improfe loop dumps

we have flow_loop_dump and print_loop. While print_loop was extended to dump
stuff from loop structure we added over years (loop info), flow_loop_dump was not.
-fdump-tree-all files contains flow_loop_dump which makes it hard to see what
metadata we have attached to loop.

This patch unifies dumping of these fields from both functions.  For example for:
int a[100];
main()
{
        for (int i = 0;  i < 10; i++)
                a[i]=i;
}
we now print:
;; Loop 0
;;  header 0, latch 1
;;  depth 0, outer -1
;;  nodes: 0 1 2 3 4 5
;;
;; Loop 1
;;  header 4, latch 3
;;  depth 1, outer 0, finite_p
;;  upper_bound 10
;;  likely_upper_bound 10
;;  estimate 10
;;  iterations by profile: 10.001101 (unreliable)

finite_p, upper_boud, likely_upper_bound estimate and iterations by profile is new.

Bootstrap/regtest on x86_64 in progress. OK if it passes?

Honza

gcc/ChangeLog:

	* cfgloop.cc (flow_loop_dump): Use print_loop_info.
	* cfgloop.h (print_loop_info): Declare.
	* tree-cfg.cc (print_loop_info): Break out from ...; add
	printing of missing fields and profile
	(print_loop): ... here.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/dce-1.c: Update for new loop dumps.

gcc/cfgloop.cc

@@ -135,17 +135,12 @@ flow_loop_dump (const class loop *loop, FILE *file,
       fprintf (file, "\n");
     }
 
-  fprintf (file, ";;  depth %d, outer %ld\n",
+  fprintf (file, ";;  depth %d, outer %ld",
 	   loop_depth (loop), (long) (loop_outer (loop)
 				      ? loop_outer (loop)->num : -1));
+  print_loop_info (file, loop, ";;  ");
 
-  bool reliable;
-  sreal iterations;
-  if (loop->num && expected_loop_iterations_by_profile (loop, &iterations, &reliable))
-    fprintf (file, ";;  profile-based iteration count: %f %s\n",
-	     iterations.to_double (), reliable ? "(reliable)" : "(unreliable)");
-
-  fprintf (file, ";;  nodes:");
+  fprintf (file, "\n;;  nodes:");
   bbs = get_loop_body (loop);
   for (i = 0; i < loop->num_nodes; i++)
     fprintf (file, " %d", bbs[i]->index);

gcc/cfgloop.h

@@ -411,6 +411,7 @@ extern unsigned expected_loop_iterations (class loop *);
 extern rtx doloop_condition_get (rtx_insn *);
 
 void mark_loop_for_removal (loop_p);
+void print_loop_info (FILE *file, const class loop *loop, const char *);
 
 /* Induction variable analysis.  */
 

gcc/testsuite/gcc.dg/tree-ssa/dce-1.c

@@ -13,6 +13,6 @@ int foo (int b, int j)
 }
 /* Check that empty loop is eliminated in this case.  We should no longer have
    the exit condition after the loop.  */
-/* { dg-final { scan-tree-dump-not "999" "cddce1"} } */
-/* { dg-final { scan-tree-dump-not "1000" "cddce1"} } */
+/* { dg-final { scan-tree-dump-not "999)" "cddce1"} } */
+/* { dg-final { scan-tree-dump-not "1000)" "cddce1"} } */
 

gcc/tree-cfg.cc

@@ -8479,6 +8479,55 @@ print_loops_bb (FILE *file, basic_block bb, int indent, int verbosity)
     }
 }
 
+/* Print loop information.  */
+
+void
+print_loop_info (FILE *file, const class loop *loop, const char *prefix)
+{
+  if (loop->can_be_parallel)
+    fprintf (file, ", can_be_parallel");
+  if (loop->warned_aggressive_loop_optimizations)
+    fprintf (file, ", warned_aggressive_loop_optimizations");
+  if (loop->dont_vectorize)
+    fprintf (file, ", dont_vectorize");
+  if (loop->force_vectorize)
+    fprintf (file, ", force_vectorize");
+  if (loop->in_oacc_kernels_region)
+    fprintf (file, ", in_oacc_kernels_region");
+  if (loop->finite_p)
+    fprintf (file, ", finite_p");
+  if (loop->unroll)
+    fprintf (file, "\n%sunroll %d", prefix, loop->unroll);
+  if (loop->nb_iterations)
+    {
+      fprintf (file, "\n%sniter ", prefix);
+      print_generic_expr (file, loop->nb_iterations);
+    }
+
+  if (loop->any_upper_bound)
+    {
+      fprintf (file, "\n%supper_bound ", prefix);
+      print_decu (loop->nb_iterations_upper_bound, file);
+    }
+  if (loop->any_likely_upper_bound)
+    {
+      fprintf (file, "\n%slikely_upper_bound ", prefix);
+      print_decu (loop->nb_iterations_likely_upper_bound, file);
+    }
+
+  if (loop->any_estimate)
+    {
+      fprintf (file, "\n%sestimate ", prefix);
+      print_decu (loop->nb_iterations_estimate, file);
+    }
+  bool reliable;
+  sreal iterations;
+  if (loop->num && expected_loop_iterations_by_profile (loop, &iterations, &reliable))
+    fprintf (file, "\n%siterations by profile: %f %s", prefix,
+	     iterations.to_double (), reliable ? "(reliable)" : "(unreliable)");
+
+}
+
 static void print_loop_and_siblings (FILE *, class loop *, int, int);
 
 /* Pretty print LOOP on FILE, indented INDENT spaces.  Following
@@ -8511,27 +8560,7 @@ print_loop (FILE *file, class loop *loop, int indent, int verbosity)
     fprintf (file, ", latch = %d", loop->latch->index);
   else
     fprintf (file, ", multiple latches");
-  fprintf (file, ", niter = ");
-  print_generic_expr (file, loop->nb_iterations);
-
-  if (loop->any_upper_bound)
-    {
-      fprintf (file, ", upper_bound = ");
-      print_decu (loop->nb_iterations_upper_bound, file);
-    }
-  if (loop->any_likely_upper_bound)
-    {
-      fprintf (file, ", likely_upper_bound = ");
-      print_decu (loop->nb_iterations_likely_upper_bound, file);
-    }
-
-  if (loop->any_estimate)
-    {
-      fprintf (file, ", estimate = ");
-      print_decu (loop->nb_iterations_estimate, file);
-    }
-  if (loop->unroll)
-    fprintf (file, ", unroll = %d", loop->unroll);
+  print_loop_info (file, loop, s_indent);
   fprintf (file, ")\n");
 
   /* Print loop's body.  */