This corresponds to:
  [PATCH 39/89] Introduce gimple_omp_parallel
  https://gcc.gnu.org/ml/gcc-patches/2014-04/msg01159.html
from the original 89-patch kit

That earlier patch was approved by Jeff:
> OK with expected changes due to renaming/updates to const handling.
> Please repost the final patch for archival purposes.
in https://gcc.gnu.org/ml/gcc-patches/2014-05/msg00827.html

gcc/
        * coretypes.h (gimple_omp_parallel): New typedef.
        (const_gimple_omp_parallel): New typedef.

        * cgraphbuild.c (build_cgraph_edges): Convert check of code
        against GIMPLE_OMP_PARALLEL to a dyn_cast <gimple_omp_parallel>
        and new local.

        * gimple-pretty-print.c (dump_gimple_omp_parallel): Require a
        gimple_omp_parallel rather than a plain gimple.
        (pp_gimple_stmt_1): Add a checked cast to gimple_omp_parallel
        within GIMPLE_OMP_PARALLEL case of switch statement.

        * gimple-walk.c (walk_gimple_op): Likewise, introducing a local.

        * gimple.c (gimple_build_omp_parallel): Return a
        gimple_omp_parallel rather than a plain gimple.
        (gimple_copy): Add checked casts to gimple_omp_parallel within
        GIMPLE_OMP_PARALLEL case of switch statement, introducing locals.

        * gimple.h (gimple_build_omp_parallel): Return a
        gimple_omp_parallel rather than a plain gimple.
        (gimple_omp_parallel_clauses_ptr): Require a gimple_omp_parallel
        rather than a plain gimple.
        (gimple_omp_parallel_set_clauses): Likewise.
        (gimple_omp_parallel_data_arg_ptr): Likewise.
        (gimple_omp_parallel_set_data_arg): Likewise.
        (gimple_omp_parallel_child_fn_ptr): Likewise.
        (gimple_omp_parallel_set_child_fn): Likewise.
        (gimple_omp_parallel_child_fn): Require a
        const_gimple_omp_parallel rather than a plain const_gimple.
        (gimple_omp_parallel_data_arg): Likewise.

        * omp-low.c (scan_omp_parallel): Strengthen local "stmt" from
        gimple to gimple_omp_parallel.
        (expand_parallel_call): Require a gimple_omp_parallel for
        "entry_stmt" rather than a plain gimple.
        (remove_exit_barrier):  Strengthen local "parallel_stmt" from
        gimple to gimple_omp_parallel.
        (expand_omp_taskreg): Add checked casts to gimple_omp_parallel.

        * tree-inline.c (remap_gimple_stmt): Add a checked cast to
        gimple_omp_parallel within GIMPLE_OMP_PARALLEL case of switch
        statement, introducing local.
---
 gcc/ChangeLog.gimple-classes | 48 +++++++++++++++++++++++++++++++++++++++
 gcc/cgraphbuild.c            |  6 ++---
 gcc/coretypes.h              |  4 ++++
 gcc/gimple-pretty-print.c    |  7 +++---
 gcc/gimple-walk.c            | 27 ++++++++++++----------
 gcc/gimple.c                 | 23 ++++++++++++-------
 gcc/gimple.h                 | 54 ++++++++++++++++----------------------------
 gcc/omp-low.c                | 19 ++++++++++------
 gcc/tree-inline.c            | 16 ++++++++-----
 9 files changed, 131 insertions(+), 73 deletions(-)

diff --git a/gcc/ChangeLog.gimple-classes b/gcc/ChangeLog.gimple-classes
index 7ad116a..b0ddcd3 100644
--- a/gcc/ChangeLog.gimple-classes
+++ b/gcc/ChangeLog.gimple-classes
@@ -1,5 +1,53 @@
 2014-10-24  David Malcolm  <dmalc...@redhat.com>
 
