This splits out more cleanups from the main patch to make that smaller.
The only bigger part of the patch is making tree-stdarg track
escapes/varargs for SSA names more precise by not globbing on
SSA_NAME_VAR but instead using the bits [0..num_ssa_names-1] for
SSA names and [num_ssa_names,max_decl_uid + num_ssa_names] for decls
in its bitmap.  Eventually this pass will get rewritten by Micha anyway
who has pending patches to make va_arg survive until after inlining.

Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.

Richard.

2012-08-08  Richard Guenther  <rguent...@suse.de>

        * tree-call-cdce.c (check_pow): Simplify.
        (gen_conditions_for_pow_int_base): Likewise.
        * tree-ssa-dom.c (propagate_rhs_into_lhs): Do not handle
        virtual operands here.
        * tree-ssa-operands.c (get_name_decl): Remove unused function.
        * gimplify.c (gimple_regimplify_operands): Remove dead code.
        * tree-vrp.c (get_value_range): Move SSA_NAME_VAR access.
        * tree-parloops.c (create_phi_for_local_result): Use copy_ssa_name.
        * value-prof.c (gimple_ic): Use duplicate_ssa_name.
        (gimple_stringop_fixed_value): Likewise.
        * tree.c (needs_to_live_in_memory): Remove SSA name handling.
        * tree-stdarg.c (find_va_list_reference): Store SSA_NAME_VERSIONs
        in the bitmap alongside shifted DECL_UIDs.
        (va_list_counter_struct_op): Likewise.
        (va_list_ptr_read): Likewise.
        (va_list_ptr_write): Likewise.
        (check_va_list_escapes): Likewise.
        (check_all_va_list_escapes): Likewise.
        (execute_optimize_stdarg): Likewise.
        * tree-outof-ssa.c (insert_backedge_copies): Use copy_ssa_name.

Index: gcc/tree-outof-ssa.c
===================================================================
*** gcc/tree-outof-ssa.c.orig   2012-08-08 13:56:23.000000000 +0200
--- gcc/tree-outof-ssa.c        2012-08-08 14:20:22.116810728 +0200
*************** insert_backedge_copies (void)
*** 1030,1042 ****
        {
          gimple phi = gsi_stmt (gsi);
          tree result = gimple_phi_result (phi);
-         tree result_var;
          size_t i;
  
          if (!is_gimple_reg (result))
            continue;
  
-         result_var = SSA_NAME_VAR (result);
          for (i = 0; i < gimple_phi_num_args (phi); i++)
            {
              tree arg = gimple_phi_arg_def (phi, i);
--- 1030,1040 ----
*************** insert_backedge_copies (void)
*** 1048,1054 ****
                 needed.  */
              if ((e->flags & EDGE_DFS_BACK)
                  && (TREE_CODE (arg) != SSA_NAME
!                     || SSA_NAME_VAR (arg) != result_var
                      || trivially_conflicts_p (bb, result, arg)))
                {
                  tree name;
--- 1046,1052 ----
                 needed.  */
              if ((e->flags & EDGE_DFS_BACK)
                  && (TREE_CODE (arg) != SSA_NAME
!                     || SSA_NAME_VAR (arg) != SSA_NAME_VAR (result)
                      || trivially_conflicts_p (bb, result, arg)))
                {
                  tree name;
*************** insert_backedge_copies (void)
*** 1078,1087 ****
  
                  /* Create a new instance of the underlying variable of the
                     PHI result.  */
!                 stmt = gimple_build_assign (result_var,
                                              gimple_phi_arg_def (phi, i));
-                 name = make_ssa_name (result_var, stmt);
-                 gimple_assign_set_lhs (stmt, name);
  
                  /* copy location if present.  */
                  if (gimple_phi_arg_has_location (phi, i))
--- 1076,1084 ----
  
                  /* Create a new instance of the underlying variable of the
                     PHI result.  */
!                 name = copy_ssa_name (result, NULL);
!                 stmt = gimple_build_assign (name,
                                              gimple_phi_arg_def (phi, i));
  
