On Thu, 2010-06-24 at 08:57 -0600, Jeff Law wrote: > On 06/24/10 02:02, Revital1 Eres wrote: > > Hello, > > > > In the new target I'm working on there are branch regs and gprs. > > The loads and store instructions are only to/from the gprs, so if a > > branch reg needs to be spilled it first needs to be moved to a gpr and > > then stored to memory. I've implemented mov pattern in the machine > > description file for the gprs and a mov pattern between gprs and branch > > regs; however I'm am not sure if I need to add more to model the behavior > > described above and if so how to do it. > > > Secondary reloads is the answer. > > This isn't a terribly uncommon situation. Handling of the shift > register (SAR) on the PA would be a good example. You can move the SAR > to/from a GPR, but SAR can not be stored directly to memory. Searches > for SAR in pa.c will get you a long way.
The same is true for the condition register on PowerPC. Peter
