Richard Hulme <pepe...@yahoo.com> writes: > Is there any way of preventing the compiler going with the indirect > alternative? Can a 'parallel' match be defined in the machine > description that indicates the '(set (reg/f:HI...' should be discarded?
No, that wouldn't work. The register is only dead if both combinations take place. Neither combine nor the target code knows when doing the first combination whether all other uses of the register can also be combined. Combine just isn't designed for this kind of global optimisation. It sounds like something that fwprop should do instead. Thanks, Richard
