cgraph.h (cgraph_indirect_call_info): New fields anc_offset, otr_token and polymorphic.

2010-05-17  Martin Jambor  <mjambor@suse.cz>

	* cgraph.h (cgraph_indirect_call_info): New fields anc_offset,
	otr_token and polymorphic.
	* cgraph.c (cgraph_create_indirect_edge): Inilialize the above fields.
	(cgraph_clone_edge): Copy the above fields.
	* tree.c (get_binfo_at_offset): New function.
	* tree.h (get_binfo_at_offset): Declare.
	* ipa-prop.h (enum jump_func_type): Added known_type jump function
	type, reordered items, updated comments.
	(union jump_func_value): Added base_type field, reordered fields.
	(enum ipa_lattice_type): Moved down in the file.
	(struct ipa_param_descriptor): New field polymorphic.
	(ipa_is_param_polymorphic): New function.
	* ipa-prop.c: Include gimple.h and gimple-fold.h.
	(ipa_print_node_jump_functions): Print known type jump functions.
	(compute_complex_pass_through): Renamed to...
	(compute_complex_assign_jump_func): this.
	(compute_complex_ancestor_jump_func): New function.
	(compute_known_type_jump_func): Likewise.
	(compute_scalar_jump_functions): Create known type and complex ancestor
	jump functions.
	(ipa_note_param_call): New parameter polymorphic, set the corresponding
	flag in the call note accordingly.
	(ipa_analyze_call_uses): Renamed to...
	(ipa_analyze_indirect_call_uses): this.  New parameter target, define
	variable var only in the block where it is used.
	(ipa_analyze_virtual_call_uses): New function.
	(ipa_analyze_call_uses): Likewise.
	(combine_known_type_and_ancestor_jfs): Likewise.
	(update_jump_functions_after_inlining): Implemented handling of a
	number of new jump function types combination.
	(print_edge_addition_message): Removed.
	(make_edge_direct_to_target): New function.
	(try_make_edge_direct_simple_call): Likewise.
	(try_make_edge_direct_virtual_call): Likewise.
	(update_call_notes_after_inlining): Renamed to...
	(update_indirect_edges_after_inlining): this.  Moved edge creation for
	indirect calls to try_make_edge_direct_simple_call, also calls
	try_make_edge_direct_virtual_call for virtual calls.
	(ipa_print_node_params): Changed the header message.
	(ipa_write_jump_function): Stream also known type jump functions.
	(ipa_read_jump_function): Likewise.
	(ipa_write_indirect_edge_info): Stream new fields in
	cgraph_indirect_call_info.
	(ipa_read_indirect_edge_info): Likewise.
	* Makefile.in (ipa-prop.o): Add dependency to GIMPLE_H and
	GIMPLE_FOLD_H.

	* testsuite/g++.dg/ipa/ivinline-1.C: New test.
	* testsuite/g++.dg/ipa/ivinline-2.C: New test.
	* testsuite/g++.dg/ipa/ivinline-3.C: New test.
	* testsuite/g++.dg/ipa/ivinline-4.C: New test.
	* testsuite/g++.dg/ipa/ivinline-5.C: New test.
	* testsuite/g++.dg/ipa/ivinline-6.C: New test.

From-SVN: r159507

16 files changed, 1082 insertions, 137 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a5c2bd2..a703760 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,52 @@
+2010-05-17  Martin Jambor  <mjambor@suse.cz>
+
+	* cgraph.h (cgraph_indirect_call_info): New fields anc_offset,
+	otr_token and polymorphic.
+	* cgraph.c (cgraph_create_indirect_edge): Inilialize the above fields.
+	(cgraph_clone_edge): Copy the above fields.
+	* tree.c (get_binfo_at_offset): New function.
+	* tree.h (get_binfo_at_offset): Declare.
+	* ipa-prop.h (enum jump_func_type): Added known_type jump function
+	type, reordered items, updated comments.
+	(union jump_func_value): Added base_type field, reordered fields.
+	(enum ipa_lattice_type): Moved down in the file.
+	(struct ipa_param_descriptor): New field polymorphic.
+	(ipa_is_param_polymorphic): New function.
+	* ipa-prop.c: Include gimple.h and gimple-fold.h.
+	(ipa_print_node_jump_functions): Print known type jump functions.
+	(compute_complex_pass_through): Renamed to...
+	(compute_complex_assign_jump_func): this.
+	(compute_complex_ancestor_jump_func): New function.
+	(compute_known_type_jump_func): Likewise.
+	(compute_scalar_jump_functions): Create known type and complex ancestor
+	jump functions.
+	(ipa_note_param_call): New parameter polymorphic, set the corresponding
+	flag in the call note accordingly.
+	(ipa_analyze_call_uses): Renamed to...
+	(ipa_analyze_indirect_call_uses): this.  New parameter target, define
+	variable var only in the block where it is used.
+	(ipa_analyze_virtual_call_uses): New function.
+	(ipa_analyze_call_uses): Likewise.
+	(combine_known_type_and_ancestor_jfs): Likewise.
+	(update_jump_functions_after_inlining): Implemented handling of a
+	number of new jump function types combination.
+	(print_edge_addition_message): Removed.
+	(make_edge_direct_to_target): New function.
+	(try_make_edge_direct_simple_call): Likewise.
+	(try_make_edge_direct_virtual_call): Likewise.
+	(update_call_notes_after_inlining): Renamed to...
+	(update_indirect_edges_after_inlining): this.  Moved edge creation for
+	indirect calls to try_make_edge_direct_simple_call, also calls
+	try_make_edge_direct_virtual_call for virtual calls.
+	(ipa_print_node_params): Changed the header message.
+	(ipa_write_jump_function): Stream also known type jump functions.
+	(ipa_read_jump_function): Likewise.
+	(ipa_write_indirect_edge_info): Stream new fields in
+	cgraph_indirect_call_info.
+	(ipa_read_indirect_edge_info): Likewise.
+	* Makefile.in (ipa-prop.o): Add dependency to GIMPLE_H and
+	GIMPLE_FOLD_H.
+
 2010-05-17  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* config/i386/sol2.h (TARGET_SUN_TLS): Remove duplicate definition.
diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 3d6cf2c..516ecae 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -2896,7 +2896,7 @@ ipa.o : ipa.c $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) $(CGRAPH_H) \
 ipa-prop.o : ipa-prop.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
    langhooks.h $(GGC_H) $(TARGET_H) $(CGRAPH_H) $(IPA_PROP_H) $(DIAGNOSTIC_H) \
    $(TREE_FLOW_H) $(TM_H) $(TREE_PASS_H) $(FLAGS_H) $(TREE_H) \
-   $(TREE_INLINE_H) $(TIMEVAR_H)
+   $(TREE_INLINE_H) $(GIMPLE_H) $(GIMPLE_FOLD_H) $(TIMEVAR_H)
 ipa-ref.o : ipa-ref.c $(CONFIG_H) $(SYSTEM_H) coretypes.h \
    langhooks.h $(GGC_H) $(TARGET_H) $(CGRAPH_H)  $(TREE_H) $(TARGET_H) \
    $(TREE_FLOW_H) $(TM_H) $(TREE_PASS_H) $(FLAGS_H) $(TREE_H) $(GGC_H) 
diff --git a/gcc/cgraph.c b/gcc/cgraph.c
index 29a1b36..89e431a 100644
--- a/gcc/cgraph.c
+++ b/gcc/cgraph.c
@@ -1045,7 +1045,7 @@ cgraph_create_indirect_edge (struct cgraph_node *caller, gimple call_stmt,
   edge->indirect_unknown_callee = 1;
   initialize_inline_failed (edge);
 
