re PR tree-optimization/56539 (ICE: verify_ssa failed: caused by -foptimize-sibling-calls)

	PR tree-optimization/56539
	* tree-tailcall.c (adjust_return_value_with_ops): Use GSI_SAME_STMT
	instead of GSI_CONTINUE_LINKING as last argument to
	force_gimple_operand_gsi.

	* gcc.c-torture/compile/pr56539.c: New test.

From-SVN: r196511

gcc/ChangeLog

 2013-03-06  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/56539
+	* tree-tailcall.c (adjust_return_value_with_ops): Use GSI_SAME_STMT
+	instead of GSI_CONTINUE_LINKING as last argument to
+	force_gimple_operand_gsi.  Adjust function comment.
+
 	* config/aarch64/t-aarch64 (TM_H, OPTIONS_H_EXTRA): Add
 	aarch64-cores.def.
 

gcc/testsuite/ChangeLog

+2013-03-06  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/56539
+	* gcc.c-torture/compile/pr56539.c: New test.
+
 2013-03-06  Kai Tietz  <ktietz@redhat.com>
 
 	* gcc.dg/lto/20090914-2_0.c: Skip for mingw and cygwin

gcc/testsuite/gcc.c-torture/compile/pr56539.c

+/* PR tree-optimization/56539 */
+
+short
+foo (const char *x, unsigned y)
+{
+  return y > 1 ? (x[y - 1] - '0') + 10 * foo (x, y - 1) : (*x - '0');
+}

gcc/tree-tailcall.c

@@ -599,8 +599,8 @@ add_successor_phi_arg (edge e, tree var, tree phi_arg)
 }
 
 /* Creates a GIMPLE statement which computes the operation specified by
-   CODE, OP0 and OP1 to a new variable with name LABEL and inserts the
-   statement in the position specified by GSI and UPDATE.  Returns the
+   CODE, ACC and OP1 to a new variable with name LABEL and inserts the
+   statement in the position specified by GSI.  Returns the
    tree node of the statement's result.  */
 
 static tree
@@ -622,7 +622,7 @@ adjust_return_value_with_ops (enum tree_code code, const char *label,
 					    fold_convert (TREE_TYPE (op1), acc),
 					    op1));
       rhs = force_gimple_operand_gsi (&gsi, rhs,
-				      false, NULL, true, GSI_CONTINUE_LINKING);
+				      false, NULL, true, GSI_SAME_STMT);
       stmt = gimple_build_assign (result, rhs);
     }