Pretty serious perf regressions in opt benchmarks

[ljedrz]

It appears that one of the changes today caused serious regressions in some of the opt benches, mostly patched incremental:

regex-opt        | avg: 61.3% | min: -0.0% | max: 330.1%
webrender-opt    | avg: 78.2% | min: -0.0% | max: 312.6%
piston-image-opt | avg: 73.3% | min: -0.4% | max: 293.4%
ripgrep-opt      | avg: 31.3% | min: -0.1% | max: 125.3%

[Mark-Simulacrum]

868b51b...b2c1a60 is the commit range, but I think this is #71248? (That at least seems logical to me).

We should have perf results soonish as they populate in...

[ljedrz]

Yes, seems to be the same thing; feel free to close this issue once it's confirmed, I seem to have missed the previous one 😛 .

[jonas-schievink]

New commit range: 868b51b...318726b

Updated perf: https://perf.rust-lang.org/compare.html?start=868b51be6f29d5b43d37c5d65bac1482d3a50ad8&end=318726b301db2a0718d05f166d3d6c578273189c&stat=instructions:u

Closing in favor of #71248