[PATCH] Add statistics counting to PHI-OPT

Andrew Pinski pinskia@gmail.com
Fri Jun 18 07:48:34 GMT 2021


On Fri, Jun 11, 2021 at 12:51 AM Richard Biener via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> On Fri, Jun 11, 2021 at 6:15 AM apinski--- via Gcc-patches
> <gcc-patches@gcc.gnu.org> wrote:
> >
> > From: Andrew Pinski <apinski@marvell.com>
> >
> > This should have been done before I started to work on connecting
> > PHI-OPT to match-and-simplify to see quickly if we miss anything
> > but it is better late than never.
> > Anyways there was no statistics counting in PHI-OPT before so adding
> > it is the right thing to do.
> >
> > OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
>
> OK (minor nit - the strings have inconsistent starting with/without caps)

So I looked into statistics_counter_event usage and noticed they are
very inconsistent starting with/without caps. It seems like the
original usage of it was with a caps and then over time people added
some without.
We should have a rule somewhere about this; note I am NOT going to implement it.

Thanks,
Andrew


>
> Thanks,
> Richard.
>
> > gcc/ChangeLog:
> >
> >         * tree-ssa-phiopt.c (replace_phi_edge_with_variable):
> >         Add counting of how many times it is done.
> >         (factor_out_conditional_conversion): Likewise.
> >         (match_simplify_replacement): Likewise.
> >         (value_replacement): Likewise.
> >         (spaceship_replacement): Likewise.
> >         (cond_store_replacement): Likewise.
> >         (cond_if_else_store_replacement_1): Likewise.
> >         (hoist_adjacent_loads): Likewise.
> > ---
> >  gcc/tree-ssa-phiopt.c | 17 +++++++++++++++++
> >  1 file changed, 17 insertions(+)
> >
> > diff --git a/gcc/tree-ssa-phiopt.c b/gcc/tree-ssa-phiopt.c
> > index 76f4e7ec843..02e26f974a5 100644
> > --- a/gcc/tree-ssa-phiopt.c
> > +++ b/gcc/tree-ssa-phiopt.c
> > @@ -419,6 +419,8 @@ replace_phi_edge_with_variable (basic_block cond_block,
> >    gsi = gsi_last_bb (cond_block);
> >    gsi_remove (&gsi, true);
> >
> > +  statistics_counter_event (cfun, "Replace PHI with variable", 1);
> > +
> >    if (dump_file && (dump_flags & TDF_DETAILS))
> >      fprintf (dump_file,
> >               "COND_EXPR in block %d and PHI in block %d converted to straightline code.\n",
> > @@ -618,6 +620,9 @@ factor_out_conditional_conversion (edge e0, edge e1, gphi *phi,
> >    /* Remove the original PHI stmt.  */
> >    gsi = gsi_for_stmt (phi);
> >    gsi_remove (&gsi, true);
> > +
> > +  statistics_counter_event (cfun, "factored out cast", 1);
> > +
> >    return newphi;
> >  }
> >
> > @@ -893,6 +898,11 @@ match_simplify_replacement (basic_block cond_bb, basic_block middle_bb,
> >
> >    replace_phi_edge_with_variable (cond_bb, e1, phi, result);
> >
> > +  /* Add Statistic here even though replace_phi_edge_with_variable already
> > +     does it as we want to be able to count when match-simplify happens vs
> > +     the others.  */
> > +  statistics_counter_event (cfun, "match-simplify PHI replacement", 1);
> > +
> >    /* Note that we optimized this PHI.  */
> >    return true;
> >  }
> > @@ -1196,6 +1206,8 @@ value_replacement (basic_block cond_bb, basic_block middle_bb,
> >         }
> >        else
> >         {
> > +         statistics_counter_event (cfun, "Replace PHI with variable/value_replacement", 1);
> > +
> >           /* Replace the PHI arguments with arg. */
> >           SET_PHI_ARG_DEF (phi, e0->dest_idx, arg);
> >           SET_PHI_ARG_DEF (phi, e1->dest_idx, arg);
> > @@ -2320,6 +2332,7 @@ spaceship_replacement (basic_block cond_bb, basic_block middle_bb,
> >
> >    gimple_stmt_iterator psi = gsi_for_stmt (phi);
> >    remove_phi_node (&psi, true);
> > +  statistics_counter_event (cfun, "spaceship replacement", 1);
> >
> >    return true;
> >  }
> > @@ -2982,6 +2995,7 @@ cond_store_replacement (basic_block middle_bb, basic_block join_bb,
> >        fprintf (dump_file, "\nInserted a new PHI statement in joint block:\n");
> >        print_gimple_stmt (dump_file, new_stmt, 0, TDF_VOPS|TDF_MEMSYMS);
> >      }
> > +  statistics_counter_event (cfun, "conditional store replacement", 1);
> >
> >    return true;
> >  }
> > @@ -3056,6 +3070,8 @@ cond_if_else_store_replacement_1 (basic_block then_bb, basic_block else_bb,
> >    else
> >      gsi_insert_before (&gsi, new_stmt, GSI_NEW_STMT);
> >
> > +  statistics_counter_event (cfun, "if-then-else store replacement", 1);
> > +
> >    return true;
> >  }
> >
> > @@ -3469,6 +3485,7 @@ hoist_adjacent_loads (basic_block bb0, basic_block bb1,
> >        gsi_move_to_bb_end (&gsi2, bb0);
> >        gsi2 = gsi_for_stmt (def2);
> >        gsi_move_to_bb_end (&gsi2, bb0);
> > +      statistics_counter_event (cfun, "hoisted loads", 1);
> >
> >        if (dump_file && (dump_flags & TDF_DETAILS))
> >         {
> > --
> > 2.27.0
> >


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