[RFC] Add OPTGROUP_PAR

[Tom de Vries <Tom_deVries at mentor dot com>]

Hi,

this patch adds OPTGROUP_PAR.

It allows a user to see on stderr what loops are parallelized by 
pass_parallelize_loops, using -fopt-info-par:
...
$ gcc -O2 -fopt-info-par test.c -ftree-parallelize-loops=32
test.c:5:3: note: parallelized inner loop
...

This patch doesn't include any MSG_MISSED_OPTIMIZATION/MSG_NOTE messages 
yet.

Idea of the patch OK?

Any other comments?

Thanks,
- Tom

Add OPTGROUP_PAR

2015-10-19  Tom de Vries  <tom@codesourcery.com>

	* doc/invoke.texi (@item -fopt-info): Add @item par in group of
	optimizations table.
	* dumpfile.c (optgroup_options): Add OPTGROUP_PAR entry.
	* dumpfile.h (OPTGROUP_PAR): New define.
	(OPTGROUP_OTHER): Renumber.
	(OPTGROUP_ALL): Add OPTGROUP_PAR.
	* tree-parloops.c (parallelize_loops): Handle -fopt-info-par.
	(pass_data_parallelize_loops): Change optinfo_flags from OPTGROUP_LOOP
	to OPTGROUP_PAR.
---
 gcc/doc/invoke.texi |  2 ++
 gcc/dumpfile.c      |  1 +
 gcc/dumpfile.h      |  5 +++--
 gcc/tree-parloops.c | 16 ++++++++++------
 4 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 54e9f12..629ee37 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -7319,6 +7319,8 @@ Enable dumps from all loop optimizations.
 Enable dumps from all inlining optimizations.
 @item vec
 Enable dumps from all vectorization optimizations.
+@item par
+Enable dumps from all auto-parallelization optimizations.
 @item optall
 Enable dumps from all optimizations. This is a superset of
 the optimization groups listed above.
diff --git a/gcc/dumpfile.c b/gcc/dumpfile.c
index e4c4748..421d19b 100644
--- a/gcc/dumpfile.c
+++ b/gcc/dumpfile.c
@@ -138,6 +138,7 @@ static const struct dump_option_value_info optgroup_options[] =
   {"loop", OPTGROUP_LOOP},
   {"inline", OPTGROUP_INLINE},
   {"vec", OPTGROUP_VEC},
+  {"par", OPTGROUP_PAR},
   {"optall", OPTGROUP_ALL},
   {NULL, 0}
 };
diff --git a/gcc/dumpfile.h b/gcc/dumpfile.h
index 5f30077..52371f4 100644
--- a/gcc/dumpfile.h
+++ b/gcc/dumpfile.h
@@ -97,9 +97,10 @@ enum tree_dump_index
 #define OPTGROUP_LOOP        (1 << 2)   /* Loop optimization passes */
 #define OPTGROUP_INLINE      (1 << 3)   /* Inlining passes */
 #define OPTGROUP_VEC         (1 << 4)   /* Vectorization passes */
-#define OPTGROUP_OTHER       (1 << 5)   /* All other passes */
+#define OPTGROUP_PAR	     (1 << 5)   /* Auto-parallelization passes */
+#define OPTGROUP_OTHER       (1 << 6)   /* All other passes */
 #define OPTGROUP_ALL	     (OPTGROUP_IPA | OPTGROUP_LOOP | OPTGROUP_INLINE \
-                              | OPTGROUP_VEC | OPTGROUP_OTHER)
+			      | OPTGROUP_VEC | OPTGROUP_PAR | OPTGROUP_OTHER)
 
 /* Define a tree dump switch.  */
 struct dump_file_info
diff --git a/gcc/tree-parloops.c b/gcc/tree-parloops.c
index c7aa62c..e98c2c7 100644
--- a/gcc/tree-parloops.c
+++ b/gcc/tree-parloops.c
@@ -2718,17 +2718,21 @@ parallelize_loops (void)
 
       changed = true;
       skip_loop = loop->inner;
+      const char *loop_describe = (loop->inner
+				   ? "outer"
+				   : "inner");
+      loop_loc = find_loop_location (loop);
       if (dump_file && (dump_flags & TDF_DETAILS))
       {
-	if (loop->inner)
-	  fprintf (dump_file, "parallelizing outer loop %d\n",loop->header->index);
-	else
-	  fprintf (dump_file, "parallelizing inner loop %d\n",loop->header->index);
-	loop_loc = find_loop_location (loop);
+	fprintf (dump_file, "parallelizing %s loop %d\n", loop_describe,
+		 loop->header->index);
 	if (loop_loc != UNKNOWN_LOCATION)
 	  fprintf (dump_file, "\nloop at %s:%d: ",
 		   LOCATION_FILE (loop_loc), LOCATION_LINE (loop_loc));
       }
+      if (dump_enabled_p ())
+	dump_printf_loc (MSG_OPTIMIZED_LOCATIONS, loop_loc,
+			 "parallelized %s loop\n", loop_describe);
       gen_parallel_loop (loop, &reduction_list,
 			 n_threads, &niter_desc);
     }
@@ -2752,7 +2756,7 @@ const pass_data pass_data_parallelize_loops =
 {
   GIMPLE_PASS, /* type */
   "parloops", /* name */
-  OPTGROUP_LOOP, /* optinfo_flags */
+  OPTGROUP_PAR, /* optinfo_flags */
   TV_TREE_PARALLELIZE_LOOPS, /* tv_id */
   ( PROP_cfg | PROP_ssa ), /* properties_required */
   0, /* properties_provided */
-- 
1.9.1