423     U32    const btMask = (1 << btLog) - 1;  in ZSTD_insertBt1()  local
433     const U32 btLow = btMask >= curr ? 0 : curr - btMask;  in ZSTD_insertBt1()
434     U32* smallerPtr = bt + 2*(curr&btMask);  in ZSTD_insertBt1()
445     U32 predictedSmall = *(bt + 2*((curr-1)&btMask) + 0);  in ZSTD_insertBt1()
446     U32 predictedLarge = *(bt + 2*((curr-1)&btMask) + 1);  in ZSTD_insertBt1()
459         U32* const nextPtr = bt + 2*(matchIndex & btMask);  in ZSTD_insertBt1()
464 …const U32* predictPtr = bt + 2*((matchIndex-1) & btMask);   /* written this way, as bt is a roll b…  in ZSTD_insertBt1()
577     U32 const btMask= (1U << btLog) - 1;  in ZSTD_insertBtAndGetAllMatches()  local
583     U32 const btLow = (btMask >= curr) ? 0 : curr - btMask;  in ZSTD_insertBtAndGetAllMatches()
586     U32* smallerPtr = bt + 2*(curr&btMask);  in ZSTD_insertBtAndGetAllMatches()
587     U32* largerPtr  = bt + 2*(curr&btMask) + 1;  in ZSTD_insertBtAndGetAllMatches()
690         U32* const nextPtr = bt + 2*(matchIndex & btMask);  in ZSTD_insertBtAndGetAllMatches()