On 11/13/20 9:27 AM, Richard Biener wrote:
On Fri, Nov 13, 2020 at 3:04 PM Nathan Sidwell <nat...@acm.org> wrote:


  struct GTY(()) lang_decl_base {
-  /* Larger than necessary for faster access.  */
-  ENUM_BITFIELD(lang_decl_selector) selector : 16;
+  ENUM_BITFIELD(lang_decl_selector) selector : 3;
...
+  unsigned attached_decls_p : 1;
+
+  /* 10 spare bits.  */

so for "faster access' you could still make selector 8 bits, reducing
spare bits to 5.

could do -- we always know what kind of lang_decl to expect from the originating tree's code. It's only for the garbage collector that we need the selector. (+ the checkers)
Can you add comments (like on some other bits var / fn / type)
what kind of decls the new bits are used on?  Maybe some
bits can be overloaded if spare bits are needed.

sure. For the record it's VAR_DECL, TYPE_DECL, FUNCTION_DECL, CONCEPT_DECL, TEMPLATE_DECL, NAMESPACE_DECL (that's to many for a TREE_CHECK, we only go to 5).


Thanks,
Richard.

nathan

--
Nathan Sidwell


--
Nathan Sidwell

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