-  edge->indirect_info = GGC_NEW (struct cgraph_indirect_call_info);
+  edge->indirect_info = GGC_CNEW (struct cgraph_indirect_call_info);
   edge->indirect_info->param_index = -1;
   edge->indirect_info->ecf_flags = ecf_flags;
 
@@ -2026,7 +2026,7 @@ cgraph_clone_edge (struct cgraph_edge *e, struct cgraph_node *n,
 						  e->indirect_info->ecf_flags,
 						  count, freq,
 						  e->loop_nest + loop_nest);
-	  new_edge->indirect_info->param_index = e->indirect_info->param_index;
+	  *new_edge->indirect_info = *e->indirect_info;
 	}
     }
   else
diff --git a/gcc/cgraph.h b/gcc/cgraph.h
index f8d8e6e..2841d25 100644
--- a/gcc/cgraph.h
+++ b/gcc/cgraph.h
@@ -378,10 +378,21 @@ typedef enum {
 
 struct GTY(()) cgraph_indirect_call_info
 {
+  /* Offset accumulated from ancestor jump functions of inlined call graph
+     edges.  */
+  HOST_WIDE_INT anc_offset;
+  /* OBJ_TYPE_REF_TOKEN of a polymorphic call (if polymorphic is set).  */
+  HOST_WIDE_INT otr_token;
+  /* Type of the object from OBJ_TYPE_REF_OBJECT. */
+  tree otr_type;
   /* Index of the parameter that is called.  */
   int param_index;
   /* ECF flags determined from the caller.  */
   int ecf_flags;
+
+  /* Set when the call is a virtual call with the parameter being the
+     associated object pointer rather than a simple direct call.  */
+  unsigned polymorphic : 1;
 };
 
 struct GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller"))) cgraph_edge {
diff --git a/gcc/ipa-prop.c b/gcc/ipa-prop.c
index 3f80df0..e66aab5 100644
--- a/gcc/ipa-prop.c
+++ b/gcc/ipa-prop.c
@@ -30,6 +30,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "tree-flow.h"
 #include "tree-pass.h"
 #include "tree-inline.h"
+#include "gimple.h"
 #include "flags.h"
 #include "timevar.h"
 #include "flags.h"
@@ -290,6 +291,13 @@ ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node)
 	  fprintf (f, "       param %d: ", i);
 	  if (type == IPA_JF_UNKNOWN)
 	    fprintf (f, "UNKNOWN\n");
+	  else if (type == IPA_JF_KNOWN_TYPE)
+	    {
+	      tree binfo_type = TREE_TYPE (jump_func->value.base_binfo);
+	      fprintf (f, "KNOWN TYPE, type in binfo is: ");
+	      print_generic_expr (f, binfo_type, 0);
+	      fprintf (f, " (%u)\n", TYPE_UID (binfo_type));
+	    }
 	  else if (type == IPA_JF_CONST)
  	    {
 	      tree val = jump_func->value.constant;
@@ -327,9 +335,11 @@ ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node)
 	  else if (type == IPA_JF_ANCESTOR)
 	    {
 	      fprintf (f, "ANCESTOR: ");
-	      fprintf (f, "%d, offset "HOST_WIDE_INT_PRINT_DEC"\n",
+	      fprintf (f, "%d, offset "HOST_WIDE_INT_PRINT_DEC", ",
 		       jump_func->value.ancestor.formal_id,
 		       jump_func->value.ancestor.offset);
+	      print_generic_expr (f, jump_func->value.ancestor.type, 0);
+	      fprintf (dump_file, "\n");
 	    }
 	}
     }
@@ -349,51 +359,60 @@ ipa_print_all_jump_functions (FILE *f)
     }
 }
 
-/* Determine whether passing ssa name NAME constitutes a polynomial
-   pass-through function or getting an address of an acestor and if so, write
-   such a jump function to JFUNC.  INFO describes the caller.  */
+/* Given that an actual argument is an SSA_NAME (given in NAME) and is a result
+   of an assignment statement STMT, try to find out whether NAME can be
+   described by a (possibly polynomial) pass-through jump-function or an
+   ancestor jump function and if so, write the appropriate function into
+   JFUNC */
 
 static void
-compute_complex_pass_through (struct ipa_node_params *info,
-			      struct ipa_jump_func *jfunc,
-			      tree name)
+compute_complex_assign_jump_func (struct ipa_node_params *info,
+				  struct ipa_jump_func *jfunc,
+				  gimple stmt, tree name)
 {
   HOST_WIDE_INT offset, size, max_size;
   tree op1, op2, type;
   int index;
-  gimple stmt = SSA_NAME_DEF_STMT (name);
 
-  if (!is_gimple_assign (stmt))
-    return;
   op1 = gimple_assign_rhs1 (stmt);
   op2 = gimple_assign_rhs2 (stmt);
 
-  if (op2)
+  if (TREE_CODE (op1) == SSA_NAME
+      && SSA_NAME_IS_DEFAULT_DEF (op1))
     {
-      if (TREE_CODE (op1) != SSA_NAME
-	  || !SSA_NAME_IS_DEFAULT_DEF (op1)
-	  || (TREE_CODE_CLASS (gimple_expr_code (stmt)) != tcc_comparison
-	      && !useless_type_conversion_p (TREE_TYPE (name),
-					     TREE_TYPE (op1)))
-	  || !is_gimple_ip_invariant (op2))
+      index = ipa_get_param_decl_index (info, SSA_NAME_VAR (op1));
+      if (index < 0)
 	return;
 
-      index = ipa_get_param_decl_index (info, SSA_NAME_VAR (op1));
-      if (index >= 0)
+      if (op2)
 	{
+	  if (!is_gimple_ip_invariant (op2)
+	      || (TREE_CODE_CLASS (gimple_expr_code (stmt)) != tcc_comparison
+		  && !useless_type_conversion_p (TREE_TYPE (name),
+						 TREE_TYPE (op1))))
+	    return;
+
 	  jfunc->type = IPA_JF_PASS_THROUGH;
 	  jfunc->value.pass_through.formal_id = index;
 	  jfunc->value.pass_through.operation = gimple_assign_rhs_code (stmt);
 	  jfunc->value.pass_through.operand = op2;
 	}
+      else if (gimple_assign_unary_nop_p (stmt))
+	{
+	  jfunc->type = IPA_JF_PASS_THROUGH;
+	  jfunc->value.pass_through.formal_id = index;
+	  jfunc->value.pass_through.operation = NOP_EXPR;
+	}
       return;
     }
 
   if (TREE_CODE (op1) != ADDR_EXPR)
     return;
+
   op1 = TREE_OPERAND (op1, 0);
   type = TREE_TYPE (op1);
-
+  if (TREE_CODE (type) != RECORD_TYPE)
+    return;
   op1 = get_ref_base_and_extent (op1, &offset, &size, &max_size);
   if (TREE_CODE (op1) != INDIRECT_REF
       /* If this is a varying address, punt.  */
@@ -416,6 +435,120 @@ compute_complex_pass_through (struct ipa_node_params *info,
 }
 
