user: 下面的汇编指令对应的C源代码是什么：

```asm
<largestProductHorizontallyAndVertically>:
  endbr64
  push   %r15
  lea    0x500(%rdi),%rax
  mov    %rdi,%r8
  push   %r14
  mov    %rdi,%r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x130,%rsp
  mov    %rax,0x128(%rsp)
  movq   $0x1,-0x18(%rsp)
  nopl   0x0(%rax,%rax,1)
L6:
  movslq 0x4(%r14),%rdi
  movslq (%r14),%rax
  movslq 0x8(%r14),%rcx
  movslq 0x50(%r8),%rsi
  imul   %rdi,%rax
  movslq 0x10(%r14),%r12
  movslq 0x1c(%r14),%r15
  movslq 0xa0(%r8),%rdx
  movslq 0xf0(%r8),%r13
  imul   %rcx,%rdi
  movslq 0x140(%r8),%rbx
  movslq 0x1e0(%r8),%rbp
  imul   %rcx,%rax
  mov    %r13,%r10
  mov    %rax,0x30(%rsp)
  movslq (%r8),%rax
  imul   %rsi,%rax
  imul   %rdx,%rsi
  imul   %rdx,%rax
  imul   %r13,%rdx
  imul   %r13,%rsi
  mov    %rax,0x38(%rsp)
  movslq 0xc(%r14),%rax
  imul   %rbx,%rdx
  imul   %rax,%rcx
  mov    %rsi,0x48(%rsp)
  movslq 0x14(%r14),%rsi
  imul   %rax,%rdi
  mov    %rdx,0x60(%rsp)
  mov    %rax,%rdx
  imul   %r12,%rcx
  mov    %rsi,0x68(%rsp)
  imul   %r12,%rdx
  mov    %rdi,0x40(%rsp)
  movslq 0x18(%r14),%rdi
  mov    %rcx,0x58(%rsp)
  mov    %rbx,%rcx
  movslq 0x190(%r8),%rbx
  imul   %rcx,%r10
  mov    %rcx,0x50(%rsp)
  imul   %rsi,%rdx
  mov    %rbx,%r11
  imul   %rbp,%r11
  mov    %r10,%r9
  mov    %rcx,%r10
  movslq 0x20(%r14),%rcx
  imul   %rbx,%r10
  mov    %rdx,0x70(%rsp)
  mov    %rsi,%rdx
  imul   %r12,%rdx
  imul   %rbx,%r9
  imul   %rbp,%r10
  imul   %rdi,%rdx
  mov    %r9,0x78(%rsp)
  mov    %r10,0x98(%rsp)
  movslq 0x230(%r8),%r10
  mov    %rdx,0x90(%rsp)
  mov    %rsi,%rdx
  mov    %rcx,%rsi
  mov    %rdi,%rcx
  imul   %rdi,%rdx
  imul   %r10,%r11
  imul   %r15,%rcx
  mov    %rdx,%r9
  mov    %r15,%rdx
  mov    %r11,0xb0(%rsp)
  imul   %r15,%r9
  mov    %rcx,%r11
  mov    %rsi,%rcx
  imul   %rsi,%r11
  mov    %r9,0xa8(%rsp)
  movslq 0x280(%r8),%r9
  imul   %rcx,%rdx
  mov    %rdi,0x80(%rsp)
  movslq 0x2d0(%r8),%rdi
  mov    %r11,0xc0(%rsp)
  mov    %rbp,%r11
  imul   %r10,%r11
  mov    %rbp,0x88(%rsp)
  mov    %r10,%rbp
  imul   %r9,%rbp
  mov    %r15,0xa0(%rsp)
  mov    %rcx,0xb8(%rsp)
  mov    %r11,%rsi
  mov    %rdx,%r11
  mov    %rcx,%rdx
  movslq 0x2c(%r14),%rcx
  imul   %r9,%rsi
  imul   %rdi,%rbp
  mov    %rsi,0xc8(%rsp)
  movslq 0x24(%r14),%rsi
  mov    %rbp,0xe0(%rsp)
  mov    %rsi,%r15
  imul   %rsi,%r11
  movslq 0x28(%r14),%rsi
  imul   %r15,%rdx
  mov    %r15,0xd0(%rsp)
  mov    %rsi,%rbp
  movslq 0x320(%r8),%rsi
  mov    %r11,0xd8(%rsp)
  mov    %rdx,%r11
  mov    %rbp,-0x58(%rsp)
  imul   -0x58(%rsp),%r15
  imul   %rbp,%r11
  mov    %r9,%rbp
  movslq 0x30(%r14),%rdx
  imul   %rdi,%rbp
  mov    %r11,0xe8(%rsp)
  mov    %r15,%r11
  mov    -0x58(%rsp),%r15
  imul   %rsi,%rbp
  mov    %rbp,0xf0(%rsp)
  mov    %rcx,%rbp
