user: 下面的汇编指令对应的C源代码是什么:

```asm
<SDL_imageFilterBitNegation>:
  endbr64
  push   %r12
  xor    %eax,%eax
  mov    %edx,%r12d
  push   %rbp
  mov    %rsi,%rbp
  push   %rbx
  mov    %rdi,%rbx
  call   <SDL_imageFilterMMXdetect@plt>
  test   %rax,%rax
  je     L52
  cmp    $0x7,%r12d
  jg     L120
L52:
  xor    %edx,%edx
L191:
  cmp    %r12d,%edx
  jae    L122
  mov    %r12d,%ecx
  lea    0x1(%rbx),%rdi
  mov    %rbp,%rsi
  sub    %edx,%ecx
  sub    %rdi,%rsi
  lea    -0x1(%rcx),%eax
  cmp    $0xe,%rsi
  jbe    L139
  cmp    $0x6,%eax
  jbe    L139
  cmp    $0xe,%eax
  jbe    L19
  mov    %ecx,%esi
  xor    %eax,%eax
  pcmpeqd %xmm1,%xmm1
  shr    $0x4,%esi
  shl    $0x4,%rsi
  nop
L94:
  movdqu (%rbx,%rax,1),%xmm0
  pxor   %xmm1,%xmm0
  movups %xmm0,0x0(%rbp,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%rsi
  jne    L94
  mov    %ecx,%r8d
  and    $0xfffffff0,%r8d
  mov    %r8d,%edi
  add    %r8d,%edx
  lea    (%rbx,%rdi,1),%rsi
  lea    0x0(%rbp,%rdi,1),%rax
  cmp    %r8d,%ecx
  je     L122
  sub    %r8d,%ecx
  lea    -0x1(%rcx),%r8d
  cmp    $0x6,%r8d
  jbe    L158
L166:
  movq   D8(%rip),%xmm1
  movq   (%rbx,%rdi,1),%xmm0
  pxor   %xmm1,%xmm0
  movq   %xmm0,0x0(%rbp,%rdi,1)
  mov    %ecx,%edi
  and    $0xfffffff8,%edi
  mov    %edi,%r8d
  add    %edi,%edx
  add    %r8,%rsi
  add    %r8,%rax
  cmp    %edi,%ecx
  je     L122
L158:
  movzbl (%rsi),%ecx
  not    %ecx
  mov    %cl,(%rax)
  lea    0x1(%rdx),%ecx
  cmp    %ecx,%r12d
  jbe    L122
  movzbl 0x1(%rsi),%ecx
  not    %ecx
  mov    %cl,0x1(%rax)
  lea    0x2(%rdx),%ecx
  cmp    %ecx,%r12d
  jbe    L122
  movzbl 0x2(%rsi),%ecx
  not    %ecx
  mov    %cl,0x2(%rax)
  lea    0x3(%rdx),%ecx
  cmp    %ecx,%r12d
  jbe    L122
  movzbl 0x3(%rsi),%ecx
  not    %ecx
  mov    %cl,0x3(%rax)
  lea    0x4(%rdx),%ecx
  cmp    %ecx,%r12d
  jbe    L122
  movzbl 0x4(%rsi),%ecx
  not    %ecx
  mov    %cl,0x4(%rax)
  lea    0x5(%rdx),%ecx
  cmp    %ecx,%r12d
  jbe    L122
  movzbl 0x5(%rsi),%ecx
  add    $0x6,%edx
  not    %ecx
  mov    %cl,0x5(%rax)
  cmp    %edx,%r12d
  jbe    L122
  movzbl 0x6(%rsi),%edx
  not    %edx
  mov    %dl,0x6(%rax)
L122:
  pop    %rbx
  xor    %eax,%eax
  pop    %rbp
  pop    %r12
  ret
  nopw   0x0(%rax,%rax,1)
L120:
  mov    %r12d,%edx
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <SDL_imageFilterBitNegationMMX@plt>
  test   $0x7,%r12b
  je     L122
  mov    %r12d,%edx
  and    $0xfffffff8,%edx
  mov    %edx,%eax
  add    %rax,%rbx
  add    %rax,%rbp
  jmp    L191
  nop
L139:
  sub    $0x1,%r12d
  xor    %eax,%eax
  sub    %edx,%r12d
  nopl   0x0(%rax)
L47:
  movzbl (%rbx,%rax,1),%edx
  not    %edx
  mov    %dl,0x0(%rbp,%rax,1)
  mov    %rax,%rdx
  add    $0x1,%rax
  cmp    %r12,%rdx
  jne    L47
  pop    %rbx
  xor    %eax,%eax
  pop    %rbp
  pop    %r12
  ret
L19:
  mov    %rbp,%rax
  mov    %rbx,%rsi
  xor    %edi,%edi
  jmp    L166
```

tool_calls: name: unpack_data
arguments: tag: D8
data_type: byte[8]

tool: {"D8": [0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff]}

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