                  /* copy location if present.  */
                  if (gimple_phi_arg_has_location (phi, i))

Index: gcc/tree-stdarg.c
===================================================================
*** gcc/tree-stdarg.c.orig      2012-08-08 13:56:23.000000000 +0200
--- gcc/tree-stdarg.c   2012-08-08 14:20:22.120810730 +0200
*************** find_va_list_reference (tree *tp, int *w
*** 266,276 ****
    tree var = *tp;
  
    if (TREE_CODE (var) == SSA_NAME)
!     var = SSA_NAME_VAR (var);
! 
!   if (TREE_CODE (var) == VAR_DECL
!       && bitmap_bit_p (va_list_vars, DECL_UID (var)))
!     return var;
  
    return NULL_TREE;
  }
--- 266,280 ----
    tree var = *tp;
  
    if (TREE_CODE (var) == SSA_NAME)
!     {
!       if (bitmap_bit_p (va_list_vars, SSA_NAME_VERSION (var)))
!       return var;
!     }
!   else if (TREE_CODE (var) == VAR_DECL)
!     {
!       if (bitmap_bit_p (va_list_vars, DECL_UID (var) + num_ssa_names))
!       return var;
!     }
  
    return NULL_TREE;
  }
*************** va_list_counter_struct_op (struct stdarg
*** 347,358 ****
      return false;
  
    if (TREE_CODE (var) != SSA_NAME
!       || bitmap_bit_p (si->va_list_vars, DECL_UID (SSA_NAME_VAR (var))))
      return false;
  
    base = get_base_address (ap);
    if (TREE_CODE (base) != VAR_DECL
!       || !bitmap_bit_p (si->va_list_vars, DECL_UID (base)))
      return false;
  
    if (TREE_OPERAND (ap, 1) == va_list_gpr_counter_field)
--- 351,362 ----
      return false;
  
    if (TREE_CODE (var) != SSA_NAME
!       || bitmap_bit_p (si->va_list_vars, SSA_NAME_VERSION (var)))
      return false;
  
    base = get_base_address (ap);
    if (TREE_CODE (base) != VAR_DECL
!       || !bitmap_bit_p (si->va_list_vars, DECL_UID (base) + num_ssa_names))
      return false;
  
    if (TREE_OPERAND (ap, 1) == va_list_gpr_counter_field)
*************** static bool
*** 371,383 ****
  va_list_ptr_read (struct stdarg_info *si, tree ap, tree tem)
  {
    if (TREE_CODE (ap) != VAR_DECL
!       || !bitmap_bit_p (si->va_list_vars, DECL_UID (ap)))
      return false;
  
    if (TREE_CODE (tem) != SSA_NAME
!       || bitmap_bit_p (si->va_list_vars,
!                      DECL_UID (SSA_NAME_VAR (tem)))
!       || is_global_var (SSA_NAME_VAR (tem)))
      return false;
  
    if (si->compute_sizes < 0)
--- 375,385 ----
  va_list_ptr_read (struct stdarg_info *si, tree ap, tree tem)
  {
    if (TREE_CODE (ap) != VAR_DECL
!       || !bitmap_bit_p (si->va_list_vars, DECL_UID (ap) + num_ssa_names))
      return false;
  
    if (TREE_CODE (tem) != SSA_NAME
!       || bitmap_bit_p (si->va_list_vars, SSA_NAME_VERSION (tem)))
      return false;
  
    if (si->compute_sizes < 0)
*************** va_list_ptr_read (struct stdarg_info *si
*** 405,412 ****
  
    /* Note the temporary, as we need to track whether it doesn't escape
       the current function.  */
!   bitmap_set_bit (si->va_list_escape_vars,
!                 DECL_UID (SSA_NAME_VAR (tem)));
    return true;
  }
  
--- 407,414 ----
  
    /* Note the temporary, as we need to track whether it doesn't escape
       the current function.  */
!   bitmap_set_bit (si->va_list_escape_vars, SSA_NAME_VERSION (tem));
! 
    return true;
  }
  
