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| author | Mitch Hayenga <mitch.hayenga@arm.com> | 2014-09-03 07:42:34 -0400 |
|---|---|---|
| committer | Mitch Hayenga <mitch.hayenga@arm.com> | 2014-09-03 07:42:34 -0400 |
| commit | 1716749c8cec6f9c9f10a0aeaff981be759bb4e5 (patch) | |
| tree | 0e789e02e642227ae170a18782daf05666f7316a /src/cpu/o3/comm.hh | |
| parent | 976f27487b57e968a326752fcf74747427733df6 (diff) | |
| download | gem5-1716749c8cec6f9c9f10a0aeaff981be759bb4e5.tar.xz | |
cpu: Fix o3 front-end pipeline interlock behavior
The o3 pipeline interlock/stall logic is incorrect. o3 unnecessicarily stalled
fetch and decode due to later stages in the pipeline. In general, a stage
should usually only consider if it is stalled by the adjacent, downstream stage.
Forcing stalls due to later stages creates and results in bubbles in the
pipeline. Additionally, o3 stalled the entire frontend (fetch, decode, rename)
on a branch mispredict while the ROB is being serially walked to update the
RAT (robSquashing). Only should have stalled at rename.
Diffstat (limited to 'src/cpu/o3/comm.hh')
| -rw-r--r-- | src/cpu/o3/comm.hh | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/src/cpu/o3/comm.hh b/src/cpu/o3/comm.hh index ab0a9ff42..a425484f5 100644 --- a/src/cpu/o3/comm.hh +++ b/src/cpu/o3/comm.hh @@ -229,8 +229,6 @@ struct TimeBufStruct { bool renameUnblock[Impl::MaxThreads]; bool iewBlock[Impl::MaxThreads]; bool iewUnblock[Impl::MaxThreads]; - bool commitBlock[Impl::MaxThreads]; - bool commitUnblock[Impl::MaxThreads]; }; #endif //__CPU_O3_COMM_HH__ |