user: 下面的汇编指令对应的C源代码是什么:

```asm
<goodv>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rsi,-0x8(%rsp)
  mov    %edx,-0x40(%rsp)
  mov    %ecx,-0x4c(%rsp)
  test   %ecx,%ecx
  jle    L34
  mov    %ecx,%eax
  lea    -0x1(%rdx),%ecx
  lea    0x50(%rdi),%r14
  movq   $0x0,-0x48(%rsp)
  sub    $0x1,%eax
  movl   $0x0,-0x18(%rsp)
  mov    %r14,%r15
  mov    %rdi,%r14
  mov    %eax,-0x10(%rsp)
  movslq %edx,%rax
  movl   $0x0,-0x50(%rsp)
  mov    %ecx,-0x14(%rsp)
  mov    %rax,-0x58(%rsp)
  xchg   %ax,%ax
L159:
  mov    -0x50(%rsp),%eax
  mov    %r15,%r12
  xor    %r13d,%r13d
  movd   %eax,%xmm0
  add    $0x1,%eax
  mov    %eax,-0x50(%rsp)
  mov    -0x48(%rsp),%eax
  mov    %eax,-0x3c(%rsp)
  mov    -0x40(%rsp),%eax
  test   %eax,%eax
  jg     L40
  jmp    L59
  nopw   0x0(%rax,%rax,1)
L85:
  add    $0x1,%r13
  add    $0x4,%r12
  cmp    -0x58(%rsp),%r13
  je     L59
L40:
  movdqa %xmm0,%xmm1
  movd   %r13d,%xmm2
  mov    %r13d,-0x5c(%rsp)
  mov    0x4(%r14,%r13,4),%eax
  punpckldq %xmm2,%xmm1
  cmp    %eax,(%r15,%r13,4)
  jne    L85
  lea    0x1(%r13),%eax
  cmp    %eax,-0x4c(%rsp)
  jle    L85
  mov    -0x50(%rsp),%ebx
  cmp    %ebx,-0x40(%rsp)
  jle    L85
  mov    %r13d,-0xc(%rsp)
  mov    -0x48(%rsp),%rsi
  cmp    %esi,-0x14(%rsp)
  jle    L135
  cmp    %r13d,-0x10(%rsp)
  jle    L135
  mov    -0x4c(%rsp),%eax
  mov    -0x40(%rsp),%ecx
  mov    %r13,-0x38(%rsp)
  mov    %r14,%r8
  mov    %r12,-0x30(%rsp)
  mov    %r13d,%ebp
  movd   %xmm0,%ebx
  mov    %eax,%r11d
  mov    %ecx,%r9d
  mov    %r15,-0x28(%rsp)
  mov    %eax,%r15d
  mov    %r14,-0x20(%rsp)
  sub    %r13d,%r11d
  sub    %esi,%r9d
  mov    %ecx,%r14d
  nopl   0x0(%rax,%rax,1)
L58:
  mov    %ebx,%esi
  add    $0x1,%ebx
  mov    %ebp,%r13d
  add    $0x1,%ebp
  cmp    %ebx,%r14d
  jle    L35
  cmp    %ebp,%r15d
  jle    L35
  lea    0x2(%r13),%edx
  mov    %r12,%rcx
  mov    %ebx,%esi
  mov    $0x1,%eax
  jmp    L241
  nopl   (%rax)
L231:
  add    $0x1,%eax
  lea    0x1(%rsi),%edi
  mov    %edx,%r10d
  cmp    %eax,%r9d
  je     L149
  add    $0x1,%rdx
  add    $0x50,%rcx
  cmp    %r11d,%eax
  je     L149
  mov    %edi,%esi
L241:
  mov    -0x4(%r8,%rdx,4),%edi
  cmp    %edi,(%rcx)
  je     L231
  lea    -0x1(%rax,%r13,1),%eax
  sub    $0x1,%esi
  cmp    %ebp,%eax
  setg   %dl
  cmp    %esi,%ebx
  setl   %al
  and    %edx,%eax
L114:
  add    $0x54,%r12
  add    $0x50,%r8
  sub    $0x1,%r11d
  sub    $0x1,%r9d
  test   %al,%al
  jne    L58
L35:
  mov    -0x38(%rsp),%r13
  mov    -0x30(%rsp),%r12
  mov    -0x28(%rsp),%r15
  mov    -0x20(%rsp),%r14
L165:
  movd   %xmm0,%eax
  sub    %eax,%esi
  lea    0x1(%rsi),%eax
  cmp    -0x18(%rsp),%eax
  jle    L196
  mov    -0x5c(%rsp),%ecx
  mov    %eax,-0x18(%rsp)
  add    $0x1,%r13
  add    $0x4,%r12
  mov    -0x8(%rsp),%rbx
  mov    %ecx,0x4(%rbx)
  movd   %xmm0,(%rbx)
  cmp    -0x58(%rsp),%r13
  jne    L40
  nopl   0x0(%rax,%rax,1)
L59:
  addq   $0x1,-0x48(%rsp)
  mov    -0x50(%rsp),%ebx
  add    $0x50,%r15
  add    $0x50,%r14
  cmp    %ebx,-0x4c(%rsp)
  jne    L159
  mov    -0x18(%rsp),%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax,%rax,1)
L149:
  sub    $0x1,%r10d
  cmp    %ebp,%r10d
  setg   %dl
  cmp    %ebx,%esi
  setg   %al
  and    %edx,%eax
  jmp    L114
L196:
  jne    L85
  mov    -0x8(%rsp),%rax
  mov    -0x3c(%rsp),%ebx
  cmp    %ebx,(%rax)
  jl     L85
  mov    -0xc(%rsp),%ebx
  cmp    %ebx,0x4(%rax)
  jle    L85
  movq   %xmm1,(%rax)
  jmp    L85
L135:
  mov    -0x14(%rsp),%esi
  jmp    L165
L34:
  movl   $0x0,-0x18(%rsp)
  mov    -0x18(%rsp),%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
int goodv(int m[][20], int ind[], int r, int c) {
  int endi[2], i, j, k, k1, k2, maxg = 0, tmpg;
  int tmpi[2];
  for (i = 0; i < c; ++i)
    for (j = 0; j < r; ++j) {
      endi[0] = r - 1;
      endi[1] = c - 1;
      if (m[i + 1][j] == m[i][j + 1] && (i + 1) < r && (j + 1) < c) {
        tmpi[0] = k1 = i;
        tmpi[1] = k2 = j;
        tmpg = 0;
        while (k1 < endi[0] && k2 < endi[1]) {
          k = 1;
          while ((((k1 + k) < r) && ((k2 + k) < c)) && (m[k1 + k][k2] == m[k1][k2 + k]))
            k++;
          endi[0] = k1 + k - 1;
          endi[1] = k2 + k - 1;
          k1++;
          k2++;
        }
        tmpg = endi[0] - i + 1;
        if (tmpg > maxg) {
          maxg = tmpg;
          ind[0] = tmpi[0];
          ind[1] = tmpi[1];
        } else if (tmpg == maxg) {
          if (((tmpi[0] < ind[0]) || (tmpi[0] == ind[0])) && (tmpi[1] < ind[1])) {
            ind[0] = tmpi[0];
            ind[1] = tmpi[1];
          }
        }
      }
    }
  return maxg;
}
```