Re: How does the register allocator supports modulo scheduled code?

[Andrew Haley <aph at redhat dot com>]

Jan Hubicka writes:
 > > 
 > >    We have done the modulo scheduling for the loops and added that to the 
 > > gcc instruction scheduler. We have replaced the loop block with our 
 > > scheduled code and it is working fine. But now when this is passed to the 
 > > gcc register allocator, we are getting errors in reload pass. Will the gcc 
 > > register allocator can not handle this modulo scheduled code?
 > 
 > What kind of errors do you get exactly?  In case the insturctions you
 > produced match the constraints it should work just OK.  In case they
 > don't reload won't be able to fix up the hard registers.

Surely this can't work because reload will mess up the carefully
arranged schedule.

Andrew.