; i++) {
    result = (int)*cursrc1 - (int)*cursrc2;
    if (result < 0)
      result = 0;
    *curdst = (unsigned char)result;
    cursrc1++;
    cursrc2++;
    curdst++;
  }
  return (0);
}
```