On 06/14/2010 07:58 PM, Ian Lance Taylor wrote: > "Amker.Cheng" <amker.ch...@gmail.com> writes: > >> Wondering whether possible to handle multi-word mode with more accuracy, >> in either subreg or IRA pass? > > Yes, it is possible. What you need to do is to write a split which > turns the mult:DI insn into an insn which sets two separate subregs.
Is it valid to have an insn set two different subregs of the same pseudo in parallel? I have the same problem on ARM, but I couldn't convince myself that writing such a split was safe so I'm currently trying to solve the problem in the register allocator. Bernd
