On Fri, 2013-09-20 at 07:39 +0100, Richard Sandiford wrote: > Well, it's really backend code that works out what registers need > to be saved and restored, although it's based on generic information. > So it should just be a case of making mips_save_reg_p return true for > all FP registers in an fp64_compat function. The prologue would then > need to restore any incoming float arguments after the mode switch. > > Thanks, > Richard
Thanks for the ideas Richard, I have played around with this some more and one of the things I am having trouble with is trying to determine if any floating point registers were used for arguments. I could just save and restore $f12 and $f14 every time, but ideally I would only want to do that if they were actually used for arguments. I can't seem to figure out how to determine that. It looks like I can determine if $f0 is used for a return value by using mips_return_mode_in_fpr_p but I can't find something equivalent for argument registers. Any ideas? Steve Ellcey [email protected]
