[PATCH] Add stats to simple_dce_from_worklist

[Andrew Pinski via Gcc-patches]

While looking to move substitute_and_fold_engine
over to use simple_dce_from_worklist, I noticed
that we don't record the stats of the removed stmts/phis.
So this does that.

OK? Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

        * tree-ssa-dce.cc (simple_dce_from_worklist): Record
        stats on removed number of statements and phis.
---
 gcc/tree-ssa-dce.cc | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/gcc/tree-ssa-dce.cc b/gcc/tree-ssa-dce.cc
index 1fd88e8ee37..86a33e1a40d 100644
--- a/gcc/tree-ssa-dce.cc
+++ b/gcc/tree-ssa-dce.cc
@@ -2099,6 +2099,8 @@ make_pass_cd_dce (gcc::context *ctxt)
 void
 simple_dce_from_worklist (bitmap worklist)
 {
+  long phiremoved = 0;
+  long stmtremoved = 0;
   while (! bitmap_empty_p (worklist))
     {
       /* Pop item.  */
@@ -2144,12 +2146,20 @@ simple_dce_from_worklist (bitmap worklist)
        }
       gimple_stmt_iterator gsi = gsi_for_stmt (t);
       if (gimple_code (t) == GIMPLE_PHI)
-       remove_phi_node (&gsi, true);
+       {
+         remove_phi_node (&gsi, true);
+         phiremoved++;
+       }
       else
        {
          unlink_stmt_vdef (t);
          gsi_remove (&gsi, true);
          release_defs (t);
+         stmtremoved++;
        }
     }
+  statistics_counter_event (cfun, "PHIs removed",
+                           phiremoved);
+  statistics_counter_event (cfun, "Statements removed",
+                           stmtremoved);
 }
-- 
2.39.1