On Sun, Apr 09, 2017 at 03:52:30PM -0500, Daniel Santos wrote: > So I've been browsing through the gcc docs for other archs and > noticed that they all use different terminology for their options that > call or jump to stubs as a substitute for emitting inline saves & > restores for registers. > > ARC: -mno-millicode > AVR: -mcall-prologues > V850: -mno-prolog-function(enabled by default) > > I think that PowerPC/rs6000 does this without an option (or maybe in -Os?).
The rs6000 ports determines what to do in function rs6000_savres_strategy. Whether or not to do inline saves is different per kind of registers (integer, float, vector), per ABI, and depends on other factors as well: we always inline if it is just as small, we always inline if the outline routines wouldn't work, and indeed for some ABIs we inline unless -Os was used. There are some more considerations. But yes, there is no option to force different code generation. This is a good thing. Segher
