For a 'struct window', replace some Lisp_Object fields to

bitfields where appropriate, remove unused fields.
* window.h (struct window): Remove unused 'last_mark_x' and
'last_mark_y' fields.  Rename 'mini_p' field to 'mini',
change it's type from Lisp_Object to bitfield.
Change type of 'force_start', 'optional_new_start',
'last_had_star', 'update_mode_line' and 'start_at_line_beg'
fields from Lisp_Object to bitfield. Adjust users accordingly.

8 files changed, 113 insertions, 107 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 6d71346dd78..12845538a9e 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,14 @@
+2012-06-01  Dmitry Antipov  <dmantipov@yandex.ru>
+
+        For a 'struct window', replace some Lisp_Object fields to
+        bitfields where appropriate, remove unused fields.
+        * window.h (struct window): Remove unused 'last_mark_x' and
+        'last_mark_y' fields.  Rename 'mini_p' field to 'mini',
+        change it's type from Lisp_Object to bitfield.
+        Change type of 'force_start', 'optional_new_start',
+        'last_had_star', 'update_mode_line' and 'start_at_line_beg'
+        fields from Lisp_Object to bitfield. Adjust users accordingly.
+
 2012-05-31  Paul Eggert  <eggert@cs.ucla.edu>
 
         Pacify gcc -Wdouble-precision when using Xaw.
diff --git a/src/fileio.c b/src/fileio.c
index c6e2eea5089..496f9d7efa4 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3735,7 +3735,7 @@ variable `last-coding-system-used' to the coding system actually used.  */)
           /* If display currently starts at beginning of line,
              keep it that way.  */
           if (XBUFFER (XWINDOW (selected_window)->buffer) == current_buffer)
-            XWINDOW (selected_window)->start_at_line_beg = Fbolp ();
+            XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ());
 
           replace_handled = 1;
         }
@@ -3892,7 +3892,7 @@ variable `last-coding-system-used' to the coding system actually used.  */)
       /* If display currently starts at beginning of line,
          keep it that way.  */
       if (XBUFFER (XWINDOW (selected_window)->buffer) == current_buffer)
-        XWINDOW (selected_window)->start_at_line_beg = Fbolp ();
+        XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ());
 
       /* Replace the chars that we need to replace,
          and update INSERTED to equal the number of bytes
diff --git a/src/frame.c b/src/frame.c
index e962251f420..744485d4615 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -331,7 +331,7 @@ make_frame (int mini_p)
       mini_window = make_window ();
       XWINDOW (root_window)->next = mini_window;
       XWINDOW (mini_window)->prev = root_window;
-      XWINDOW (mini_window)->mini_p = Qt;
+      XWINDOW (mini_window)->mini = 1;
       XWINDOW (mini_window)->frame = frame;
       f->minibuffer_window = mini_window;
     }
@@ -480,7 +480,7 @@ make_minibuffer_frame (void)
      as nil. */
 
