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lower = pMask->lower & occ;
upper = pMask->upper & occ;
ms1B = C64(0x8000000000000000u0x8000000000000000) >> lzcnt(lower | 1); // ms1b of lower (at least bit zero)
// ls1b = upper & -upper;
// odiff = 2 * ls1b - ms1B;
