Add PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION.

2010-03-09  Sebastian Pop  <sebastian.pop@amd.com>

	* graphite.c (graphite_initialize): To bound the number of bbs per
	function, use PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION.
	* params.def (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION): Declared.
	* doc/invoke.texi: Document it.

From-SVN: r157433

gcc/ChangeLog.graphite

 2010-03-09  Sebastian Pop  <sebastian.pop@amd.com>
 
+	* graphite.c (graphite_initialize): To bound the number of bbs per
+	function, use PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION.
+	* params.def (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION): Declared.
+	* doc/invoke.texi: Document it.
+
+2010-03-09  Sebastian Pop  <sebastian.pop@amd.com>
+
 	* graphite-sese-to-poly.c (build_poly_scop): Do not return bool.
 	* graphite-sese-to-poly.h (build_poly_scop): Same.
 

gcc/doc/invoke.texi

@@ -8496,6 +8496,11 @@ pointer parameter.
 To avoid exponential effects in the Graphite loop transforms, the
 number of parameters in a SCoP is bounded by 10.
 
+@item graphite-max-bbs-per-function
+To avoid exponential effects in the detection of SCoPs, the functions
+with more than 100 basic blocks are not handled by the Graphite loop
+transforms.
+
 @end table
 @end table
 

gcc/graphite.c

@@ -202,7 +202,7 @@ graphite_initialize (void)
   if (number_of_loops () <= 1
       /* FIXME: This limit on the number of basic blocks of a function
 	 should be removed when the SCOP detection is faster.  */
-      || n_basic_blocks > 100)
+      || n_basic_blocks > PARAM_VALUE (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION))
     {
       if (dump_file && (dump_flags & TDF_DETAILS))
 	print_global_statistics (dump_file);

gcc/params.def

@@ -752,6 +752,13 @@ DEFPARAM (PARAM_GRAPHITE_MAX_NB_SCOP_PARAMS,
 	  "maximal number of parameters in a SCoP",
 	  10, 0, 0)
 
+/* Maximal number of basic blocks in the functions analyzed by Graphite.  */
+
+DEFPARAM (PARAM_GRAPHITE_MAX_BBS_PER_FUNCTION,
+	  "graphite-max-bbs-per-function",
+	  "maximal number of basic blocks per function to be analyzed by Graphite",
+	  100, 0, 0)
+
 /* Avoid doing loop invariant motion on very large loops.  */
 
 DEFPARAM (PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP,