PR tree-optimization/46099

	* tree-parloops.c (take_address_of): Add GSI argument.  Return NULL
	if it is NULL and uid wasn't found in the hash table.  Just fold the
	result if it is NULL otherwise.  Insert other potentially needed
	stmts right before current stmt instead of on the entry edge.
	(struct elv_data): Add gsi and reset fields.
	(eliminate_local_variables_1): Adjust caller.  If take_address_of
	failed for debug stmt, set dta->reset and return.
	(eliminate_local_variables_stmt): Change STMT argument for GSI,
	pass GSI through to the callback, handle resetting of debug stmts.
	(eliminate_local_variables): Adjust caller.  Process debug stmts
	in second phase.

	* gcc.dg/autopar/pr46099.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@166355 138bc75d-0d04-0410-961f-82ee72b054a4

4 files changed, 121 insertions, 13 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9af445b0b85..b5c8c4bd765 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -3,6 +3,19 @@
 	* cfgexpand.c (expand_debug_expr): Handle MEM_REF
 	with non-zero offset.
 
+	PR tree-optimization/46099
+	* tree-parloops.c (take_address_of): Add GSI argument.  Return NULL
+	if it is NULL and uid wasn't found in the hash table.  Just fold the
+	result if it is NULL otherwise.  Insert other potentially needed
+	stmts right before current stmt instead of on the entry edge.
+	(struct elv_data): Add gsi and reset fields.
+	(eliminate_local_variables_1): Adjust caller.  If take_address_of
+	failed for debug stmt, set dta->reset and return.
+	(eliminate_local_variables_stmt): Change STMT argument for GSI,
+	pass GSI through to the callback, handle resetting of debug stmts.
+	(eliminate_local_variables): Adjust caller.  Process debug stmts
+	in second phase.
+
 	PR middle-end/43690
 	* gimplify.c (gimplify_asm_expr): If a "m" input is a
 	{pre,post}{in,de}crement, fail.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 8ac52a0d4af..96317720140 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2010-11-05  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/46099
+	* gcc.dg/autopar/pr46099.c: New test.
+
 	PR middle-end/43690
 	* c-c++-common/pr43690.c: New test.
 
diff --git a/gcc/testsuite/gcc.dg/autopar/pr46099.c b/gcc/testsuite/gcc.dg/autopar/pr46099.c
new file mode 100644
index 00000000000..074278e644b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/autopar/pr46099.c
@@ -0,0 +1,47 @@
+/* PR tree-optimization/46099 */
+/* { dg-do compile } */
+/* { dg-options "-ftree-parallelize-loops=2 -fcompare-debug -O" } */
+
+static inline void
+bar (int *i)
+{
+  int j = *i;
+}
+
+void baz (int *, int *, int *);
+
+void
+f1 (int n)
+{
+  int i;
+  for (i = 0; i < n; i++)
+    bar (&i);
+}
+
+void
+f2 (int n)
+{
+  int i;
+  int a[10000], b[10000], c[10000];
+  baz (a, b, c);
+  for (i = 0; i < n; i++)
+    {
+      void *p = c;
+      a[i] = b[i] + c[i];
+    }
+  baz (a, b, c);
+}
+
+void
+f3 (int n)
+{
+  int i;
+  int a[10000], b[10000], c[10000];
+  baz (a, b, c);
+  for (i = 0; i < n; i++)
+    {
+      a[i] = b[i] + c[i];
+      void *p = c;
+    }
+  baz (a, b, c);
+}
diff --git a/gcc/tree-parloops.c b/gcc/tree-parloops.c
index de9faefe778..a634b249a61 100644
--- a/gcc/tree-parloops.c
+++ b/gcc/tree-parloops.c
@@ -314,10 +314,12 @@ loop_has_blocks_with_irreducible_flag (struct loop *loop)
 /* Assigns the address of OBJ in TYPE to an ssa name, and returns this name.
    The assignment statement is placed on edge ENTRY.  DECL_ADDRESS maps decls
    to their addresses that can be reused.  The address of OBJ is known to
-   be invariant in the whole function.  */
+   be invariant in the whole function.  Other needed statements are placed
+   right before GSI.  */
 
 static tree
-take_address_of (tree obj, tree type, edge entry, htab_t decl_address)
+take_address_of (tree obj, tree type, edge entry, htab_t decl_address,
+		 gimple_stmt_iterator *gsi)
 {
   int uid;
   void **dslot;
@@ -346,6 +348,8 @@ take_address_of (tree obj, tree type, edge entry, htab_t decl_address)
   dslot = htab_find_slot_with_hash (decl_address, &ielt, uid, INSERT);
   if (!*dslot)
     {
+      if (gsi == NULL)
+	return NULL;
       addr = TREE_OPERAND (*var_p, 0);
       bvar = create_tmp_var (TREE_TYPE (addr),
 			     get_name (TREE_OPERAND
@@ -366,17 +370,20 @@ take_address_of (tree obj, tree type, edge entry, htab_t decl_address)
 
