sched-rgn: run add_branch_dependencies for sel-sched (PR 84301)

	PR target/84301
	* sched-rgn.c (add_branch_dependences): Move sel_sched_p check here...
	(compute_block_dependences): ... from here.

testsuite/
	* gcc.target/i386/pr84301.c: New test.

From-SVN: r259321

gcc/ChangeLog

+2018-04-11  Alexander Monakov  <amonakov@ispras.ru>
+
+	PR target/84301
+	* sched-rgn.c (add_branch_dependences): Move sel_sched_p check here...
+	(compute_block_dependences): ... from here.
+
 2018-04-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/85331

gcc/sched-rgn.c

@@ -2497,6 +2497,11 @@ add_branch_dependences (rtx_insn *head, rtx_insn *tail)
       while (insn != head && DEBUG_INSN_P (insn));
     }
 
+  /* Selective scheduling handles control dependencies by itself, and
+     CANT_MOVE flags ensure that other insns will be kept in place.  */
+  if (sel_sched_p ())
+    return;
+
   /* Make sure these insns are scheduled last in their block.  */
   insn = last;
   if (insn != 0)
@@ -2725,9 +2730,7 @@ compute_block_dependences (int bb)
 
   sched_analyze (&tmp_deps, head, tail);
 
-  /* Selective scheduling handles control dependencies by itself.  */
-  if (!sel_sched_p ())
-    add_branch_dependences (head, tail);
+  add_branch_dependences (head, tail);
 
   if (current_nr_blocks > 1)
     propagate_deps (bb, &tmp_deps);

gcc/testsuite/ChangeLog

+2018-04-11  Alexander Monakov  <amonakov@ispras.ru>
+
+	PR target/84301
+	* gcc.target/i386/pr84301.c: New test.
+
 2018-04-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/85331

gcc/testsuite/gcc.target/i386/pr84301.c

+/* PR target/84301 */
+/* { dg-do compile } */
+/* { dg-options "-march=bdver1 -O1 -fexpensive-optimizations -fschedule-insns -fselective-scheduling -fno-dce -fno-tree-dce --param max-pending-list-length=0 --param selsched-max-lookahead=2" } */
+
+int lr;
+long int xl;
+
+int
+v4 (void)
+{
+  int mp;
+
+  ++xl;
+  mp = (lr - xl) > 1;
+}