user: Please show me the C implementation that matches the assembly code listed below:

```asm
<validity>:
  endbr64
  push   %r15
  mov    %rdi,%r9
  lea    0x24(%rdi),%r11
  mov    %rdi,%rdx
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%rbx
L841:
  xor    %eax,%eax
  mov    %rdx,%rsi
  mov    $0x1,%r10d
  mov    %eax,%r8d
  cmp    $0x7,%eax
  ja     L961
L807:
  mov    (%rsi),%ecx
  mov    0x120(%rdx),%edi
  cmp    %edi,%ecx
  jne    L293
  test   %edi,%edi
  jne    L613
L293:
  cmp    $0x7,%eax
  je     L86
  mov    0xfc(%rdx),%edi
  cmp    %edi,%ecx
  jne    L1001
  test   %edi,%edi
  jne    L613
L1001:
  cmp    $0x6,%eax
  je     L86
  mov    0xd8(%rdx),%edi
  cmp    %edi,%ecx
  jne    L800
  test   %edi,%edi
  jne    L613
L800:
  cmp    $0x5,%eax
  je     L86
  mov    0xb4(%rdx),%edi
  cmp    %edi,%ecx
  jne    L720
  test   %edi,%edi
  jne    L613
L720:
  cmp    $0x4,%eax
  je     L86
  mov    0x90(%rdx),%edi
  test   %edi,%edi
  je     L346
  cmp    %edi,%ecx
  je     L613
L346:
  cmp    $0x3,%eax
  je     L86
  mov    0x6c(%rdx),%edi
  test   %edi,%edi
  je     L116
  cmp    %edi,%ecx
  je     L613
L116:
  cmp    $0x2,%eax
  je     L86
  mov    0x48(%rdx),%edi
  test   %edi,%edi
  je     L675
  cmp    %edi,%ecx
  je     L613
L675:
  test   %eax,%eax
  jne    L86
  mov    0x24(%rdx),%edi
  cmp    %ecx,%edi
  jne    L86
  test   %edi,%edi
  jne    L857
L86:
  add    $0x1,%eax
  add    $0x1,%r10d
  add    $0x24,%rsi
  mov    %eax,%r8d
  cmp    $0x7,%eax
  jbe    L807
L961:
  cmp    $0x9,%r10d
  jne    L86
  add    $0x4,%rdx
  cmp    %r11,%rdx
  jne    L841
  xor    %ecx,%ecx
  lea    0x4(%r9),%r10
  lea    0x148(%r9),%rdi
L993:
  mov    %r10,%rax
  mov    %ecx,%r8d
L354:
  cmp    $0x8,%rcx
  je     L514
  mov    -0x4(%rax,%rcx,4),%edx
  mov    0x1c(%rax),%esi
  cmp    %esi,%edx
  jne    L111
  test   %esi,%esi
  jne    L613
L111:
  cmp    $0x7,%r8d
  je     L514
  mov    0x18(%rax),%esi
  cmp    %esi,%edx
  jne    L508
  test   %esi,%esi
  jne    L613
L508:
  cmp    $0x6,%r8d
  je     L514
  mov    0x14(%rax),%esi
  cmp    %esi,%edx
  jne    L669
  test   %esi,%esi
  jne    L613
L669:
  cmp    $0x5,%r8d
  je     L514
  mov    0x10(%rax),%esi
  cmp    %esi,%edx
  jne    L1009
  test   %esi,%esi
  jne    L613
L1009:
  cmp    $0x4,%r8d
  je     L514
  mov    0xc(%rax),%esi
  cmp    %esi,%edx
  jne    L43
  test   %esi,%esi
  jne    L613
L43:
  cmp    $0x3,%r8d
  je     L514
  mov    0x8(%rax),%esi
  cmp    %esi,%edx
  jne    L532
  test   %esi,%esi
  jne    L613
L532:
  cmp    $0x2,%r8d
  je     L514
  mov    0x4(%rax),%esi
  cmp    %esi,%edx
  jne    L588
  test   %esi,%esi
  jne    L613
L588:
  test   %r8d,%r8d
  jne    L514
  mov    (%rax),%esi
  cmp    %edx,%esi
  jne    L514
  test   %esi,%esi
