| Issue |
124499
|
| Summary |
rva22u64_v regression on 525.x265_r
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
lukel97
|
Between 6e498bc2cd765f4c421d32d610bdc0effec62b42 and c7579bfba5969377f7fb4239cc05d6cd4a077957, the SPEC CPU 2017 benchmark 525.x264_r has regressed about ~9% on the spacemit-x60: https://lnt.lukelau.me/db_default/v4/nts/graph?highlight_run=133&plot.0=25.13.3
It looks like this is made up of several independent regressions over the last few days since the 23rd of January, the first one being a 6% regression between 6e498bc2cd765f4c421d32d610bdc0effec62b42 and 26fc07d5d88760ad659599184fd10181287d2d9e.
The cause of the regression is mostly due to the function `pixel_hadamard_ac` being unprofitably SLP vectorized in a lot more places, which can be viewed in the profile here: https://lnt.lukelau.me/db_default/v4/nts/profile/13/133/130
Noticeably there are now 8 new LMUL 4 `vrgatherei16.vv`s which are very expensive.
There were a few SLP related changes landed during this period which may be relevant, #123896 #124254 #124129.
Are we missing something from the RISC-V cost-model? cc) @alexey-bataev @RKSimon @HanKuanChen
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