llvm-project

91e85cc9 - [RISCV] Use arithmetic for select c, 0, simm12 even with zicond (#156957)

[RISCV] Use arithmetic for select c, 0, simm12 even with zicond (#156957) The arithmetic expansion requires fewer registers, and is often fewer instructions. The critical path does increase by (up to) one instruction. This is a sub-case of the expansion we do without zicond, but restricted specifically to the simm12 case. In the general case where the other source is a register using zicond is likely better. (Edit: While technically true, this is a bit misleading, we do this in combineSelectToBinOp which is also used in the zicond path, just further down.)