[PATCH 69/89] Make gimple_cond_set_{true|false}_label require gimple_cond.

[David Malcolm <dmalcolm at redhat dot com>]

gcc/
	* gimple.h (gimple_cond_set_true_label): Require a gimple_cond.
	(gimple_cond_set_false_label): Likewise.

	* tree-cfg.c (make_cond_expr_edges): Convert "entry" from gimple to
	a gimple_cond.
	(cleanup_dead_labels): Introduce a checked cast to a gimple_cond within
	the GIMPLE_COND case.
---
 gcc/gimple.h   |  6 ++----
 gcc/tree-cfg.c | 33 ++++++++++++++++++---------------
 2 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/gcc/gimple.h b/gcc/gimple.h
index 15e09db..395c432 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -3369,9 +3369,8 @@ gimple_cond_true_label (const_gimple gs)
    predicate evaluates to true.  */
 
 static inline void
-gimple_cond_set_true_label (gimple gs, tree label)
+gimple_cond_set_true_label (gimple_cond gs, tree label)
 {
-  GIMPLE_CHECK (gs, GIMPLE_COND);
   gimple_set_op (gs, 2, label);
 }
 
@@ -3380,9 +3379,8 @@ gimple_cond_set_true_label (gimple gs, tree label)
    predicate evaluates to false.  */
 
 static inline void
-gimple_cond_set_false_label (gimple gs, tree label)
+gimple_cond_set_false_label (gimple_cond gs, tree label)
 {
-  GIMPLE_CHECK (gs, GIMPLE_COND);
   gimple_set_op (gs, 3, label);
 }
 
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c
index caa11c1..68093de 100644
--- a/gcc/tree-cfg.c
+++ b/gcc/tree-cfg.c
@@ -999,7 +999,7 @@ assign_discriminators (void)
 static void
 make_cond_expr_edges (basic_block bb)
 {
-  gimple entry = last_stmt (bb);
+  gimple_cond entry = last_stmt (bb)->as_a_gimple_cond ();
   gimple then_stmt, else_stmt;
   basic_block then_bb, else_bb;
   tree then_label, else_label;
@@ -1370,21 +1370,24 @@ cleanup_dead_labels (void)
       switch (gimple_code (stmt))
 	{
 	case GIMPLE_COND:
-	  label = gimple_cond_true_label (stmt);
-	  if (label)
-	    {
-	      new_label = main_block_label (label);
-	      if (new_label != label)
-		gimple_cond_set_true_label (stmt, new_label);
-	    }
+	  {
+	    gimple_cond cond_stmt = stmt->as_a_gimple_cond ();
+	    label = gimple_cond_true_label (cond_stmt);
+	    if (label)
+	      {
+		new_label = main_block_label (label);
+		if (new_label != label)
+		  gimple_cond_set_true_label (cond_stmt, new_label);
+	      }
 
-	  label = gimple_cond_false_label (stmt);
-	  if (label)
-	    {
-	      new_label = main_block_label (label);
-	      if (new_label != label)
-		gimple_cond_set_false_label (stmt, new_label);
-	    }
+	    label = gimple_cond_false_label (cond_stmt);
+	    if (label)
+	      {
+		new_label = main_block_label (label);
+		if (new_label != label)
+		  gimple_cond_set_false_label (cond_stmt, new_label);
+	      }
+	  }
 	  break;
 
 	case GIMPLE_SWITCH:
-- 
1.8.5.3