re PR debug/64817 (compilation hangs at -O3 with -g enabled on x86_64-linux-gnu)

	PR debug/64817
	* cfgexpand.c (deep_ter_debug_map): New variable.
	(avoid_deep_ter_for_debug): New function.
	(expand_debug_expr): If TERed SSA_NAME is in
	deep_ter_debug_map, use the corresponding DEBUG_EXPR_DECL
	instead of trying to expand SSA_NAME's def stmt.
	(expand_debug_locations): When expanding debug bind
	of a DEBUG_EXPR_DECL to corresponding SSA_NAME,
	temporarily remove the DEBUG_EXPR_DECL from deep_ter_debug_map's
	value.
	(pass_expand::execute): Call avoid_deep_ter_for_debug on
	all debug bind stmts.  Delete deep_ter_debug_map after
	expand_debug_location if non-NULL and clear it.

	* gcc.dg/pr64817-1.c: New test.
	* gcc.dg/pr64817-2.c: New test.

From-SVN: r220320

1 files changed, 20 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/pr64817-1.c b/gcc/testsuite/gcc.dg/pr64817-1.c
new file mode 100644
index 0000000..9d016da
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr64817-1.c
@@ -0,0 +1,20 @@
+/* PR debug/64817 */
+/* { dg-do compile } */
+/* { dg-options "-O3 -g" } */
+
+int a, b, d;
+
+void
+foo (void)
+{
+  for (b = 0; b < 9; b++)
+    {
+      int e;
+      for (d = 0; d < 5; d++)
+	{
+	  a &= 231;
+	  a ^= 14;
+	}
+      e = (a ^= 1) < 0;
+    }
+}