user: Demonstrate the C code that generates the assembly output below:

```asm
<lowertriag>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    -0x2c(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,-0x14(%rbp)
  jmp    L55
L72:
  mov    -0x14(%rbp),%eax
  mov    %eax,-0xc(%rbp)
  mov    -0x2c(%rbp),%eax
  imul   -0x14(%rbp),%eax
  add    %eax,%eax
  movslq %eax,%rdx
  mov    -0x14(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  movss  %xmm0,-0x8(%rbp)
  mov    -0xc(%rbp),%eax
  sub    $0x1,%eax
  mov    %eax,-0x10(%rbp)
  jmp    L51
L64:
  mov    -0x2c(%rbp),%eax
  imul   -0x10(%rbp),%eax
  add    %eax,%eax
  movslq %eax,%rdx
  mov    -0x14(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  divss  -0x8(%rbp),%xmm0
  movss  %xmm0,-0x4(%rbp)
  mov    -0x14(%rbp),%eax
  mov    %eax,-0x18(%rbp)
  jmp    L52
L28:
  mov    -0x2c(%rbp),%eax
  imul   -0x10(%rbp),%eax
  add    %eax,%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mov    -0x2c(%rbp),%eax
  imul   -0xc(%rbp),%eax
  add    %eax,%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm1
  mulss  -0x4(%rbp),%xmm1
  mov    -0x2c(%rbp),%eax
  imul   -0x10(%rbp),%eax
  add    %eax,%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  subss  %xmm1,%xmm0
  movss  %xmm0,(%rax)
  subl   $0x1,-0x18(%rbp)
L52:
  cmpl   $0x0,-0x18(%rbp)
  jns    L28
  mov    -0x2c(%rbp),%eax
  mov    %eax,-0x18(%rbp)
  jmp    L22
L37:
  mov    -0x2c(%rbp),%eax
  imul   -0x10(%rbp),%eax
  add    %eax,%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mov    -0x2c(%rbp),%eax
  imul   -0xc(%rbp),%eax
  add    %eax,%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm1
  mulss  -0x4(%rbp),%xmm1
  mov    -0x2c(%rbp),%eax
  imul   -0x10(%rbp),%eax
  add    %eax,%eax
  movslq %eax,%rdx
  mov    -0x18(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  subss  %xmm1,%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x18(%rbp)
L22:
  mov    -0x2c(%rbp),%eax
  add    %eax,%eax
  cmp    %eax,-0x18(%rbp)
  jl     L37
  subl   $0x1,-0x10(%rbp)
L51:
  cmpl   $0x0,-0x10(%rbp)
  jns    L64
  subl   $0x1,-0x14(%rbp)
L55:
  cmpl   $0x0,-0x14(%rbp)
  jg     L72
  nop
  nop
  pop    %rbp
  ret
```

assistant: ```c
void lowertriag(float *array, int n) {
  int i, j;
  for (j = n - 1; j >= 1; j--) {
    int k = j, l;
    float pivot1 = *(array + (2 * n) * j + j);
    for (l = k - 1; l >= 0; l--) {
      float next = *(array + (2 * n) * (l) + j) / pivot1;
      for (i = j; i >= 0; i--) {
        *(array + (2 * n) * l + i) -= *(array + (2 * n) * (k) + i) * next;
      }
      for (i = n; i < 2 * n; i++) {
        *(array + (2 * n) * l + i) -= *(array + (2 * n) * (k) + i) * next;
      }
    }
  }
}
```