user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<png_defilter>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %rdi,%rbp
  mov    %rsi,%rbx
  mov    %edx,%edi
  mov    %ecx,0xc(%rsp)
  mov    %r8d,%r12d
  mov    %r9d,%r13d
  mov    %r9d,%edx
  mov    %r8d,%esi
  call   <png_get_scanline_len@plt>
  mov    %eax,0x8(%rsp)
  movl   $0xffffffff,0x10(%rsp)
  cmp    $0x7,%r12d
  jle    L248
  lea    0x7(%r12),%eax
  test   %r12d,%r12d
  cmovns %r12d,%eax
  sar    $0x3,%eax
  neg    %eax
  imul   %r13d,%eax
  mov    %eax,0x10(%rsp)
L248:
  mov    0x8(%rsp),%eax
  mov    %eax,%esi
  neg    %esi
  mov    %esi,0x14(%rsp)
  cmpl   $0x0,0xc(%rsp)
  jle    L258
  mov    $0x0,%r15d
  mov    0x10(%rsp),%edi
  mov    %edi,%esi
  add    %eax,%esi
  mov    %esi,0x1c(%rsp)
  sub    %eax,%edi
  mov    %edi,0x18(%rsp)
  jmp    L405
L319:
  mov    0x8(%rsp),%eax
  cmp    $0x1,%eax
  jle    L443
  mov    %eax,%ecx
  mov    $0x1,%eax
L6:
  movzbl 0x0(%rbp,%rax,1),%edx
  mov    %dl,(%rbx,%rax,1)
  add    $0x1,%rax
  cmp    %rcx,%rax
  jne    L6
  mov    0x8(%rsp),%eax
  lea    -0x1(%rax),%ebx
  lea    0x0(%r13,%rbx,1),%rbp
  add    %r14,%rbx
L356:
  add    $0x1,%r15d
  cmp    %r15d,0xc(%rsp)
  je     L258
L405:
  lea    0x1(%rbp),%r13
  movzbl 0x0(%rbp),%eax
  lea    0x1(%rbx),%r14
  mov    %al,(%rbx)
  test   %al,%al
  je     L319
  cmp    $0x1,%al
  je     L324
  cmp    $0x2,%al
  je     L26
  cmp    $0x3,%al
  je     L439
  mov    %r14,%rbx
  mov    %r13,%rbp
  cmp    $0x4,%al
  jne    L356
  cmpl   $0x1,0x8(%rsp)
  jle    L356
  mov    0x10(%rsp),%eax
  lea    0x1(%rax),%ebx
  mov    %r14,%rbp
  mov    %r13,0x20(%rsp)
  mov    %r14,0x28(%rsp)
  mov    0x1c(%rsp),%r14d
  jmp    L200
L324:
  mov    0x8(%rsp),%eax
  cmp    $0x1,%eax
  jle    L305
  mov    %eax,%edi
  mov    $0x1,%eax
  mov    $0x0,%esi
  mov    0x10(%rsp),%r9d
  movslq %r9d,%r8
  add    %rbx,%r8
  jmp    L331
L254:
  add    0x0(%rbp,%rax,1),%dl
  mov    %dl,(%rbx,%rax,1)
  add    $0x1,%rax
  cmp    %rdi,%rax
  je     L179
L331:
  lea    (%r9,%rax,1),%ecx
  mov    %esi,%edx
  test   %ecx,%ecx
  jle    L254
  movzbl (%r8,%rax,1),%edx
  jmp    L254
L179:
  mov    0x8(%rsp),%eax
  lea    -0x1(%rax),%ebx
  lea    0x0(%r13,%rbx,1),%rbp
  add    %r14,%rbx
  jmp    L356
L26:
  mov    0x8(%rsp),%eax
  cmp    $0x1,%eax
  jle    L339
  mov    %eax,%esi
  mov    $0x1,%eax
  mov    $0x0,%ecx
  movslq 0x14(%rsp),%rdi
  add    %rbx,%rdi
  jmp    L146
L143:
  add    0x0(%rbp,%rax,1),%dl
  mov    %dl,(%rbx,%rax,1)
  add    $0x1,%rax
  cmp    %rsi,%rax
  je     L116
L146:
  mov    %ecx,%edx
  test   %r15d,%r15d
  jle    L143
  movzbl (%rdi,%rax,1),%edx
  jmp    L143
L116:
  mov    0x8(%rsp),%eax
  lea    -0x1(%rax),%ebx
  lea    0x0(%r13,%rbx,1),%rbp
  add    %r14,%rbx
  jmp    L356
L439:
  mov    0x8(%rsp),%eax
  cmp    $0x1,%eax
  jle    L438
  mov    %eax,%esi
  mov    $0x1,%edx
  mov    $0x0,%ecx
  mov    0x10(%rsp),%r9d
  movslq %r9d,%r8
  add    %rbx,%r8
  movslq 0x14(%rsp),%rdi
  add    %rbx,%rdi
  jmp    L394
L86:
  mov    %ecx,%r10d
  test   %r15d,%r15d
  jle    L91
  movzbl (%rdi,%rdx,1),%r10d
L91:
  add    %r10d,%eax
  shr    %eax
