re PR tree-optimization/82355 (ICE in outermost_loop_in_sese, at sese.c:301)

2017-10-02  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/82355
	* graphite-isl-ast-to-gimple.c (build_iv_mapping): Also build
	a mapping for the enclosing loop but avoid generating one for
	the loop tree root.
	(copy_bb_and_scalar_dependences): Remove premature codegen
	error on PHIs in blocks duplicated into multiple places.
	* graphite-scop-detection.c
	(scop_detection::stmt_has_simple_data_refs_p): For a loop not
	in the region use it as loop and nest to analyze the DR in.
	(try_generate_gimple_bb): Likewise.
	* graphite-sese-to-poly.c (extract_affine_chrec): Adjust.
	(add_loop_constraints): For blocks in a loop not in the region
	create a dimension with a single iteration.
	* sese.h (gbb_loop_at_index): Remove assert.

	* gcc.dg/graphite/fuse-1.c: Adjust.
	* gcc.dg/graphite/fuse-2.c: Likewise.
	* gcc.dg/graphite/pr82355.c: New testcase.

From-SVN: r253336

gcc/ChangeLog

@@ -1,3 +1,20 @@
+2017-10-02  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/82355
+	* graphite-isl-ast-to-gimple.c (build_iv_mapping): Also build
+	a mapping for the enclosing loop but avoid generating one for
+	the loop tree root.
+	(copy_bb_and_scalar_dependences): Remove premature codegen
+	error on PHIs in blocks duplicated into multiple places.
+	* graphite-scop-detection.c
+	(scop_detection::stmt_has_simple_data_refs_p): For a loop not
+	in the region use it as loop and nest to analyze the DR in.
+	(try_generate_gimple_bb): Likewise.
+	* graphite-sese-to-poly.c (extract_affine_chrec): Adjust.
+	(add_loop_constraints): For blocks in a loop not in the region
+	create a dimension with a single iteration.
+	* sese.h (gbb_loop_at_index): Remove assert.
+
 2017-10-01  Kevin Buettner  <kevinb@redhat.com>
 
 	* omp-expand.c (adjust_context_scope): New function.

gcc/graphite-isl-ast-to-gimple.c

@@ -774,8 +774,10 @@ build_iv_mapping (vec<tree> iv_map, gimple_poly_bb_p gbb,
       if (codegen_error_p ())
 	t = integer_zero_node;
 
-      loop_p old_loop = gbb_loop_at_index (gbb, region, i - 1);
+      loop_p old_loop = gbb_loop_at_index (gbb, region, i - 2);
-      iv_map[old_loop->num] = t;
+      /* Record sth only for real loops.  */
+      if (loop_in_sese_p (old_loop, region))
+	iv_map[old_loop->num] = t;
     }
 }
 
@@ -2587,18 +2589,6 @@ edge translate_isl_ast_to_gimple::
 copy_bb_and_scalar_dependences (basic_block bb, edge next_e, vec<tree> iv_map)
 {
   int num_phis = number_of_phi_nodes (bb);
-
-  if (region->copied_bb_map->get (bb))
-    {
-      /* FIXME: we should be able to handle phi nodes with args coming from
-	 outside the region.  */
-      if (num_phis)
-	{
-	  set_codegen_error ();
-	  return NULL;
-	}
-    }
-
   basic_block new_bb = NULL;
   if (bb_contains_loop_close_phi_nodes (bb))
     {

gcc/graphite-scop-detection.c

@@ -1055,10 +1055,12 @@ scop_detection::graphite_can_represent_expr (sese_l scop, loop_p loop,
 bool
 scop_detection::stmt_has_simple_data_refs_p (sese_l scop, gimple *stmt)
 {
-  loop_p nest = outermost_loop_in_sese (scop, gimple_bb (stmt));
+  loop_p nest;
   loop_p loop = loop_containing_stmt (stmt);
   if (!loop_in_sese_p (loop, scop))
-    loop = nest;
+    nest = loop;
+  else
+    nest = outermost_loop_in_sese (scop, gimple_bb (stmt));
 
   auto_vec<data_reference_p> drs;
   if (! graphite_find_data_references_in_stmt (nest, loop, stmt, &drs))
@@ -1450,11 +1452,12 @@ try_generate_gimple_bb (scop_p scop, basic_block bb)
   vec<scalar_use> reads = vNULL;
 
   sese_l region = scop->scop_info->region;
-  loop_p nest = outermost_loop_in_sese (region, bb);
+  loop_p nest;
-
   loop_p loop = bb->loop_father;
   if (!loop_in_sese_p (loop, region))
-    loop = nest;
+    nest = loop;
+  else
+    nest = outermost_loop_in_sese (region, bb);
 
   for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi);
        gsi_next (&gsi))