   /* Express the address in terms of the canonical SSA name.  */
   TREE_OPERAND (*var_p, 0) = name;
+  if (gsi == NULL)
+    return build_fold_addr_expr_with_type (obj, type);
+
   name = force_gimple_operand (build_addr (obj, current_function_decl),
 			       &stmts, true, NULL_TREE);
   if (!gimple_seq_empty_p (stmts))
-    gsi_insert_seq_on_edge_immediate (entry, stmts);
+    gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
 
   if (!useless_type_conversion_p (type, TREE_TYPE (name)))
     {
       name = force_gimple_operand (fold_convert (type, name), &stmts, true,
 				   NULL_TREE);
       if (!gimple_seq_empty_p (stmts))
-	gsi_insert_seq_on_edge_immediate (entry, stmts);
+	gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
     }
 
   return name;
@@ -438,7 +445,9 @@ struct elv_data
   struct walk_stmt_info info;
   edge entry;
   htab_t decl_address;
+  gimple_stmt_iterator *gsi;
   bool changed;
+  bool reset;
 };
 
 /* Eliminates references to local variables in *TP out of the single
@@ -462,7 +471,14 @@ eliminate_local_variables_1 (tree *tp, int *walk_subtrees, void *data)
 
       type = TREE_TYPE (t);
       addr_type = build_pointer_type (type);
-      addr = take_address_of (t, addr_type, dta->entry, dta->decl_address);
+      addr = take_address_of (t, addr_type, dta->entry, dta->decl_address,
+			      dta->gsi);
+      if (dta->gsi == NULL && addr == NULL_TREE)
+	{
+	  dta->reset = true;
+	  return NULL_TREE;
+	}
+
       *tp = build_simple_mem_ref (addr);
 
       dta->changed = true;
@@ -492,7 +508,13 @@ eliminate_local_variables_1 (tree *tp, int *walk_subtrees, void *data)
 	return NULL_TREE;
 
       addr_type = TREE_TYPE (t);
-      addr = take_address_of (obj, addr_type, dta->entry, dta->decl_address);
+      addr = take_address_of (obj, addr_type, dta->entry, dta->decl_address,
+			      dta->gsi);
+      if (dta->gsi == NULL && addr == NULL_TREE)
+	{
+	  dta->reset = true;
+	  return NULL_TREE;
+	}
       *tp = addr;
 
       dta->changed = true;
@@ -505,27 +527,40 @@ eliminate_local_variables_1 (tree *tp, int *walk_subtrees, void *data)
   return NULL_TREE;
 }
 
-/* Moves the references to local variables in STMT out of the single
+/* Moves the references to local variables in STMT at *GSI out of the single
    entry single exit region starting at ENTRY.  DECL_ADDRESS contains
    addresses of the references that had their address taken
    already.  */
 
 static void
-eliminate_local_variables_stmt (edge entry, gimple stmt,
+eliminate_local_variables_stmt (edge entry, gimple_stmt_iterator *gsi,
 				htab_t decl_address)
 {
   struct elv_data dta;
+  gimple stmt = gsi_stmt (*gsi);
 
   memset (&dta.info, '\0', sizeof (dta.info));
   dta.entry = entry;
   dta.decl_address = decl_address;
   dta.changed = false;
+  dta.reset = false;
 
   if (gimple_debug_bind_p (stmt))
-    walk_tree (gimple_debug_bind_get_value_ptr (stmt),
-	       eliminate_local_variables_1, &dta.info, NULL);
+    {
+      dta.gsi = NULL;
+      walk_tree (gimple_debug_bind_get_value_ptr (stmt),
+		 eliminate_local_variables_1, &dta.info, NULL);
+      if (dta.reset)
+	{
+	  gimple_debug_bind_reset_value (stmt);
+	  dta.changed = true;
+	}
+    }
   else
-    walk_gimple_op (stmt, eliminate_local_variables_1, &dta.info);
+    {
+      dta.gsi = gsi;
+      walk_gimple_op (stmt, eliminate_local_variables_1, &dta.info);
+    }
 
   if (dta.changed)
     update_stmt (stmt);
@@ -549,6 +584,7 @@ eliminate_local_variables (edge entry, edge exit)
   VEC (basic_block, heap) *body = VEC_alloc (basic_block, heap, 3);
   unsigned i;
   gimple_stmt_iterator gsi;
+  bool has_debug_stmt = false;
   htab_t decl_address = htab_create (10, int_tree_map_hash, int_tree_map_eq,
 				     free);
   basic_block entry_bb = entry->src;
@@ -559,8 +595,17 @@ eliminate_local_variables (edge entry, edge exit)
   FOR_EACH_VEC_ELT (basic_block, body, i, bb)
     if (bb != entry_bb && bb != exit_bb)
       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
-	eliminate_local_variables_stmt (entry, gsi_stmt (gsi),
-					decl_address);
+	if (gimple_debug_bind_p (gsi_stmt (gsi)))
+	  has_debug_stmt = true;
+	else
+	  eliminate_local_variables_stmt (entry, &gsi, decl_address);
+
+  if (has_debug_stmt)
+    FOR_EACH_VEC_ELT (basic_block, body, i, bb)
+      if (bb != entry_bb && bb != exit_bb)
+	for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
+	  if (gimple_debug_bind_p (gsi_stmt (gsi)))
+	    eliminate_local_variables_stmt (entry, &gsi, decl_address);
 
   htab_delete (decl_address);
   VEC_free (basic_block, heap, body);