diff --git a/gcc/ipa-cp.c b/gcc/ipa-cp.c
index 5b6cb9a..b770f6a 100644
--- a/gcc/ipa-cp.c
+++ b/gcc/ipa-cp.c
@@ -120,6 +120,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "params.h"
 #include "ipa-inline.h"
 #include "ipa-utils.h"
+#include "tree-ssa-ccp.h"
 
 template <typename valtype> class ipcp_value;
 
@@ -266,6 +267,40 @@ private:
   bool meet_with_1 (unsigned new_align, unsigned new_misalign);
 };
 
+/* Lattice of known bits, only capable of holding one value.
+   Similar to ccp_prop_value_t, mask represents which bits of value are constant.
+   If a bit in mask is set to 0, then the corresponding bit in
+   value is known to be constant.  */
+
+class ipcp_bits_lattice
+{
+public:
+  bool bottom_p () { return lattice_val == IPA_BITS_VARYING; }
+  bool top_p () { return lattice_val == IPA_BITS_UNDEFINED; }
+  bool constant_p () { return lattice_val == IPA_BITS_CONSTANT; }
+  bool set_to_bottom ();
+  bool set_to_constant (widest_int, widest_int, signop, unsigned);
+ 
+  widest_int get_value () { return value; }
+  widest_int get_mask () { return mask; }
+  signop get_sign () { return sgn; }
+  unsigned get_precision () { return precision; }
+
+  bool meet_with (ipcp_bits_lattice& other, enum tree_code, tree);
+  bool meet_with (widest_int, widest_int, signop, unsigned);
+
+  void print (FILE *);
+
+private:
+  enum { IPA_BITS_UNDEFINED, IPA_BITS_CONSTANT, IPA_BITS_VARYING } lattice_val;
+  widest_int value, mask;
+  signop sgn;
+  unsigned precision;
+
+  bool meet_with_1 (widest_int, widest_int); 
+  void get_value_and_mask (tree, widest_int *, widest_int *);
+}; 
+
 /* Structure containing lattices for a parameter itself and for pieces of
    aggregates that are passed in the parameter or by a reference in a parameter
    plus some other useful flags.  */
@@ -281,6 +316,8 @@ public:
   ipcp_agg_lattice *aggs;
   /* Lattice describing known alignment.  */
   ipcp_alignment_lattice alignment;
+  /* Lattice describing known bits.  */
+  ipcp_bits_lattice bits_lattice;
   /* Number of aggregate lattices */
   int aggs_count;
   /* True if aggregate data were passed by reference (as opposed to by
@@ -458,6 +495,21 @@ ipcp_alignment_lattice::print (FILE * f)
     fprintf (f, "         Alignment %u, misalignment %u\n", align, misalign);
 }
 
+void
+ipcp_bits_lattice::print (FILE *f)
+{
+  if (top_p ())
+    fprintf (f, "         Bits unknown (TOP)\n");
+  else if (bottom_p ())
+    fprintf (f, "         Bits unusable (BOTTOM)\n");
+  else
+    {
+      fprintf (f, "         Bits: value = "); print_hex (get_value (), f);
+      fprintf (f, ", mask = "); print_hex (get_mask (), f);
+      fprintf (f, "\n");
+    }
+}
+
 /* Print all ipcp_lattices of all functions to F.  */
 
 static void
@@ -484,6 +536,7 @@ print_all_lattices (FILE * f, bool dump_sources, bool dump_benefits)
 	  fprintf (f, "         ctxs: ");
 	  plats->ctxlat.print (f, dump_sources, dump_benefits);
 	  plats->alignment.print (f);
+	  plats->bits_lattice.print (f);
 	  if (plats->virt_call)
 	    fprintf (f, "        virt_call flag set\n");
 
@@ -911,6 +964,161 @@ ipcp_alignment_lattice::meet_with (const ipcp_alignment_lattice &other,
   return meet_with_1 (other.align, adjusted_misalign);
 }
 
+/* Set lattice value to bottom, if it already isn't the case.  */
+
+bool
+ipcp_bits_lattice::set_to_bottom ()
+{
+  if (bottom_p ())
+    return false;
+  lattice_val = IPA_BITS_VARYING;
+  value = 0;
+  mask = -1;
+  return true;
+}
+
+/* Set to constant if it isn't already. Only meant to be called
+   when switching state from TOP.  */
+
+bool
+ipcp_bits_lattice::set_to_constant (widest_int value, widest_int mask,
+				    signop sgn, unsigned precision)
+{
+  gcc_assert (top_p ());
+  this->lattice_val = IPA_BITS_CONSTANT;
+  this->value = value;
+  this->mask = mask;
+  this->sgn = sgn;
+  this->precision = precision;
+  return true;
+}
+
+/* Convert operand to value, mask form.  */
+
+void
+ipcp_bits_lattice::get_value_and_mask (tree operand, widest_int *valuep, widest_int *maskp)
+{
+  wide_int get_nonzero_bits (const_tree);
+
+  if (TREE_CODE (operand) == INTEGER_CST)
+    {
+      *valuep = wi::to_widest (operand); 
+      *maskp = 0;
+    }
+  else if (TREE_CODE (operand) == SSA_NAME)
+    {
+      *valuep = 0;
+      *maskp = widest_int::from (get_nonzero_bits (operand), UNSIGNED);
+    }
+  else
+    gcc_unreachable ();
+}  
+
+/* Meet operation, similar to ccp_lattice_meet, we xor values
+   if this->value, value have different values at same bit positions, we want
+   to drop that bit to varying. Return true if mask is changed.
+   This function assumes that the lattice value is in CONSTANT state  */
+
+bool
+ipcp_bits_lattice::meet_with_1 (widest_int value, widest_int mask)
+{
+  gcc_assert (constant_p ());
+  
+  widest_int old_mask = this->mask;
+  this->mask = (this->mask | mask) | (this->value ^ value);
+
+  if (wi::sext (this->mask, this->precision) == -1)
+    return set_to_bottom ();
+
+  bool changed = this->mask != old_mask;
+  return changed;
+}
+
+/* Meet the bits lattice with operand
+   described by <value, mask, sgn, precision.  */
+
+bool
+ipcp_bits_lattice::meet_with (widest_int value, widest_int mask,
+			      signop sgn, unsigned precision)
+{
+  if (bottom_p ())
+    return false;
+
+  if (top_p ())
+    {
+      if (wi::sext (mask, precision) == -1)
+	return set_to_bottom ();
+      return set_to_constant (value, mask, sgn, precision);
+    }
+
+  return meet_with_1 (value, mask);
+}
+
+/* Meet bits lattice with the result of bit_value_binop_1 (other, operand)
+   if code is binary operation or bit_value_unop_1 (other) if code is unary op.
+   In the case when code is nop_expr, no adjustment is required. */
+
+bool
+ipcp_bits_lattice::meet_with (ipcp_bits_lattice& other, enum tree_code code, tree operand)
+{
+  if (other.bottom_p ())
+    return set_to_bottom ();
+
+  if (bottom_p () || other.top_p ())
+    return false;
+
+  widest_int adjusted_value, adjusted_mask;
+
+  if (TREE_CODE_CLASS (code) == tcc_binary)
+    {
+      tree type = TREE_TYPE (operand);
+      gcc_assert (INTEGRAL_TYPE_P (type));
+      widest_int o_value, o_mask;
+      get_value_and_mask (operand, &o_value, &o_mask);
+
+      signop sgn = other.get_sign ();
+      unsigned prec = other.get_precision ();
+
+      bit_value_binop_1 (code, sgn, prec, &adjusted_value, &adjusted_mask,
+			 sgn, prec, other.get_value (), other.get_mask (),
+			 TYPE_SIGN (type), TYPE_PRECISION (type), o_value, o_mask);
+
+      if (wi::sext (adjusted_mask, prec) == -1)
+	return set_to_bottom ();
+    }
+
+  else if (TREE_CODE_CLASS (code) == tcc_unary)
+    {
+      signop sgn = other.get_sign ();
+      unsigned prec = other.get_precision ();
+
+      bit_value_unop_1 (code, sgn, prec, &adjusted_value,
+			&adjusted_mask, sgn, prec, other.get_value (),
+			other.get_mask ());
+
+      if (wi::sext (adjusted_mask, prec) == -1)
+	return set_to_bottom ();
+    }
+
+  else if (code == NOP_EXPR)
+    {
+      adjusted_value = other.value;
+      adjusted_mask = other.mask;
+    }
+
+  else
+    return set_to_bottom ();
+
+  if (top_p ())
+    {
+      if (wi::sext (adjusted_mask, other.get_precision ()) == -1)
+	return set_to_bottom ();
+      return set_to_constant (adjusted_value, adjusted_mask, other.get_sign (), other.get_precision ());
+    }
+  else
+    return meet_with_1 (adjusted_value, adjusted_mask);
+}
+
 /* Mark bot aggregate and scalar lattices as containing an unknown variable,
    return true is any of them has not been marked as such so far.  */
 
@@ -922,6 +1130,7 @@ set_all_contains_variable (struct ipcp_param_lattices *plats)
   ret |= plats->ctxlat.set_contains_variable ();
   ret |= set_agg_lats_contain_variable (plats);
   ret |= plats->alignment.set_to_bottom ();
+  ret |= plats->bits_lattice.set_to_bottom ();
   return ret;
 }
 
@@ -1003,6 +1212,7 @@ initialize_node_lattices (struct cgraph_node *node)
 	      plats->ctxlat.set_to_bottom ();
 	      set_agg_lats_to_bottom (plats);
 	      plats->alignment.set_to_bottom ();
+	      plats->bits_lattice.set_to_bottom ();
 	    }
 	  else
 	    set_all_contains_variable (plats);
@@ -1621,6 +1831,57 @@ propagate_alignment_accross_jump_function (cgraph_edge *cs,
     }
 }
 
+/* Propagate bits across jfunc that is associated with
+   edge cs and update dest_lattice accordingly.  */
+
+bool
+propagate_bits_accross_jump_function (cgraph_edge *cs, ipa_jump_func *jfunc,
+				      ipcp_bits_lattice *dest_lattice)
+{
+  if (dest_lattice->bottom_p ())
+    return false;
+
+  if (jfunc->type == IPA_JF_PASS_THROUGH)
+    {
+      struct ipa_node_params *caller_info = IPA_NODE_REF (cs->caller);
+      enum tree_code code = ipa_get_jf_pass_through_operation (jfunc);
+      tree operand = NULL_TREE;
+
+      if (code != NOP_EXPR)
+	operand = ipa_get_jf_pass_through_operand (jfunc);
+
+      int src_idx = ipa_get_jf_pass_through_formal_id (jfunc);
+      struct ipcp_param_lattices *src_lats
+	= ipa_get_parm_lattices (caller_info, src_idx);
+
+      /* Try to proapgate bits if src_lattice is bottom, but jfunc is known.
+	 for eg consider:
+	 int f(int x)
+	 {
+	   g (x & 0xff);
+	 }
+	 Assume lattice for x is bottom, however we can still propagate
+	 result of x & 0xff == 0xff, which gets computed during ccp1 pass
+	 and we store it in jump function during analysis stage.  */
+
+      if (src_lats->bits_lattice.bottom_p ()
+	  && jfunc->bits.known)
+	return dest_lattice->meet_with (jfunc->bits.value, jfunc->bits.mask,
+				        jfunc->bits.sgn, jfunc->bits.precision);
+      else
+	return dest_lattice->meet_with (src_lats->bits_lattice, code, operand);
+    }
+
+  else if (jfunc->type == IPA_JF_ANCESTOR)
+    return dest_lattice->set_to_bottom ();
+
+  else if (jfunc->bits.known) 
+    return dest_lattice->meet_with (jfunc->bits.value, jfunc->bits.mask,
+				    jfunc->bits.sgn, jfunc->bits.precision);
+  else
+    return dest_lattice->set_to_bottom ();
+}
+
 /* If DEST_PLATS already has aggregate items, check that aggs_by_ref matches
    NEW_AGGS_BY_REF and if not, mark all aggs as bottoms and return true (in all
    other cases, return false).  If there are no aggregate items, set
@@ -1968,6 +2229,8 @@ propagate_constants_accross_call (struct cgraph_edge *cs)
 							  &dest_plats->ctxlat);
 	  ret |= propagate_alignment_accross_jump_function (cs, jump_func,
 							 &dest_plats->alignment);
+	  ret |= propagate_bits_accross_jump_function (cs, jump_func,
+						       &dest_plats->bits_lattice);
 	  ret |= propagate_aggs_accross_jump_function (cs, jump_func,
 						       dest_plats);
 	}
@@ -4592,6 +4855,74 @@ ipcp_store_alignment_results (void)
   }
 }
 
+/* Look up all the bits information that we have discovered and copy it over
+   to the transformation summary.  */
+
+static void
+ipcp_store_bits_results (void)
+{
+  cgraph_node *node;
+
+  FOR_EACH_FUNCTION_WITH_GIMPLE_BODY (node)
+    {
+      ipa_node_params *info = IPA_NODE_REF (node);
+      bool dumped_sth = false;
+      bool found_useful_result = false;
+
+      if (info->ipcp_orig_node)
+	info = IPA_NODE_REF (info->ipcp_orig_node);
+
+      unsigned count = ipa_get_param_count (info);
+      for (unsigned i = 0; i < count; i++)
+	{
+	  ipcp_param_lattices *plats = ipa_get_parm_lattices (info, i);
+	  if (plats->bits_lattice.constant_p ())
+	    {
+	      found_useful_result = true;
+	      break;
+	    }
+	}
+
+    if (!found_useful_result)
+      continue;
+
+    ipcp_grow_transformations_if_necessary ();
+    ipcp_transformation_summary *ts = ipcp_get_transformation_summary (node);
+    vec_safe_reserve_exact (ts->bits, count);
+
+    for (unsigned i = 0; i < count; i++)
+      {
+	ipcp_param_lattices *plats = ipa_get_parm_lattices (info, i);
+	ipa_bits bits_jfunc;			 
+
+	if (plats->bits_lattice.constant_p ())
+	  {
+	    bits_jfunc.known = true;
+	    bits_jfunc.value = plats->bits_lattice.get_value ();
+	    bits_jfunc.mask = plats->bits_lattice.get_mask ();
+	    bits_jfunc.sgn = plats->bits_lattice.get_sign ();
+	    bits_jfunc.precision = plats->bits_lattice.get_precision ();
+	  }
+	else
+	  bits_jfunc.known = false;
+
+	ts->bits->quick_push (bits_jfunc);
+	if (!dump_file || !bits_jfunc.known)
+	  continue;
+	if (!dumped_sth)
+	  {
+	    fprintf (dump_file, "Propagated bits info for function %s/%i:\n",
+				node->name (), node->order);
+	    dumped_sth = true;
+	  }
+	fprintf (dump_file, " param %i: value = ", i);
+	print_hex (bits_jfunc.value, dump_file);
+	fprintf (dump_file, ", mask = ");
+	print_hex (bits_jfunc.mask, dump_file);
+	fprintf (dump_file, "\n");
+      }
+    }
+}
 /* The IPCP driver.  */
 
 static unsigned int
@@ -4625,6 +4956,8 @@ ipcp_driver (void)
   ipcp_decision_stage (&topo);
   /* Store results of alignment propagation. */
   ipcp_store_alignment_results ();
+  /* Store results of bits propagation.  */
+  ipcp_store_bits_results ();
 
   /* Free all IPCP structures.  */
   free_toporder_info (&topo);
diff --git a/gcc/ipa-prop.c b/gcc/ipa-prop.c
index 132b622..0913cc5 100644
--- a/gcc/ipa-prop.c
+++ b/gcc/ipa-prop.c
@@ -302,6 +302,15 @@ ipa_print_node_jump_functions_for_edge (FILE *f, struct cgraph_edge *cs)
 	}
       else
 	fprintf (f, "         Unknown alignment\n");
+
+      if (jump_func->bits.known)
+	{
+	  fprintf (f, "         value: "); print_hex (jump_func->bits.value, f);
+	  fprintf (f, ", mask: "); print_hex (jump_func->bits.mask, f);
+	  fprintf (f, "\n");
+	}
+      else
+	fprintf (f, "         Unknown bits\n");
     }
 }
 
@@ -381,6 +390,7 @@ ipa_set_jf_unknown (struct ipa_jump_func *jfunc)
 {
   jfunc->type = IPA_JF_UNKNOWN;
   jfunc->alignment.known = false;
+  jfunc->bits.known = false;
 }
 
 /* Set JFUNC to be a copy of another jmp (to be used by jump function
@@ -1674,6 +1684,27 @@ ipa_compute_jump_functions_for_edge (struct ipa_func_body_info *fbi,
       else
 	gcc_assert (!jfunc->alignment.known);
 
+      if (INTEGRAL_TYPE_P (TREE_TYPE (arg))
+	  && (TREE_CODE (arg) == SSA_NAME || TREE_CODE (arg) == INTEGER_CST))
+	{
+	  jfunc->bits.known = true;
+	  jfunc->bits.sgn = TYPE_SIGN (TREE_TYPE (arg));
+	  jfunc->bits.precision = TYPE_PRECISION (TREE_TYPE (arg));
+	  
+	  if (TREE_CODE (arg) == SSA_NAME)
+	    {
+	      jfunc->bits.value = 0;
+	      jfunc->bits.mask = widest_int::from (get_nonzero_bits (arg), UNSIGNED); 
+	    }
+	  else
+	    {
+	      jfunc->bits.value = wi::to_widest (arg);
+	      jfunc->bits.mask = 0;
+	    }
+	}
+      else
+	gcc_assert (!jfunc->bits.known);
+
       if (is_gimple_ip_invariant (arg)
 	  || (TREE_CODE (arg) == VAR_DECL
 	      && is_global_var (arg)
@@ -3690,6 +3721,18 @@ ipa_node_params_t::duplicate(cgraph_node *src, cgraph_node *dst,
       for (unsigned i = 0; i < src_alignments->length (); ++i)
 	dst_alignments->quick_push ((*src_alignments)[i]);
     }
+
+  if (src_trans && vec_safe_length (src_trans->bits) > 0)
+    {
+      ipcp_grow_transformations_if_necessary ();
+      src_trans = ipcp_get_transformation_summary (src);
+      const vec<ipa_bits, va_gc> *src_bits = src_trans->bits;
+      vec<ipa_bits, va_gc> *&dst_bits
+	= ipcp_get_transformation_summary (dst)->bits;
+      vec_safe_reserve_exact (dst_bits, src_bits->length ());
+      for (unsigned i = 0; i < src_bits->length (); ++i)
+	dst_bits->quick_push ((*src_bits)[i]);
+    }
 }
 
 /* Register our cgraph hooks if they are not already there.  */
@@ -4609,6 +4652,17 @@ ipa_write_jump_function (struct output_block *ob,
       streamer_write_uhwi (ob, jump_func->alignment.align);
       streamer_write_uhwi (ob, jump_func->alignment.misalign);
     }
+
+  bp = bitpack_create (ob->main_stream);
+  bp_pack_value (&bp, jump_func->bits.known, 1);
+  streamer_write_bitpack (&bp);
+  if (jump_func->bits.known)
+    {
+      streamer_write_wi (ob, jump_func->bits.value);
+      streamer_write_wi (ob, jump_func->bits.mask);
+      streamer_write_enum (ob->main_stream, signop, UNSIGNED + 1, jump_func->bits.sgn);
+      streamer_write_uhwi (ob, jump_func->bits.precision);
+    }   
 }
 
 /* Read in jump function JUMP_FUNC from IB.  */
@@ -4685,6 +4739,19 @@ ipa_read_jump_function (struct lto_input_block *ib,
     }
   else
     jump_func->alignment.known = false;
+
+  bp = streamer_read_bitpack (ib);
+  bool bits_known = bp_unpack_value (&bp, 1);
+  if (bits_known)
+    {
+      jump_func->bits.known = true;
+      jump_func->bits.value = streamer_read_wi (ib);
+      jump_func->bits.mask = streamer_read_wi (ib);
+      jump_func->bits.sgn = streamer_read_enum (ib, signop, UNSIGNED + 1);
+      jump_func->bits.precision = streamer_read_uhwi (ib); 
+    }
+  else
+    jump_func->bits.known = false;
 }
 
 /* Stream out parts of cgraph_indirect_call_info corresponding to CS that are
@@ -5050,6 +5117,31 @@ write_ipcp_transformation_info (output_block *ob, cgraph_node *node)
     }
   else
     streamer_write_uhwi (ob, 0);
+
+  ts = ipcp_get_transformation_summary (node);
+  if (ts && vec_safe_length (ts->bits) > 0)
+    {
+      count = ts->bits->length ();
+      streamer_write_uhwi (ob, count);
+
+      for (unsigned i = 0; i < count; ++i)
+	{
+	  const ipa_bits& bits_jfunc = (*ts->bits)[i];
+	  struct bitpack_d bp = bitpack_create (ob->main_stream);
+	  bp_pack_value (&bp, bits_jfunc.known, 1);
+	  streamer_write_bitpack (&bp);
+	  if (bits_jfunc.known)
+	    {
+	      streamer_write_wi (ob, bits_jfunc.value);
+	      streamer_write_wi (ob, bits_jfunc.mask);
+	      streamer_write_enum (ob->main_stream, signop,
+				   UNSIGNED + 1, bits_jfunc.sgn);
+	      streamer_write_uhwi (ob, bits_jfunc.precision);
+	    }
+	}
+    }
+  else
+    streamer_write_uhwi (ob, 0);
 }
 
 /* Stream in the aggregate value replacement chain for NODE from IB.  */
@@ -5102,6 +5194,28 @@ read_ipcp_transformation_info (lto_input_block *ib, cgraph_node *node,
 	    }
 	}
     }
+
+  count = streamer_read_uhwi (ib);
+  if (count > 0)
+    {
+      ipcp_grow_transformations_if_necessary ();
+      ipcp_transformation_summary *ts = ipcp_get_transformation_summary (node);
+      vec_safe_grow_cleared (ts->bits, count);
+
+      for (i = 0; i < count; i++)
+	{
+	  ipa_bits& bits_jfunc = (*ts->bits)[i];
+	  struct bitpack_d bp = streamer_read_bitpack (ib);
+	  bits_jfunc.known = bp_unpack_value (&bp, 1);
+	  if (bits_jfunc.known)
+	    {
+	      bits_jfunc.value = streamer_read_wi (ib);
+	      bits_jfunc.mask = streamer_read_wi (ib);
+	      bits_jfunc.sgn = streamer_read_enum (ib, signop, UNSIGNED + 1);
+	      bits_jfunc.precision = streamer_read_uhwi (ib);
+	    }
+	}
+    }
 }
 
 /* Write all aggregate replacement for nodes in set.  */
@@ -5404,6 +5518,55 @@ ipcp_update_alignments (struct cgraph_node *node)
     }
 }
 
+/* Update bits info of formal parameters as described in
+   ipcp_transformation_summary.  */
+
+static void
+ipcp_update_bits (struct cgraph_node *node)
+{
+  tree parm = DECL_ARGUMENTS (node->decl);
+  tree next_parm = parm;
+  ipcp_transformation_summary *ts = ipcp_get_transformation_summary (node);
+
+  if (!ts || vec_safe_length (ts->bits) == 0)
+    return;
+
+  vec<ipa_bits, va_gc> &bits = *ts->bits;
+  unsigned count = bits.length ();
+
+  for (unsigned i = 0; i < count; ++i, parm = next_parm)
+    {
+      if (node->clone.combined_args_to_skip
+	  && bitmap_bit_p (node->clone.combined_args_to_skip, i))
+	continue;
+
+      gcc_checking_assert (parm);
+      next_parm = DECL_CHAIN (parm);
+
+      if (!bits[i].known
+	  || !INTEGRAL_TYPE_P (TREE_TYPE (parm))
+	  || !is_gimple_reg (parm))
+	continue;       
+
+      tree ddef = ssa_default_def (DECL_STRUCT_FUNCTION (node->decl), parm);
+      if (!ddef)
+	continue;
+
+      if (dump_file)
+	{
+	  fprintf (dump_file, "Adjusting mask for param %u to ", i); 
+	  print_hex (bits[i].mask, dump_file);
+	  fprintf (dump_file, "\n");
+	}
+
+      unsigned prec = TYPE_PRECISION (TREE_TYPE (ddef));
+      wide_int nonzero_bits = wide_int::from (bits[i].mask, prec, UNSIGNED)
+			      | wide_int::from (bits[i].value, prec, bits[i].sgn);
+      set_nonzero_bits (ddef, nonzero_bits);
+      DECL_SET_BY_IPA (parm) = 1;
+    }
+}
+
 /* IPCP transformation phase doing propagation of aggregate values.  */
 
 unsigned int
@@ -5423,6 +5586,7 @@ ipcp_transform_function (struct cgraph_node *node)
 	     node->name (), node->order);
 
   ipcp_update_alignments (node);
+  ipcp_update_bits (node);
   aggval = ipa_get_agg_replacements_for_node (node);
   if (!aggval)
       return 0;
diff --git a/gcc/ipa-prop.h b/gcc/ipa-prop.h
index e32d078..d69a071 100644
--- a/gcc/ipa-prop.h
+++ b/gcc/ipa-prop.h
@@ -154,6 +154,16 @@ struct GTY(()) ipa_alignment
   unsigned misalign;
 };
 
+/* Information about zero/non-zero bits.  */
+struct GTY(()) ipa_bits
+{
+  bool known;
+  widest_int value;
+  widest_int mask;
+  enum signop sgn;
+  unsigned precision;
+};
+
 /* A jump function for a callsite represents the values passed as actual
    arguments of the callsite. See enum jump_func_type for the various
    types of jump functions supported.  */
@@ -166,6 +176,9 @@ struct GTY (()) ipa_jump_func
   /* Information about alignment of pointers. */
   struct ipa_alignment alignment;
 
+  /* Information about zero/non-zero bits.  */
+  struct ipa_bits bits;
+
   enum jump_func_type type;
   /* Represents a value of a jump function.  pass_through is used only in jump
      function context.  constant represents the actual constant in constant jump
@@ -482,6 +495,8 @@ struct GTY(()) ipcp_transformation_summary
   ipa_agg_replacement_value *agg_values;
   /* Alignment information for pointers.  */
   vec<ipa_alignment, va_gc> *alignments;
+  /* Known bits information.  */
+  vec<ipa_bits, va_gc> *bits;
 };
 
 void ipa_set_node_agg_value_chain (struct cgraph_node *node,
diff --git a/gcc/lto-streamer-in.c b/gcc/lto-streamer-in.c
index 1d56d21..01462e2 100644
--- a/gcc/lto-streamer-in.c
+++ b/gcc/lto-streamer-in.c
@@ -712,7 +712,7 @@ make_new_block (struct function *fn, unsigned int index)
 
 /* Read a wide-int.  */
 
-static widest_int
+widest_int
 streamer_read_wi (struct lto_input_block *ib)
 {
   HOST_WIDE_INT a[WIDE_INT_MAX_ELTS];
diff --git a/gcc/lto-streamer-out.c b/gcc/lto-streamer-out.c
index aa6b589..8fbd882 100644
--- a/gcc/lto-streamer-out.c
+++ b/gcc/lto-streamer-out.c
@@ -1830,7 +1830,7 @@ output_ssa_names (struct output_block *ob, struct function *fn)
 
 /* Output a wide-int.  */
 
-static void
+void
 streamer_write_wi (struct output_block *ob,
 		   const widest_int &w)
 {
diff --git a/gcc/lto-streamer.h b/gcc/lto-streamer.h
index ecc1e5d..4da89d0 100644
--- a/gcc/lto-streamer.h
+++ b/gcc/lto-streamer.h
@@ -1225,4 +1225,7 @@ DEFINE_DECL_STREAM_FUNCS (TYPE_DECL, type_decl)
 DEFINE_DECL_STREAM_FUNCS (NAMESPACE_DECL, namespace_decl)
 DEFINE_DECL_STREAM_FUNCS (LABEL_DECL, label_decl)
 
+widest_int streamer_read_wi (struct lto_input_block *);
+void streamer_write_wi (struct output_block *, const widest_int &);
+
 #endif /* GCC_LTO_STREAMER_H  */
diff --git a/gcc/testsuite/gcc.dg/ipa/prop-bits-1.c b/gcc/testsuite/gcc.dg/ipa/prop-bits-1.c
new file mode 100644
index 0000000..2389d9f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ipa/prop-bits-1.c
@@ -0,0 +1,33 @@
+/* Propagate 0xff from main to f3 to f2.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-early-inlining -fdump-ipa-cp -fdump-tree-optimized" } */
+
+int pass_test(void);
+int fail_test(void);
+
+__attribute__((noinline, noclone))
+static int f2(int x)
+{
+  if (x > 300)
+    return fail_test();
+  else
+    return pass_test();
+}
+
+__attribute__((noinline, noclone))
+static int f3(int y)
+{
+  int k = f2(y);
+  return k;
+}
+
+int main(int argc)
+{
+  int k = argc & 0xff;
+  int a = f3(k);
+  return a; 
+}
+
+/* { dg-final { scan-ipa-dump-times "Adjusting mask for param 0 to 0xff" 2 "cp" } } */
+/* { dg-final { scan-tree-dump-not "fail_test" "optimized" } } */
diff --git a/gcc/testsuite/gcc.dg/ipa/prop-bits-2.c b/gcc/testsuite/gcc.dg/ipa/prop-bits-2.c
new file mode 100644
index 0000000..8704cce
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ipa/prop-bits-2.c
@@ -0,0 +1,37 @@
+/* x's mask should be meet(0xc, 0x3) == 0xf  */
+
+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-early-inlining -fdump-ipa-cp" } */
+
+__attribute__((noinline))
+static int f1(int x)
+{
+  if (x > 300)
+    return 1;
+  else
+    return 2;
+}
+
+__attribute__((noinline))
+static int f2(int y)
+{
+  return f1(y & 0x03);
+}
+
+__attribute__((noinline))
+static int f3(int z)
+{
+  return f1(z & 0xc);
+}
+
+extern int a;
+extern int b;
+
+int main(void)
+{
+  int k = f2(a); 
+  int l = f3(b);
+  return k + l;
+}
+
+/* { dg-final { scan-ipa-dump "Adjusting mask for param 0 to 0xf" "cp" } } */
diff --git a/gcc/testsuite/gcc.dg/ipa/prop-bits-3.c b/gcc/testsuite/gcc.dg/ipa/prop-bits-3.c
new file mode 100644
index 0000000..1d0a2ab
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ipa/prop-bits-3.c
@@ -0,0 +1,24 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-early-inlining -fdump-ipa-cp" } */
+
+__attribute__((noinline))
+static int f(int x)
+{
+  int f2(int);
+
+  if (x > 300)
+    {
+      int z = f(x + 1);
+      return f2 (z);
+    }
+  else
+    return 2;
+}
+
+int main(int argc, char **argv)
+{
+  int k = f(argc & 0xff); 
+  return k;
+}
+
+/* { dg-final { scan-ipa-dump-not "Adjusting mask for" "cp" } } */  
diff --git a/gcc/testsuite/gcc.dg/ipa/prop-bits-4.c b/gcc/testsuite/gcc.dg/ipa/prop-bits-4.c
new file mode 100644
index 0000000..135cde9
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ipa/prop-bits-4.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-early-inlining -fdump-ipa-cp" } */
+
+__attribute__((noinline)) 
+static int f(int x)
+{
+  if (x > 300)
+    return 1;
+  else
+    return 2;
+}
+
+int main(void)
+{
+  int a = f(1);
+  int b = f(2);
+  int c = f(4);
+  return a + b + c;
+}
+
+/* { dg-final { scan-ipa-dump "Adjusting mask for param 0 to 0x7" "cp" } } */
diff --git a/gcc/testsuite/gcc.dg/ipa/prop-bits-5.c b/gcc/testsuite/gcc.dg/ipa/prop-bits-5.c
new file mode 100644
index 0000000..731f307
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ipa/prop-bits-5.c
@@ -0,0 +1,26 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-early-inlining -fdump-ipa-cp" } */
+
+__attribute__((noinline))
+static int f1(int x)
+{
+  if (x > 20)
+    return 1;
+  else
+    return 2;
+}
+
+__attribute__((noinline))
+static int f2(int y)
+{
+  return f1 (y & 0x3);
+}
+
+int main(int argc, char **argv)
+{
+  int z = f2 (argc & 0xff);
+  int k = f1 (argc & 0xc);
+  return z + k;
+}
+
+/* { dg-final { scan-ipa-dump "Adjusting mask for param 0 to 0xf" "cp" } } */
diff --git a/gcc/tree-core.h b/gcc/tree-core.h
index 6e8595c..9369cf7 100644
--- a/gcc/tree-core.h
+++ b/gcc/tree-core.h
@@ -1558,7 +1558,8 @@ struct GTY(()) tree_decl_common {
   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
   unsigned int align : 6;
 
-  /* 20 bits unused.  */
+  unsigned set_by_ipa: 1;
+  /* 19 bits unused.  */
 
   /* UID for points-to sets, stable over copying from inlining.  */
   unsigned int pt_uid;
diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c
index ae120a8..c75e9ce 100644
--- a/gcc/tree-ssa-ccp.c
+++ b/gcc/tree-ssa-ccp.c
@@ -142,7 +142,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "cfgloop.h"
 #include "stor-layout.h"
 #include "optabs-query.h"
-
+#include "tree-ssa-ccp.h"
 