+       Introduce gimple_omp_parallel
+
+       * coretypes.h (gimple_omp_parallel): New typedef.
+       (const_gimple_omp_parallel): New typedef.
+
+       * cgraphbuild.c (build_cgraph_edges): Convert check of code
+       against GIMPLE_OMP_PARALLEL to a dyn_cast <gimple_omp_parallel>
+       and new local.
+
+       * gimple-pretty-print.c (dump_gimple_omp_parallel): Require a
+       gimple_omp_parallel rather than a plain gimple.
+       (pp_gimple_stmt_1): Add a checked cast to gimple_omp_parallel
+       within GIMPLE_OMP_PARALLEL case of switch statement.
+
+       * gimple-walk.c (walk_gimple_op): Likewise, introducing a local.
+
+       * gimple.c (gimple_build_omp_parallel): Return a
+       gimple_omp_parallel rather than a plain gimple.
+       (gimple_copy): Add checked casts to gimple_omp_parallel within
+       GIMPLE_OMP_PARALLEL case of switch statement, introducing locals.
+
+       * gimple.h (gimple_build_omp_parallel): Return a
+       gimple_omp_parallel rather than a plain gimple.
+       (gimple_omp_parallel_clauses_ptr): Require a gimple_omp_parallel
+       rather than a plain gimple.
+       (gimple_omp_parallel_set_clauses): Likewise.
+       (gimple_omp_parallel_data_arg_ptr): Likewise.
+       (gimple_omp_parallel_set_data_arg): Likewise.
+       (gimple_omp_parallel_child_fn_ptr): Likewise.
+       (gimple_omp_parallel_set_child_fn): Likewise.
+       (gimple_omp_parallel_child_fn): Require a
+       const_gimple_omp_parallel rather than a plain const_gimple.
+       (gimple_omp_parallel_data_arg): Likewise.
+
+       * omp-low.c (scan_omp_parallel): Strengthen local "stmt" from
+       gimple to gimple_omp_parallel.
+       (expand_parallel_call): Require a gimple_omp_parallel for
+       "entry_stmt" rather than a plain gimple.
+       (remove_exit_barrier):  Strengthen local "parallel_stmt" from
+       gimple to gimple_omp_parallel.
+       (expand_omp_taskreg): Add checked casts to gimple_omp_parallel.
+
+       * tree-inline.c (remap_gimple_stmt): Add a checked cast to
+       gimple_omp_parallel within GIMPLE_OMP_PARALLEL case of switch
+       statement, introducing local.
+
+2014-10-24  David Malcolm  <dmalc...@redhat.com>
+
        Introduce gimple_omp_for
 
        * coretypes.h (gimple_omp_for): New.
diff --git a/gcc/cgraphbuild.c b/gcc/cgraphbuild.c
index 96d7015..be3e866 100644
--- a/gcc/cgraphbuild.c
+++ b/gcc/cgraphbuild.c
@@ -352,10 +352,10 @@ pass_build_cgraph_edges::execute (function *fun)
                                            bb->count, freq);
            }
          node->record_stmt_references (stmt);
-         if (gimple_code (stmt) == GIMPLE_OMP_PARALLEL
-             && gimple_omp_parallel_child_fn (stmt))
+         if (gimple_omp_parallel omp_par_stmt =
+             dyn_cast <gimple_omp_parallel> (stmt))
            {
-             tree fn = gimple_omp_parallel_child_fn (stmt);
+             tree fn = gimple_omp_parallel_child_fn (omp_par_stmt);
              node->create_reference (cgraph_node::get_create (fn),
                                      IPA_REF_ADDR, stmt);
            }
diff --git a/gcc/coretypes.h b/gcc/coretypes.h
index 273ba7e..641658f 100644
--- a/gcc/coretypes.h
+++ b/gcc/coretypes.h
@@ -188,6 +188,10 @@ struct gimple_statement_omp_for;
 typedef struct gimple_statement_omp_for *gimple_omp_for;
 typedef const struct gimple_statement_omp_for *const_gimple_omp_for;
 
