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| H A D | decode_impl.hh | diff 11781:1ae84c76066b Wed Dec 21 16:05:00 EST 2016 Arthur Perais <arthur.perais@inria.fr> cpu: Resolve targets of predicted 'taken' decode for O3 The target of taken conditional direct branches does not need to be resolved in IEW: the target can be computed at decode, usually using the decoded instruction word and the PC. The higher-than-necessary penalty is taken only on conditional branches that are predicted taken but miss in the BTB. Thus, this is mostly inconsequential on IPC if the BTB is big/associative enough (fewer capacity/conflict misses). Nonetheless, what gem5 simulates is not representative of how conditional branch targets can be handled. Signed-off-by: Jason Lowe-Power <jason@lowepower.com> |
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