 
+/* Given that an actual argument is an SSA_NAME that is a result of a phi
+   statement PHI, try to find out whether NAME is in fact a
+   multiple-inheritance typecast from a descendant into an ancestor of a formal
+   parameter and thus can be described by an ancestor jump function and if so,
+   write the appropriate function into JFUNC.
+
+   Essentially we want to match the following pattern:
+
+     if (obj_2(D) != 0B)
+       goto <bb 3>;
+     else
+       goto <bb 4>;
+
+   <bb 3>:
+     iftmp.1_3 = &obj_2(D)->D.1762;
+
+   <bb 4>:
+     # iftmp.1_1 = PHI <iftmp.1_3(3), 0B(2)>
+     D.1879_6 = middleman_1 (iftmp.1_1, i_5(D));
+     return D.1879_6;  */
+
+static void
+compute_complex_ancestor_jump_func (struct ipa_node_params *info,
+				    struct ipa_jump_func *jfunc,
+				    gimple phi)
+{
+  HOST_WIDE_INT offset, size, max_size;
+  gimple assign, cond;
+  basic_block phi_bb, assign_bb, cond_bb;
+  tree tmp, parm, expr;
+  int index, i;
+
+  if (gimple_phi_num_args (phi) != 2
+      || !integer_zerop (PHI_ARG_DEF (phi, 1)))
+    return;
+
+  tmp = PHI_ARG_DEF (phi, 0);
+  if (TREE_CODE (tmp) != SSA_NAME
+      || SSA_NAME_IS_DEFAULT_DEF (tmp)
+      || !POINTER_TYPE_P (TREE_TYPE (tmp))
+      || TREE_CODE (TREE_TYPE (TREE_TYPE (tmp))) != RECORD_TYPE)
+    return;
+
+  assign = SSA_NAME_DEF_STMT (tmp);
+  assign_bb = gimple_bb (assign);
+  if (!single_pred_p (assign_bb)
+      || !gimple_assign_single_p (assign))
+    return;
+  expr = gimple_assign_rhs1 (assign);
+
+  if (TREE_CODE (expr) != ADDR_EXPR)
+    return;
+  expr = TREE_OPERAND (expr, 0);
+  expr = get_ref_base_and_extent (expr, &offset, &size, &max_size);
+
+  if (TREE_CODE (expr) != INDIRECT_REF
+      /* If this is a varying address, punt.  */
+      || max_size == -1
+      || max_size != size)
+    return;
+  parm = TREE_OPERAND (expr, 0);
+  if (TREE_CODE (parm) != SSA_NAME
+      || !SSA_NAME_IS_DEFAULT_DEF (parm))
+    return;
+
+  index = ipa_get_param_decl_index (info, SSA_NAME_VAR (parm));
+  if (index < 0)
+    return;
+
+  cond_bb = single_pred (assign_bb);
+  cond = last_stmt (cond_bb);
+  if (gimple_code (cond) != GIMPLE_COND
+      || gimple_cond_code (cond) != NE_EXPR
+      || gimple_cond_lhs (cond) != parm
+      || !integer_zerop (gimple_cond_rhs (cond)))
+    return;
+
+
+  phi_bb = gimple_bb (phi);
+  for (i = 0; i < 2; i++)
+    {
+      basic_block pred = EDGE_PRED (phi_bb, i)->src;
+      if (pred != assign_bb && pred != cond_bb)
+	return;
+    }
+
+  jfunc->type = IPA_JF_ANCESTOR;
+  jfunc->value.ancestor.formal_id = index;
+  jfunc->value.ancestor.offset = offset;
+  jfunc->value.ancestor.type = TREE_TYPE (TREE_TYPE (tmp));
+}
+
+/* Given OP whch is passed as an actual argument to a called function,
+   determine if it is possible to construct a KNOWN_TYPE jump function for it
+   and if so, create one and store it to JFUNC.  */
+
+static void
+compute_known_type_jump_func (tree op, struct ipa_jump_func *jfunc)
+{
+  tree binfo;
+
+  if (TREE_CODE (op) != ADDR_EXPR)
+    return;
+
+  op = TREE_OPERAND (op, 0);
+  binfo = gimple_get_relevant_ref_binfo (op, NULL_TREE);
+  if (binfo)
+    {
+      jfunc->type = IPA_JF_KNOWN_TYPE;
+      jfunc->value.base_binfo = binfo;
+    }
+}
+
+
 /* Determine the jump functions of scalar arguments.  Scalar means SSA names
    and constants of a number of selected types.  INFO is the ipa_node_params
    structure associated with the caller, FUNCTIONS is a pointer to an array of
@@ -453,8 +586,18 @@ compute_scalar_jump_functions (struct ipa_node_params *info,
 		}
 	    }
 	  else
-	    compute_complex_pass_through (info, &functions[num], arg);
+	    {
+	      gimple stmt = SSA_NAME_DEF_STMT (arg);
+	      if (is_gimple_assign (stmt))
+		compute_complex_assign_jump_func (info, &functions[num],
+						  stmt, arg);
+	      else if (gimple_code (stmt) == GIMPLE_PHI)
+		compute_complex_ancestor_jump_func (info, &functions[num],
+						    stmt);
+	    }
 	}
+      else
+	compute_known_type_jump_func (arg, &functions[num]);
     }
 }
 
@@ -749,17 +892,29 @@ ipa_is_ssa_with_stmt_def (tree t)
     return false;
 }
 
-/* Create a new indirect call graph edge describing a call to a parameter
-   number FORMAL_ID and and set the called flag of the parameter.  NODE is the
-   caller.  STMT is the corresponding call statement.  */
+/* Find the indirect call graph edge corresponding to STMT and add to it all
+   information necessary to describe a call to a parameter number PARAM_INDEX.
+   NODE is the caller.  POLYMORPHIC should be set to true iff the call is a
+   virtual one.  */
 
 static void
-ipa_note_param_call (struct cgraph_node *node, int formal_id, gimple stmt)
+ipa_note_param_call (struct cgraph_node *node, int param_index, gimple stmt,
+		     bool polymorphic)
 {
   struct cgraph_edge *cs;
 
   cs = cgraph_edge (node, stmt);
-  cs->indirect_info->param_index = formal_id;
+  cs->indirect_info->param_index = param_index;
+  cs->indirect_info->anc_offset = 0;
+  cs->indirect_info->polymorphic = polymorphic;
+  if (polymorphic)
+    {
+      tree otr = gimple_call_fn (stmt);
+      tree type, token = OBJ_TYPE_REF_TOKEN (otr);
+      cs->indirect_info->otr_token = tree_low_cst (token, 1);
+      type = TREE_TYPE (TREE_TYPE (OBJ_TYPE_REF_OBJECT (otr)));
+      cs->indirect_info->otr_type = type;
+    }
 }
 
 /* Analyze the CALL and examine uses of formal parameters of the caller NODE
@@ -809,12 +964,11 @@ ipa_note_param_call (struct cgraph_node *node, int formal_id, gimple stmt)
 */
 
 static void
-ipa_analyze_call_uses (struct cgraph_node *node, struct ipa_node_params *info,
-		       gimple call)
+ipa_analyze_indirect_call_uses (struct cgraph_node *node,
+				struct ipa_node_params *info,
+				gimple call, tree target)
 {
-  tree target = gimple_call_fn (call);
   gimple def;
-  tree var;
   tree n1, n2;
   gimple d1, d2;
   tree rec, rec2, cond;
@@ -822,16 +976,12 @@ ipa_analyze_call_uses (struct cgraph_node *node, struct ipa_node_params *info,
   int index;
   basic_block bb, virt_bb, join;
 
-  if (TREE_CODE (target) != SSA_NAME)
-    return;
-
-  var = SSA_NAME_VAR (target);
   if (SSA_NAME_IS_DEFAULT_DEF (target))
     {
-      /* assuming TREE_CODE (var) == PARM_DECL */
+      tree var = SSA_NAME_VAR (target);
       index = ipa_get_param_decl_index (info, var);
       if (index >= 0)
-	ipa_note_param_call (node, index, call);
+	ipa_note_param_call (node, index, call, false);
       return;
     }
 
