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

```asm
<bandsol>:
  endbr64
  push   %r15
  movslq %edx,%r10
  mov    %ecx,%r9d
  push   %r14
  lea    (%r10,%rcx,1),%eax
  push   %r13
  lea    0x1(%rax),%r13d
  push   %r12
  mov    %rsi,%r12
  push   %rbp
  mov    %rdi,%rbp
  push   %rbx
  lea    -0x1(%r8),%ebx
  mov    %eax,-0x4(%rsp)
  test   %r8d,%r8d
  jle    L85
  test   %r10d,%r10d
  js     L129
  movslq %r10d,%rax
  cmp    %ebx,%r10d
  mov    %ebx,%r15d
  movslq %r13d,%r11
  mov    %rax,-0x10(%rsp)
  cmovle %r10d,%r15d
  mov    %rsi,%rdx
  lea    (%rdi,%rax,8),%rcx
  lea    0x0(,%r11,8),%r14
  xor    %edi,%edi
  xor    %esi,%esi
  nopl   0x0(%rax)
L34:
  movsd  (%rdx),%xmm1
  test   %edi,%edi
  jns    L79
  mov    %rdi,%rax
  nopl   0x0(%rax,%rax,1)
L28:
  movsd  (%rcx,%rax,8),%xmm0
  mulsd  (%rdx,%rax,8),%xmm0
  add    $0x1,%rax
  addsd  %xmm0,%xmm1
  movsd  %xmm1,(%rdx)
  test   %eax,%eax
  js     L28
L79:
  mulsd  (%rcx),%xmm1
  add    $0x1,%esi
  add    $0x8,%rdx
  add    %r14,%rcx
  sub    $0x1,%rdi
  movsd  %xmm1,-0x8(%rdx)
  cmp    %r15d,%esi
  jle    L34
  cmp    %esi,%r8d
  jle    L85
L67:
  movslq %esi,%rax
  mov    %r10d,%edi
  shl    $0x3,%r11
  lea    (%r12,%rax,8),%rdx
  mov    %r13d,%eax
  neg    %edi
  imul   %esi,%eax
  cltq
  add    -0x10(%rsp),%rax
  lea    0x0(%rbp,%rax,8),%rcx
  nopl   (%rax)
L24:
  movsd  (%rdx),%xmm1
  test   %r10d,%r10d
  jle    L105
  movslq %edi,%rax
  nopl   0x0(%rax)
L118:
  movsd  (%rdx,%rax,8),%xmm0
  mulsd  (%rcx,%rax,8),%xmm0
  add    $0x1,%rax
  addsd  %xmm0,%xmm1
  movsd  %xmm1,(%rdx)
  test   %eax,%eax
  js     L118
L105:
  mulsd  (%rcx),%xmm1
  add    $0x1,%esi
  add    $0x8,%rdx
  add    %r11,%rcx
  movsd  %xmm1,-0x8(%rdx)
  cmp    %esi,%r8d
  jg     L24
L85:
  sub    $0x2,%r8d
  js     L64
  imul   %r8d,%r13d
  mov    -0x4(%rsp),%edi
  not    %edi
  movslq %r13d,%rax
  movslq %edi,%rdi
  add    %r10,%rax
  shl    $0x3,%rdi
  lea    0x0(%rbp,%rax,8),%rcx
  movslq %r8d,%rax
  lea    (%r12,%rax,8),%rdx
  nopl   0x0(%rax,%rax,1)
L91:
  mov    %ebx,%eax
  sub    %r8d,%eax
  cmp    %r9d,%eax
  cmovg  %r9d,%eax
  test   %eax,%eax
  jle    L97
  movsd  (%rdx),%xmm1
  lea    0x1(%rax),%esi
  mov    $0x1,%eax
  nopl   0x0(%rax)
L126:
  movsd  (%rcx,%rax,8),%xmm0
  mulsd  (%rdx,%rax,8),%xmm0
  add    $0x1,%rax
  subsd  %xmm0,%xmm1
  movsd  %xmm1,(%rdx)
  cmp    %rsi,%rax
  jne    L126
L97:
  sub    $0x1,%r8d
  add    %rdi,%rcx
  sub    $0x8,%rdx
  cmp    $0xffffffff,%r8d
  jne    L91
L64:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nop
L129:
  movslq %r10d,%rax
  xor    %esi,%esi
  movslq %r13d,%r11
  mov    %rax,-0x10(%rsp)
  jmp    L67
```

assistant: ```c
void bandsol(double *a, double *b, int ml, int mr, int n) {
  int i, j, k, r0;
  int mt = ml + mr + 1;
  int m, n1 = n - 1, row;
  for (i = 0; i < n; i++) {
    r0 = i * mt + ml;
    m = ((-ml) > (-i) ? (-ml) : (-i));
    for (j = m; j < 0; j++)
      b[i] += a[r0 + j] * b[i + j];
    b[i] *= a[r0];
  }
  for (row = n1 - 1; row >= 0; row--) {
    m = ((mr) < (n1 - row) ? (mr) : (n1 - row));
    r0 = row * mt + ml;
    for (k = 1; k <= m; k++)
      b[row] = b[row] - a[r0 + k] * b[row + k];
  }
}
```