  add    0x0(%rbp,%rdx,1),%al
  mov    %al,(%rbx,%rdx,1)
  add    $0x1,%rdx
  cmp    %rsi,%rdx
  je     L410
L394:
  lea    (%r9,%rdx,1),%r10d
  mov    %ecx,%eax
  test   %r10d,%r10d
  jle    L86
  movzbl (%r8,%rdx,1),%eax
  jmp    L86
L410:
  mov    0x8(%rsp),%eax
  lea    -0x1(%rax),%ebx
  lea    0x0(%r13,%rbx,1),%rbp
  add    %r14,%rbx
  jmp    L356
L316:
  test   %r15d,%r15d
  jle    L50
  movslq 0x14(%rsp),%rdx
  movzbl 0x0(%rbp,%rdx,1),%esi
  test   %ebx,%ebx
  jg     L104
  mov    $0x0,%edi
  mov    $0x0,%edx
  jmp    L198
L104:
  mov    $0x0,%edi
L190:
  movslq 0x18(%rsp),%rax
  movzbl 0x0(%rbp,%rax,1),%edx
L198:
  add    $0x1,%r13
  movzbl -0x1(%r13),%r12d
  call   <png_paeth_predictor@plt>
  add    $0x1,%rbp
  add    %eax,%r12d
  mov    %r12b,-0x1(%rbp)
  add    $0x1,%ebx
  cmp    %r14d,%ebx
  je     L277
L200:
  test   %ebx,%ebx
  jle    L316
  movslq 0x10(%rsp),%rax
  movzbl 0x0(%rbp,%rax,1),%edi
  mov    $0x0,%esi
  mov    $0x0,%edx
  test   %r15d,%r15d
  jle    L198
  movslq 0x14(%rsp),%rax
  movzbl 0x0(%rbp,%rax,1),%esi
  jmp    L190
L50:
  mov    $0x0,%edi
  mov    $0x0,%esi
  mov    $0x0,%edx
  jmp    L198
L277:
  mov    0x20(%rsp),%r13
  mov    0x28(%rsp),%r14
  mov    0x8(%rsp),%eax
  lea    -0x1(%rax),%ebx
  lea    0x0(%r13,%rbx,1),%rbp
  add    %r14,%rbx
  jmp    L356
L443:
  mov    %r14,%rbx
  mov    %r13,%rbp
  jmp    L356
L305:
  mov    %r14,%rbx
  mov    %r13,%rbp
  jmp    L356
L339:
  mov    %r14,%rbx
  mov    %r13,%rbp
  jmp    L356
L438:
  mov    %r14,%rbx
  mov    %r13,%rbp
  jmp    L356
L258:
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void png_defilter(const unsigned char *data, unsigned char *image, int width, int height, int depth, int sample_per_pixel) {
  unsigned char type;
  int i, j;
  int ap, bp;
  unsigned int a, b, c, k;
  int scanline_len;
  scanline_len = png_get_scanline_len(width, depth, sample_per_pixel);
  if (depth < 8)
    ap = -1;
  else
    ap = -(depth / 8 * sample_per_pixel);
  bp = -scanline_len;
  for (i = 0; i < height; i++) {
    { type = (uint8_t) * (data)++; };
    *image++ = type;
    if (type == 0) {
      for (j = 1; j < scanline_len; j++) {
        { k = (uint8_t) * (data)++; };
        *image++ = k;
      }
    } else if (type == 1) {
      for (j = 1; j < scanline_len; j++) {
        a = (j + ap > 0) ? image[ap] : 0;
        { k = (uint8_t) * (data)++; };
        *image++ = k + a;
      }
    } else if (type == 2) {
      for (j = 1; j < scanline_len; j++) {
        b = (i > 0) ? image[bp] : 0;
        { k = (uint8_t) * (data)++; };
        *image++ = k + b;
      }
    } else if (type == 3) {
      for (j = 1; j < scanline_len; j++) {
        a = (j + ap > 0) ? image[ap] : 0;
        b = (i > 0) ? image[bp] : 0;
        { k = (uint8_t) * (data)++; };
        *image++ = k + (a + b) / 2;
      }
    } else if (type == 4) {
      for (j = 1; j < scanline_len; j++) {
        a = (j + ap > 0) ? image[ap] : 0;
        b = (i > 0) ? image[bp] : 0;
        c = (i > 0 && j + ap > 0) ? image[ap + bp] : 0;
        { k = (uint8_t) * (data)++; };
        *image++ = k + png_paeth_predictor(a, b, c);
      }
    }
  }
}
```