Could the answer be to define the macro CALL_USED_REGISTERS with all bits set to 1 ? On Wed, Aug 7, 2019 at 11:57 AM Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> wrote: > > [ top-post not please do ] > > On Wed, Aug 07, 2019 at 10:48:58AM -0500, William Tambe wrote: > > To expand on my previous reply, I would like to configure GCC so that > > a callee does not need to save and restore registers that it is using > > other than the frame-pointer and return-pointer registers. > > The callee would not need to save and restore registers that it is > > using because it would be assumed that the caller has saved all > > registers that it is using. > > Then you need to define a new ABI for your target, and implement that > in your target's GCC backend. > > > Segher
