On Thu, Aug 11, 2011 at 3:27 PM, Vladimir Makarov <vmaka...@redhat.com> wrote: > Yes, that is mostly correct. The first could be done by -fweb (if the live > range where the pseudo is equal to the constant is disjoint). The first > could be done also by Jeff Law's project which can provide splitting not > only on the border of loops. >
I was thinking that one possible solution in the short term would be to add a new pass just before IRA which does constant assignment moves. So, an insn where a register which is assigned a constant can be moved as much as possible to the place right before the use of the register or if there's no use of the register inside the current BB, it can be moved as the last instruction of the BB. What do you think about this? Would this work? I know it's not very general, however, it's useful at least for my backend to get this right as soon as possible due to several size test failures we have which are a consequence of this problem. Paulo Matos