gcc/graphite-sese-to-poly.c

@@ -86,7 +86,7 @@ extract_affine_chrec (scop_p s, tree e, __isl_take isl_space *space)
   isl_pw_aff *lhs = extract_affine (s, CHREC_LEFT (e), isl_space_copy (space));
   isl_pw_aff *rhs = extract_affine (s, CHREC_RIGHT (e), isl_space_copy (space));
   isl_local_space *ls = isl_local_space_from_space (space);
-  unsigned pos = sese_loop_depth (s->scop_info->region, get_chrec_loop (e)) - 1;
+  unsigned pos = sese_loop_depth (s->scop_info->region, get_chrec_loop (e));
   isl_aff *loop = isl_aff_set_coefficient_si
     (isl_aff_zero_on_domain (ls), isl_dim_in, pos, 1);
   isl_pw_aff *l = isl_pw_aff_from_aff (loop);
@@ -756,10 +756,10 @@ add_loop_constraints (scop_p scop, __isl_take isl_set *domain, loop_p loop,
     return domain;
   const sese_l &region = scop->scop_info->region;
   if (!loop_in_sese_p (loop, region))
-    return domain;
+    ;
-
+  else
-  /* Recursion all the way up to the context loop.  */
+    /* Recursion all the way up to the context loop.  */
-  domain = add_loop_constraints (scop, domain, loop_outer (loop), context);
+    domain = add_loop_constraints (scop, domain, loop_outer (loop), context);
 
   /* Then, build constraints over the loop in post-order: outer to inner.  */
 
@@ -770,6 +770,21 @@ add_loop_constraints (scop_p scop, __isl_take isl_set *domain, loop_p loop,
   domain = add_iter_domain_dimension (domain, loop, scop);
   isl_space *space = isl_set_get_space (domain);
 
+  if (!loop_in_sese_p (loop, region))
+    {
+      /* 0 == loop_i */
+      isl_local_space *ls = isl_local_space_from_space (space);
+      isl_constraint *c = isl_equality_alloc (ls);
+      c = isl_constraint_set_coefficient_si (c, isl_dim_set, loop_index, 1);
+      if (dump_file)
+	{
+	  fprintf (dump_file, "[sese-to-poly] adding constraint to the domain: ");
+	  print_isl_constraint (dump_file, c);
+	}
+      domain = isl_set_add_constraint (domain, c);
+      return domain;
+    }
+
   /* 0 <= loop_i */
   isl_local_space *ls = isl_local_space_from_space (isl_space_copy (space));
   isl_constraint *c = isl_inequality_alloc (ls);

gcc/sese.h

@@ -326,8 +326,6 @@ gbb_loop_at_index (gimple_poly_bb_p gbb, sese_l &region, int index)
   while (--depth > index)
     loop = loop_outer (loop);
 
-  gcc_assert (loop_in_sese_p (loop, region));
-
   return loop;
 }
 

gcc/testsuite/ChangeLog

@@ -1,3 +1,10 @@
+2017-10-02  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/82355
+	* gcc.dg/graphite/fuse-1.c: Adjust.
+	* gcc.dg/graphite/fuse-2.c: Likewise.
+	* gcc.dg/graphite/pr82355.c: New testcase.
+
 2017-10-01  Jeff Law  <law@redhat.com>
 
 	* gcc.dg/tree-ssa/ssa-dom-simplify-1.c: New test.

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

@@ -1,15 +1,15 @@
 /* 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 -fdump-tree-graphite-all" } */
+/* { dg-options "-O2 -floop-nest-optimize -fdump-tree-forwprop4-all -fdump-tree-graphite-all" } */
 
 /* Make sure we fuse the loops like this:
 AST generated by isl:
 for (int c0 = 0; c0 <= 99; c0 += 1) {
-  S_3(c0);
+  S_3(0, c0);
-  S_6(c0);
+  S_6(0, c0);
-  S_9(c0);
+  S_9(0, c0);
 } */
-/* { dg-final { scan-tree-dump-times "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) \\{.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*\\}" 1 "graphite" } } */
+/* { dg-final { scan-tree-dump-times "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) \\{.*S_.*\\(0, c0\\);.*S_.*\\(0, c0\\);.*S_.*\\(0, 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" } } */

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

@@ -3,13 +3,13 @@
 /* Make sure we fuse the loops like this:
 AST generated by isl:
 for (int c0 = 0; c0 <= 99; c0 += 1) {
-  S_3(c0);
+  S_3(0, c0);
-  S_6(c0);
+  S_6(0, c0);
-  S_9(c0);
+  S_9(0, c0);
 }
 */
 
-/* { dg-final { scan-tree-dump-times "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) \\{.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*S_.*\\(c0\\);.*\\}" 1 "graphite" } } */
+/* { dg-final { scan-tree-dump-times "AST generated by isl:.*for \\(int c0 = 0; c0 <= 99; c0 \\+= 1\\) \\{.*S_.*\\(0, c0\\);.*S_.*\\(0, c0\\);.*S_.*\\(0, c0\\);.*\\}" 1 "graphite" } } */
 
 #define MAX 100
 int A[MAX], B[MAX], C[MAX];

gcc/testsuite/gcc.dg/graphite/pr82355.c

@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -floop-nest-optimize" } */
+
+int dc, at;
+
+void
+tv (int *ld, int jl)
+{
+  for (;;)
+    {
+      if (dc != 0)
+	for (;;)
+	  {
+	    *ld = !!(*ld) + 1;
+	    for (dc = 0; dc < 3; ++dc)
+	      at = (jl != 0) ? *ld : 0;
+	  }
+
+      while (at != 0)
+	{
+	}
+    }
+}