> Is VRP the right pass to do this optimisation or should a later > pass rather attempt to eliminate the new use of b_5 instead? Uli > has brought up the idea a mini "sign extend elimination" pass that > checks if the result of a sign extend could be replaced by the > original quantity in all places, and if so, eliminate the ssa > name.
Did you try to enable -free on s390x? It's a RTL pass. -- Eric Botcazou