   mini_window = f->minibuffer_window = f->root_window;
-  XWINDOW (mini_window)->mini_p = Qt;
+  XWINDOW (mini_window)->mini = 1;
   XWINDOW (mini_window)->next = Qnil;
   XWINDOW (mini_window)->prev = Qnil;
   XWINDOW (mini_window)->frame = frame;
diff --git a/src/keyboard.c b/src/keyboard.c
index 339cf2a7e9e..2642ad7734b 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -1484,10 +1484,10 @@ command_loop_1 (void)
          from that position.  But also throw away beg_unchanged and
          end_unchanged information in that case, so that redisplay will
          update the whole window properly.  */
-      if (!NILP (XWINDOW (selected_window)->force_start))
+      if (XWINDOW (selected_window)->force_start)
         {
           struct buffer *b;
-          XWINDOW (selected_window)->force_start = Qnil;
+          XWINDOW (selected_window)->force_start = 0;
           b = XBUFFER (XWINDOW (selected_window)->buffer);
           BUF_BEG_UNCHANGED (b) = BUF_END_UNCHANGED (b) = 0;
         }
diff --git a/src/window.c b/src/window.c
index 37bcf64181a..54ad0af4c3f 100644
--- a/src/window.c
+++ b/src/window.c
@@ -1393,10 +1393,10 @@ overriding motion of point in order to display at this exact start.  */)
   CHECK_NUMBER_COERCE_MARKER (pos);
   set_marker_restricted (w->start, pos, w->buffer);
   /* this is not right, but much easier than doing what is right. */
-  w->start_at_line_beg = Qnil;
+  w->start_at_line_beg = 0;
   if (NILP (noforce))
-    w->force_start = Qt;
-  w->update_mode_line = Qt;
+    w->force_start = 1;
+  w->update_mode_line = 1;
   XSETFASTINT (w->last_modified, 0);
   XSETFASTINT (w->last_overlay_modified, 0);
   if (!EQ (window, selected_window))
@@ -2472,7 +2472,7 @@ window_loop (enum window_loop type, Lisp_Object obj, int mini, Lisp_Object frame
             if (EQ (w->buffer, obj))
               {
                 mark_window_display_accurate (window, 0);
-                w->update_mode_line = Qt;
+                w->update_mode_line = 1;
                 XBUFFER (obj)->prevent_redisplay_optimizations_p = 1;
                 ++update_mode_lines;
                 best_window = window;
@@ -2771,12 +2771,11 @@ window-start value is reasonable when this function is called.  */)
 
           set_marker_both (w->start, w->buffer, pos.bufpos, pos.bytepos);
           w->window_end_valid = Qnil;
-          w->start_at_line_beg = ((pos.bytepos == BEGV_BYTE
-                                   || FETCH_BYTE (pos.bytepos - 1) == '\n') ? Qt
-                                  : Qnil);
+          w->start_at_line_beg = (pos.bytepos == BEGV_BYTE
+                                    || FETCH_BYTE (pos.bytepos - 1) == '\n');
           /* We need to do this, so that the window-scroll-functions
              get called.  */
-          w->optional_new_start = Qt;
+          w->optional_new_start = 1;
 
           set_buffer_internal (obuf);
         }
@@ -3006,8 +3005,8 @@ set_window_buffer (Lisp_Object window, Lisp_Object buffer, int run_hooks_p, int
       set_marker_restricted (w->start,
                              make_number (b->last_window_start),
                              buffer);
-      w->start_at_line_beg = Qnil;
-      w->force_start = Qnil;
+      w->start_at_line_beg = 0;
+      w->force_start = 0;
       XSETFASTINT (w->last_modified, 0);
       XSETFASTINT (w->last_overlay_modified, 0);
     }
@@ -3143,7 +3142,7 @@ displaying that buffer.  */)
     {
       struct window *w = XWINDOW (object);
       mark_window_display_accurate (object, 0);
-      w->update_mode_line = Qt;
+      w->update_mode_line = 1;
       if (BUFFERP (w->buffer))
         XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
       ++update_mode_lines;
@@ -3275,7 +3274,8 @@ make_window (void)
 
   w = allocate_window ();
   /* Initialize all Lisp data.  */
-  w->frame = w->mini_p = Qnil;
+  w->frame = Qnil;
+  w->mini = 0;
   w->next = w->prev = w->hchild = w->vchild = w->parent = Qnil;
   XSETFASTINT (w->left_col, 0);
   XSETFASTINT (w->top_line, 0);
@@ -3288,7 +3288,7 @@ make_window (void)
   w->buffer = Qnil;
   w->start = Fmake_marker ();
   w->pointm = Fmake_marker ();
-  w->force_start = w->optional_new_start = Qnil;
+  w->force_start = w->optional_new_start = 0;
   XSETFASTINT (w->hscroll, 0);
   XSETFASTINT (w->min_hscroll, 0);
   XSETFASTINT (w->use_time, 0);
@@ -3296,17 +3296,18 @@ make_window (void)
   XSETFASTINT (w->sequence_number, sequence_number);
   w->temslot = w->last_modified = w->last_overlay_modified = Qnil;
   XSETFASTINT (w->last_point, 0);
-  w->last_had_star = w->vertical_scroll_bar = Qnil;
+  w->last_had_star = 0;
+  w->vertical_scroll_bar = Qnil;
   w->left_margin_cols = w->right_margin_cols = Qnil;
   w->left_fringe_width = w->right_fringe_width = Qnil;
   w->fringes_outside_margins = Qnil;
   w->scroll_bar_width = Qnil;
   w->vertical_scroll_bar_type = Qt;
-  w->last_mark_x = w->last_mark_y = Qnil;
   XSETFASTINT (w->window_end_pos, 0);
   XSETFASTINT (w->window_end_vpos, 0);
-  w->window_end_valid = w->update_mode_line = Qnil;
-  w->start_at_line_beg = w->display_table = w->dedicated = Qnil;
+  w->window_end_valid = w->display_table = Qnil;
+  w->update_mode_line = w->start_at_line_beg = 0;
+  w->dedicated = Qnil;
   w->base_line_number = w->base_line_pos = w->region_showing = Qnil;
   w->column_number_displayed = w->redisplay_end_trigger = Qnil;
   w->combination_limit = w->window_parameters = Qnil;
@@ -4305,13 +4306,13 @@ window_scroll_pixel_based (Lisp_Object window, int n, int whole, int noerror)
                     spos = min (XINT (Fline_end_position (Qnil)) + 1, ZV);
                   set_marker_restricted (w->start, make_number (spos),
                                          w->buffer);
-                  w->start_at_line_beg = Qt;
-                  w->update_mode_line = Qt;
+                  w->start_at_line_beg = 1;
+                  w->update_mode_line = 1;
                   XSETFASTINT (w->last_modified, 0);
                   XSETFASTINT (w->last_overlay_modified, 0);
                   /* Set force_start so that redisplay_window will run the
                      window-scroll-functions.  */
-                  w->force_start = Qt;
+                  w->force_start = 1;
                   return;
                 }
             }
@@ -4451,14 +4452,13 @@ window_scroll_pixel_based (Lisp_Object window, int n, int whole, int noerror)
       set_marker_restricted (w->start, make_number (pos),
                              w->buffer);
       bytepos = XMARKER (w->start)->bytepos;
-      w->start_at_line_beg = ((pos == BEGV || FETCH_BYTE (bytepos - 1) == '\n')
-                              ? Qt : Qnil);
-      w->update_mode_line = Qt;
+      w->start_at_line_beg = (pos == BEGV || FETCH_BYTE (bytepos - 1) == '\n');
+      w->update_mode_line = 1;
       XSETFASTINT (w->last_modified, 0);
       XSETFASTINT (w->last_overlay_modified, 0);
       /* Set force_start so that redisplay_window will run the
          window-scroll-functions.  */
-      w->force_start = Qt;
+      w->force_start = 1;
     }
 
   /* The rest of this function uses current_y in a nonstandard way,
@@ -4651,13 +4651,13 @@ window_scroll_line_based (Lisp_Object window, int n, int whole, int noerror)
         max (0, min (scroll_margin, XINT (w->total_lines) / 4));
 
       set_marker_restricted_both (w->start, w->buffer, pos, pos_byte);
-      w->start_at_line_beg = bolp;
-      w->update_mode_line = Qt;
+      w->start_at_line_beg = !NILP (bolp);
+      w->update_mode_line = 1;
       XSETFASTINT (w->last_modified, 0);
       XSETFASTINT (w->last_overlay_modified, 0);
       /* Set force_start so that redisplay_window will run
          the window-scroll-functions.  */
-      w->force_start = Qt;
+      w->force_start = 1;
 
       if (!NILP (Vscroll_preserve_screen_position)
           && (whole || !EQ (Vscroll_preserve_screen_position, Qt)))
@@ -5201,12 +5201,10 @@ and redisplay normally--don't erase and redraw the frame.  */)
   set_marker_both (w->start, w->buffer, charpos, bytepos);
   w->window_end_valid = Qnil;
 
