re PR target/83986 (ICE in maybe_record_trace_start, at dwarf2cfi.c:2348)

	PR rtl-optimization/83986
	* sched-deps.c (sched_analyze_insn): For frame related insns, add anti
	dependence against last_pending_memory_flush in addition to
	pending_jump_insns.

	* gcc.dg/pr83986.c: New test.

From-SVN: r257203

gcc/ChangeLog

+2018-01-30  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/83986
+	* sched-deps.c (sched_analyze_insn): For frame related insns, add anti
+	dependence against last_pending_memory_flush in addition to
+	pending_jump_insns.
+
 2018-01-30  Alexandre Oliva <aoliva@redhat.com>
 
 	PR tree-optimization/81611

gcc/sched-deps.c

@@ -2922,6 +2922,8 @@ sched_analyze_insn (struct deps_desc *deps, rtx x, rtx_insn *insn)
 	= alloc_INSN_LIST (insn, deps->sched_before_next_jump);
 
       /* Make sure epilogue insn is scheduled after preceding jumps.  */
+      add_dependence_list (insn, deps->last_pending_memory_flush, 1,
+			   REG_DEP_ANTI, true);
       add_dependence_list (insn, deps->pending_jump_insns, 1, REG_DEP_ANTI,
 			   true);
     }

gcc/testsuite/ChangeLog

+2018-01-30  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/83986
+	* gcc.dg/pr83986.c: New test.
+
 2018-01-30  Bill Seurer  <seurer@linux.vnet.ibm.com>
 
 	PR 58684

gcc/testsuite/gcc.dg/pr83986.c

+/* PR rtl-optimization/83986 */
+/* { dg-do compile } */
+/* { dg-options "-g -O2 -fsched2-use-superblocks -funwind-tables --param max-pending-list-length=1" } */
+
+int v;
+
+int
+foo (int x)
+{
+  v &= !!v && !!x;
+  if (v != 0)
+    foo (0);
+  return 0;
+}