uint FUN_004011e0(int param_1,byte param_2,ushort *param_3,uint param_4)

{

  ushort uVar1;

  int iVar2;

  uint uVar3;

  ushort *puVar4;

  int iVar5;

  uint uVar6;

  uint uVar7;

  uint uVar8;

  uVar6 = (param_4 & 0xff) << 8 | (param_4 & 0xffff) >> 8;

  puVar4 = (ushort *)(param_1 + 8);

  uVar8 = 0;

  iVar2 = 0x20;

  do {

    iVar2 = iVar2 + -2;

    uVar8 = uVar8 + *puVar4;

    puVar4 = puVar4 + 1;

  } while (iVar2 != 0);

  while( true ) {

    if ((int)uVar8 >> 0x10 == 0) break;

    uVar8 = ((int)uVar8 >> 0x10) + (uVar8 & 0xffff);

  }

  uVar3 = (uint)param_2 << 8;

  do {

    uVar7 = uVar6 + uVar3;

    uVar6 = (int)uVar7 >> 0x10;

    uVar3 = uVar7 & 0xffff;

  } while (uVar6 != 0);

  uVar6 = 0;

  iVar2 = 0;

  while( true ) {

    iVar5 = (param_4 & 0xffff) - iVar2;

    iVar2 = iVar2 + 2;

    if (iVar5 < 2) break;

    uVar1 = *param_3;

    param_3 = param_3 + 1;

    uVar6 = uVar6 + uVar1;

  }

  if (iVar5 == 1) {

    uVar6 = (byte)*param_3 + uVar6;

  }

  while( true ) {

    if ((int)uVar6 >> 0x10 == 0) break;

    uVar6 = ((int)uVar6 >> 0x10) + (uVar6 & 0xffff);

  }

  uVar6 = (uVar7 & 0xffff) + (uVar8 & 0xffff) + (uVar6 & 0xffff);

  uVar6 = (uVar6 & 0xffff) + (uVar6 >> 0x10);

  uVar6 = ~((uVar6 >> 0x10) + uVar6) & 0xffff;

  if (uVar6 == 0) {

    uVar6 = 0xffff;

  }

  return uVar6;

}