Andrew Waterman d0c6cbba6b Improve frontend branch prediction ... - Put correctness responsibility on Frontend, not IBuf, for improved separation of concerns. Frontend must detect case that the BTB predicts a taken branch in the middle of an instruction. - Pass BTB information down pipeline unconditionally, fixing case that screws up the branch history when the BTB misses and the instruction is misaligned. - Remove jumpInFrontend option; it's now unconditional. - Default to one-bit counters in the BHT. For tiny BHTs like these, it's more resource efficient to have a larger index space than to have hysteresis.		2017-11-09 00:00:56 -08:00
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scala	Improve frontend branch prediction	2017-11-09 00:00:56 -08:00