[PATCH][GRAPHITE] Make --param loop-block-tile-size=0 disable tiling

[Richard Biener]

Currently ISL aborts on this special value and for debugging (and 
tuning?) it's nice to avoid all the clutter introduced by tiling.

Committed as obvious.

Richard.

2017-09-27  Richard Biener  <rguent...@suse.de>

        * graphite-optimize-isl.c (get_schedule_for_node_st): Allow
        --param loop-block-tile-size=0 to disable tiling.

Index: gcc/graphite-optimize-isl.c
===================================================================
--- gcc/graphite-optimize-isl.c (revision 253226)
+++ gcc/graphite-optimize-isl.c (working copy)
@@ -64,7 +64,10 @@ get_schedule_for_node_st (__isl_take isl
   if (type != isl_schedule_node_leaf)
     return node;
 
-  if (dims <= 1 || !isl_schedule_node_band_get_permutable (node))
+  long tile_size = PARAM_VALUE (PARAM_LOOP_BLOCK_TILE_SIZE);
+  if (dims <= 1
+      || tile_size == 0
+      || !isl_schedule_node_band_get_permutable (node))
     {
       if (dump_file && dump_flags)
        fprintf (dump_file, "not tiled\n");
@@ -74,7 +77,6 @@ get_schedule_for_node_st (__isl_take isl
   /* Tile loops.  */
   space = isl_schedule_node_band_get_space (node);
   isl_multi_val *sizes = isl_multi_val_zero (space);
-  long tile_size = PARAM_VALUE (PARAM_LOOP_BLOCK_TILE_SIZE);
   isl_ctx *ctx = isl_schedule_node_get_ctx (node);
 
   for (unsigned i = 0; i < dims; i++)