  jne    L857
L514:
  add    $0x24,%rax
  cmp    %rax,%rdi
  jne    L354
  add    $0x1,%rcx
  cmp    $0x9,%rcx
  jne    L993
  mov    $0xfffffffd,%r13d
  xor    %edx,%edx
L832:
  mov    %rbx,%r8
  xor    %ecx,%ecx
  xor    %eax,%eax
  cmp    $0x2,%edx
  jle    L7
L301:
  cmp    $0x3,%r13d
  sbb    %r11d,%r11d
  and    $0xfffffffd,%r11d
  add    $0x7,%r11d
  cmp    $0x3,%r13d
  sbb    %r10d,%r10d
  and    $0xfffffffd,%r10d
  add    $0x8,%r10d
  cmp    $0x3,%r13d
  sbb    %ebp,%ebp
  and    $0xfffffffd,%ebp
  add    $0x6,%ebp
L79:
  cmp    %ecx,%eax
  setne  %r14b
  cmp    %edx,%ebp
  jne    L581
  lea    0x1(%rax),%edi
  test   %r14b,%r14b
  je     L909
L581:
  movslq %eax,%rsi
  movslq %ebp,%r12
  mov    (%r8),%r15d
  lea    (%rsi,%rsi,8),%rsi
  lea    (%r9,%r12,4),%rdi
  shl    $0x2,%rsi
  mov    (%rdi,%rsi,1),%edi
  cmp    %r15d,%edi
  jne    L517
  test   %edi,%edi
  jne    L613
L517:
  lea    0x1(%rax),%edi
  cmp    %edx,%ebp
  je     L909
  lea    (%r9,%r12,4),%rbp
  mov    0x24(%rsi,%rbp,1),%esi
  cmp    %esi,%r15d
  jne    L540
  test   %esi,%esi
  jne    L613
L540:
  lea    0x2(%rax),%esi
L700:
  movslq %esi,%rbp
  lea    0x0(%rbp,%rbp,8),%rbp
  lea    (%r9,%rbp,4),%rbp
  mov    0x0(%rbp,%r12,4),%ebp
  test   %ebp,%ebp
  je     L549
  cmp    %r15d,%ebp
  je     L613
L549:
  cmp    %r11d,%edx
  jne    L107
  test   %r14b,%r14b
  je     L15
L107:
  movslq %eax,%rbp
  lea    0x0(%rbp,%rbp,8),%rbp
  lea    (%r9,%rbp,4),%r12
  movslq %r11d,%rbp
  mov    (%r12,%rbp,4),%r15d
  mov    (%r8),%r12d
  test   %r15d,%r15d
  je     L263
  cmp    %r12d,%r15d
  je     L613
L263:
  cmp    %r11d,%edx
  je     L15
  movslq %edi,%r11
  lea    (%r11,%r11,8),%r11
  lea    (%r9,%r11,4),%r11
  mov    (%r11,%rbp,4),%r11d
  test   %r11d,%r11d
  je     L56
  cmp    %r11d,%r12d
  je     L613
L56:
  movslq %esi,%r11
  lea    (%r11,%r11,8),%r11
  lea    (%r9,%r11,4),%r11
  mov    (%r11,%rbp,4),%r11d
  cmp    %r12d,%r11d
  jne    L131
  test   %r11d,%r11d
  jne    L613
L131:
  cmp    %r10d,%edx
  jne    L461
  test   %r14b,%r14b
  je     L551
L461:
  cltq
  lea    (%rax,%rax,8),%rax
  lea    (%r9,%rax,4),%r11
  movslq %r10d,%rax
  mov    (%r11,%rax,4),%ebp
  mov    (%r8),%r11d
  test   %ebp,%ebp
  je     L950
  cmp    %r11d,%ebp
  je     L613
L950:
  cmp    %r10d,%edx
  je     L551
  movslq %edi,%rdi
  lea    (%rdi,%rdi,8),%rdi
  lea    (%r9,%rdi,4),%rdi
  mov    (%rdi,%rax,4),%edi
  test   %edi,%edi
  je     L654
  cmp    %edi,%r11d
  je     L613
L654:
  movslq %esi,%rsi
  lea    (%rsi,%rsi,8),%rsi
  lea    (%r9,%rsi,4),%rsi
  mov    (%rsi,%rax,4),%eax
  cmp    %r11d,%eax
  jne    L340
  test   %eax,%eax
  jne    L613
L340:
  lea    0x1(%rcx),%esi
  cmp    $0x8,%ecx
  je     L122
  cmp    $0x2,%esi
  jle    L291
  sub    $0x2,%ecx
