llvm-project

ea61110c - [AArch64][SVE2] Allow commuting two-input NBSL/BSL2N idioms. (#184847)

[AArch64][SVE2] Allow commuting two-input NBSL/BSL2N idioms. (#184847) Specifically, EON, NAND and NOR are commutable operations that lack dedicated SVE2 instructions, but we support them via NBSL/BSL2N. However, as NBSL/BSL2N have tied operands, sometimes we generate a COPY even if one of the operands could be clobbered. This patch defines custom expansion for these operations to allow using their commuted forms or, if still necessary, using MOVPRFX for the COPY. Should help with https://github.com/llvm/llvm-project/pull/176194#discussion_r2889564685.