@@ -928,11 +1078,63 @@ ipa_analyze_call_uses (struct cgraph_node *node, struct ipa_node_params *info,
 
   index = ipa_get_param_decl_index (info, rec);
   if (index >= 0 && !ipa_is_param_modified (info, index))
-    ipa_note_param_call (node, index, call);
+    ipa_note_param_call (node, index, call, false);
 
   return;
 }
 
+/* Analyze a CALL to an OBJ_TYPE_REF which is passed in TARGET and if the
+   object referenced in the expression is a formal parameter of the caller
+   (described by INFO), create a call note for the statement. */
+
+static void
+ipa_analyze_virtual_call_uses (struct cgraph_node *node,
+			       struct ipa_node_params *info, gimple call,
+			       tree target)
+{
+  tree obj = OBJ_TYPE_REF_OBJECT (target);
+  tree var;
+  int index;
+
+  if (TREE_CODE (obj) == ADDR_EXPR)
+    {
+      do
+	{
+	  obj = TREE_OPERAND (obj, 0);
+	}
+      while (TREE_CODE (obj) == COMPONENT_REF);
+      if (TREE_CODE (obj) != INDIRECT_REF)
+	return;
+      obj = TREE_OPERAND (obj, 0);
+    }
+
+  if (TREE_CODE (obj) != SSA_NAME
+      || !SSA_NAME_IS_DEFAULT_DEF (obj))
+    return;
+
+  var = SSA_NAME_VAR (obj);
+  index = ipa_get_param_decl_index (info, var);
+
+  if (index >= 0)
+    ipa_note_param_call (node, index, call, true);
+}
+
+/* Analyze a call statement CALL whether and how it utilizes formal parameters
+   of the caller (described by INFO). */
+
+static void
+ipa_analyze_call_uses (struct cgraph_node *node,
+		       struct ipa_node_params *info, gimple call)
+{
+  tree target = gimple_call_fn (call);
+
+  if (TREE_CODE (target) == SSA_NAME)
+    ipa_analyze_indirect_call_uses (node, info, call, target);
+  else if (TREE_CODE (target) == OBJ_TYPE_REF)
+    ipa_analyze_virtual_call_uses (node, info, call, target);
+}
+
+
 /* Analyze the call statement STMT with respect to formal parameters (described
    in INFO) of caller given by NODE.  Currently it only checks whether formal
    parameters are called.  */
@@ -974,12 +1176,31 @@ ipa_analyze_params_uses (struct cgraph_node *node)
   info->uses_analysis_done = 1;
 }
 
+/* Update the jump function DST when the call graph edge correspondng to SRC is
+   is being inlined, knowing that DST is of type ancestor and src of known
+   type.  */
+
+static void
+combine_known_type_and_ancestor_jfs (struct ipa_jump_func *src,
+				     struct ipa_jump_func *dst)
+{
+  tree new_binfo;
+
+  new_binfo = get_binfo_at_offset (src->value.base_binfo,
+				   dst->value.ancestor.offset,
+				   dst->value.ancestor.type);
+  if (new_binfo)
+    {
+      dst->type = IPA_JF_KNOWN_TYPE;
+      dst->value.base_binfo = new_binfo;
+    }
+  else
+    dst->type = IPA_JF_UNKNOWN;
+}
+
 /* Update the jump functions associated with call graph edge E when the call
    graph edge CS is being inlined, assuming that E->caller is already (possibly
-   indirectly) inlined into CS->callee and that E has not been inlined.
-
-   We keep pass through functions only if they do not contain any operation.
-   This is sufficient for inlining and greately simplifies things.  */
+   indirectly) inlined into CS->callee and that E has not been inlined.  */
 
 static void
 update_jump_functions_after_inlining (struct cgraph_edge *cs,
@@ -992,51 +1213,161 @@ update_jump_functions_after_inlining (struct cgraph_edge *cs,
 
   for (i = 0; i < count; i++)
     {
-      struct ipa_jump_func *src, *dst = ipa_get_ith_jump_func (args, i);
+      struct ipa_jump_func *dst = ipa_get_ith_jump_func (args, i);
 
       if (dst->type == IPA_JF_ANCESTOR)
 	{
-	  dst->type = IPA_JF_UNKNOWN;
-	  continue;
-	}
+	  struct ipa_jump_func *src;
 
-      if (dst->type != IPA_JF_PASS_THROUGH)
-	continue;
+	  /* Variable number of arguments can cause havoc if we try to access
+	     one that does not exist in the inlined edge.  So make sure we
+	     don't.  */
+	  if (dst->value.ancestor.formal_id >= ipa_get_cs_argument_count (top))
+	    {
+	      dst->type = IPA_JF_UNKNOWN;
+	      continue;
+	    }
 
-      /* We must check range due to calls with variable number of arguments and
-	 we cannot combine jump functions with operations.  */
-      if (dst->value.pass_through.operation != NOP_EXPR
-	  || (dst->value.pass_through.formal_id
-	      >= ipa_get_cs_argument_count (top)))
+	  src = ipa_get_ith_jump_func (top, dst->value.ancestor.formal_id);
+	  if (src->type == IPA_JF_KNOWN_TYPE)
+	    combine_known_type_and_ancestor_jfs (src, dst);
+	  else if (src->type == IPA_JF_CONST)
+	    {
+	      struct ipa_jump_func kt_func;
+
+	      kt_func.type = IPA_JF_UNKNOWN;
+	      compute_known_type_jump_func (src->value.constant, &kt_func);
+	      if (kt_func.type == IPA_JF_KNOWN_TYPE)
+		combine_known_type_and_ancestor_jfs (&kt_func, dst);
+	      else
+		dst->type = IPA_JF_UNKNOWN;
+	    }
+	  else if (src->type == IPA_JF_PASS_THROUGH
+		   && src->value.pass_through.operation == NOP_EXPR)
+	    dst->value.ancestor.formal_id = src->value.pass_through.formal_id;
+	  else if (src->type == IPA_JF_ANCESTOR)
+	    {
+	      dst->value.ancestor.formal_id = src->value.ancestor.formal_id;
+	      dst->value.ancestor.offset += src->value.ancestor.offset;
+	    }
+	  else
+	    dst->type = IPA_JF_UNKNOWN;
+	}
+      else if (dst->type == IPA_JF_PASS_THROUGH)
 	{
-	  dst->type = IPA_JF_UNKNOWN;
-	  continue;
+	  struct ipa_jump_func *src;
+	  /* We must check range due to calls with variable number of arguments
+	     and we cannot combine jump functions with operations.  */
+	  if (dst->value.pass_through.operation == NOP_EXPR
+	      && (dst->value.pass_through.formal_id
+		  < ipa_get_cs_argument_count (top)))
+	    {
+	      src = ipa_get_ith_jump_func (top,
+					   dst->value.pass_through.formal_id);
+	      *dst = *src;
+	    }
+	  else
+	    dst->type = IPA_JF_UNKNOWN;
 	}
+    }
+}
+
+/* If TARGET is an addr_expr of a function declaration, make it the destination
+   of an indirect edge IE and return the edge.  Otherwise, return NULL.  */
 
