Speed-up loop blocking: strip-mining is always legal.

2010-08-23  Sebastian Pop  <sebastian.pop@amd.com>

	* graphite-blocking.c (scop_do_strip_mine): Do not call
	graphite_legal_transform.
	(scop_do_block): Same.

From-SVN: r164793

gcc/ChangeLog

+2010-09-30  Sebastian Pop  <sebastian.pop@amd.com>
+
+	* graphite-blocking.c (scop_do_strip_mine): Do not call
+	graphite_legal_transform.
+	(scop_do_block): Same.
+
 2010-09-30  Vladimir Kargov  <kargov@gmail.com>
 
 	* graphite-scop-detection.c (graphite_can_represent_loop): Correct the

gcc/ChangeLog.graphite

+2010-08-23  Sebastian Pop  <sebastian.pop@amd.com>
+
+	* graphite-blocking.c (scop_do_strip_mine): Do not call
+	graphite_legal_transform.
+	(scop_do_block): Same.
+
 2010-08-20  Vladimir Kargov  <kargov@gmail.com>
 
 	* graphite-scop-detection.c (graphite_can_represent_loop): Correct the

gcc/graphite-blocking.c

@@ -254,28 +254,13 @@ lst_do_strip_mine (lst_p lst)
   return res;
 }
 
-/* Strip mines all the loops in SCOP.  Nothing profitable in all this:
-   this is just a driver function.  */
+/* Strip mines all the loops in SCOP.  Returns true when some loops
+   have been strip-mined.  */
 
 bool
 scop_do_strip_mine (scop_p scop)
 {
-  bool transform_done = false;
-
-  store_scattering (scop);
-
-  transform_done = lst_do_strip_mine (SCOP_TRANSFORMED_SCHEDULE (scop));
-
-  if (!transform_done)
-    return false;
-
-  if (!graphite_legal_transform (scop))
-    {
-      restore_scattering (scop);
-      return false;
-    }
-
-  return transform_done;
+  return lst_do_strip_mine (SCOP_TRANSFORMED_SCHEDULE (scop));
 }
 
 /* Loop blocks all the loops in SCOP.  Returns true when we manage to
@@ -292,10 +277,10 @@ scop_do_block (scop_p scop)
   strip_mined = lst_do_strip_mine (SCOP_TRANSFORMED_SCHEDULE (scop));
   interchanged = scop_do_interchange (scop);
 
-  /* If we don't interchange loops, then the strip mine is not
-     profitable, and the transform is not a loop blocking.  */
-  if (!interchanged
-      || !graphite_legal_transform (scop))
+  /* If we don't interchange loops, the strip mine alone will not be
+     profitable, and the transform is not a loop blocking: so revert
+     the transform.  */
+  if (!interchanged)
     {
       restore_scattering (scop);
       return false;