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

```asm
<unpackforblock21_64>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %edi,-0x44(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %rdx,-0x58(%rbp)
  mov    -0x50(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x58(%rbp),%rax
  mov    (%rax),%rax
  mov    %rax,-0x8(%rbp)
  movl   $0x1fffff,-0x40(%rbp)
  mov    -0x10(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x3c(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0x4,%rax
  mov    (%rax),%eax
  mov    %eax,-0x38(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%eax
  mov    %eax,-0x34(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0xc,%rax
  mov    (%rax),%eax
  mov    %eax,-0x30(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0x10,%rax
  mov    (%rax),%eax
  mov    %eax,-0x2c(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0x14,%rax
  mov    (%rax),%eax
  mov    %eax,-0x28(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0x18,%rax
  mov    (%rax),%eax
  mov    %eax,-0x24(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0x1c,%rax
  mov    (%rax),%eax
  mov    %eax,-0x20(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0x20,%rax
  mov    (%rax),%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0x24,%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x10(%rbp),%rax
  add    $0x28,%rax
  mov    (%rax),%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x50(%rbp),%rax
  mov    (%rax),%rax
  lea    0x150(%rax),%rdx
  mov    -0x50(%rbp),%rax
  mov    %rdx,(%rax)
  mov    -0x3c(%rbp),%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%edx
  mov    -0x44(%rbp),%eax
  add    %eax,%edx
  mov    -0x8(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x3c(%rbp),%eax
  sar    $0x15,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x4,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x2a,%edx
  mov    -0x3c(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x8,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x3f,%edx
  mov    -0x3c(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x38(%rbp),%eax
  add    %eax,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0xc,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x38(%rbp),%eax
  sar    $0x14,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x10,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x29,%edx
  mov    -0x38(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x14,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x3e,%edx
  mov    -0x38(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x34(%rbp),%eax
  shl    $0x2,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x18,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x34(%rbp),%eax
  sar    $0x13,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x1c,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x28,%edx
  mov    -0x34(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x20,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x3d,%edx
  mov    -0x34(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x30(%rbp),%eax
  shl    $0x3,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x24,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x30(%rbp),%eax
  sar    $0x12,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x28,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x27,%edx
  mov    -0x30(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x2c,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x3c,%edx
  mov    -0x30(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x2c(%rbp),%eax
  shl    $0x4,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x30,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x2c(%rbp),%eax
  sar    $0x11,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x34,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x26,%edx
  mov    -0x2c(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x38,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x3b,%edx
  mov    -0x2c(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x28(%rbp),%eax
  shl    $0x5,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x3c,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x28(%rbp),%eax
  sar    $0x10,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x40,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x25,%edx
  mov    -0x28(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x44,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x3a,%edx
  mov    -0x28(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x24(%rbp),%eax
  shl    $0x6,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x48,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x24(%rbp),%eax
  sar    $0xf,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x4c,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x24,%edx
  mov    -0x24(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x50,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x39,%edx
  mov    -0x24(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x20(%rbp),%eax
  shl    $0x7,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x54,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x20(%rbp),%eax
  sar    $0xe,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x58,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x23,%edx
  mov    -0x20(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x5c,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x38,%edx
  mov    -0x20(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x1c(%rbp),%eax
  shl    $0x8,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x60,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x1c(%rbp),%eax
  sar    $0xd,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x64,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x22,%edx
  mov    -0x1c(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x68,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x37,%edx
  mov    -0x1c(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x18(%rbp),%eax
  shl    $0x9,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x6c,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x18(%rbp),%eax
  sar    $0xc,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x70,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x21,%edx
  mov    -0x18(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x74,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    $0x36,%edx
  mov    -0x18(%rbp),%eax
  mov    %edx,%ecx
  sar    %cl,%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  shl    $0xa,%eax
  or     %edx,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x78,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x14(%rbp),%eax
  sar    $0xb,%eax
  and    -0x40(%rbp),%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  add    $0x7c,%rax
  mov    -0x44(%rbp),%edx
  add    %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x58(%rbp),%rax
  mov    (%rax),%rax
  lea    0x80(%rax),%rdx
  mov    -0x58(%rbp),%rax
  mov    %rdx,(%rax)
  nop
  pop    %rbp
  ret
```

assistant: ```c
void unpackforblock21_64(const uint64_t base, const uint8_t **pw, uint64_t **pout) {
  const uint64_t *pw64 = *(const uint64_t **)pw;
  uint64_t *out = *pout;
  const uint64_t mask = (2097151ULL);
  uint64_t w0 = pw64[0];
  uint64_t w1 = pw64[1];
  uint64_t w2 = pw64[2];
  uint64_t w3 = pw64[3];
  uint64_t w4 = pw64[4];
  uint64_t w5 = pw64[5];
  uint64_t w6 = pw64[6];
  uint64_t w7 = pw64[7];
  uint64_t w8 = pw64[8];
  uint64_t w9 = pw64[9];
  uint64_t w10 = pw64[10];
  *pw += 84;
  out[0] = base + ((w0)&mask);
  out[1] = base + ((w0 >> 21) & mask);
  out[2] = base + ((w0 >> 42) & mask);
  out[3] = base + (((w0 >> 63) | (w1 << 1)) & mask);
  out[4] = base + ((w1 >> 20) & mask);
  out[5] = base + ((w1 >> 41) & mask);
  out[6] = base + (((w1 >> 62) | (w2 << 2)) & mask);
  out[7] = base + ((w2 >> 19) & mask);
  out[8] = base + ((w2 >> 40) & mask);
  out[9] = base + (((w2 >> 61) | (w3 << 3)) & mask);
  out[10] = base + ((w3 >> 18) & mask);
  out[11] = base + ((w3 >> 39) & mask);
  out[12] = base + (((w3 >> 60) | (w4 << 4)) & mask);
  out[13] = base + ((w4 >> 17) & mask);
  out[14] = base + ((w4 >> 38) & mask);
  out[15] = base + (((w4 >> 59) | (w5 << 5)) & mask);
  out[16] = base + ((w5 >> 16) & mask);
  out[17] = base + ((w5 >> 37) & mask);
  out[18] = base + (((w5 >> 58) | (w6 << 6)) & mask);
  out[19] = base + ((w6 >> 15) & mask);
  out[20] = base + ((w6 >> 36) & mask);
  out[21] = base + (((w6 >> 57) | (w7 << 7)) & mask);
  out[22] = base + ((w7 >> 14) & mask);
  out[23] = base + ((w7 >> 35) & mask);
  out[24] = base + (((w7 >> 56) | (w8 << 8)) & mask);
  out[25] = base + ((w8 >> 13) & mask);
  out[26] = base + ((w8 >> 34) & mask);
  out[27] = base + (((w8 >> 55) | (w9 << 9)) & mask);
  out[28] = base + ((w9 >> 12) & mask);
  out[29] = base + ((w9 >> 33) & mask);
  out[30] = base + (((w9 >> 54) | (w10 << 10)) & mask);
  out[31] = base + ((w10 >> 11) & mask);
  *pout += 32;
}
```