Change object marking routines to minimize stack usage.

This change moves a few cold paths from mark_object to NO_INLINE
functions and adjusts symbol marking loop.  According to GCC 4.8.2
-Wstack-usage, this reduces mark_object's stack usage from 80 to
48 bytes on a 64-bit system.  For a long byte-force-recompile runs,
stack usage at the mark phase is reduced up to 28%.  Surprisingly,
it also gains up to 3% in speed (with default '-O2 -g3' flags).
* alloc.c (mark_compiled, mark_localized_symbol): New functions,
refactored out from ...
(mark_object): ... adjusted user.  Also mark symbols in a tight
inner loop.
(mark_face_cache): Add NO_INLINE.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 4aada1d5279..2cdaf494aad 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,18 @@
+2014-06-08  Dmitry Antipov  <dmantipov@yandex.ru>
+
+        Change object marking routines to minimize stack usage.
+        This change moves a few cold paths from mark_object to NO_INLINE
+        functions and adjusts symbol marking loop.  According to GCC 4.8.2
+        -Wstack-usage, this reduces mark_object's stack usage from 80 to
+        48 bytes on a 64-bit system.  For a long byte-force-recompile runs,
+        stack usage at the mark phase is reduced up to 28%.  Surprisingly,
+        it also gains up to 3% in speed (with default '-O2 -g3' flags).
+        * alloc.c (mark_compiled, mark_localized_symbol): New functions,
+        refactored out from ...
+        (mark_object): ... adjusted user.  Also mark symbols in a tight
+        inner loop.
+        (mark_face_cache): Add NO_INLINE.
+
 2014-06-08  Eli Zaretskii  <eliz@gnu.org>
 
         * sysdep.c (reset_sys_modes): Use cursorX, not curX, as the latter