65% regression on Banana Pi F3 on Shootout-C++-matrix
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backend:RISC-V
vectorizers
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Description
Between f089c0fe9117ccbf9abc439722354873b417e104 and ac90ab67b800876c367290abfd3c7df9ae99a94b there's been a 65% performance regression on SingleSource/Benchmarks/Shootout-C++/Shootout-C++-matrix, with `-march=rva22u64_v -O3 -flto`. The P550 machine didn't regress so I presume this is related to vectorization.
https://cc-perf.igalia.com/db_default/v4/nts/profile/303/482/478
https://cc-perf.igalia.com/db_default/v4/nts/graph?highlight_run=482&plot.303=4.303.3
I think there were some changes to SLP vectorization recently, not sure if that's related cc) @alexey-bataev @bababuck
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