+struct gimple_statement_omp_parallel;
+typedef struct gimple_statement_omp_parallel *gimple_omp_parallel;
+typedef const struct gimple_statement_omp_parallel *const_gimple_omp_parallel;
+
 union section;
 typedef union section section;
 struct gcc_options;
diff --git a/gcc/gimple-pretty-print.c b/gcc/gimple-pretty-print.c
index 69a4b4c..ea788c2 100644
--- a/gcc/gimple-pretty-print.c
+++ b/gcc/gimple-pretty-print.c
@@ -1857,8 +1857,8 @@ dump_gimple_phi (pretty_printer *buffer, gimple_phi phi, 
int spc, bool comment,
    dumpfile.h).  */
 
 static void
-dump_gimple_omp_parallel (pretty_printer *buffer, gimple gs, int spc,
-                          int flags)
+dump_gimple_omp_parallel (pretty_printer *buffer, gimple_omp_parallel gs,
+                         int spc, int flags)
 {
   if (flags & TDF_RAW)
     {
@@ -2137,7 +2137,8 @@ pp_gimple_stmt_1 (pretty_printer *buffer, gimple gs, int 
spc, int flags)
       break;
 
     case GIMPLE_OMP_PARALLEL:
-      dump_gimple_omp_parallel (buffer, gs, spc, flags);
+      dump_gimple_omp_parallel (buffer, as_a <gimple_omp_parallel> (gs), spc,
+                               flags);
       break;
 
     case GIMPLE_OMP_TASK:
diff --git a/gcc/gimple-walk.c b/gcc/gimple-walk.c
index 8293e0d..2b823ac 100644
--- a/gcc/gimple-walk.c
+++ b/gcc/gimple-walk.c
@@ -347,18 +347,21 @@ walk_gimple_op (gimple stmt, walk_tree_fn callback_op,
       break;
 
     case GIMPLE_OMP_PARALLEL:
-      ret = walk_tree (gimple_omp_parallel_clauses_ptr (stmt), callback_op,
-                      wi, pset);
-      if (ret)
-       return ret;
-      ret = walk_tree (gimple_omp_parallel_child_fn_ptr (stmt), callback_op,
-                      wi, pset);
-      if (ret)
-       return ret;
-      ret = walk_tree (gimple_omp_parallel_data_arg_ptr (stmt), callback_op,
-                      wi, pset);
-      if (ret)
-       return ret;
+      {
+       gimple_omp_parallel omp_par_stmt = as_a <gimple_omp_parallel> (stmt);
+       ret = walk_tree (gimple_omp_parallel_clauses_ptr (omp_par_stmt),
+                        callback_op, wi, pset);
+       if (ret)
+         return ret;
+       ret = walk_tree (gimple_omp_parallel_child_fn_ptr (omp_par_stmt),
+                        callback_op, wi, pset);
+       if (ret)
+         return ret;
+       ret = walk_tree (gimple_omp_parallel_data_arg_ptr (omp_par_stmt),
+                        callback_op, wi, pset);
+       if (ret)
+         return ret;
+      }
       break;
 
     case GIMPLE_OMP_TASK:
diff --git a/gcc/gimple.c b/gcc/gimple.c
index 3d8fd44..26bd509 100644
--- a/gcc/gimple.c
+++ b/gcc/gimple.c
@@ -865,11 +865,12 @@ gimple_build_omp_for (gimple_seq body, int kind, tree 
clauses, size_t collapse,
    CHILD_FN is the function created for the parallel threads to execute.
    DATA_ARG are the shared data argument(s).  */
 
