Hi Nick, On Sun, Dec 08, 2019 at 03:03:56PM -0500, Nicholas Krause wrote: > The first questions are: > 1. What current heuristics do we have as it seems none for figuring out > what state is shared > as it seems none? If I correct the first thing to do is discuss what > bits/bitmasks we want > for figuring out shared state or other ways.
Shared between what and what? > 2. MD files seem to be a major source of shared state or reading them. > Is it possible > to read from them async? Doesn't seem to be a problem but the current > docs don't > mention it nor does it seem easy to do. MD files are not read *at all* by the compiler itself; they aren't installed, even. They are read by the gen* programs when the compiler itself is built, to create the insn-*.c files and the like. > 3. There are two ways to write this for RTL either one class for all the > state or a core > class will each major part being a subclass like delayed branch > scheduling e.t.c.Not sure > which is better so thought I would ask. RTL as it is is pretty efficient. Please keep it that way. It also is a dumb (and very "open") data structure, by design. See how "XEXP" and similar work. That could be changed of course, for non-trivial cost, but what for? Segher
