> > My original post was trying to point out an instance where LRA is not > performing as well as reload. Although I can avoid this for mips16 it may well > occur in other circumstances but not be as noticeable. Is this something > worth pursuing? > > > Yes, it is worth pursuing. Whatever reload does to improve code of IRA, it > can be better done by global register allocator as it sees all picture not > just a > local context. > > Besides right hard reg move cost value problem, finding reg class for pseudos > (in IRA or in the old RA) has some pitfalls which can be generally fixed only > by > early choosing insn alternatives before RA. For example, I know that a > problem with better use of ARM neon registers could be fixed by this. But it > is a bit different story about early code selection.
I have posted a test case and further details in bug 58461. It includes my proposed fix to register allocation for mips16 as well but that is a secondary issue. Regards, Matthew