-      src = ipa_get_ith_jump_func (top, dst->value.pass_through.formal_id);
-      *dst = *src;
+static struct cgraph_edge *
+make_edge_direct_to_target (struct cgraph_edge *ie, tree target)
+{
+  struct cgraph_node *callee;
+
+  if (TREE_CODE (target) != ADDR_EXPR)
+    return NULL;
+  target = TREE_OPERAND (target, 0);
+  if (TREE_CODE (target) != FUNCTION_DECL)
+    return NULL;
+  callee = cgraph_node (target);
+  if (!callee)
+    return NULL;
+
+  cgraph_make_edge_direct (ie, callee);
+  if (dump_file)
+    {
+      fprintf (dump_file, "ipa-prop: Discovered %s call to a known target "
+	       "(%s/%i -> %s/%i) for stmt ",
+	       ie->indirect_info->polymorphic ? "a virtual" : "an indirect",
+	       cgraph_node_name (ie->caller), ie->caller->uid,
+	       cgraph_node_name (ie->callee), ie->callee->uid);
+
+      if (ie->call_stmt)
+	print_gimple_stmt (dump_file, ie->call_stmt, 2, TDF_SLIM);
+      else
+	fprintf (dump_file, "with uid %i\n", ie->lto_stmt_uid);
     }
+  return ie;
 }
 
-/* Print out a debug message to file F that we have discovered that an indirect
-   call described by NT is in fact a call of a known constant function described
-   by JFUNC.  NODE is the node where the call is.  */
+/* Try to find a destination for indirect edge IE that corresponds to a simple
+   call or a call of a member function pointer and where the destination is a
+   pointer formal parameter described by jump function JFUNC.  If it can be
+   determined, return the newly direct edge, otherwise return NULL.  */
 
-static void
-print_edge_addition_message (FILE *f, struct cgraph_edge *e,
-			     struct ipa_jump_func *jfunc)
+static struct cgraph_edge *
+try_make_edge_direct_simple_call (struct cgraph_edge *ie,
+				  struct ipa_jump_func *jfunc)
 {
-  fprintf (f, "ipa-prop: Discovered an indirect call to a known target (");
-  if (jfunc->type == IPA_JF_CONST_MEMBER_PTR)
+  tree target;
+
+  if (jfunc->type == IPA_JF_CONST)
+    target = jfunc->value.constant;
+  else if (jfunc->type == IPA_JF_CONST_MEMBER_PTR)
+    target = jfunc->value.member_cst.pfn;
+  else
+    return NULL;
+
+  return make_edge_direct_to_target (ie, target);
+}
+
+/* Try to find a destination for indirect edge IE that corresponds to a
+   virtuall call based on a formal parameter which is described by jump
+   function JFUNC and if it can be determined, make it direct and return the
+   direct edge.  Otherwise, return NULL.  */
+
+static struct cgraph_edge *
+try_make_edge_direct_virtual_call (struct cgraph_edge *ie,
+				   struct ipa_jump_func *jfunc)
+{
+  tree binfo, type, target;
+  HOST_WIDE_INT token;
+
+  if (jfunc->type == IPA_JF_KNOWN_TYPE)
+    binfo = jfunc->value.base_binfo;
+  else if (jfunc->type == IPA_JF_CONST)
     {
-      print_node_brief (f, "", jfunc->value.member_cst.pfn, 0);
-      print_node_brief (f, ", ", jfunc->value.member_cst.delta, 0);
+      tree cst = jfunc->value.constant;
+      if (TREE_CODE (cst) == ADDR_EXPR)
+	binfo = gimple_get_relevant_ref_binfo (TREE_OPERAND (cst, 0),
+					       NULL_TREE);
+      else
+  	return NULL;
     }
   else
-    print_node_brief(f, "", jfunc->value.constant, 0);
+    return NULL;
 
-  fprintf (f, ") in %s: ", cgraph_node_name (e->caller));
-  print_gimple_stmt (f, e->call_stmt, 2, TDF_SLIM);
+  if (!binfo)
+    return NULL;
+
+  token = ie->indirect_info->otr_token;
+  type = ie->indirect_info->otr_type;
+  binfo = get_binfo_at_offset (binfo, ie->indirect_info->anc_offset, type);
+  if (binfo)
+    target = gimple_fold_obj_type_ref_known_binfo (token, binfo);
+  else
+    return NULL;
+
+  if (target)
+    return make_edge_direct_to_target (ie, target);
+  else
+    return NULL;
 }
 
 /* Update the param called notes associated with NODE when CS is being inlined,
@@ -1051,7 +1382,7 @@ update_indirect_edges_after_inlining (struct cgraph_edge *cs,
 				      VEC (cgraph_edge_p, heap) **new_edges)
 {
   struct ipa_edge_args *top = IPA_EDGE_REF (cs);
-  struct cgraph_edge *ie, *next_ie;
+  struct cgraph_edge *ie, *next_ie, *new_direct_edge;
   bool res = false;
 
   ipa_check_create_edge_args ();
@@ -1081,44 +1412,30 @@ update_indirect_edges_after_inlining (struct cgraph_edge *cs,
       if (jfunc->type == IPA_JF_PASS_THROUGH
 	  && jfunc->value.pass_through.operation == NOP_EXPR)
 	ici->param_index = jfunc->value.pass_through.formal_id;
-      else if (jfunc->type == IPA_JF_CONST
-	       || jfunc->type == IPA_JF_CONST_MEMBER_PTR)
+      else if (jfunc->type == IPA_JF_ANCESTOR)
 	{
-	  struct cgraph_node *callee;
-	  tree decl;
-
-	  bitmap_set_bit (iinlining_processed_edges, ie->uid);
-	  if (jfunc->type == IPA_JF_CONST_MEMBER_PTR)
-	    decl = jfunc->value.member_cst.pfn;
-	  else
-	    decl = jfunc->value.constant;
-
-	  if (TREE_CODE (decl) != ADDR_EXPR)
-	    continue;
-	  decl = TREE_OPERAND (decl, 0);
-
-	  if (TREE_CODE (decl) != FUNCTION_DECL)
-	    continue;
-	  callee = cgraph_node (decl);
-	  if (!callee || !callee->local.inlinable)
-	    continue;
-
-	  res = true;
-	  if (dump_file)
-	    print_edge_addition_message (dump_file, ie, jfunc);
-
-	  cgraph_make_edge_direct (ie, callee);
-	  ie->indirect_inlining_edge = 1;
-	  if (new_edges)
-	    VEC_safe_push (cgraph_edge_p, heap, *new_edges, ie);
-	  top = IPA_EDGE_REF (cs);
+ 	  ici->param_index = jfunc->value.ancestor.formal_id;
+ 	  ici->anc_offset += jfunc->value.ancestor.offset;
 	}
       else
+	/* Either we can find a destination for this edge now or never. */
+	bitmap_set_bit (iinlining_processed_edges, ie->uid);
+
+      if (ici->polymorphic)
+	new_direct_edge = try_make_edge_direct_virtual_call (ie, jfunc);
+      else
+	new_direct_edge = try_make_edge_direct_simple_call (ie, jfunc);
+
+      if (new_direct_edge)
 	{
-	  /* Ancestor jump functions and pass theoughs with operations should
-	     not be used on parameters that then get called.  */
-	  gcc_assert (jfunc->type == IPA_JF_UNKNOWN);
-	  bitmap_set_bit (iinlining_processed_edges, ie->uid);
+	  new_direct_edge->indirect_inlining_edge = 1;
+	  if (new_edges)
+	    {
+	      VEC_safe_push (cgraph_edge_p, heap, *new_edges,
+			     new_direct_edge);
+	      top = IPA_EDGE_REF (cs);
+	      res = true;
+	    }
 	}
     }
 