*************** va_list_ptr_write (struct stdarg_info *s
*** 423,433 ****
    unsigned HOST_WIDE_INT increment;
  
    if (TREE_CODE (ap) != VAR_DECL
!       || !bitmap_bit_p (si->va_list_vars, DECL_UID (ap)))
      return false;
  
    if (TREE_CODE (tem2) != SSA_NAME
!       || bitmap_bit_p (si->va_list_vars, DECL_UID (SSA_NAME_VAR (tem2))))
      return false;
  
    if (si->compute_sizes <= 0)
--- 425,435 ----
    unsigned HOST_WIDE_INT increment;
  
    if (TREE_CODE (ap) != VAR_DECL
!       || !bitmap_bit_p (si->va_list_vars, DECL_UID (ap) + num_ssa_names))
      return false;
  
    if (TREE_CODE (tem2) != SSA_NAME
!       || bitmap_bit_p (si->va_list_vars, SSA_NAME_VERSION (tem2)))
      return false;
  
    if (si->compute_sizes <= 0)
*************** check_va_list_escapes (struct stdarg_inf
*** 459,481 ****
  
    if (TREE_CODE (rhs) == SSA_NAME)
      {
!       if (! bitmap_bit_p (si->va_list_escape_vars,
!                         DECL_UID (SSA_NAME_VAR (rhs))))
        return;
      }
    else if (TREE_CODE (rhs) == ADDR_EXPR
           && TREE_CODE (TREE_OPERAND (rhs, 0)) == MEM_REF
           && TREE_CODE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 0)) == SSA_NAME)
      {
!       if (! bitmap_bit_p (si->va_list_escape_vars,
!                         DECL_UID (SSA_NAME_VAR (TREE_OPERAND
!                                                 (TREE_OPERAND (rhs, 0), 0)))))
        return;
      }
    else
      return;
  
!   if (TREE_CODE (lhs) != SSA_NAME || is_global_var (SSA_NAME_VAR (lhs)))
      {
        si->va_list_escapes = true;
        return;
--- 461,481 ----
  
    if (TREE_CODE (rhs) == SSA_NAME)
      {
!       if (! bitmap_bit_p (si->va_list_escape_vars, SSA_NAME_VERSION (rhs)))
        return;
      }
    else if (TREE_CODE (rhs) == ADDR_EXPR
           && TREE_CODE (TREE_OPERAND (rhs, 0)) == MEM_REF
           && TREE_CODE (TREE_OPERAND (TREE_OPERAND (rhs, 0), 0)) == SSA_NAME)
      {
!       tree ptr = TREE_OPERAND (TREE_OPERAND (rhs, 0), 0);
!       if (! bitmap_bit_p (si->va_list_escape_vars, SSA_NAME_VERSION (ptr)))
        return;
      }
    else
      return;
  
!   if (TREE_CODE (lhs) != SSA_NAME)
      {
        si->va_list_escapes = true;
        return;
*************** check_va_list_escapes (struct stdarg_inf
*** 511,518 ****
        return;
      }
  
!   bitmap_set_bit (si->va_list_escape_vars,
!                 DECL_UID (SSA_NAME_VAR (lhs)));
  }
  
  
--- 511,517 ----
        return;
      }
  
!   bitmap_set_bit (si->va_list_escape_vars, SSA_NAME_VERSION (lhs));
  }
  
  
*************** check_all_va_list_escapes (struct stdarg
*** 540,546 ****
          FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_ALL_USES)
            {
              if (! bitmap_bit_p (si->va_list_escape_vars,
!                                 DECL_UID (SSA_NAME_VAR (use))))
                continue;
  
              if (is_gimple_assign (stmt))
--- 539,545 ----
          FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_ALL_USES)
            {
              if (! bitmap_bit_p (si->va_list_escape_vars,
!                                 SSA_NAME_VERSION (use)))
                continue;
  
              if (is_gimple_assign (stmt))
*************** check_all_va_list_escapes (struct stdarg
*** 586,597 ****
  
                      if (TREE_CODE (lhs) == SSA_NAME
                          && bitmap_bit_p (si->va_list_escape_vars,
!                                          DECL_UID (SSA_NAME_VAR (lhs))))
                        continue;
  
                      if (TREE_CODE (lhs) == VAR_DECL
                          && bitmap_bit_p (si->va_list_vars,
!                                          DECL_UID (lhs)))
                        continue;
                    }
                  else if (rhs_code == ADDR_EXPR
--- 585,596 ----
  
                      if (TREE_CODE (lhs) == SSA_NAME
                          && bitmap_bit_p (si->va_list_escape_vars,
!                                          SSA_NAME_VERSION (lhs)))
                        continue;
  
                      if (TREE_CODE (lhs) == VAR_DECL
                          && bitmap_bit_p (si->va_list_vars,
!                                          DECL_UID (lhs) + num_ssa_names))
                        continue;
                    }
                  else if (rhs_code == ADDR_EXPR
*************** check_all_va_list_escapes (struct stdarg
*** 601,607 ****
                      tree lhs = gimple_assign_lhs (stmt);
  
                      if (bitmap_bit_p (si->va_list_escape_vars,
!                                       DECL_UID (SSA_NAME_VAR (lhs))))
                        continue;
                    }
                }
--- 600,606 ----
                      tree lhs = gimple_assign_lhs (stmt);
  
                      if (bitmap_bit_p (si->va_list_escape_vars,
!                                       SSA_NAME_VERSION (lhs)))
                        continue;
                    }
                }
*************** execute_optimize_stdarg (void)
*** 722,728 ****
              break;
            }
  
!         bitmap_set_bit (si.va_list_vars, DECL_UID (ap));
  
          /* VA_START_BB and VA_START_AP will be only used if there is just
             one va_start in the function.  */
--- 721,727 ----
              break;
            }
  
!         bitmap_set_bit (si.va_list_vars, DECL_UID (ap) + num_ssa_names);
  
          /* VA_START_BB and VA_START_AP will be only used if there is just
             one va_start in the function.  */
Index: gcc/tree.c
===================================================================
*** gcc/tree.c.orig     2012-08-08 13:56:23.000000000 +0200
--- gcc/tree.c  2012-08-08 14:49:41.511749811 +0200
*************** range_in_array_bounds_p (tree ref)
*** 10155,10163 ****
  bool
  needs_to_live_in_memory (const_tree t)
  {
-   if (TREE_CODE (t) == SSA_NAME)
-     t = SSA_NAME_VAR (t);
- 
    return (TREE_ADDRESSABLE (t)
          || is_global_var (t)
          || (TREE_CODE (t) == RESULT_DECL
--- 10155,10160 ----
Index: gcc/value-prof.c
===================================================================
*** gcc/value-prof.c.orig       2012-08-08 13:56:23.000000000 +0200
--- gcc/value-prof.c    2012-08-08 14:20:22.122810729 +0200
*************** gimple_ic (gimple icall_stmt, struct cgr
*** 1276,1285 ****
        tree result = gimple_call_lhs (icall_stmt);
        gimple phi = create_phi_node (result, join_bb);
        gimple_call_set_lhs (icall_stmt,
!                          make_ssa_name (SSA_NAME_VAR (result), icall_stmt));
        add_phi_arg (phi, gimple_call_lhs (icall_stmt), e_ij, UNKNOWN_LOCATION);
        gimple_call_set_lhs (dcall_stmt,
!                          make_ssa_name (SSA_NAME_VAR (result), dcall_stmt));
        add_phi_arg (phi, gimple_call_lhs (dcall_stmt), e_dj, UNKNOWN_LOCATION);
      }
  
--- 1276,1285 ----
        tree result = gimple_call_lhs (icall_stmt);
        gimple phi = create_phi_node (result, join_bb);
        gimple_call_set_lhs (icall_stmt,
!                          duplicate_ssa_name (result, icall_stmt));
        add_phi_arg (phi, gimple_call_lhs (icall_stmt), e_ij, UNKNOWN_LOCATION);
        gimple_call_set_lhs (dcall_stmt,
!                          duplicate_ssa_name (result, dcall_stmt));
        add_phi_arg (phi, gimple_call_lhs (dcall_stmt), e_dj, UNKNOWN_LOCATION);
      }
  
*************** gimple_stringop_fixed_value (gimple vcal
*** 1507,1516 ****
        tree result = gimple_call_lhs (vcall_stmt);
        gimple phi = create_phi_node (result, join_bb);
        gimple_call_set_lhs (vcall_stmt,
!                          make_ssa_name (SSA_NAME_VAR (result), vcall_stmt));
        add_phi_arg (phi, gimple_call_lhs (vcall_stmt), e_vj, UNKNOWN_LOCATION);
        gimple_call_set_lhs (icall_stmt,
!                          make_ssa_name (SSA_NAME_VAR (result), icall_stmt));
        add_phi_arg (phi, gimple_call_lhs (icall_stmt), e_ij, UNKNOWN_LOCATION);
      }
  
--- 1507,1516 ----
        tree result = gimple_call_lhs (vcall_stmt);
        gimple phi = create_phi_node (result, join_bb);
        gimple_call_set_lhs (vcall_stmt,
!                          duplicate_ssa_name (result, vcall_stmt));
        add_phi_arg (phi, gimple_call_lhs (vcall_stmt), e_vj, UNKNOWN_LOCATION);
        gimple_call_set_lhs (icall_stmt,
!                          duplicate_ssa_name (result, icall_stmt));
        add_phi_arg (phi, gimple_call_lhs (icall_stmt), e_ij, UNKNOWN_LOCATION);
      }
  
Index: gcc/tree-parloops.c
===================================================================
*** gcc/tree-parloops.c.orig    2012-08-08 13:56:23.000000000 +0200
--- gcc/tree-parloops.c 2012-08-08 14:20:22.122810729 +0200
*************** create_phi_for_local_result (void **slot
*** 1008,1016 ****
      e = EDGE_PRED (store_bb, 1);
    else
      e = EDGE_PRED (store_bb, 0);
!   local_res
!     = make_ssa_name (SSA_NAME_VAR (gimple_assign_lhs (reduc->reduc_stmt)),
!                    NULL);
    locus = gimple_location (reduc->reduc_stmt);
    new_phi = create_phi_node (local_res, store_bb);
    add_phi_arg (new_phi, reduc->init, e, locus);
--- 1012,1018 ----
      e = EDGE_PRED (store_bb, 1);
    else
      e = EDGE_PRED (store_bb, 0);
!   local_res = copy_ssa_name (gimple_assign_lhs (reduc->reduc_stmt), NULL);
    locus = gimple_location (reduc->reduc_stmt);
    new_phi = create_phi_node (local_res, store_bb);
    add_phi_arg (new_phi, reduc->init, e, locus);
Index: gcc/tree-vrp.c
===================================================================
*** gcc/tree-vrp.c.orig 2012-08-08 13:56:23.000000000 +0200
--- gcc/tree-vrp.c      2012-08-08 14:20:22.124810727 +0200
*************** get_value_range (const_tree var)
*** 718,726 ****
  
    /* If VAR is a default definition of a parameter, the variable can
       take any value in VAR's type.  */
-   sym = SSA_NAME_VAR (var);
    if (SSA_NAME_IS_DEFAULT_DEF (var))
      {
        if (TREE_CODE (sym) == PARM_DECL)
        {
          /* Try to use the "nonnull" attribute to create ~[0, 0]
--- 718,726 ----
  
    /* If VAR is a default definition of a parameter, the variable can
       take any value in VAR's type.  */
    if (SSA_NAME_IS_DEFAULT_DEF (var))
      {
+       sym = SSA_NAME_VAR (var);
        if (TREE_CODE (sym) == PARM_DECL)
        {
          /* Try to use the "nonnull" attribute to create ~[0, 0]
Index: gcc/gimplify.c
===================================================================
*** gcc/gimplify.c.orig 2012-08-08 13:56:23.000000000 +0200
--- gcc/gimplify.c      2012-08-08 14:20:22.127810729 +0200
*************** void
*** 8363,8369 ****
  gimple_regimplify_operands (gimple stmt, gimple_stmt_iterator *gsi_p)
  {
    size_t i, num_ops;
!   tree orig_lhs = NULL_TREE, lhs;
    gimple_seq pre = NULL;
    gimple post_stmt = NULL;
    struct gimplify_ctx gctx;
--- 8363,8369 ----
  gimple_regimplify_operands (gimple stmt, gimple_stmt_iterator *gsi_p)
  {
    size_t i, num_ops;
!   tree lhs;
    gimple_seq pre = NULL;
    gimple post_stmt = NULL;
    struct gimplify_ctx gctx;
*************** gimple_regimplify_operands (gimple stmt,
*** 8429,8435 ****
         and ASMs are executed before the LHS.  The ordering is not
         important for other statements.  */
        num_ops = gimple_num_ops (stmt);
-       orig_lhs = gimple_get_lhs (stmt);
        for (i = num_ops; i > 0; i--)
        {
          tree op = gimple_op (stmt, i - 1);
--- 8429,8434 ----
*************** gimple_regimplify_operands (gimple stmt,
*** 8507,8516 ****
          if (need_temp)
            {
              tree temp = create_tmp_reg (TREE_TYPE (lhs), NULL);
- 
-             if (TREE_CODE (orig_lhs) == SSA_NAME)
-               orig_lhs = SSA_NAME_VAR (orig_lhs);
- 
              if (gimple_in_ssa_p (cfun))
                temp = make_ssa_name (temp, NULL);
              gimple_set_lhs (stmt, temp);
--- 8506,8511 ----
Index: gcc/tree-call-cdce.c
===================================================================
*** gcc/tree-call-cdce.c.orig   2012-08-08 13:56:23.000000000 +0200
--- gcc/tree-call-cdce.c        2012-08-08 14:20:22.127810729 +0200
*************** check_pow (gimple pow_call)
*** 203,209 ****
      }
    else if (bc == SSA_NAME)
      {
!       tree base_val0, base_var, type;
        gimple base_def;
        int bit_sz;
  
--- 203,209 ----
      }
    else if (bc == SSA_NAME)
      {
!       tree base_val0, type;
        gimple base_def;
        int bit_sz;
  
*************** check_pow (gimple pow_call)
*** 217,227 ****
          return false;
        base_val0 = gimple_assign_rhs1 (base_def);
  
!       base_var = SSA_NAME_VAR (base_val0);
!       if (!DECL_P  (base_var))
!         return false;
! 
!       type = TREE_TYPE (base_var);
        if (TREE_CODE (type) != INTEGER_TYPE)
          return false;
        bit_sz = TYPE_PRECISION (type);
--- 217,223 ----
          return false;
        base_val0 = gimple_assign_rhs1 (base_def);
  
!       type = TREE_TYPE (base_val0);
        if (TREE_CODE (type) != INTEGER_TYPE)
          return false;
        bit_sz = TYPE_PRECISION (type);
*************** gen_conditions_for_pow_int_base (tree ba
*** 448,454 ****
  {
    gimple base_def;
    tree base_val0;
!   tree base_var, int_type;
    tree temp, tempn;
    tree cst0;
    gimple stmt1, stmt2;
--- 444,450 ----
  {
    gimple base_def;
    tree base_val0;
!   tree int_type;
    tree temp, tempn;
    tree cst0;
    gimple stmt1, stmt2;
*************** gen_conditions_for_pow_int_base (tree ba
*** 457,464 ****
  