-gimple
+gimple_omp_parallel
 gimple_build_omp_parallel (gimple_seq body, tree clauses, tree child_fn,
                           tree data_arg)
 {
-  gimple p = gimple_alloc (GIMPLE_OMP_PARALLEL, 0);
+  gimple_omp_parallel p =
+    as_a <gimple_omp_parallel> (gimple_alloc (GIMPLE_OMP_PARALLEL, 0));
   if (body)
     gimple_omp_set_body (p, body);
   gimple_omp_parallel_set_clauses (p, clauses);
@@ -1730,12 +1731,18 @@ gimple_copy (gimple stmt)
          goto copy_omp_body;
 
        case GIMPLE_OMP_PARALLEL:
-         t = unshare_expr (gimple_omp_parallel_clauses (stmt));
-         gimple_omp_parallel_set_clauses (copy, t);
-         t = unshare_expr (gimple_omp_parallel_child_fn (stmt));
-         gimple_omp_parallel_set_child_fn (copy, t);
-         t = unshare_expr (gimple_omp_parallel_data_arg (stmt));
-         gimple_omp_parallel_set_data_arg (copy, t);
+         {
+           gimple_omp_parallel omp_par_stmt =
+             as_a <gimple_omp_parallel> (stmt);
+           gimple_omp_parallel omp_par_copy =
+             as_a <gimple_omp_parallel> (copy);
+           t = unshare_expr (gimple_omp_parallel_clauses (omp_par_stmt));
+           gimple_omp_parallel_set_clauses (omp_par_copy, t);
+           t = unshare_expr (gimple_omp_parallel_child_fn (omp_par_stmt));
+           gimple_omp_parallel_set_child_fn (omp_par_copy, t);
+           t = unshare_expr (gimple_omp_parallel_data_arg (omp_par_stmt));
+           gimple_omp_parallel_set_data_arg (omp_par_copy, t);
+         }
          goto copy_omp_body;
 
        case GIMPLE_OMP_TASK:
diff --git a/gcc/gimple.h b/gcc/gimple.h
index 3ed5fc9..cc460499 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -1344,7 +1344,7 @@ gimple_debug gimple_build_debug_source_bind_stat (tree, 
tree, gimple MEM_STAT_DE
   gimple_build_debug_source_bind_stat ((var), (val), (stmt) MEM_STAT_INFO)
 gimple_omp_critical gimple_build_omp_critical (gimple_seq, tree);
 gimple_omp_for gimple_build_omp_for (gimple_seq, int, tree, size_t, 
gimple_seq);
-gimple gimple_build_omp_parallel (gimple_seq, tree, tree, tree);
+gimple_omp_parallel gimple_build_omp_parallel (gimple_seq, tree, tree, tree);
 gimple gimple_build_omp_task (gimple_seq, tree, tree, tree, tree, tree, tree);
 gimple gimple_build_omp_section (gimple_seq);
 gimple gimple_build_omp_master (gimple_seq);
@@ -4682,92 +4682,78 @@ gimple_omp_parallel_clauses (const_gimple gs)
 }
 
 
-/* Return a pointer to the clauses associated with OMP_PARALLEL GS.  */
+/* Return a pointer to the clauses associated with OMP_PARALLEL_STMT.  */
 
 static inline tree *
-gimple_omp_parallel_clauses_ptr (gimple gs)
+gimple_omp_parallel_clauses_ptr (gimple_omp_parallel omp_parallel_stmt)
 {
-  gimple_statement_omp_parallel *omp_parallel_stmt =
-    as_a <gimple_statement_omp_parallel *> (gs);
   return &omp_parallel_stmt->clauses;
 }
 
 
-/* Set CLAUSES to be the list of clauses associated with OMP_PARALLEL
-   GS.  */
+/* Set CLAUSES to be the list of clauses associated with OMP_PARALLEL_STMT.  */
 
 static inline void
-gimple_omp_parallel_set_clauses (gimple gs, tree clauses)
+gimple_omp_parallel_set_clauses (gimple_omp_parallel omp_parallel_stmt,
+                                tree clauses)
 {
-  gimple_statement_omp_parallel *omp_parallel_stmt =
-    as_a <gimple_statement_omp_parallel *> (gs);
   omp_parallel_stmt->clauses = clauses;
 }
 
 
-/* Return the child function used to hold the body of OMP_PARALLEL GS.  */
+/* Return the child function used to hold the body of OMP_PARALLEL_STMT.  */
 
 static inline tree
-gimple_omp_parallel_child_fn (const_gimple gs)
+gimple_omp_parallel_child_fn (const_gimple_omp_parallel omp_parallel_stmt)
 {
-  const gimple_statement_omp_parallel *omp_parallel_stmt =
-    as_a <const gimple_statement_omp_parallel *> (gs);
   return omp_parallel_stmt->child_fn;
 }
 
 /* Return a pointer to the child function used to hold the body of
-   OMP_PARALLEL GS.  */
+   OMP_PARALLEL_STMT.  */
 
 static inline tree *
-gimple_omp_parallel_child_fn_ptr (gimple gs)
+gimple_omp_parallel_child_fn_ptr (gimple_omp_parallel omp_parallel_stmt)
 {
-  gimple_statement_omp_parallel *omp_parallel_stmt =
-    as_a <gimple_statement_omp_parallel *> (gs);
   return &omp_parallel_stmt->child_fn;
 }
 
 
-/* Set CHILD_FN to be the child function for OMP_PARALLEL GS.  */
+/* Set CHILD_FN to be the child function for OMP_PARALLEL_STMT.  */
 
 static inline void
-gimple_omp_parallel_set_child_fn (gimple gs, tree child_fn)
+gimple_omp_parallel_set_child_fn (gimple_omp_parallel omp_parallel_stmt,
+                                 tree child_fn)
 {
-  gimple_statement_omp_parallel *omp_parallel_stmt =
-    as_a <gimple_statement_omp_parallel *> (gs);
   omp_parallel_stmt->child_fn = child_fn;
 }
 
 
 /* Return the artificial argument used to send variables and values
-   from the parent to the children threads in OMP_PARALLEL GS.  */
+   from the parent to the children threads in OMP_PARALLEL_STMT.  */
 
 static inline tree
-gimple_omp_parallel_data_arg (const_gimple gs)
+gimple_omp_parallel_data_arg (const_gimple_omp_parallel omp_parallel_stmt)
 {
-  const gimple_statement_omp_parallel *omp_parallel_stmt =
-    as_a <const gimple_statement_omp_parallel *> (gs);
   return omp_parallel_stmt->data_arg;
 }
 
 
-/* Return a pointer to the data argument for OMP_PARALLEL GS.  */
+/* Return a pointer to the data argument for OMP_PARALLEL_STMT.  */
 
 static inline tree *
-gimple_omp_parallel_data_arg_ptr (gimple gs)
+gimple_omp_parallel_data_arg_ptr (gimple_omp_parallel omp_parallel_stmt)
 {
-  gimple_statement_omp_parallel *omp_parallel_stmt =
-    as_a <gimple_statement_omp_parallel *> (gs);
   return &omp_parallel_stmt->data_arg;
 }
 
 
-/* Set DATA_ARG to be the data argument for OMP_PARALLEL GS.  */
+/* Set DATA_ARG to be the data argument for OMP_PARALLEL_STMT.  */
 
 static inline void
-gimple_omp_parallel_set_data_arg (gimple gs, tree data_arg)
+gimple_omp_parallel_set_data_arg (gimple_omp_parallel omp_parallel_stmt,
+                                 tree data_arg)
 {
-  gimple_statement_omp_parallel *omp_parallel_stmt =
-    as_a <gimple_statement_omp_parallel *> (gs);
   omp_parallel_stmt->data_arg = data_arg;
 }
 
diff --git a/gcc/omp-low.c b/gcc/omp-low.c
index a40a405..46155d6 100644
--- a/gcc/omp-low.c
+++ b/gcc/omp-low.c
@@ -2049,7 +2049,7 @@ scan_omp_parallel (gimple_stmt_iterator *gsi, omp_context 
*outer_ctx)
 {
   omp_context *ctx;
   tree name;
-  gimple stmt = gsi_stmt (*gsi);
+  gimple_omp_parallel stmt = as_a <gimple_omp_parallel> (gsi_stmt (*gsi));
 