@@ -1417,7 +1734,8 @@ ipa_print_node_params (FILE * f, struct cgraph_node *node)
   if (!node->analyzed)
     return;
   info = IPA_NODE_REF (node);
-  fprintf (f, "  function  %s Trees :: \n", cgraph_node_name (node));
+  fprintf (f, "  function  %s parameter descriptors:\n",
+	   cgraph_node_name (node));
   count = ipa_get_param_count (info);
   for (i = 0; i < count; i++)
     {
@@ -1909,6 +2227,9 @@ ipa_write_jump_function (struct output_block *ob,
     {
     case IPA_JF_UNKNOWN:
       break;
+    case IPA_JF_KNOWN_TYPE:
+      lto_output_tree (ob, jump_func->value.base_binfo, true);
+      break;
     case IPA_JF_CONST:
       lto_output_tree (ob, jump_func->value.constant, true);
       break;
@@ -1946,6 +2267,9 @@ ipa_read_jump_function (struct lto_input_block *ib,
     {
     case IPA_JF_UNKNOWN:
       break;
+    case IPA_JF_KNOWN_TYPE:
+      jump_func->value.base_binfo = lto_input_tree (ib, data_in);
+      break;
     case IPA_JF_CONST:
       jump_func->value.constant = lto_input_tree (ib, data_in);
       break;
@@ -1974,8 +2298,20 @@ ipa_write_indirect_edge_info (struct output_block *ob,
 			      struct cgraph_edge *cs)
 {
   struct cgraph_indirect_call_info *ii = cs->indirect_info;
+  struct bitpack_d *bp;
 
   lto_output_sleb128_stream (ob->main_stream, ii->param_index);
+  lto_output_sleb128_stream (ob->main_stream, ii->anc_offset);
+  bp = bitpack_create ();
+  bp_pack_value (bp, ii->polymorphic, 1);
+  lto_output_bitpack (ob->main_stream, bp);
+  bitpack_delete (bp);
+
+  if (ii->polymorphic)
+    {
+      lto_output_sleb128_stream (ob->main_stream, ii->otr_token);
+      lto_output_tree (ob, ii->otr_type, true);
+    }
 }
 
 /* Read in parts of cgraph_indirect_call_info corresponding to CS that are
@@ -1987,8 +2323,18 @@ ipa_read_indirect_edge_info (struct lto_input_block *ib,
 			     struct cgraph_edge *cs)
 {
   struct cgraph_indirect_call_info *ii = cs->indirect_info;
+  struct bitpack_d *bp;
 
   ii->param_index = (int) lto_input_sleb128 (ib);
+  ii->anc_offset = (HOST_WIDE_INT) lto_input_sleb128 (ib);
+  bp = lto_input_bitpack (ib);
+  ii->polymorphic = bp_unpack_value (bp, 1);
+  bitpack_delete (bp);
+  if (ii->polymorphic)
+    {
+      ii->otr_token = (HOST_WIDE_INT) lto_input_sleb128 (ib);
+      ii->otr_type = lto_input_tree (ib, data_in);
+    }
 }
 
 /* Stream out NODE info to OB.  */
diff --git a/gcc/ipa-prop.h b/gcc/ipa-prop.h
index 5a293d9..0f9b5f3 100644
--- a/gcc/ipa-prop.h
+++ b/gcc/ipa-prop.h
@@ -39,38 +39,40 @@ along with GCC; see the file COPYING3.  If not see
                   argument.
    Unknown      - neither of the above.
 
-   IPA_JF_CONST_MEMBER_PTR stands for C++ member pointers, other constants are
-   represented with IPA_JF_CONST.
+   IPA_JF_CONST_MEMBER_PTR stands for C++ member pointers, it is a special
+   constant in this regard.  Other constants are represented with IPA_JF_CONST.
+
+   IPA_JF_ANCESTOR is a special pass-through jump function, which means that
+   the result is an address of a part of the object pointed to by the formal
+   parameter to which the function refers.  It is mainly intended to represent
+   getting addresses of of ancestor fields in C++
+   (e.g. &this_1(D)->D.1766.D.1756).  Note that if the original pointer is
+   NULL, ancestor jump function must behave like a simple pass-through.
+
+   Other pass-through functions can either simply pass on an unchanged formal
+   parameter or can apply one simple binary operation to it (such jump
+   functions are called polynomial).
+
+   IPA_JF_KNOWN_TYPE is a special type of an "unknown" function that applies
+   only to pointer parameters.  It means that even though we cannot prove that
+   the passed value is an interprocedural constant, we still know the exact
+   type of the containing object which may be valuable for devirtualization.
+
+   Jump functions are computed in ipa-prop.c by function
+   update_call_notes_after_inlining.  Some information can be lost and jump
+   functions degraded accordingly when inlining, see
+   update_call_notes_after_inlining in the same file.  */
 
-   In addition to "ordinary" pass through functions represented by
-   IPA_JF_PASS_THROUGH, IPA_JF_ANCESTOR represents getting addresses of of
-   ancestor fields in C++ (e.g. &this_1(D)->D.1766.D.1756).  */
 enum jump_func_type
 {
   IPA_JF_UNKNOWN = 0,  /* newly allocated and zeroed jump functions default */
-  IPA_JF_CONST,
-  IPA_JF_CONST_MEMBER_PTR,
-  IPA_JF_PASS_THROUGH,
-  IPA_JF_ANCESTOR
+  IPA_JF_KNOWN_TYPE,        /* represented by field base_binfo */
+  IPA_JF_CONST,             /* represented by field costant */
+  IPA_JF_CONST_MEMBER_PTR,  /* represented by field member_cst */
+  IPA_JF_PASS_THROUGH,	    /* represented by field pass_through */
+  IPA_JF_ANCESTOR	    /* represented by field ancestor */
 };
 
-/* All formal parameters in the program have a lattice associated with it
-   computed by the interprocedural stage of IPCP.
-   There are three main values of the lattice:
-   IPA_TOP - unknown,
-   IPA_BOTTOM - non constant,
-   IPA_CONST_VALUE - simple scalar constant,
-   Cval of formal f will have a constant value if all callsites to this
-   function have the same constant value passed to f.
-   Integer and real constants are represented as IPA_CONST_VALUE.  */
-enum ipa_lattice_type
-{
-  IPA_BOTTOM,
-  IPA_CONST_VALUE,
-  IPA_TOP
-};
-
-
 /* Structure holding data required to describe a pass-through jump function.  */
 
 struct GTY(()) ipa_pass_through_data
@@ -87,8 +89,8 @@ struct GTY(()) ipa_pass_through_data
   enum tree_code operation;
 };
 
-/* Structure holding data required to describe and ancestor pass throu
-   funkci.  */
+/* Structure holding data required to describe an ancestor pass-through
+   jump function.  */
 
 struct GTY(()) ipa_ancestor_jf_data
 {
@@ -119,13 +121,30 @@ struct GTY (()) ipa_jump_func
      functions and member_cst holds constant c++ member functions.  */
   union jump_func_value
   {
+    tree GTY ((tag ("IPA_JF_KNOWN_TYPE"))) base_binfo;
     tree GTY ((tag ("IPA_JF_CONST"))) constant;
+    struct ipa_member_ptr_cst GTY ((tag ("IPA_JF_CONST_MEMBER_PTR"))) member_cst;
     struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
     struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
-    struct ipa_member_ptr_cst GTY ((tag ("IPA_JF_CONST_MEMBER_PTR"))) member_cst;
   } GTY ((desc ("%1.type"))) value;
 };
 
