------- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-07 03:39 ------- (In reply to comment #1) > builtin_expect uses PROB_VERY_LIKELY. > > But powerpc64 only emits branch prediction hints when at 2% / 98%. See > rs6000.c:output_cbranch This is a target problem as mentioned above.
Hmm, I thought there was a patch floating around to fix this but I could be wrong. Also note this changed back in 2002 for power4: <http://gcc.gnu.org/ml/gcc-patches/2002-08/msg00149.html> so in a way it could be considered a regression. It also effects power5 also (and ppc970). -- What |Removed |Added ---------------------------------------------------------------------------- CC| |pinskia at gcc dot gnu dot | |org Component|tree-optimization |target GCC target triplet|powerpc64-unknown-linux-gnu |powerpc*-*-* Summary|__builtin_expect doesnt |__builtin_expect does not |modify branch prediction for|modify branch prediction for |power4 target |power4/5 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19803
