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| author | Arthur Perais <arthur.perais@inria.fr> | 2016-12-21 15:05:24 -0600 |
|---|---|---|
| committer | Arthur Perais <arthur.perais@inria.fr> | 2016-12-21 15:05:24 -0600 |
| commit | 1664625db89c3c9054434b5dc97a9f1c1bfad244 (patch) | |
| tree | 7fd4b62126246deccc2b3b21bf80e2e406d65b66 /src/cpu/o3/fetch.cc | |
| parent | e5fb6752d613a6f85e2f93b4c01836ac59a8c90c (diff) | |
| download | gem5-1664625db89c3c9054434b5dc97a9f1c1bfad244.tar.xz | |
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>
Diffstat (limited to 'src/cpu/o3/fetch.cc')
0 files changed, 0 insertions, 0 deletions