+/* All formal parameters in the program have a lattice associated with it
+   computed by the interprocedural stage of IPCP.
+   There are three main values of the lattice:
+   IPA_TOP - unknown,
+   IPA_BOTTOM - non constant,
+   IPA_CONST_VALUE - simple scalar constant,
+   Cval of formal f will have a constant value if all callsites to this
+   function have the same constant value passed to f.
+   Integer and real constants are represented as IPA_CONST_VALUE.  */
+enum ipa_lattice_type
+{
+  IPA_BOTTOM,
+  IPA_CONST_VALUE,
+  IPA_TOP
+};
+
 /* All formal parameters in the program have a cval computed by
    the interprocedural stage of IPCP. See enum ipa_lattice_type for
    the various types of lattices supported */
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 2d31000..17b9c512 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,12 @@
+2010-05-17  Martin Jambor  <mjambor@suse.cz>
+
+	* g++.dg/ipa/ivinline-1.C: New test.
+	* g++.dg/ipa/ivinline-2.C: New test.
+	* g++.dg/ipa/ivinline-3.C: New test.
+	* g++.dg/ipa/ivinline-4.C: New test.
+	* g++.dg/ipa/ivinline-5.C: New test.
+	* g++.dg/ipa/ivinline-6.C: New test.
+
 2010-05-17  Dodji Seketeli  <dodji@redhat.com>
 	    Jason Merrill  <jason@redhat.com>
 
diff --git a/gcc/testsuite/g++.dg/ipa/ivinline-1.C b/gcc/testsuite/g++.dg/ipa/ivinline-1.C
new file mode 100644
index 0000000..fc63e60
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/ivinline-1.C
@@ -0,0 +1,64 @@
+/* Verify that simple virtual calls are inlined even without early
+   inlining.  */
+/* { dg-do run } */
+/* { dg-options "-O3 -fdump-ipa-inline -fno-early-inlining -fno-ipa-cp"  } */
+
+extern "C" void abort (void);
+
+class A
+{
+public:
+  int data;
+  virtual int foo (int i);
+};
+
+class B : public A
+{
+public:
+  virtual int foo (int i);
+};
+
+class C : public A
+{
+public:
+  virtual int foo (int i);
+};
+
+int A::foo (int i)
+{
+  return i + 1;
+}
+
+int B::foo (int i)
+{
+  return i + 2;
+}
+
+int C::foo (int i)
+{
+  return i + 3;
+}
+
+int middleman (class A *obj, int i)
+{
+  return obj->foo (i);
+}
+
+int __attribute__ ((noinline,noclone)) get_input(void)
+{
+  return 1;
+}
+
+int main (int argc, char *argv[])
+{
+  class B b;
+  int i;
+
+  for (i = 0; i < get_input (); i++)
+    if (middleman (&b, get_input ()) != 3)
+      abort ();
+  return 0;
+}
+
+/* { dg-final { scan-ipa-dump "B::foo\[^\\n\]*inline copy in int main"  "inline"  } } */
+/* { dg-final { cleanup-ipa-dump "inline" } } */
diff --git a/gcc/testsuite/g++.dg/ipa/ivinline-2.C b/gcc/testsuite/g++.dg/ipa/ivinline-2.C
new file mode 100644
index 0000000..f993303
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/ivinline-2.C
@@ -0,0 +1,63 @@
+/* Verify that simple virtual calls using this pointer are inlined
+   even without early inlining..  */
+/* { dg-do run } */
+/* { dg-options "-O3 -fdump-ipa-inline -fno-early-inlining -fno-ipa-cp"  } */
+
+extern "C" void abort (void);
+
+class A
+{
+public:
+  int data;
+  virtual int foo (int i);
+  int middleman (int i)
+  {
+    return foo (i);
+  }
+};
+
+class B : public A
+{
+public:
+  virtual int foo (int i);
+};
+
+class C : public A
+{
+public:
+  virtual int foo (int i);
+};
+
+int A::foo (int i)
+{
+  return i + 1;
+}
+
+int B::foo (int i)
+{
+  return i + 2;
+}
+
+int C::foo (int i)
+{
+  return i + 3;
+}
+
+int __attribute__ ((noinline,noclone)) get_input(void)
+{
+  return 1;
+}
+
+int main (int argc, char *argv[])
+{
+  class B b;
+  int i;
+
+  for (i = 0; i < get_input (); i++)
+    if (b.middleman (get_input ()) != 3)
+      abort ();
+  return 0;
+}
+
+/* { dg-final { scan-ipa-dump "B::foo\[^\\n\]*inline copy in int main"  "inline"  } } */
+/* { dg-final { cleanup-ipa-dump "inline" } } */
diff --git a/gcc/testsuite/g++.dg/ipa/ivinline-3.C b/gcc/testsuite/g++.dg/ipa/ivinline-3.C
new file mode 100644
index 0000000..d9a47f8
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/ivinline-3.C
@@ -0,0 +1,64 @@
+/* Verify that simple virtual calls on an object refrence are inlined
+   even without early inlining.  */
+/* { dg-do run } */
+/* { dg-options "-O3 -fdump-ipa-inline -fno-early-inlining -fno-ipa-cp"  } */
+
+extern "C" void abort (void);
+
+class A
+{
+public:
+  int data;
+  virtual int foo (int i);
+};
+
+class B : public A
+{
+public:
+  virtual int foo (int i);
+};
+
+class C : public A
+{
+public:
+  virtual int foo (int i);
+};
+
+int A::foo (int i)
+{
+  return i + 1;
+}
+
+int B::foo (int i)
+{
+  return i + 2;
+}
+
+int C::foo (int i)
+{
+  return i + 3;
+}
+
+int middleman (class A &obj, int i)
+{
+  return obj.foo (i);
+}
+
+int __attribute__ ((noinline,noclone)) get_input(void)
+{
+  return 1;
+}
+
+int main (int argc, char *argv[])
+{
+  class B b;
+  int i;
+
+  for (i = 0; i < get_input (); i++)
+    if (middleman (b, get_input ()) != 3)
+      abort ();
+  return 0;
+}
+
+/* { dg-final { scan-ipa-dump "B::foo\[^\\n\]*inline copy in int main"  "inline"  } } */
+/* { dg-final { cleanup-ipa-dump "inline" } } */
diff --git a/gcc/testsuite/g++.dg/ipa/ivinline-4.C b/gcc/testsuite/g++.dg/ipa/ivinline-4.C
new file mode 100644
index 0000000..93cbe0c
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/ivinline-4.C
@@ -0,0 +1,70 @@
+/* Verify that simple virtual calls are inlined even without early
+   inlining, even when a typecast to an ancestor is involved along the
+   way.  */
+/* { dg-do run } */
+/* { dg-options "-O3 -fdump-ipa-inline -fno-early-inlining -fno-ipa-cp"  } */
+
+extern "C" void abort (void);
+
+class A
+{
+public:
+  int data;
+  virtual int foo (int i);
+};
+
+class B : public A
+{
+public:
+  virtual int foo (int i);
+};
+
+class C : public A
+{
+public:
+  virtual int foo (int i);
+};
+
+int A::foo (int i)
+{
+  return i + 1;
+}
+
+int B::foo (int i)
+{
+  return i + 2;
+}
+
+int C::foo (int i)
+{
+  return i + 3;
+}
+
+int __attribute__ ((noinline,noclone)) get_input(void)
+{
+  return 1;
+}
+
+static int middleman_1 (class A *obj, int i)
+{
+  return obj->foo (i);
+}
+
+static int middleman_2 (class B *obj, int i)
+{
+  return middleman_1 (obj, i);
+}
+
+int main (int argc, char *argv[])
+{
+  class B b;
+  int i;
+
+  for (i = 0; i < get_input (); i++)
+    if (middleman_2 (&b, get_input ()) != 3)
+      abort ();
+  return 0;
+}
+
+/* { dg-final { scan-ipa-dump "B::foo\[^\\n\]*inline copy in int main"  "inline"  } } */
+/* { dg-final { cleanup-ipa-dump "inline" } } */
diff --git a/gcc/testsuite/g++.dg/ipa/ivinline-5.C b/gcc/testsuite/g++.dg/ipa/ivinline-5.C
new file mode 100644
index 0000000..91e8f4e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/ivinline-5.C
@@ -0,0 +1,55 @@
+/* Verify that virtual call inlining does not pick a wrong method when
+   there is a user defined ancestor in an object.  */
+/* { dg-do run } */
+/* { dg-options "-O3 -fdump-ipa-inline -fno-early-inlining -fno-ipa-cp"  } */
+
+extern "C" void abort (void);
+
+class A
+{
+public:
+  int data;
+  virtual int foo (int i);
+};
+
+class B : public A
+{
+public:
+  class A confusion;
+  virtual int foo (int i);
+};
+
+int A::foo (int i)
+{
+  return i + 1;
+}
+
+int B::foo (int i)
+{
+  return i + 2;
+}
+
+int middleman (class A *obj, int i)
+{
+  return obj->foo (i);
+}
+
+int __attribute__ ((noinline,noclone)) get_input(void)
+{
+  return 1;
+}
+
+int main (int argc, char *argv[])
+{
+  class B b;
+  int i, j = get_input ();
+
+  for (i = 0; i < j; i++)
+    if ((middleman (&b, j) + 100 * middleman (&b.confusion, j)) != 203)
+      abort ();
+  return 0;
+}
+
+/* { dg-final { scan-ipa-dump "A::foo\[^\\n\]*inline copy in int main"  "inline"  } } */
+/* { dg-final { scan-ipa-dump "B::foo\[^\\n\]*inline copy in int main"  "inline"  } } */
+/* { dg-final { cleanup-ipa-dump "inline" } } */
diff --git a/gcc/testsuite/g++.dg/ipa/ivinline-6.C b/gcc/testsuite/g++.dg/ipa/ivinline-6.C
new file mode 100644
index 0000000..202e9e1
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/ivinline-6.C
@@ -0,0 +1,58 @@
+/* Verify that virtual call inlining works also when it has to get the
+   type from an ipa invariant and that even in this case it does not
+   pick a wrong method when there is a user defined ancestor in an
+   object.  */
+/* { dg-do run } */
+/* { dg-options "-O3 -fdump-ipa-inline -fno-early-inlining -fno-ipa-cp"  } */
+
+extern "C" void abort (void);
+
+class A
+{
+public:
+  int data;
+  virtual int foo (int i);
+};
+
+class B : public A
+{
+public:
+  class A confusion;
+  virtual int foo (int i);
+};
+
+int A::foo (int i)
+{
+  return i + 1;
+}
+
+int B::foo (int i)
+{
+  return i + 2;
+}
+
+int middleman (class A *obj, int i)
+{
+  return obj->foo (i);
+}
+
+int __attribute__ ((noinline,noclone)) get_input(void)
+{
+  return 1;
+}
+
+class B b;
+
+int main (int argc, char *argv[])
+{
+  int i, j = get_input ();
+
+  for (i = 0; i < j; i++)
+    if ((middleman (&b, j) + 100 * middleman (&b.confusion, j)) != 203)
+      abort ();
+  return 0;
+}
+
+/* { dg-final { scan-ipa-dump "A::foo\[^\\n\]*inline copy in int main"  "inline"  } } */
+/* { dg-final { scan-ipa-dump "B::foo\[^\\n\]*inline copy in int main"  "inline"  } } */
+/* { dg-final { cleanup-ipa-dump "inline" } } */
diff --git a/gcc/testsuite/g++.dg/ipa/ivinline-7.C b/gcc/testsuite/g++.dg/ipa/ivinline-7.C
new file mode 100644
index 0000000..5f3596d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ipa/ivinline-7.C
@@ -0,0 +1,79 @@
+/* Verify that simple virtual calls are inlined even without early
+   inlining, even when a typecast to an ancestor is involved along the
+   way and that ancestor is not the first one with virtual functions.  */
+/* { dg-do run } */
+/* { dg-options "-O3 -fdump-ipa-inline -fno-early-inlining -fno-ipa-cp"  } */
+
+extern "C" void abort (void);
+
+class Distraction
+{
+public:
+  float f;
+  double d;
+  Distraction ()
+  {
+    f = 8.3;
+    d = 10.2;
+  }
+  virtual float bar (float z);
+};
+
+class A
+{
+public:
+  int data;
+  virtual int foo (int i);
+};
+
+
+class B : public Distraction, public A
+{
+public:
+  virtual int foo (int i);
+};
+
+float Distraction::bar (float z)
+{
+  f += z;
+  return f/2;
+}
+
+int A::foo (int i)
+{
+  return i + 1;
+}
+
+int B::foo (int i)
+{
+  return i + 2;
+}
+
+int __attribute__ ((noinline,noclone)) get_input(void)
+{
+  return 1;
+}
+
+static int middleman_1 (class A *obj, int i)
+{
+  return obj->foo (i);
+}
+
+static int middleman_2 (class B *obj, int i)
+{
+  return middleman_1 (obj, i);
+}
+
+int main (int argc, char *argv[])
+{
+  class B b;
+  int i;
+
+  for (i = 0; i < get_input (); i++)
+    if (middleman_2 (&b, get_input ()) != 3)
+      abort ();
+  return 0;
+}
+
+/* { dg-final { scan-ipa-dump "B::foo\[^\\n\]*inline copy in int main"  "inline"  } } */
+/* { dg-final { cleanup-ipa-dump "inline" } } */
diff --git a/gcc/tree.c b/gcc/tree.c
index 8c0ed4e..f00f82e 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -10779,4 +10779,60 @@ lhd_gcc_personality (void)
   return gcc_eh_personality_decl;
 }
 
