Sorry, sent an incomplete email. it was missing this part: On Thu, Nov 25, 2021 at 03:12:32PM -0600, Segher Boessenkool wrote: > > +;; int fegetround(void) > > +;; > > +;; This expansion for the C99 function only expands for compatible > > +;; target libcs. Because it needs to return one of FE_DOWNWARD, > > +;; FE_TONEAREST, FE_TOWARDZERO or FE_UPWARD with the values as defined > > +;; by the target libc, and since they are free to > > +;; choose the values and the expand needs to know then beforehand, > > +;; this expand only expands for target libcs that it can handle the > > +;; values is knows. > > +;; Because of these restriction, this only expands on the desired > > +;; case and fallback to a call to libc on any otherwise. > > +(define_expand "fegetroundsi" > > (This needs some wordsmithing.)
How about something like this? It is just a light editing of the above: ;; This expansion for the C99 function only expands for compatible ;; target libcs, because it needs to return one of FE_DOWNWARD, ;; FE_TONEAREST, FE_TOWARDZERO or FE_UPWARD with the values as defined ;; by the target libc, and since the libc is free to choose the values ;; (and they may differ from the hardware) and the expander needs to ;; know then beforehand, this expanded only expands for target libcs ;; that it can handle the values is knows. ;; Because of these restriction, this only expands on the desired ;; case and fallback to a call to libc otherwise. o/ Raoni
