[gcc r13-140] Remove loop-incremented dead code.

[Martin Liska <marxin@gcc.gnu.org>]

https://gcc.gnu.org/g:880456ed99d23ae76be4ecc929bcbcf8cae5eb66

commit r13-140-g880456ed99d23ae76be4ecc929bcbcf8cae5eb66
Author: Martin Liska <mliska@suse.cz>
Date:   Tue Apr 12 15:06:40 2022 +0200

    Remove loop-incremented dead code.
    
    gcc/ChangeLog:
    
            * genautomata.cc (create_composed_state): Remove dead code.
            * graphite-poly.cc (print_pdrs): Likewise.
            * lto-wrapper.cc (run_gcc): Likewise.
            * tree-switch-conversion.cc (switch_decision_tree::balance_case_nodes):
            Likewise.

Diff:
---
 gcc/genautomata.cc            | 21 +++++++++------------
 gcc/graphite-poly.cc          | 10 ----------
 gcc/lto-wrapper.cc            |  7 +------
 gcc/tree-switch-conversion.cc | 10 +++-------
 4 files changed, 13 insertions(+), 35 deletions(-)

diff --git a/gcc/genautomata.cc b/gcc/genautomata.cc
index e43314e4ea3..389c1c3e0ed 100644
--- a/gcc/genautomata.cc
+++ b/gcc/genautomata.cc
@@ -5661,7 +5661,6 @@ create_composed_state (state_t original_state, arc_t arcs_marked_by_insn,
   state_t state_in_table;
   state_t temp_state;
   alt_state_t canonical_alt_states_list;
-  int alts_number;
   int new_state_p = 0;
 
   if (arcs_marked_by_insn == NULL)
@@ -5731,17 +5730,15 @@ create_composed_state (state_t original_state, arc_t arcs_marked_by_insn,
 		      || (curr_arc->insn->insn_reserv_decl
 			  != DECL_INSN_RESERV (advance_cycle_insn_decl)))
 		    add_arc (state, curr_arc->to_state, curr_arc->insn);
-            }
-          arcs_marked_by_insn->to_state = state;
-          for (alts_number = 0,
-	       curr_arc = arcs_marked_by_insn->next_arc_marked_by_insn;
-               curr_arc != NULL;
-               curr_arc = next_arc)
-            {
-              next_arc = curr_arc->next_arc_marked_by_insn;
-              remove_arc (original_state, curr_arc);
-	      alts_number++;
-            }
+	    }
+	  arcs_marked_by_insn->to_state = state;
+	  for (curr_arc = arcs_marked_by_insn->next_arc_marked_by_insn;
+	       curr_arc != NULL;
+	       curr_arc = next_arc)
+	    {
+	      next_arc = curr_arc->next_arc_marked_by_insn;
+	      remove_arc (original_state, curr_arc);
+	    }
         }
     }
   if (!state->it_was_placed_in_stack_for_DFA_forming)
diff --git a/gcc/graphite-poly.cc b/gcc/graphite-poly.cc
index 42ed038768e..173aae07442 100644
--- a/gcc/graphite-poly.cc
+++ b/gcc/graphite-poly.cc
@@ -341,20 +341,10 @@ dump_gbb_conditions (FILE *file, gimple_poly_bb_p gbb)
 void
 print_pdrs (FILE *file, poly_bb_p pbb)
 {
-  int nb_reads = 0;
-  int nb_writes = 0;
-
   if (PBB_DRS (pbb).is_empty ())
     return;
 
   fprintf (file, "Data references (\n");
-
-  for (poly_dr_p pdr : PBB_DRS (pbb))
-    if (PDR_TYPE (pdr) == PDR_READ)
-      nb_reads++;
-    else
-      nb_writes++;
-
   fprintf (file, "Read data references (\n");
 
   for (poly_dr_p pdr : PBB_DRS (pbb))
diff --git a/gcc/lto-wrapper.cc b/gcc/lto-wrapper.cc
index 285e6e96af5..26e06e77be4 100644
--- a/gcc/lto-wrapper.cc
+++ b/gcc/lto-wrapper.cc
@@ -1428,7 +1428,6 @@ run_gcc (unsigned argc, char *argv[])
   char **lto_argv, **ltoobj_argv;
   bool linker_output_rel = false;
   bool skip_debug = false;
-  unsigned n_debugobj;
   const char *incoming_dumppfx = dumppfx = NULL;
   static char current_dir[] = { '.', DIR_SEPARATOR, '\0' };
 
@@ -1871,7 +1870,6 @@ cont1:
 
   /* Copy the early generated debug info from the objects to temporary
      files and append those to the partial link commandline.  */
-  n_debugobj = 0;
   early_debug_object_names = NULL;
   if (! skip_debug)
     {
@@ -1881,10 +1879,7 @@ cont1:
 	{
 	  const char *tem;
 	  if ((tem = debug_objcopy (ltoobj_argv[i], !linker_output_rel)))
-	    {
-	      early_debug_object_names[i] = tem;
-	      n_debugobj++;
-	    }
+	    early_debug_object_names[i] = tem;
 	}
     }
 
diff --git a/gcc/tree-switch-conversion.cc b/gcc/tree-switch-conversion.cc
index e14b4e6c94a..50a17927f39 100644
--- a/gcc/tree-switch-conversion.cc
+++ b/gcc/tree-switch-conversion.cc
@@ -2039,18 +2039,14 @@ switch_decision_tree::balance_case_nodes (case_tree_node **head,
   if (np)
     {
       int i = 0;
-      int ranges = 0;
       case_tree_node **npp;
       case_tree_node *left;
       profile_probability prob = profile_probability::never ();
 
-      /* Count the number of entries on branch.  Also count the ranges.  */
+      /* Count the number of entries on branch.  */
 
       while (np)
 	{
-	  if (!tree_int_cst_equal (np->m_c->get_low (), np->m_c->get_high ()))
-	    ranges++;
-
 	  i++;
 	  prob += np->m_c->m_prob;
 	  np = np->m_right;
@@ -2063,8 +2059,8 @@ switch_decision_tree::balance_case_nodes (case_tree_node **head,
 	  left = *npp;
 	  profile_probability pivot_prob = prob.apply_scale (1, 2);
 
-	  /* Find the place in the list that bisects the list's total cost,
-	     where ranges count as 2.  */
+	  /* Find the place in the list that bisects the list's total cost
+	     by probability.  */
 	  while (1)
 	    {
 	      /* Skip nodes while their probability does not reach