[gcc(refs/users/marxin/heads/loop-unswitching-switch-v3)] Fix statement updating.

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

https://gcc.gnu.org/g:1befd7e2e6d15192583b9f655ca88e53337a6fc0

commit 1befd7e2e6d15192583b9f655ca88e53337a6fc0
Author: Martin Liska <mliska@suse.cz>
Date:   Mon Sep 13 17:22:26 2021 +0200

    Fix statement updating.

Diff:
---
 gcc/tree-ssa-loop-unswitch.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/gcc/tree-ssa-loop-unswitch.c b/gcc/tree-ssa-loop-unswitch.c
index 0568c283c41..de8df78ca69 100644
--- a/gcc/tree-ssa-loop-unswitch.c
+++ b/gcc/tree-ssa-loop-unswitch.c
@@ -397,6 +397,7 @@ tree_unswitch_single_loop (class loop *loop, int num)
 		{
 		  gimple_cond_set_condition_from_tree (condition,
 						       boolean_false_node);
+		  update_stmt (condition);
 		  changed = true;
 		}
 	      else if(ranger.range_on_edge (r, edge_false, gimple_cond_lhs (stmt))
@@ -404,6 +405,7 @@ tree_unswitch_single_loop (class loop *loop, int num)
 		{
 		  gimple_cond_set_condition_from_tree (condition,
 						       boolean_true_node);
+		  update_stmt (condition);
 		  changed = true;
 		}
 	    }
@@ -433,14 +435,14 @@ tree_unswitch_single_loop (class loop *loop, int num)
 
 	  if (index_candidate != NULL_TREE
 	      && ignored_edges.elements () == EDGE_COUNT (bbs[i]->succs) - 1)
-	    gimple_switch_set_index (swtch, index_candidate);
+	    {
+	      gimple_switch_set_index (swtch, index_candidate);
+	      update_stmt (swtch);
+	    }
 	}
 
-      /* gswitch can return NULL_TREE for cases that are not supported.  */
-      if (cond == NULL_TREE)
-	;
       /* Do not unswitch too much.  */
-      else if (num > param_max_unswitch_level)
+      if (num > param_max_unswitch_level)
 	{
 	  i++;
 	  continue;
@@ -461,7 +463,6 @@ tree_unswitch_single_loop (class loop *loop, int num)
 	  break;
 	}
 
-      update_stmt (stmt);
       i++;
     }