enable loop fusion on isl-15

       * graphite-optimize-isl.c (optimize_isl): Call
       isl_options_set_schedule_maximize_band_depth.

       * gcc.dg/graphite/fuse-1.c: New.
       * gcc.dg/graphite/fuse-2.c: New.
       * gcc.dg/graphite/interchange-13.c: Remove bogus check.

Co-Authored-By: Sebastian Pop <s.pop@samsung.com>

From-SVN: r229889

gcc/ChangeLog

 2015-11-06  Aditya Kumar  <aditya.k7@samsung.com>
 	    Sebastian Pop  <s.pop@samsung.com>
 
-        * graphite-scop-detection.c (scop_detection::merge_sese): Entry
+	* graphite-optimize-isl.c (optimize_isl): Call
+	isl_options_set_schedule_maximize_band_depth.
+
+2015-11-06  Aditya Kumar  <aditya.k7@samsung.com>
+	    Sebastian Pop  <s.pop@samsung.com>
+
+	* graphite-scop-detection.c (scop_detection::merge_sese): Entry
 	and exit edges should not be a part of irreducible loop.
-        (scop_detection::can_represent_loop_1): Loops should not be
+	(scop_detection::can_represent_loop_1): Loops should not be
 	irreducible.
-        (scop_detection::harmful_stmt_in_region): All the basic block
+	(scop_detection::harmful_stmt_in_region): All the basic block
 	should belong to reducible loops.
 
 2015-11-06  Christophe Lyon  <christophe.lyon@linaro.org>

gcc/graphite-optimize-isl.c

@@ -404,7 +404,7 @@ optimize_isl (scop_p scop)
   isl_options_set_schedule_maximize_band_depth (scop->isl_context, 1);
 #ifdef HAVE_ISL_OPTIONS_SET_SCHEDULE_SERIALIZE_SCCS
   /* ISL-0.15 or later.  */
-  isl_options_set_schedule_serialize_sccs (scop->isl_context, 1);
+  isl_options_set_schedule_maximize_band_depth (scop->isl_context, 1);
 #else
   isl_options_set_schedule_fuse (scop->isl_context, ISL_SCHEDULE_FUSE_MIN);
 #endif

gcc/testsuite/ChangeLog

+2015-11-06  Aditya Kumar  <aditya.k7@samsung.com>
+	    Sebastian Pop  <s.pop@samsung.com>
+
+	* gcc.dg/graphite/fuse-1.c: New.
+	* gcc.dg/graphite/fuse-2.c: New.
+	* gcc.dg/graphite/interchange-13.c: Remove bogus check.
+
 2015-11-06  Christophe Lyon  <christophe.lyon@linaro.org>
 
 	* gcc.target/aarch64/advsimd-intrinsics/vqtbX.c: New test.

gcc/testsuite/gcc.dg/graphite/fuse-1.c

+/* Check that the two loops are fused and that we manage to fold the two xor
+   operations.  */
+/* { dg-options "-O2 -floop-nest-optimize -fdump-tree-forwprop-all" } */
+/* { dg-do run } */
+
+/* Make sure we fuse the loops like this:
+ISL AST generated by ISL:
+for (int c0 = 0; c0 <= 99; c0 += 1) {
+  S_3(c0);
+  S_6(c0);
+  S_9(c0);
+}
+*/
+/* { dg-final { scan-tree-dump-times "ISL AST generated by ISL:.*for (int c0 = 0; c0 <= 99; c0 += 1) \{.*S_.*(c0);.*S_.*(c0);.*S_.*(c0);.*\}" 1 "graphite" } } */
+
+/* Check that after fusing the loops, the scalar computation is also fused.  */
+/* { dg-final { scan-tree-dump-times "gimple_simplified to\[^\\n\]*\\^ 12" 1 "forwprop4" } } */
+
+
+
+#define MAX 100
+int A[MAX];
+
+extern void abort ();
+
+int
+main (void)
+{
+  int i;
+
+  for (i = 0; i < MAX; i++)
+    A[i] = i;
+  for(int i=0; i<MAX; i++)
+    A[i] ^= 4;
+  for(int i=0; i<MAX; i++)
+    A[i] ^= 8;
+
+  for (i = 0; i < MAX; i++)
+    if (A[i] != (i ^ 12))
+      abort ();
+
+  return 0;
+}

gcc/testsuite/gcc.dg/graphite/fuse-2.c

+/* Check that the three loops are fused.  */
+/* { dg-options "-O2 -floop-nest-optimize" } */
+/* { dg-do run } */
+
+/* Make sure we fuse the loops like this:
+ISL AST generated by ISL:
+for (int c0 = 0; c0 <= 99; c0 += 1) {
+  S_3(c0);
+  S_6(c0);
+  S_9(c0);
+}
+*/
+
+/* { dg-final { scan-tree-dump-times "ISL AST generated by ISL:.*for (int c0 = 0; c0 <= 99; c0 += 1) \{.*S_.*(c0);.*S_.*(c0);.*S_.*(c0);.*\}" 1 "graphite" } } */
+
+#define MAX 100
+int A[MAX], B[MAX], C[MAX];
+
+extern void abort ();
+
+int
+main (void)
+{
+  int i;
+
+  /* The next three loops should be fused.  */
+  for (i = 0; i < MAX; i++)
+    {
+      A[i] = i;
+      B[i] = i + 2;
+      C[i] = i + 1;
+    }
+  for(int i=0; i<MAX; i++)
+    A[i] += B[i];
+  for(int i=0; i<MAX; i++)
+    A[i] += C[i];
+
+  for (i = 0; i < MAX; i++)
+    if (A[i] != 3*i+3)
+      abort ();
+
+  return 0;
+}

gcc/testsuite/gcc.dg/graphite/interchange-13.c

@@ -49,4 +49,3 @@ main (void)
   return 0;
 }
 
-/* { dg-final { scan-tree-dump "tiled" "graphite" } } */