  cmp    $0x3,%ecx
  sbb    %eax,%eax
  and    $0xfffffffd,%eax
  add    $0x6,%eax
L1004:
  add    $0x24,%r8
  mov    %esi,%ecx
  cmp    $0x2,%edx
  jg     L301
L7:
  mov    $0x1,%r11d
  mov    $0x2,%r10d
  xor    %ebp,%ebp
  jmp    L79
  nopl   (%rax)
L613:
  xor    %r8d,%r8d
L857:
  pop    %rbx
  mov    %r8d,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L909:
  cmp    %ecx,%edi
  je     L1012
  movslq %edi,%rsi
  movslq %ebp,%r12
  lea    (%rsi,%rsi,8),%rsi
  lea    (%r9,%rsi,4),%rsi
  mov    (%rsi,%r12,4),%esi
  cmp    %esi,(%r8)
  jne    L1012
  test   %esi,%esi
  jne    L613
L1012:
  lea    0x2(%rax),%esi
  cmp    %ecx,%esi
  je     L549
  mov    (%r8),%r15d
  movslq %ebp,%r12
  jmp    L700
L15:
  cmp    %edi,%ecx
  je     L495
  movslq %edi,%rbp
  lea    0x0(%rbp,%rbp,8),%rbp
  lea    (%r9,%rbp,4),%r12
  movslq %r11d,%rbp
  mov    (%r12,%rbp,4),%ebp
  cmp    %ebp,(%r8)
  jne    L495
  test   %ebp,%ebp
  jne    L613
L495:
  cmp    %esi,%ecx
  je     L131
  mov    (%r8),%r12d
  movslq %r11d,%rbp
  jmp    L56
L551:
  cmp    %edi,%ecx
  je     L859
  movslq %edi,%rdi
  lea    (%rdi,%rdi,8),%rax
  lea    (%r9,%rax,4),%rdi
  movslq %r10d,%rax
  mov    (%rdi,%rax,4),%eax
  cmp    %eax,(%r8)
  jne    L859
  test   %eax,%eax
  jne    L613
L859:
  cmp    %esi,%ecx
  je     L340
  mov    (%r8),%r11d
  movslq %r10d,%rax
  jmp    L654
L122:
  add    $0x1,%edx
  add    $0x4,%rbx
  add    $0x1,%r13d
  cmp    $0x9,%edx
  jne    L832
  mov    $0x1,%r8d
  jmp    L857
L291:
  xor    %eax,%eax
  jmp    L1004
```

assistant: ```c
int validity(int grid[9][9]) {
  int x, y, testx, testy, startx, starty, loop;
  for (y = 0; y < 9; ++y)
    for (x = 0; x < 9; ++x)
      for (testx = 8; testx > x; --testx)
        if ((testx != x) && (grid[testx][y] == grid[x][y]) && (grid[testx][y] != 0)) {
          return 0;
        }
  for (y = 0; y < 9; ++y)
    for (x = 0; x < 9; ++x)
      for (testy = 8; testy > y; --testy)
        if ((testy != y) && (grid[x][testy] == grid[x][y]) && (grid[x][testy] != 0)) {
          return 0;
        }
  for (y = 0; y < 9; ++y)
    for (x = 0; x < 9; ++x) {
      if ((x >= 0) && (x <= 2))
        startx = 0;
      else if ((x >= 3) && (x <= 5))
        startx = 3;
      else if ((x >= 6) && (x <= 8))
        startx = 6;
      if ((y >= 0) && (y <= 2))
        starty = 0;
      else if ((y >= 3) && (y <= 5))
        starty = 3;
      else if ((y >= 6) && (y <= 8))
        starty = 6;
      for (testy = 0; testy < 3; ++testy)
        for (testx = 0; testx < 3; ++testx)
          if (!(((starty + testy) == y) && ((startx + testx) == x)) && (grid[startx + testx][starty + testy] == grid[x][y]) && (grid[startx + testx][starty + testy] != 0)) {
            return 0;
          }
    }
  return 1;
}
```