Add missing single_pred_p test in scop_detection::merge_sese

2016-03-16  Tom de Vries  <tom@codesourcery.com>

	PR tree-optimization/68715
	* graphite-scop-detection.c (scop_detection::merge_sese): Add missing
	single_pred_p test.

	* gcc.dg/graphite/pr68715-2.c: New test.
	* gcc.dg/graphite/pr68715.c: New test.
	* gfortran.dg/graphite/pr68715.f90: New test.

From-SVN: r234251

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2016-03-16  Tom de Vries  <tom@codesourcery.com>
+
+	PR tree-optimization/68715
+	* graphite-scop-detection.c (scop_detection::merge_sese): Add missing
+	single_pred_p test.
+
 2016-03-16  Tom de Vries  <tom@codesourcery.com>
 
 	PR tree-optimization/68809

gcc/graphite-scop-detection.c

@@ -836,7 +836,9 @@ scop_detection::merge_sese (sese_l first, sese_l second) const
     {
       /* Find the first empty succ (with single exit) of combined.exit.  */
       basic_block imm_succ = combined.exit->dest;
-      if (single_succ_p (imm_succ) && trivially_empty_bb_p (imm_succ))
+      if (single_succ_p (imm_succ)
+	  && single_pred_p (imm_succ)
+	  && trivially_empty_bb_p (imm_succ))
 	combined.exit = single_succ_edge (imm_succ);
       else
 	{

gcc/testsuite/ChangeLog

@@ -1,3 +1,10 @@
+2016-03-16  Tom de Vries  <tom@codesourcery.com>
+
+	PR tree-optimization/68715
+	* gcc.dg/graphite/pr68715-2.c: New test.
+	* gcc.dg/graphite/pr68715.c: New test.
+	* gfortran.dg/graphite/pr68715.f90: New test.
+
 2016-03-16  Tom de Vries  <tom@codesourcery.com>
 
 	PR tree-optimization/68809

gcc/testsuite/gcc.dg/graphite/pr68715-2.c

@@ -0,0 +1,35 @@
+/* { dg-do compile } */
+/* { dg-options "-Ofast -floop-interchange" } */
+
+int a, b, c, d, f, g;
+int e[1], h[1];
+void fn2 ();
+void fn3 ();
+void
+fn1 ()
+{
+  fn2 ();
+  b = 0;
+  for (; b < 10; b++)
+    ;
+}
+
+void
+fn2 ()
+{
+  if (a)
+    {
+      fn3 ();
+      c = d;
+    }
+}
+
+void
+fn3 ()
+{
+  for (; g; g++)
+    e[g] = 2;
+  if (f)
+    for (; g; g++)
+      h[g] = 5;
+}

gcc/testsuite/gcc.dg/graphite/pr68715.c

@@ -0,0 +1,36 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -floop-interchange" } */
+
+int a[1], c[1];
+int b, d, e;
+
+void
+fn1 (int p1)
+{
+  for (;;)
+    ;
+}
+
+int
+fn3 ()
+{
+  for (; e; e++)
+    c[e] = 2;
+  for (; d; d--)
+    a[d] = 8;
+  return 0;
+}
+
+int fn5 (int);
+
+int
+fn2 ()
+{
+  fn3 ();
+}
+
+void
+fn4 ()
+{
+  fn1 (b || fn5 (fn2 ()));
+}

gcc/testsuite/gfortran.dg/graphite/pr68715.f90

@@ -0,0 +1,31 @@
+! { dg-do compile }
+! { dg-options "-floop-nest-optimize -O1" }
+
+SUBROUTINE se_core_core_interaction(calculate_forces)
+  INTEGER, PARAMETER :: dp=8
+  LOGICAL, INTENT(in)		 :: calculate_forces
+  REAL(KIND=dp), DIMENSION(3)	 :: force_ab, rij
+  LOGICAL :: lfoo,kfoo,mfoo,nfoo,ffoo
+  INTEGER, PARAMETER :: mi2=42
+  CALL dummy(lfoo,kfoo,mfoo,nfoo,method_id,core_core)
+  IF (lfoo) THEN
+     DO WHILE (ffoo())
+	IF (lfoo) CYCLE
+	IF (kfoo) CYCLE
+	dr1 = DOT_PRODUCT(rij,rij)
+	IF (dr1 > rij_threshold) THEN
+	   SELECT CASE (method_id)
+	   CASE (mi2)
+	      IF (calculate_forces) THEN
+		 CALL dummy2(force_ab)
+		 IF (nfoo) THEN
+		    force_ab = force_ab + core_core*dr3inv
+		 END IF
+	      END IF
+	   END SELECT
+	END IF
+	enuclear = enuclear + enucij
+     END DO
+     CALL dummy3(enuclear)
+  END IF
+END SUBROUTINE se_core_core_interaction