  movslq 0x370(%r8),%rcx
  mov    %rbp,-0x50(%rsp)
  imul   %rbp,%r11
  mov    %rdi,%rbp
  imul   %rsi,%rbp
  imul   -0x50(%rsp),%r15
  mov    %r11,0xf8(%rsp)
  imul   %rcx,%rbp
  mov    %r15,%r11
  movslq 0x34(%r14),%r15
  mov    %rbp,0x100(%rsp)
  mov    %rdx,%rbp
  movslq 0x3c0(%r8),%rdx
  imul   %rbp,%r11
  mov    %rbp,-0x48(%rsp)
  mov    %rsi,%rbp
  imul   %rcx,%rbp
  mov    %r11,0x108(%rsp)
  mov    %rbp,%r11
  mov    %r15,%rbp
  movslq 0x410(%r8),%r15
  imul   %rdx,%r11
  mov    %r15,-0x68(%rsp)
  mov    -0x50(%rsp),%r15
  mov    %r11,0x110(%rsp)
  imul   -0x48(%rsp),%r15
  mov    %rbp,-0x40(%rsp)
  mov    %r15,%r11
  movslq 0x460(%r8),%r15
  imul   %rbp,%r11
  mov    %rcx,%rbp
  imul   %rdx,%rbp
  mov    %r15,-0x60(%rsp)
  mov    -0x48(%rsp),%r15
  imul   -0x40(%rsp),%r15
  mov    %r11,0x118(%rsp)
  mov    %rbp,%r11
  mov    -0x68(%rsp),%rbp
  imul   %rbp,%r11
  mov    %r11,0x120(%rsp)
  movslq 0x38(%r14),%r11
  imul   %r11,%r15
  mov    %r11,-0x20(%rsp)
  mov    %r15,(%rsp)
  mov    %rbp,%r15
  mov    -0x60(%rsp),%rbp
  imul   %rdx,%r15
  imul   %r15,%rbp
  movslq 0x3c(%r14),%r15
  mov    %r15,-0x78(%rsp)
  movslq 0x4b0(%r8),%r15
  mov    %rbp,0x8(%rsp)
  mov    -0x78(%rsp),%rbp
  mov    %r15,-0x70(%rsp)
  mov    -0x40(%rsp),%r15
  imul   %r11,%r15
  movslq 0x40(%r14),%r11
  mov    %r11,-0x38(%rsp)
  imul   %r15,%rbp
  mov    -0x68(%rsp),%r15
  imul   -0x60(%rsp),%r15
  mov    %rbp,-0x8(%rsp)
  mov    -0x70(%rsp),%rbp
  imul   %r15,%rbp
  mov    -0x78(%rsp),%r15
  imul   -0x20(%rsp),%r15
  mov    %rbp,-0x10(%rsp)
  movslq 0x500(%r8),%rbp
  imul   %r11,%r15
  mov    %r15,0x20(%rsp)
  mov    -0x70(%rsp),%r15
  imul   -0x60(%rsp),%r15
  mov    %rbp,0x18(%rsp)
  mov    %r15,%r11
  movslq 0x550(%r8),%r15
  imul   %rbp,%r11
  mov    %r15,-0x28(%rsp)
  mov    %r11,0x28(%rsp)
  movslq 0x44(%r14),%r11
  mov    %r11,-0x30(%rsp)
  mov    -0x38(%rsp),%r11
  imul   -0x78(%rsp),%r11
  mov    -0x30(%rsp),%r15
  imul   %r11,%r15
  mov    0x88(%rsp),%r11
  mov    %r15,0x10(%rsp)
  mov    -0x70(%rsp),%r15
  imul   %rbp,%r15
  mov    0x50(%rsp),%rbp
  imul   -0x28(%rsp),%r15
  imul   0x30(%rsp),%rax
  imul   0x38(%rsp),%r13
  cmp    %r13,%rax
  cmovae %rax,%r13
  mov    0x40(%rsp),%rax
  imul   %r12,%rax
  cmp    %rax,%r13
  cmovae %r13,%rax
  imul   0x48(%rsp),%rbp
  cmp    %rbp,%rax
  cmovae %rax,%rbp
  mov    0x58(%rsp),%rax
  imul   0x68(%rsp),%rax
  cmp    %rax,%rbp
  cmovae %rbp,%rax
  imul   0x60(%rsp),%rbx
  cmp    %rbx,%rax
  cmovae %rax,%rbx
  mov    0x70(%rsp),%rax
  imul   0x80(%rsp),%rax
  cmp    %rax,%rbx
  cmovae %rbx,%rax
  imul   0x78(%rsp),%r11
  cmp    %r11,%rax
  cmovae %rax,%r11
  mov    0x90(%rsp),%rax
  imul   0xa0(%rsp),%rax
  cmp    %rax,%r11
  cmovae %r11,%rax
  imul   0x98(%rsp),%r10
  cmp    %r10,%rax
