re PR rtl-optimization/85423 (ICE in code_motion_process_successors, at sel-sched.c:6403)

        PR rtl-optimization/85423

        * sel-sched-ir.c (has_dependence_note_mem_dep): Only discard
        dependencies to debug insns when the previous insn is non-debug.

        * gcc.dg/pr85423.c: New test.

From-SVN: r259563

gcc/ChangeLog

+2018-04-23  Andrey Belevantsev  <abel@ispras.ru>
+
+        PR rtl-optimization/85423
+
+        * sel-sched-ir.c (has_dependence_note_mem_dep): Only discard
+        dependencies to debug insns when the previous insn is non-debug.
+
 2018-04-23  Claudiu Zissulescu  <claziss@synopsys.com>
 
 	* config/arc/arc.md ("vunspec"): Delete it, unify all the unspec

gcc/sel-sched-ir.c

@@ -3308,7 +3308,7 @@ has_dependence_note_dep (insn_t pro, ds_t ds ATTRIBUTE_UNUSED)
      that a bookkeeping copy should be movable as the original insn.
      Detect that here and allow that movement if we allowed it before
      in the first place.  */
-  if (DEBUG_INSN_P (real_con)
+  if (DEBUG_INSN_P (real_con) && !DEBUG_INSN_P (real_pro)
       && INSN_UID (NEXT_INSN (pro)) == INSN_UID (real_con))
     return;
 

gcc/testsuite/ChangeLog

+2018-04-23  Andrey Belevantsev  <abel@ispras.ru>
+
+        PR rtl-optimization/85423
+        * gcc.dg/pr85423.c: New test.
+
 2018-04-20  Martin Sebor  <msebor@redhat.com>
 
 	PR c/85365

gcc/testsuite/gcc.dg/pr85423.c

+/* { dg-do compile { target powerpc*-*-* ia64-*-* i?86-*-* x86_64-*-* } } */
+/* { dg-options "-O2 -fselective-scheduling2 -fvar-tracking-assignments -fno-guess-branch-probability -fno-peephole2 -fno-ssa-phiopt -fno-tree-pre --param max-jump-thread-duplication-stmts=8 -w" } */
+/* { dg-additional-options "-march=nano" { target i?86-*-* x86_64-*-* } } */
+
+int vn, xm;
+
+void
+i1 (int);
+
+void
+mb (int *ap, int ev)
+{
+  while (vn < 1)
+    {
+      i1 (vn);
+
+      ev += *ap && ++vn;
+
+      while (xm < 1)
+        ++xm;
+
+      if (*ap == 0)
+        *ap = ev;
+
+      ++vn;
+    }
+}