llvm-project

858afe90 - Revert "[RISCV] Add isel optimization for (and (sra y, c2), c1) to recover regression from #101751. (#104114)"

Revert "[RISCV] Add isel optimization for (and (sra y, c2), c1) to recover regression from #101751. (#104114)" This caused an assert to fire: llvm/include/llvm/Support/Casting.h:566: decltype(auto) llvm::cast(const From &) [To = llvm::ConstantSDNode, From = llvm::SDValue]: Assertion `isa<To>(Val) && "cast<Ty>() argument of incompatible type!"' failed. see comment on the PR. > If c1 is a shifted mask with c3 leading zeros and c4 trailing zeros. If > c2 is greater than c3, we can use (srli (srai y, c2 - c3), c3 + c4) > followed by a SHXADD with c4 as the X amount. > > Without Zba we can use (slli (srli (srai y, c2 - c3), c3 + c4), c4). > Alive2: https://alive2.llvm.org/ce/z/AwhheR This reverts commit 514481736cf943464125ef34570a7df0a19290de.