llvm-project

ac6e1fd0 - [RISCV][TTI] Cost non-power-of-two size changing casts (#101047)

[RISCV][TTI] Cost non-power-of-two size changing casts (#101047) For a cast with src and destination size being unequal, we were costing the cast as if it were being scalarized, when in fact we can often promote such cases to a wider legal type. Note that for casts with equal size (i.e. bitcast, some fp<->i, and ptrtoint) the generic logic in BasicTTI already assumed promotion. It just doesn't handle the cast where source and destination are both promoted to non-equal types. This is analogous to d3fd28a, but with the same reasoning applied to casts instead.