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Breaks -That stalls the pipeline
Branch^= IF A=0 THEN X=X+1 ELSE X=X-1, hoppar till olika instruktioner A=0 eller inte
Branch taken= If the result indicates that we have to jump and the instructions before is wrong, so we set the right one that leads to penalty
Branch not taken= If the result is equals to the guessed instructions that comes after, so we continue with manage them that leads to no penalty
It is always good to fetch even if it leads to penalties
-Tanken med delayed branching är att låta processorn göra ngt istället för att göra stall
-Den instruktione efter hoppet exeveras bara om hoppet inte tas
-Branch slot=Insktruktioenr som hamnar efter ett hopp men som exeveras oavsett utgånh av hoppet sägs ligga i branch delay slot
BTB =Branch target buffer
-Den tar den senaste PC(program counter) lägger in det i en tabell. Det som vi tar ut är den bästa gissningen av vad som nästa PC kommer att vara. Det tar med sig PC och predicted PC genom pipeline(detta sker i fetch). Senare i pipelinen har vi den rätta PC_new och vi jämför den rätta med den som är predicted. Ifall det är fel så kommer det vara missprediction penalty. Vi uppdaterar BTB med den nya PC:n ifall det kommer samma branch så kommer den förhoppningsvis vara den PC:n
Taken/ not taken=?
Program counter (PC) is a CPU register in the computer processor which has the address of the next instruction to be executed from memory.
Branch prediction
-Is it a branch
-Is it taken
- If taken, what is the target PC
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