RtlpHpLfhSubsegmentCreate

NTSTATUS __stdcall RtlpHpLfhSubsegmentCreate(INT64 a1, INT64 a2, UINT64 a3){
  __int64 v4; 
  unsigned int v5; 
  unsigned int v7; 
  unsigned int v8; 
  unsigned int v9; 
  NTSTATUS v10; 
  unsigned int v11; 
  unsigned int v12; 
  unsigned int v13; 
  int v14; 
  unsigned int v15; 
  int v16; 
  unsigned int v17; 
  unsigned int v18; 
  unsigned int v19; 
  unsigned int v20; 
  unsigned int v21; 
  UINT8 v22; 
  INT64 v23; 
  unsigned int v24; 
  NTSTATUS v25; 
  unsigned int v27; 
  unsigned int v28; 
  unsigned int v29; 
  unsigned int v30; 
  int v31; 
  int v32; 
  unsigned int v33; 
  int v34; 
  unsigned int v35; 

  v4 = *(unsigned __int8 *)(a2 + 1);
  v5 = a3;
  v31 = 0;
  v34 = 0;
  v7 = (unsigned __int16)word_140010F30[v4];
  v33 = v7;
  if( (RtlpHpLfhPerfFlags & 1) != 0 )
  {
    LOBYTE(v8) = RtlpHpLfhBucketSubsegmentStatsUpdate((INT64 *)(a1 + 64), (unsigned int)v4);
    v9 = v8;
  }
  else
  {
    v9 = 0;
  }
  v10 = RtlpHpLfhBucketComputeNewSubsegmentBlockCount(a2, v9);
  v11 = 7;
  v12 = v7 * v10;
  v13 = 18;
  v14 = (8 * (((unsigned __int64)(unsigned int)(2 * v10) + 63) >> 6) + 63) & 0xFFFFFFF0;
  v15 = v14 + 2 * ((v7 * v10 + v14 + 4095) >> 12);
  v16 = v15 + v12;
  if( v15 + v12 >= 0xF0000 )
    v16 = 983040;
  _BitScanReverse(&v17, v16 - 1);
  v18 = 7;
  v19 = v17 + 1;
  if( v19 > 7 )
    v18 = v19;
  v20 = 18;
  if( v18 < 0x12 )
    v20 = v18;
  if( v20 <= 0xC )
    LOBYTE(v20) = 12;
  v21 = 1 << v20;
  if( (RtlpHpLfhPerfFlags & 8) != 0 && v15 <= v12 >> 6 )
  {
    if( v12 >= 0xF0000 )
      v12 = 983040;
    _BitScanReverse(&v29, v12 - 1);
    v30 = v29 + 1;
    if( v30 > 7 )
      v11 = v30;
    v35 = v11;
    if( v11 < 0x12 )
      v13 = v11;
    if( v13 <= 0xC )
      LOBYTE(v13) = 12;
    if( v21 > 1 << v13 )
      v21 = 1 << v13;
  }
  if( (v5 & 1) != 0 )
    v22 = -1;
  else
    v22 = RtlpHpAcquireLockShared((_EX_PUSH_LOCK *)(a1 + 72), *(unsigned __int8 *)(a1 + 57));
  v23 = ((__int64(__fastcall *)(_QWORD, _QWORD, _QWORD, int *, int *))(a1 ^ RtlpHpHeapGlobals ^ *(_QWORD *)(a1 + 8)))(
          *(_QWORD *)a1,
          v21,
          v5,
          &v34,
          &v31);
  if( v23 )
  {
    if( v9 && (RtlpHpLfhPerfFlags & 2) != 0 || (v34 & 1) != 0 )
    {
      v24 = v21;
    }
    else
    {
      v27 = 2 * v33;
      v32 = 0;
      if( ((2 * v33 - 1) & (2 * v33)) != 0 )
      {
        _BitScanReverse(&v28, v27);
        v32 = v28 + 1;
        v27 = 1 << (v28 + 1);
      }
      if( v27 <= 0x1000 )
        v27 = 4096;
      v24 = v21;
      if( v27 < v21 )
        v24 = v27;
    }
    if( ((int(__fastcall *)(_QWORD, INT64, _QWORD))(a1 ^ RtlpHpHeapGlobals ^ *(_QWORD *)(a1 + 24)))(
           *(_QWORD *)a1,
           v23,
           v24) < 0 )
    {
      v25 = 0;
    }
    else
    {
      RtlpHpLfhSubsegmentInitialize(v23, v21, v24, v33, a1);
      _InterlockedIncrement64((volatile signed __int64 *)(a2 + 64));
      _InterlockedExchangeAdd64((volatile signed __int64 *)(a2 + 56), *(unsigned __int16 *)(v23 + 34));
      v25 = v23;
      v23 = 0i64;
    }
    if( v23 )
      ((void(__fastcall *)(_QWORD, INT64, _QWORD, _QWORD))(a1 ^ RtlpHpHeapGlobals ^ *(_QWORD *)(a1 + 16)))(
        *(_QWORD *)a1,
        v23,
        v21,
        v5);
  }
  else
  {
    v25 = 0;
  }
  if( (v5 & 1) == 0 )
  {
    if( *(_BYTE *)(a1 + 57) )
    {
      ExReleaseSpinLockSharedFromDpcLevel((PEX_SPIN_LOCK)(a1 + 72));
      __writecr8(v22);
    }
    else
    {
      if( _InterlockedCompareExchange64((volatile signed __int64 *)(a1 + 72), 0i64, 17i64) != 17 )
        ExfReleasePushLockShared((_EX_PUSH_LOCK *)(a1 + 72));
      KeAbPostRelease((VOID *)(a1 + 72));
      KiLeaveGuardedRegionUnsafe((__int64)KeGetCurrentThread());
    }
  }
  return v25;
}

Referenced by: