Untag more efficiently if USE_LSB_TAG.

[bpt/emacs.git] / src / ChangeLog

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 2012-05-09  Paul Eggert  <eggert@cs.ucla.edu>
 
+       Untag more efficiently if USE_LSB_TAG.
+       This is based on a proposal by YAMAMOTO Mitsuharu in
+       <http://lists.gnu.org/archive/html/emacs-devel/2008-01/msg01876.html>.
+       For an admittedly artificial (nth 8000 longlist) benchmark on
+       Fedora 15 x86-64, this yields a 25% CPU speedup.  Also, it shrinks
+       Emacs's overall text size by 1%.
+       * lisp.h (XUNTAG): New macro.
+       (XCONS, XVECTOR, XSTRING, XSYMBOL, XFLOAT, XMISC, XPROCESS, XWINDOW)
+       (XTERMINAL, XSUBR, XBUFFER, XCHAR_TABLE, XSUB_CHAR_TABLE, XBOOL_VECTOR)
+       (XSETTYPED_PSEUDOVECTOR, XHASH_TABLE, TYPED_PSEUDOVECTORP): Use it.
+       * eval.c (Fautoload):
+       * font.h (XFONT_SPEC, XFONT_ENTITY, XFONT_OBJECT):
+       * frame.h (XFRAME): Use XUNTAG.
+
        Port recent dbusbind.c changes to 32-bit --with-wide-int.
        * dbusbind.c (xd_append_arg, xd_retrieve_arg, Fdbus_message_internal):
        Remove unportable assumptions about print widths of types like