+/* Try to find a base info of BINFO that would have its field decl at offset
+   OFFSET within the BINFO type and which is of EXPECTED_TYPE.  If it can be
+   found, return, otherwise return NULL_TREE.  */
+
+tree
+get_binfo_at_offset (tree binfo, HOST_WIDE_INT offset, tree expected_type)
+{
+  tree type;
+
+  if (offset == 0)
+    return binfo;
+
+  type = TREE_TYPE (binfo);
+  while (offset > 0)
+    {
+      tree base_binfo, found_binfo;
+      HOST_WIDE_INT pos, size;
+      tree fld;
+      int i;
+
+      if (TREE_CODE (type) != RECORD_TYPE)
+	return NULL_TREE;
+
+      for (fld = TYPE_FIELDS (type); fld; fld = TREE_CHAIN (fld))
+	{
+	  if (TREE_CODE (fld) != FIELD_DECL)
+	    continue;
+
+	  pos = int_bit_position (fld);
+	  size = tree_low_cst (DECL_SIZE (fld), 1);
+	  if (pos <= offset && (pos + size) > offset)
+	    break;
+	}
+      if (!fld)
+	return NULL_TREE;
+
+      found_binfo = NULL_TREE;
+      for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
+	if (TREE_TYPE (base_binfo) == TREE_TYPE (fld))
+	  {
+	    found_binfo = base_binfo;
+	    break;
+	  }
+
+      if (!found_binfo)
+	return NULL_TREE;
+
+      type = TREE_TYPE (fld);
+      binfo = found_binfo;
+      offset -= pos;
+    }
+  if (type != expected_type)
+    return NULL_TREE;
+  return binfo;
+}
+
 #include "gt-tree.h"
diff --git a/gcc/tree.h b/gcc/tree.h
index 2b10d9a..5808827 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -5073,6 +5073,8 @@ extern location_t tree_nonartificial_location (tree);
 
 extern tree block_ultimate_origin (const_tree);
 
+extern tree get_binfo_at_offset (tree, HOST_WIDE_INT, tree);
+
 /* In tree-nested.c */
 extern tree build_addr (tree, tree);