Handle -fno-guess-branch-probability properly in predict.c (PR ipa/84825).

2018-03-20  Martin Liska  <mliska@suse.cz>

	PR ipa/84825
	* predict.c (rebuild_frequencies): Handle case when we have
	PROFILE_ABSENT, but flag_guess_branch_prob is false.
2018-03-20  Martin Liska  <mliska@suse.cz>

	PR ipa/84825
	* g++.dg/ipa/pr84825.C: New test.

From-SVN: r258683

gcc/ChangeLog

+2018-03-20  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/84825
+	* predict.c (rebuild_frequencies): Handle case when we have
+	PROFILE_ABSENT, but flag_guess_branch_prob is false.
+
 2018-03-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/84990

gcc/predict.c

@@ -3998,6 +3998,9 @@ rebuild_frequencies (void)
     }
   else if (profile_status_for_fn (cfun) == PROFILE_READ)
     update_max_bb_count ();
+  else if (profile_status_for_fn (cfun) == PROFILE_ABSENT
+	   && !flag_guess_branch_prob)
+    ;
   else
     gcc_unreachable ();
   timevar_pop (TV_REBUILD_FREQUENCIES);

gcc/testsuite/ChangeLog

 2018-03-20  Martin Liska  <mliska@suse.cz>
 
+	PR ipa/84825
+	* g++.dg/ipa/pr84825.C: New test.
+
+2018-03-20  Martin Liska  <mliska@suse.cz>
+
 	* gcc.dg/lto/chkp-ctor-merge_0.c: Remove.
 
 2018-03-20  Jakub Jelinek  <jakub@redhat.com>

gcc/testsuite/g++.dg/ipa/pr84825.C

+/* PR ipa/84658 */
+/* { dg-options "-O3 --param early-inlining-insns=0 -fno-guess-branch-probability" } */
+
+struct a;
+struct b;
+struct c {
+  virtual a *d(b *);
+};
+struct a {
+  virtual a e();
+};
+struct f {
+  virtual ~f();
+};
+struct g : f, a {};
+struct b : c, virtual g {
+  b *d(b *h) { return h; }
+} i;