  cmovae %rax,%r10
  mov    0xa8(%rsp),%rax
  imul   0xb8(%rsp),%rax
  cmp    %rax,%r10
  cmovae %r10,%rax
  imul   0xb0(%rsp),%r9
  cmp    %r9,%rax
  cmovae %rax,%r9
  mov    0xc0(%rsp),%rax
  imul   0xd0(%rsp),%rax
  cmp    %rax,%r9
  cmovae %r9,%rax
  imul   0xc8(%rsp),%rdi
  cmp    %rdi,%rax
  cmovae %rax,%rdi
  mov    0xd8(%rsp),%rax
  imul   -0x58(%rsp),%rax
  cmp    %rax,%rdi
  cmovae %rdi,%rax
  imul   0xe0(%rsp),%rsi
  cmp    %rsi,%rax
  cmovae %rax,%rsi
  mov    0xe8(%rsp),%rax
  imul   -0x50(%rsp),%rax
  cmp    %rax,%rsi
  cmovae %rsi,%rax
  imul   0xf0(%rsp),%rcx
  cmp    %rcx,%rax
  cmovae %rax,%rcx
  mov    0xf8(%rsp),%rax
  imul   -0x48(%rsp),%rax
  cmp    %rax,%rcx
  cmovae %rcx,%rax
  imul   0x100(%rsp),%rdx
  cmp    %rdx,%rax
  cmovae %rax,%rdx
  mov    0x108(%rsp),%rax
  imul   -0x40(%rsp),%rax
  cmp    %rax,%rdx
  cmovae %rdx,%rax
  mov    0x110(%rsp),%rdx
  imul   -0x68(%rsp),%rdx
  cmp    %rdx,%rax
  cmovb  %rdx,%rax
  mov    0x118(%rsp),%rdx
  imul   -0x20(%rsp),%rdx
  cmp    %rdx,%rax
  cmovae %rax,%rdx
  mov    0x120(%rsp),%rax
  imul   -0x60(%rsp),%rax
  cmp    %rax,%rdx
  cmovb  %rax,%rdx
  mov    (%rsp),%rax
  imul   -0x78(%rsp),%rax
  cmp    %rax,%rdx
  cmovb  %rax,%rdx
  mov    0x8(%rsp),%rax
  imul   -0x70(%rsp),%rax
  cmp    %rax,%rdx
  cmovae %rdx,%rax
  mov    -0x38(%rsp),%rdx
  imul   -0x8(%rsp),%rdx
  cmp    %rdx,%rax
  cmovb  %rdx,%rax
  mov    -0x10(%rsp),%rdx
  imul   0x18(%rsp),%rdx
  cmp    %rdx,%rax
  cmovb  %rdx,%rax
  mov    0x20(%rsp),%rdx
  imul   -0x30(%rsp),%rdx
  cmp    %rdx,%rax
  cmovb  %rdx,%rax
  mov    0x28(%rsp),%rdx
  imul   -0x28(%rsp),%rdx
  cmp    %rdx,%rax
  cmovb  %rdx,%rax
  movslq 0x48(%r14),%rdx
  imul   0x10(%rsp),%rdx
  mov    -0x18(%rsp),%rbx
  cmp    %rdx,%rax
  cmovb  %rdx,%rax
  movslq 0x5a0(%r8),%rdx
  imul   %r15,%rdx
  cmp    %rdx,%rax
  cmovb  %rdx,%rax
  cmp    %rax,%rbx
  cmovae %rbx,%rax
  add    $0x4,%r8
  add    $0x50,%r14
  mov    %rax,-0x18(%rsp)
  cmp    0x128(%rsp),%r14
  jne    L6
  add    $0x130,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
unsigned long long largestProductHorizontallyAndVertically(int grid[20][20]) {
  unsigned long long productHorizontal;
  unsigned long long productVertical;
  unsigned long long largest = 1;
  for (int i = 0; i < 20 - 4; i++) {
    for (int j = 0; j < 20 - 4; j++) {
      productHorizontal = productVertical = 1;
      for (int k = j; k < j + 4; k++) {
        if (k < 0 || k >= 20)
          continue;
        productHorizontal *= grid[i][k];
        productVertical *= grid[k][i];
      }
      largest = ((productHorizontal > largest ? productHorizontal : largest) > productVertical ? (productHorizontal > largest ? productHorizontal : largest) : productVertical);
    }
  }
  return largest;
}
```