Backport "eq of parts" fold with logical ops #113
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We currently only handle this with a bitwise and/or instruction, but not a logical. (cherry picked from commit be4b836)
The pattern matched here is too complex for the general logical and/or to bitwise and/or conversion to trigger. However, the fold is poison-safe, so match it with a select root as well: https://alive2.llvm.org/ce/z/vNzzSg https://alive2.llvm.org/ce/z/Beyumt (cherry picked from commit fafe5a6)
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LGTM. Does this need an upstream 13.x backport? Maybe not if it's just a nice-to-have optimization. |
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Argh, I didn't mean to squash this! I could force-push fix that, if we care... |
I think the repository settings can be changed (was it in branch protection?) to disable that mode. |
Yeah, this is just nice to have, so don't need an upstream backport.
Don't think it really matters... |
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More work on lowering LLVMIR to YKIR.
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While the actual optimization for rust-lang/rust#83585 is part of LLVM 13, it did not trigger for logical operations. This backports the necessary patch.
I figured it would make sense to backport this rather than wait for another release cycle.