Nikita Popov 9a9421a461 Reapply [InstCombine] Fold multiuse shr eq zero ...

This was reverted due to performance regressions in ARM benchmarks,
which have since been addressed by D101196 (SCEV analysis improvement)
and D101778 (CGP reverse transform).

-----

The single-use case is handled implicity by converting the icmp
into a mask check first. When comparing with zero in particular,
we don't need the one-use restriction, as we only produce a single
icmp.

https://alive2.llvm.org/ce/z/MSixcm
https://alive2.llvm.org/ce/z/GwpG0M

2021-05-22 14:46:50 +02:00

2.6 KiB

Raw Blame History

View Raw