> -----Ursprüngliche Nachricht----- > Von: Jeff Law <law@xxxxxxxxxx> > Gesendet: Montag, 30. September 2019 18:23 > An: stefan@xxxxxxxxx; gcc-help@xxxxxxxxxxx > Betreff: Re: make static method find_reloads_address_1(...) extern > accessible > > On 9/30/19 6:17 AM, stefan@xxxxxxxxx wrote: > > I've implemented LEGITIMIZE_RELOAD_ADDRESS and that implementation > is > > calling find_reloads_address_1. > > > > My implementation adds double indirect addressing to the m68k target > > and since the use of an outer index register or offset depends on the > > use of an inner index register or offset, since only one index > > register and one offset is allowed per address. => The recursive > > reload implementation does not work. So the > LEGITIMIZE_RELOAD_ADDRESS > > takes care of the whole address at once. > > > > How are the chances that a static method of reload is converted into > > an extern accessible method, if a patch would requires it? > If all you need is to make the routine visible, that may be OK. THe biggest > worry is any data structures used by find_reloads_address_1 and it's children > and whether or not that data is valid. It seems to work, passes the gcc.c-torture/execute tests... > The bigger concern I have is that we're on a path to drop reload and instead > use LRA. So there's a good chance that the work you do in this space doesn't > have a significant lifetime -- doing it in LRA would be better, at least in theory > -- and at least one other port would like to support double indirect > addressing in LRA. > > The natural question is whether or not m68k can use LRA instead of reload. > That's predicated on converting the m68k from cc0 to MODE_CC for > representing the condition codes. Nobody is currently signed up to do this > work and if nobody steps up, the m68k port will end up deprecated. There's a bounty on bountysource for this: https://www.bountysource.com/issues/80706251-m68k-convert-the-backend-to-mode_cc-so-it-can-be-kept-in-future-releases And I am confident that an adequate implementation for LRA can be done. Should I use the gcc development master branch (version 10 atm) or something stable for LRA? Stefan
