re PR tree-optimization/87360 (ICE in remove_redundant_iv_tests at…

re PR tree-optimization/87360 (ICE in remove_redundant_iv_tests at gcc/tree-ssa-loop-ivcanon.c:571 since r255467)

	PR tree-optimization/87360
	* gimple-loop-jam.c (tree_loop_unroll_and_jam): On failure to analyze
	data dependencies, don't return false, just continue.  Formatting
	fixes.
	(merge_loop_tree, bb_prevents_fusion_p, unroll_jam_possible_p,
	fuse_loops): Formatting fixes.

	* g++.dg/opt/pr87360.C: New test.
	* gfortran.dg/pr87360.f90: New test.

From-SVN: r266820

gcc/ChangeLog

 2018-12-05  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/87360
+	* gimple-loop-jam.c (tree_loop_unroll_and_jam): On failure to analyze
+	data dependencies, don't return false, just continue.  Formatting
+	fixes.
+	(merge_loop_tree, bb_prevents_fusion_p, unroll_jam_possible_p,
+	fuse_loops): Formatting fixes.
+
 	PR sanitizer/88333
 	* cfgexpand.c (expand_stack_vars): If asan_vec is empty, start with
 	aligning frame offset to ASAN_RED_ZONE_SIZE bytes.

gcc/gimple-loop-jam.c

@@ -455,7 +455,7 @@ tree_loop_unroll_and_jam (void)
 	    fprintf (dump_file, "Cannot analyze data dependencies\n");
 	  free_data_refs (datarefs);
 	  free_dependence_relations (dependences);
-	  return false;
+	  continue;
 	}
       if (!datarefs.length ())
 	continue;

gcc/testsuite/ChangeLog

 2018-12-05  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/87360
+	* g++.dg/opt/pr87360.C: New test.
+	* gfortran.dg/pr87360.f90: New test.
+
 	PR c++/87897
 	* g++.dg/init/const13.C: New test.
 

gcc/testsuite/g++.dg/opt/pr87360.C

+// PR tree-optimization/87360
+// { dg-do compile { target size32plus } }
+// { dg-options "-O3 -fno-tree-dce --param unroll-jam-min-percent=0" }
+
+void abort (void);
+
+void foo (int N)
+{
+  int i, j;
+  int x[1000][1000];
+
+  for (i = 0; i < N; i++)
+    for (j = 0; j < N; j++)
+      x[i][j] = i + j + 3;
+
+  for (i = 0; i < N; i++)
+    for (j = 0; j < N; j++)
+      if (x[i][j] != i + j + 3)
+	abort ();
+}
+
+int main(void)
+{
+  foo (1000);
+
+  return 0;
+}

gcc/testsuite/gfortran.dg/pr87360.f90

+! PR tree-optimization/87360
+! { dg-do compile }
+! { dg-options "-fno-tree-dce -O3 --param max-completely-peeled-insns=0" }
+
+include 'function_optimize_2.f90'