-  w->optional_new_start = Qt;
+  w->optional_new_start = 1;
 
-  if (bytepos == BEGV_BYTE || FETCH_BYTE (bytepos - 1) == '\n')
-    w->start_at_line_beg = Qt;
-  else
-    w->start_at_line_beg = Qnil;
+  w->start_at_line_beg = (bytepos == BEGV_BYTE ||
+                          FETCH_BYTE (bytepos - 1) == '\n');
 
   set_buffer_internal (obuf);
   return Qnil;
@@ -5257,8 +5255,8 @@ zero means top of window, negative means relative to bottom of window.  */)
       int height = window_internal_height (w);
       Fvertical_motion (make_number (- (height / 2)), window);
       set_marker_both (w->start, w->buffer, PT, PT_BYTE);
-      w->start_at_line_beg = Fbolp ();
-      w->force_start = Qt;
+      w->start_at_line_beg = !NILP (Fbolp ());
+      w->force_start = 1;
     }
   else
     Fgoto_char (w->start);
@@ -5607,7 +5605,7 @@ the return value is nil.  Otherwise the value is t.  */)
             /* If saved buffer is alive, install it.  */
             {
               w->buffer = p->buffer;
-              w->start_at_line_beg = p->start_at_line_beg;
+              w->start_at_line_beg = !NILP (p->start_at_line_beg);
               set_marker_restricted (w->start, p->start, w->buffer);
               set_marker_restricted (w->pointm, p->pointm, w->buffer);
               Fset_marker (BVAR (XBUFFER (w->buffer), mark),
@@ -5632,7 +5630,7 @@ the return value is nil.  Otherwise the value is t.  */)
                 set_marker_restricted_both (w->pointm, w->buffer,
                                             BUF_PT (XBUFFER (w->buffer)),
                                             BUF_PT_BYTE (XBUFFER (w->buffer)));
-              w->start_at_line_beg = Qt;
+              w->start_at_line_beg = 1;
             }
           else if (STRINGP (auto_buffer_name =
                             Fwindow_parameter (window, Qauto_buffer_name))
@@ -5641,7 +5639,7 @@ the return value is nil.  Otherwise the value is t.  */)
             {
               set_marker_restricted (w->start, make_number (0), w->buffer);
               set_marker_restricted (w->pointm, make_number (0), w->buffer);
-              w->start_at_line_beg = Qt;
+              w->start_at_line_beg = 1;
             }
           else
             /* Window has no live buffer, get one.  */
@@ -5655,7 +5653,7 @@ the return value is nil.  Otherwise the value is t.  */)
                  range.  */
               set_marker_restricted (w->start, make_number (0), w->buffer);
               set_marker_restricted (w->pointm, make_number (0), w->buffer);
-              w->start_at_line_beg = Qt;
+              w->start_at_line_beg = 1;
               if (!NILP (w->dedicated))
                 /* Record this window as dead.  */
                 dead_windows = Fcons (window, dead_windows);
@@ -5956,7 +5954,7 @@ save_window_save (Lisp_Object window, struct Lisp_Vector *vector, int i)
             = !NILP (Vwindow_point_insertion_type);
 
           p->start = Fcopy_marker (w->start, Qnil);
-          p->start_at_line_beg = w->start_at_line_beg;
+          p->start_at_line_beg = w->start_at_line_beg ? Qt : Qnil;
 
           tem = BVAR (XBUFFER (w->buffer), mark);
           p->mark = Fcopy_marker (tem, Qnil);
diff --git a/src/window.h b/src/window.h
index 1524805579f..0d3910c8cb0 100644
--- a/src/window.h
+++ b/src/window.h
@@ -94,9 +94,6 @@ struct window
     /* The frame this window is on.  */
     Lisp_Object frame;
 