 /* Possible lattice values.  */
 typedef enum
@@ -287,7 +287,11 @@ get_default_value (tree var)
 		{
 		  val.lattice_val = CONSTANT;
 		  val.value = build_zero_cst (TREE_TYPE (var));
-		  val.mask = extend_mask (nonzero_bits);
+		  if (SSA_NAME_VAR (var) && TREE_CODE (SSA_NAME_VAR (var)) == PARM_DECL
+		      && DECL_SET_BY_IPA (SSA_NAME_VAR (var)))
+		    val.mask = widest_int::from (nonzero_bits, TYPE_SIGN (TREE_TYPE (SSA_NAME_VAR (var))));
+		  else
+		    val.mask = extend_mask (nonzero_bits);
 		}
 	    }
 	}
@@ -537,9 +541,9 @@ set_lattice_value (tree var, ccp_prop_value_t *new_val)
 
 static ccp_prop_value_t get_value_for_expr (tree, bool);
 static ccp_prop_value_t bit_value_binop (enum tree_code, tree, tree, tree);
-static void bit_value_binop_1 (enum tree_code, tree, widest_int *, widest_int *,
-			       tree, const widest_int &, const widest_int &,
-			       tree, const widest_int &, const widest_int &);
+void bit_value_binop_1 (enum tree_code, signop, unsigned, widest_int *, widest_int *,
+			signop, unsigned, const widest_int &, const widest_int &,
+			signop, unsigned, const widest_int &, const widest_int &);
 
 /* Return a widest_int that can be used for bitwise simplifications
    from VAL.  */
@@ -895,7 +899,7 @@ do_dbg_cnt (void)
    Return TRUE when something was optimized.  */
 
 static bool
-ccp_finalize (bool nonzero_p)
+ccp_finalize (bool nonzero_p ATTRIBUTE_UNUSED)
 {
   bool something_changed;
   unsigned i;
@@ -913,10 +917,7 @@ ccp_finalize (bool nonzero_p)
 
       if (!name
 	  || (!POINTER_TYPE_P (TREE_TYPE (name))
-	      && (!INTEGRAL_TYPE_P (TREE_TYPE (name))
-		  /* Don't record nonzero bits before IPA to avoid
-		     using too much memory.  */
-		  || !nonzero_p)))
+	      && (!INTEGRAL_TYPE_P (TREE_TYPE (name)))))
 	continue;
 
       val = get_value (name);
@@ -1225,10 +1226,11 @@ ccp_fold (gimple *stmt)
    RVAL and RMASK representing a value of type RTYPE and set
    the value, mask pair *VAL and *MASK to the result.  */
 
-static void
-bit_value_unop_1 (enum tree_code code, tree type,
+void
+bit_value_unop_1 (enum tree_code code, signop type_sgn, unsigned type_precision, 
 		  widest_int *val, widest_int *mask,
-		  tree rtype, const widest_int &rval, const widest_int &rmask)
+		  signop rtype_sgn, unsigned rtype_precision,
+		  const widest_int &rval, const widest_int &rmask)
 {
   switch (code)
     {
@@ -1241,25 +1243,23 @@ bit_value_unop_1 (enum tree_code code, tree type,
       {
 	widest_int temv, temm;
 	/* Return ~rval + 1.  */
-	bit_value_unop_1 (BIT_NOT_EXPR, type, &temv, &temm, type, rval, rmask);
-	bit_value_binop_1 (PLUS_EXPR, type, val, mask,
-			   type, temv, temm, type, 1, 0);
+	bit_value_unop_1 (BIT_NOT_EXPR, type_sgn, type_precision, &temv, &temm,
+			  type_sgn, type_precision, rval, rmask);
+	bit_value_binop_1 (PLUS_EXPR, type_sgn, type_precision, val, mask,
+			   type_sgn, type_precision, temv, temm,
+			   type_sgn, type_precision, 1, 0);
 	break;
       }
 
     CASE_CONVERT:
       {
-	signop sgn;
-
 	/* First extend mask and value according to the original type.  */
-	sgn = TYPE_SIGN (rtype);
-	*mask = wi::ext (rmask, TYPE_PRECISION (rtype), sgn);
-	*val = wi::ext (rval, TYPE_PRECISION (rtype), sgn);
+	*mask = wi::ext (rmask, rtype_precision, rtype_sgn);
+	*val = wi::ext (rval, rtype_precision, rtype_sgn);
 
 	/* Then extend mask and value according to the target type.  */
-	sgn = TYPE_SIGN (type);
-	*mask = wi::ext (*mask, TYPE_PRECISION (type), sgn);
-	*val = wi::ext (*val, TYPE_PRECISION (type), sgn);
+	*mask = wi::ext (*mask, type_precision, type_sgn);
+	*val = wi::ext (*val, type_precision, type_sgn);
 	break;
       }
 
@@ -1273,15 +1273,16 @@ bit_value_unop_1 (enum tree_code code, tree type,
    R1VAL, R1MASK and R2VAL, R2MASK representing a values of type R1TYPE
    and R2TYPE and set the value, mask pair *VAL and *MASK to the result.  */
 
-static void
-bit_value_binop_1 (enum tree_code code, tree type,
+void
+bit_value_binop_1 (enum tree_code code, signop type_sgn, unsigned type_precision,
 		   widest_int *val, widest_int *mask,
-		   tree r1type, const widest_int &r1val,
-		   const widest_int &r1mask, tree r2type,
+		   signop r1type_sgn, unsigned r1type_precision,
+		   const widest_int &r1val, const widest_int &r1mask,
+		   signop r2type_sgn, unsigned r2type_precision,
 		   const widest_int &r2val, const widest_int &r2mask)
 {
-  signop sgn = TYPE_SIGN (type);
-  int width = TYPE_PRECISION (type);
+  signop sgn = type_sgn;
+  int width = (int) type_precision;
   bool swap_p = false;
 
