| Issue |
122681
|
| Summary |
RISC-V EVL tail folding failure on SPEC CPU 2017 525.x264_r
|
| Labels |
backend:RISC-V,
vectorizers
|
| Assignees |
|
| Reporter |
lukel97
|
Split out from the discussion here: https://github.com/llvm/llvm-project/pull/122458#issuecomment-2585713670
On RISC-V with `-march=rva22u64_v -O3 -flto -mllvm -force-tail-folding-style=data-with-evl -mllvm -prefer-predicate-over-epilogue=predicate-else-scalar-epilogue`, the SPEC CPU 2017 525.x264_r benchmark fails in the train dataset, likely due to a miscompile.
It's been failing since at least 6ad0dcf67f5dccdf8506ce5f51d793062a1c6879, detected from this LNT run: https://lnt.lukelau.me/db_default/v4/nts/89
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