-    /* t if this window is a minibuffer window.  */
-    Lisp_Object mini_p;
-
     /* Following (to right or down) and preceding (to left or up) child
        at same level of tree.  */
     Lisp_Object next, prev;
@@ -144,15 +141,6 @@ struct window
        each one can have its own value of point.  */
     Lisp_Object pointm;
 
-    /* Non-nil means next redisplay must use the value of start
-       set up for it in advance.  Set by scrolling commands.  */
-    Lisp_Object force_start;
-    /* Non-nil means we have explicitly changed the value of start,
-       but that the next redisplay is not obliged to use the new value.
-       This is used in Fdelete_other_windows to force a call to
-       Vwindow_scroll_functions; also by Frecenter with argument.  */
-    Lisp_Object optional_new_start;
-
     /* Number of columns display within the window is scrolled to the left.  */
     Lisp_Object hscroll;
     /* Minimum hscroll for automatic hscrolling.  This is the value
@@ -176,9 +164,6 @@ struct window
     Lisp_Object last_overlay_modified;
     /* Value of point at that time.  */
     Lisp_Object last_point;
-    /* Non-nil if the buffer was "modified" when the window
-       was last updated.  */
-    Lisp_Object last_had_star;
 
     /* This window's vertical scroll bar.  This field is only for use
        by the window-system-dependent code which implements the
@@ -206,11 +191,6 @@ struct window
        no scroll bar.  A value of t means use frame value.  */
     Lisp_Object vertical_scroll_bar_type;
 
-    /* Frame coords of mark as of last time display completed */
-    /* May be nil if mark does not exist or was not on frame */
-    Lisp_Object last_mark_x;
-    Lisp_Object last_mark_y;
-
     /* Z - the buffer position of the last glyph in the current matrix
        of W.  Only valid if WINDOW_END_VALID is not nil.  */
     Lisp_Object window_end_pos;
@@ -223,18 +203,13 @@ struct window
        did not get onto the frame.  */
     Lisp_Object window_end_valid;
 
-    /* Non-nil means must regenerate mode line of this window */
-    Lisp_Object update_mode_line;
-
-    /* Non-nil means current value of `start'
-       was the beginning of a line when it was chosen.  */
-    Lisp_Object start_at_line_beg;
-
     /* Display-table to use for displaying chars in this window.
        Nil means use the buffer's own display-table.  */
     Lisp_Object display_table;
 
-    /* Non-nil means window is marked as dedicated.  */
+    /* Non-nil usually means window is marked as dedicated.
+       Note Lisp code may set this to something beyond Qnil
+       and Qt, so bitfield can't be used here.  */
     Lisp_Object dedicated;
 
     /* Line number and position of a line somewhere above the top of the
@@ -302,6 +277,30 @@ struct window
     /* This is handy for undrawing the cursor.  */
     int phys_cursor_ascent, phys_cursor_height;
 
+    /* Non-zero if this window is a minibuffer window.  */
+    unsigned mini : 1;
+
+    /* Non-zero means must regenerate mode line of this window */
+    unsigned update_mode_line : 1;
+
+    /* Non-nil if the buffer was "modified" when the window
+       was last updated.  */
+    unsigned last_had_star : 1;
+
+    /* Non-zero means current value of `start'
+       was the beginning of a line when it was chosen.  */
+    unsigned start_at_line_beg : 1;
+
+    /* Non-zero means next redisplay must use the value of start
+       set up for it in advance.  Set by scrolling commands.  */
+    unsigned force_start : 1;
+
+    /* Non-zero means we have explicitly changed the value of start,
+       but that the next redisplay is not obliged to use the new value.
+       This is used in Fdelete_other_windows to force a call to
+       Vwindow_scroll_functions; also by Frecenter with argument.  */
+    unsigned optional_new_start : 1;
+
     /* Non-zero means the cursor is currently displayed.  This can be
        set to zero by functions overpainting the cursor image.  */
     unsigned phys_cursor_on_p : 1;
@@ -337,7 +336,7 @@ struct window
 