   /* Assume we'll get a constant result.  Use an initial non varying
@@ -1407,11 +1408,11 @@ bit_value_binop_1 (enum tree_code code, tree type,
     case MINUS_EXPR:
       {
 	widest_int temv, temm;
-	bit_value_unop_1 (NEGATE_EXPR, r2type, &temv, &temm,
-			  r2type, r2val, r2mask);
-	bit_value_binop_1 (PLUS_EXPR, type, val, mask,
-			   r1type, r1val, r1mask,
-			   r2type, temv, temm);
+	bit_value_unop_1 (NEGATE_EXPR, r2type_sgn, r2type_precision, &temv, &temm,
+			  r2type_sgn, r2type_precision, r2val, r2mask);
+	bit_value_binop_1 (PLUS_EXPR, type_sgn, type_precision, val, mask,
+			   r1type_sgn, r1type_precision, r1val, r1mask,
+			   r2type_sgn, r2type_precision, temv, temm);
 	break;
       }
 
@@ -1473,7 +1474,7 @@ bit_value_binop_1 (enum tree_code code, tree type,
 	  break;
 
 	/* For comparisons the signedness is in the comparison operands.  */
-	sgn = TYPE_SIGN (r1type);
+	sgn = r1type_sgn;
 
 	/* If we know the most significant bits we know the values
 	   value ranges by means of treating varying bits as zero
@@ -1526,8 +1527,9 @@ bit_value_unop (enum tree_code code, tree type, tree rhs)
   gcc_assert ((rval.lattice_val == CONSTANT
 	       && TREE_CODE (rval.value) == INTEGER_CST)
 	      || wi::sext (rval.mask, TYPE_PRECISION (TREE_TYPE (rhs))) == -1);
-  bit_value_unop_1 (code, type, &value, &mask,
-		    TREE_TYPE (rhs), value_to_wide_int (rval), rval.mask);
+  bit_value_unop_1 (code, TYPE_SIGN (type), TYPE_PRECISION (type), &value, &mask,
+		    TYPE_SIGN (TREE_TYPE (rhs)), TYPE_PRECISION (TREE_TYPE (rhs)),
+		    value_to_wide_int (rval), rval.mask);
   if (wi::sext (mask, TYPE_PRECISION (type)) != -1)
     {
       val.lattice_val = CONSTANT;
@@ -1572,9 +1574,11 @@ bit_value_binop (enum tree_code code, tree type, tree rhs1, tree rhs2)
 	       && TREE_CODE (r2val.value) == INTEGER_CST)
 	      || wi::sext (r2val.mask,
 			   TYPE_PRECISION (TREE_TYPE (rhs2))) == -1);
-  bit_value_binop_1 (code, type, &value, &mask,
-		     TREE_TYPE (rhs1), value_to_wide_int (r1val), r1val.mask,
-		     TREE_TYPE (rhs2), value_to_wide_int (r2val), r2val.mask);
+  bit_value_binop_1 (code, TYPE_SIGN (type), TYPE_PRECISION (type), &value, &mask,
+		     TYPE_SIGN (TREE_TYPE (rhs1)), TYPE_PRECISION (TREE_TYPE (rhs1)),
+		     value_to_wide_int (r1val), r1val.mask,
+		     TYPE_SIGN (TREE_TYPE (rhs2)), TYPE_PRECISION (TREE_TYPE (rhs2)),
+		     value_to_wide_int (r2val), r2val.mask);
   if (wi::sext (mask, TYPE_PRECISION (type)) != -1)
     {
       val.lattice_val = CONSTANT;
@@ -1673,9 +1677,9 @@ bit_value_assume_aligned (gimple *stmt, tree attr, ccp_prop_value_t ptrval,
 
   align = build_int_cst_type (type, -aligni);
   alignval = get_value_for_expr (align, true);
-  bit_value_binop_1 (BIT_AND_EXPR, type, &value, &mask,
-		     type, value_to_wide_int (ptrval), ptrval.mask,
-		     type, value_to_wide_int (alignval), alignval.mask);
+  bit_value_binop_1 (BIT_AND_EXPR, TYPE_SIGN (type), TYPE_PRECISION (type), &value, &mask,
+		     TYPE_SIGN (type), TYPE_PRECISION (type), value_to_wide_int (ptrval), ptrval.mask,
+		     TYPE_SIGN (type), TYPE_PRECISION (type), value_to_wide_int (alignval), alignval.mask);
   if (wi::sext (mask, TYPE_PRECISION (type)) != -1)
     {
       val.lattice_val = CONSTANT;
diff --git a/gcc/tree-ssa-ccp.h b/gcc/tree-ssa-ccp.h
new file mode 100644
index 0000000..b76a834
--- /dev/null
+++ b/gcc/tree-ssa-ccp.h
@@ -0,0 +1,30 @@
+/* Copyright (C) 2016-2016 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3, or (at your option) any
+later version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef TREE_SSA_CCP_H
+#define TREE_SSA_CCP_H
+
+void bit_value_binop_1 (enum tree_code, signop, unsigned, widest_int *, widest_int *,
+			signop, unsigned, const widest_int &, const widest_int &,
+			signop, unsigned, const widest_int &, const widest_int &);
+
+void bit_value_unop_1 (enum tree_code, signop, unsigned, widest_int *, widest_int *,
+		       signop, unsigned, const widest_int &, const widest_int &);
+
+
+#endif
diff --git a/gcc/tree.h b/gcc/tree.h
index fff65d6..e21b31d 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -2346,6 +2346,9 @@ extern machine_mode element_mode (const_tree t);
 #define DECL_IGNORED_P(NODE) \
   (DECL_COMMON_CHECK (NODE)->decl_common.ignored_flag)
 
+#define DECL_SET_BY_IPA(NODE) \
+  (DECL_COMMON_CHECK (NODE)->decl_common.set_by_ipa)
+
 /* Nonzero for a given ..._DECL node means that this node represents an
    "abstract instance" of the given declaration (e.g. in the original
    declaration of an inline function).  When generating symbolic debugging
