user: What is the c source code of the assembly code below?

```asm
<multiplication>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0xf0,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  movl   $0x1,-0xd0(%rbp)
  movl   $0x1,-0xcc(%rbp)
  movl   $0x1,-0xc8(%rbp)
  movl   $0x1,-0xc4(%rbp)
  movl   $0x2,-0xc0(%rbp)
  movl   $0x2,-0xbc(%rbp)
  movl   $0x2,-0xb8(%rbp)
  movl   $0x2,-0xb4(%rbp)
  movl   $0x3,-0xb0(%rbp)
  movl   $0x3,-0xac(%rbp)
  movl   $0x3,-0xa8(%rbp)
  movl   $0x3,-0xa4(%rbp)
  movl   $0x4,-0xa0(%rbp)
  movl   $0x4,-0x9c(%rbp)
  movl   $0x4,-0x98(%rbp)
  movl   $0x4,-0x94(%rbp)
  movl   $0x1,-0x90(%rbp)
  movl   $0x1,-0x8c(%rbp)
  movl   $0x1,-0x88(%rbp)
  movl   $0x1,-0x84(%rbp)
  movl   $0x2,-0x80(%rbp)
  movl   $0x2,-0x7c(%rbp)
  movl   $0x2,-0x78(%rbp)
  movl   $0x2,-0x74(%rbp)
  movl   $0x3,-0x70(%rbp)
  movl   $0x3,-0x6c(%rbp)
  movl   $0x3,-0x68(%rbp)
  movl   $0x3,-0x64(%rbp)
  movl   $0x4,-0x60(%rbp)
  movl   $0x4,-0x5c(%rbp)
  movl   $0x4,-0x58(%rbp)
  movl   $0x4,-0x54(%rbp)
  movl   $0x0,-0xe4(%rbp)
  jmp    L107
L86:
  movl   $0x0,-0xe0(%rbp)
  jmp    L199
L124:
  mov    -0xe0(%rbp),%eax
  movslq %eax,%rdx
  mov    -0xe4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  movl   $0x0,-0x50(%rbp,%rax,4)
  addl   $0x1,-0xe0(%rbp)
L199:
  cmpl   $0x3,-0xe0(%rbp)
  jle    L124
  addl   $0x1,-0xe4(%rbp)
L107:
  cmpl   $0x3,-0xe4(%rbp)
  jle    L86
  movl   $0x0,-0xd8(%rbp)
  jmp    L133
L3:
  movl   $0x0,-0xe4(%rbp)
  jmp    L72
L167:
  movl   $0x0,-0xe0(%rbp)
  jmp    L53
L113:
  movl   $0x0,-0xdc(%rbp)
  jmp    L49
L70:
  mov    -0xe0(%rbp),%eax
  movslq %eax,%rdx
  mov    -0xe4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  mov    -0x50(%rbp,%rax,4),%ecx
  mov    -0xdc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0xe4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  mov    -0xd0(%rbp,%rax,4),%edx
  mov    -0xe0(%rbp),%eax
  movslq %eax,%rsi
  mov    -0xdc(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rsi,%rax
  mov    -0x90(%rbp,%rax,4),%eax
  imul   %edx,%eax
  lea    (%rcx,%rax,1),%edx
  mov    -0xe0(%rbp),%eax
  movslq %eax,%rcx
  mov    -0xe4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rcx,%rax
  mov    %edx,-0x50(%rbp,%rax,4)
  addl   $0x1,-0xdc(%rbp)
L49:
  cmpl   $0x3,-0xdc(%rbp)
  jle    L70
  addl   $0x1,-0xe0(%rbp)
L53:
  cmpl   $0x3,-0xe0(%rbp)
  jle    L113
  addl   $0x1,-0xe4(%rbp)
L72:
  cmpl   $0x3,-0xe4(%rbp)
  jle    L167
  movl   $0x0,-0xe4(%rbp)
  jmp    L108
L214:
  movl   $0x0,-0xe0(%rbp)
  jmp    L44
L141:
  movl   $0x0,-0xdc(%rbp)
  jmp    L163
L157:
  mov    -0xe0(%rbp),%eax
  movslq %eax,%rdx
  mov    -0xe4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  mov    -0xd0(%rbp,%rax,4),%ecx
  mov    -0xdc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0xe4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  mov    -0x50(%rbp,%rax,4),%edx
  mov    -0xe0(%rbp),%eax
  movslq %eax,%rsi
  mov    -0xdc(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rsi,%rax
  mov    -0x90(%rbp,%rax,4),%eax
  imul   %edx,%eax
  lea    (%rcx,%rax,1),%edx
  mov    -0xe0(%rbp),%eax
  movslq %eax,%rcx
  mov    -0xe4(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rcx,%rax
  mov    %edx,-0xd0(%rbp,%rax,4)
  addl   $0x1,-0xdc(%rbp)
L163:
  cmpl   $0x3,-0xdc(%rbp)
  jle    L157
  addl   $0x1,-0xe0(%rbp)
L44:
  cmpl   $0x3,-0xe0(%rbp)
  jle    L141
  addl   $0x1,-0xe4(%rbp)
L108:
  cmpl   $0x3,-0xe4(%rbp)
  jle    L214
  addl   $0x1,-0xd8(%rbp)
L133:
  cmpl   $0xf423f,-0xd8(%rbp)
  jle    L3
  movl   $0x0,-0xd4(%rbp)
  movl   $0x0,-0xe0(%rbp)
  jmp    L106
L144:
  movl   $0x0,-0xdc(%rbp)
  jmp    L99
L151:
  mov    -0xdc(%rbp),%eax
  movslq %eax,%rdx
  mov    -0xe0(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  mov    -0x50(%rbp,%rax,4),%eax
  add    %eax,-0xd4(%rbp)
  addl   $0x1,-0xdc(%rbp)
L99:
  cmpl   $0x3,-0xdc(%rbp)
  jle    L151
  addl   $0x1,-0xe0(%rbp)
L106:
  cmpl   $0x3,-0xe0(%rbp)
  jle    L144
  mov    -0xd4(%rbp),%eax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L55
  call   <__stack_chk_fail@plt>
L55:
  leave
  ret
```

assistant: ```c
int multiplication() {
  int mat1[4][4] = {{1, 1, 1, 1}, {2, 2, 2, 2}, {3, 3, 3, 3}, {4, 4, 4, 4}};
  int mat2[4][4] = {{1, 1, 1, 1}, {2, 2, 2, 2}, {3, 3, 3, 3}, {4, 4, 4, 4}};
  int res[4][4];
  int i, j, k;
  for (i = 0; i < 4; i++) {
    for (j = 0; j < 4; j++) {
      res[i][j] = 0;
    }
  }
  int z;
  for (z = 0; z < 1000000; ++z) {
    for (i = 0; i < 4; i++) {
      for (j = 0; j < 4; j++) {
        for (k = 0; k < 4; k++)
          res[i][j] += mat1[i][k] * mat2[k][j];
      }
    }
    for (i = 0; i < 4; i++) {
      for (j = 0; j < 4; j++) {
        for (k = 0; k < 4; k++)
          mat1[i][j] += res[i][k] * mat2[k][j];
      }
    }
  }
  int r = 0;
  for (j = 0; j < 4; j++) {
    for (k = 0; k < 4; k++)
      r += res[j][k];
  }
  return r;
}
```