On Sun, Apr 17, 2016 at 9:13 AM, Jan Hubicka <hubi...@ucw.cz> wrote: > Hi, > this patch fixes infrastructure used by branch prediction code to collect > information about prediction hitrates that is needed to verify their > performance. > > We used to read profile first and then do profile estimation, nowdays passes > are run in the opposite order. Because dumping happens during estimation, we > no longer get the information. This patch simply re-runs the branch > prediction > w/o modifying the profile when -fdump-ipa-profile is used. > > Profile estimation and maintenance code was not very actively developed > in recent years and there are some dead ends. This stage 1 I would like to fix > them, update the APIs to be more robust and use sreals instaed of fixedpoint > arithmetics. > > Bootstrapped/regtested x86_64-linux, comitted. > > Honza > > * predict.c (combine_predictions_for_bb): Add dry_run parmaeter. > (tree_estimate_probability): Likewise. > (pass_profile::execute): Update. > (report_predictor_hitrates): New function. > * profile.c (compute_branch_probabilities): Use it. > * predict.h (report_predictor_hitrates): Declare. > > * analyze_brprob: Update comment.
This caused: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70706 -- H.J.
