https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80791
--- Comment #25 from Kewen Lin <linkw at gcc dot gnu.org> --- Author: linkw Date: Tue Jun 18 05:08:02 2019 New Revision: 272405 URL: https://gcc.gnu.org/viewcvs?rev=272405&root=gcc&view=rev Log: Add one target hook predict_doloop_p, it return true if we can predict it is possible to use a low-overhead loop, it can help ivopts to make some better decisions. PR middle-end/80791 * target.def (predict_doloop_p): New hook. * targhooks.h (default_predict_doloop_p): New declaration. * targhooks.c (default_predict_doloop_p): New function. * doc/tm.texi.in (TARGET_PREDICT_DOLOOP_P): New hook. * doc/tm.texi: Regenerate. * config/rs6000/rs6000.c (rs6000_predict_doloop_p): New function. (TARGET_PREDICT_DOLOOP_P): New macro. * tree-ssa-loop-ivopts.c (generic_predict_doloop_p): New function. Modified: trunk/gcc/ChangeLog trunk/gcc/config/rs6000/rs6000.c trunk/gcc/doc/tm.texi trunk/gcc/doc/tm.texi.in trunk/gcc/target.def trunk/gcc/targhooks.c trunk/gcc/targhooks.h trunk/gcc/tree-ssa-loop-ivopts.c