   /* Ignore parallel directives with empty bodies, unless there
      are copyin clauses.  */
@@ -4363,7 +4363,8 @@ gimple_build_cond_empty (tree cond)
 
 static void
 expand_parallel_call (struct omp_region *region, basic_block bb,
-                     gimple entry_stmt, vec<tree, va_gc> *ws_args)
+                     gimple_omp_parallel entry_stmt,
+                     vec<tree, va_gc> *ws_args)
 {
   tree t, t1, t2, val, cond, c, clauses, flags;
   gimple_stmt_iterator gsi;
@@ -4526,7 +4527,7 @@ expand_parallel_call (struct omp_region *region, 
basic_block bb,
    ENTRY_STMT into the basic_block BB.  */
 
 static void
-expand_cilk_for_call (basic_block bb, gimple entry_stmt,
+expand_cilk_for_call (basic_block bb, gimple_omp_parallel entry_stmt,
                      vec <tree, va_gc> *ws_args)
 {
   tree t, t1, t2;
@@ -4719,7 +4720,8 @@ remove_exit_barrier (struct omp_region *region)
             of such a variable.  */
          if (any_addressable_vars < 0)
            {
-             gimple parallel_stmt = last_stmt (region->entry);
+             gimple_omp_parallel parallel_stmt =
+               as_a <gimple_omp_parallel> (last_stmt (region->entry));
              tree child_fun = gimple_omp_parallel_child_fn (parallel_stmt);
              tree local_decls, block, decl;
              unsigned ix;
@@ -5119,9 +5121,11 @@ expand_omp_taskreg (struct omp_region *region)
 
   /* Emit a library call to launch the children threads.  */
   if (is_cilk_for)
-    expand_cilk_for_call (new_bb, entry_stmt, ws_args);
+    expand_cilk_for_call (new_bb,
+                         as_a <gimple_omp_parallel> (entry_stmt), ws_args);
   else if (gimple_code (entry_stmt) == GIMPLE_OMP_PARALLEL)
-    expand_parallel_call (region, new_bb, entry_stmt, ws_args);
+    expand_parallel_call (region, new_bb,
+                         as_a <gimple_omp_parallel> (entry_stmt), ws_args);
   else
     expand_task_call (new_bb, entry_stmt);
   if (gimple_in_ssa_p (cfun))
@@ -6877,7 +6881,8 @@ expand_cilk_for (struct omp_region *region, struct 
omp_for_data *fd)
      comment).  */
 
   tree child_fndecl
-    = gimple_omp_parallel_child_fn (last_stmt (region->outer->entry));
+    = gimple_omp_parallel_child_fn (
+        as_a <gimple_omp_parallel> (last_stmt (region->outer->entry)));
   tree t, low_val = NULL_TREE, high_val = NULL_TREE;
   for (t = DECL_ARGUMENTS (child_fndecl); t; t = TREE_CHAIN (t))
     {
diff --git a/gcc/tree-inline.c b/gcc/tree-inline.c
index b3254e5..a4d5809 100644
--- a/gcc/tree-inline.c
+++ b/gcc/tree-inline.c
@@ -1362,12 +1362,16 @@ remap_gimple_stmt (gimple stmt, copy_body_data *id)
          break;
 
        case GIMPLE_OMP_PARALLEL:
-         s1 = remap_gimple_seq (gimple_omp_body (stmt), id);
-         copy = gimple_build_omp_parallel
-                  (s1,
-                   gimple_omp_parallel_clauses (stmt),
-                   gimple_omp_parallel_child_fn (stmt),
-                   gimple_omp_parallel_data_arg (stmt));
+         {
+           gimple_omp_parallel omp_par_stmt =
+             as_a <gimple_omp_parallel> (stmt);
+           s1 = remap_gimple_seq (gimple_omp_body (omp_par_stmt), id);
+           copy = gimple_build_omp_parallel
+                    (s1,
+                     gimple_omp_parallel_clauses (omp_par_stmt),
+                     gimple_omp_parallel_child_fn (omp_par_stmt),
+                     gimple_omp_parallel_data_arg (omp_par_stmt));
+         }
          break;
 
        case GIMPLE_OMP_TASK:
-- 
1.8.5.3

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