    base_def = SSA_NAME_DEF_STMT (base);
    base_val0 = gimple_assign_rhs1 (base_def);
!   base_var = SSA_NAME_VAR (base_val0);
!   int_type = TREE_TYPE (base_var);
    bit_sz = TYPE_PRECISION (int_type);
    gcc_assert (bit_sz > 0
                && bit_sz <= MAX_BASE_INT_BIT_SIZE);
--- 453,459 ----
  
    base_def = SSA_NAME_DEF_STMT (base);
    base_val0 = gimple_assign_rhs1 (base_def);
!   int_type = TREE_TYPE (base_val0);
    bit_sz = TYPE_PRECISION (int_type);
    gcc_assert (bit_sz > 0
                && bit_sz <= MAX_BASE_INT_BIT_SIZE);
Index: gcc/tree-ssa-dom.c
===================================================================
*** gcc/tree-ssa-dom.c.orig     2012-08-08 13:56:23.000000000 +0200
--- gcc/tree-ssa-dom.c  2012-08-08 14:20:22.128810729 +0200
*************** propagate_rhs_into_lhs (gimple stmt, tre
*** 2687,2704 ****
          /* Special cases to avoid useless calls into the folding
             routines, operand scanning, etc.
  
!            First, propagation into a PHI may cause the PHI to become
             a degenerate, so mark the PHI as interesting.  No other
!            actions are necessary.
! 
!            Second, if we're propagating a virtual operand and the
!            propagation does not change the underlying _DECL node for
!            the virtual operand, then no further actions are necessary.  */
!         if (gimple_code (use_stmt) == GIMPLE_PHI
!             || (! is_gimple_reg (lhs)
!                 && TREE_CODE (rhs) == SSA_NAME
!                 && SSA_NAME_VAR (lhs) == SSA_NAME_VAR (rhs)))
            {
              /* Dump details.  */
              if (dump_file && (dump_flags & TDF_DETAILS))
                {
--- 2687,2699 ----
          /* Special cases to avoid useless calls into the folding
             routines, operand scanning, etc.
  
!            Propagation into a PHI may cause the PHI to become
             a degenerate, so mark the PHI as interesting.  No other
!            actions are necessary.  */
!         if (gimple_code (use_stmt) == GIMPLE_PHI)
            {
+             tree result;
+ 
              /* Dump details.  */
              if (dump_file && (dump_flags & TDF_DETAILS))
                {
*************** propagate_rhs_into_lhs (gimple stmt, tre
*** 2706,2719 ****
                  print_gimple_stmt (dump_file, use_stmt, 0, dump_flags);
                }
  
!             /* Propagation into a PHI may expose new degenerate PHIs,
!                so mark the result of the PHI as interesting.  */
!             if (gimple_code (use_stmt) == GIMPLE_PHI)
!               {
!                 tree result = get_lhs_or_phi_result (use_stmt);
!                 bitmap_set_bit (interesting_names, SSA_NAME_VERSION (result));
!               }
! 
              continue;
            }
  
--- 2701,2708 ----
                  print_gimple_stmt (dump_file, use_stmt, 0, dump_flags);
                }
  
!             result = get_lhs_or_phi_result (use_stmt);
!             bitmap_set_bit (interesting_names, SSA_NAME_VERSION (result));
              continue;
            }
  
Index: gcc/tree-ssa-operands.c
===================================================================
*** gcc/tree-ssa-operands.c.orig        2012-08-08 14:20:21.000000000 +0200
--- gcc/tree-ssa-operands.c     2012-08-08 14:20:22.128810729 +0200
*************** static void get_expr_operands (gimple, t
*** 126,142 ****
  /* Number of functions with initialized ssa_operands.  */
  static int n_initialized = 0;
  
- /* Return the DECL_UID of the base variable of T.  */
- 
- static inline unsigned
- get_name_decl (const_tree t)
- {
-   if (TREE_CODE (t) != SSA_NAME)
-     return DECL_UID (t);
-   else
-     return DECL_UID (SSA_NAME_VAR (t));
- }
- 
  
  /*  Return true if the SSA operands cache is active.  */
  
--- 126,131 ----

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