tree-ssa-copy.c (propagate_tree_value_into_stmt): Use update_call_from_tree when propagating into a call.

2012-04-20  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-copy.c (propagate_tree_value_into_stmt): Use
	update_call_from_tree when propagating into a call.

	* g++.dg/torture/20120420-1.C: New testcase.

From-SVN: r186622

gcc/ChangeLog

@@ -1,3 +1,8 @@
+2012-04-20  Richard Guenther  <rguenther@suse.de>
+
+	* tree-ssa-copy.c (propagate_tree_value_into_stmt): Use
+	update_call_from_tree when propagating into a call.
+
 2012-04-20  Alan Modra  <amodra@gmail.com>
 
 	* config/rs6000/rs6000.c (rs6000_emit_savres_rtx): Formatting.

gcc/testsuite/ChangeLog

@@ -1,3 +1,7 @@
+2012-04-20  Richard Guenther  <rguenther@suse.de>
+
+	* g++.dg/torture/20120420-1.C: New testcase.
+
 2012-04-19  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* gcc.target/i386/pr45830.c: Update scan-tree-dump.

gcc/testsuite/g++.dg/torture/20120420-1.C

@@ -0,0 +1,29 @@
+// { dg-do compile }
+
+int g, *gp[100];
+struct V {
+    int* x;
+    int y;
+};
+
+void foo (V **p, V* end, int i)
+{
+  *p = 0;
+  V* pp = *p;
+  int s = 100;
+  for (; pp < end; )
+    {
+      pp++;
+      (pp-1)->x = &g;
+      if (g)
+	{
+	  if (g>10)
+	    g++;
+	  int *t = (int*) operator new (100);
+	  (pp-1)->x = t;
+	}
+      else
+	s--;
+      gp[end-pp] = (pp-1)->x + s;
+    }
+}

gcc/tree-ssa-copy.c

@@ -257,13 +257,11 @@ propagate_tree_value_into_stmt (gimple_stmt_iterator *gsi, tree val)
   else if (is_gimple_call (stmt)
            && gimple_call_lhs (stmt) != NULL_TREE)
     {
-      gimple new_stmt;
-
       tree expr = NULL_TREE;
+      bool res;
       propagate_tree_value (&expr, val);
-      new_stmt = gimple_build_assign (gimple_call_lhs (stmt), expr);
+      res = update_call_from_tree (gsi, expr);
-      move_ssa_defining_stmt_for_defs (new_stmt, stmt);
+      gcc_assert (res);
-      gsi_replace (gsi, new_stmt, false);
     }
   else if (gimple_code (stmt) == GIMPLE_SWITCH)
     propagate_tree_value (gimple_switch_index_ptr (stmt), val);