 /* 1 if W is a minibuffer window.  */
 
-#define MINI_WINDOW_P(W)        (!NILP ((W)->mini_p))
+#define MINI_WINDOW_P(W)        ((W)->mini)
 
 /* General window layout:
 
diff --git a/src/xdisp.c b/src/xdisp.c
index f5d17877d1c..0763fc19c73 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -11169,7 +11169,7 @@ update_menu_bar (struct frame *f, int save_match_data, int hooks_run)
           || update_mode_lines
           || ((BUF_SAVE_MODIFF (XBUFFER (w->buffer))
                < BUF_MODIFF (XBUFFER (w->buffer)))
-              != !NILP (w->last_had_star))
+              != w->last_had_star)
           || ((!NILP (Vtransient_mark_mode)
                && !NILP (BVAR (XBUFFER (w->buffer), mark_active)))
               != !NILP (w->region_showing)))
@@ -11221,11 +11221,11 @@ update_menu_bar (struct frame *f, int save_match_data, int hooks_run)
           else
             /* On a terminal screen, the menu bar is an ordinary screen
                line, and this makes it get updated.  */
-            w->update_mode_line = Qt;
+            w->update_mode_line = 1;
 #else /* ! (USE_X_TOOLKIT || HAVE_NTGUI || HAVE_NS || USE_GTK) */
           /* In the non-toolkit version, the menu bar is an ordinary screen
              line, and this makes it get updated.  */
-          w->update_mode_line = Qt;
+          w->update_mode_line = 1;
 #endif /* ! (USE_X_TOOLKIT || HAVE_NTGUI || HAVE_NS || USE_GTK) */
 
           unbind_to (count, Qnil);
@@ -11363,11 +11363,11 @@ update_tool_bar (struct frame *f, int save_match_data)
          the rest of the redisplay algorithm is about the same as
          windows_or_buffers_changed anyway.  */
       if (windows_or_buffers_changed
-          || !NILP (w->update_mode_line)
+          || w->update_mode_line
           || update_mode_lines
           || ((BUF_SAVE_MODIFF (XBUFFER (w->buffer))
                < BUF_MODIFF (XBUFFER (w->buffer)))
-              != !NILP (w->last_had_star))
+              != w->last_had_star)
           || ((!NILP (Vtransient_mark_mode)
                && !NILP (BVAR (XBUFFER (w->buffer), mark_active)))
               != !NILP (w->region_showing)))
@@ -11418,7 +11418,7 @@ update_tool_bar (struct frame *f, int save_match_data)
               BLOCK_INPUT;
               f->tool_bar_items = new_tool_bar;
               f->n_tool_bar_items = new_n_tool_bar;
-              w->update_mode_line = Qt;
+              w->update_mode_line = 1;
               UNBLOCK_INPUT;
             }
 
@@ -12967,9 +12967,9 @@ redisplay_internal (void)
     update_mode_lines++;
 
   /* Detect case that we need to write or remove a star in the mode line.  */
-  if ((SAVE_MODIFF < MODIFF) != !NILP (w->last_had_star))
+  if ((SAVE_MODIFF < MODIFF) != w->last_had_star)
     {
-      w->update_mode_line = Qt;
+      w->update_mode_line = 1;
       if (buffer_shared > 1)
         update_mode_lines++;
     }
@@ -12986,7 +12986,7 @@ redisplay_internal (void)
            && XFASTINT (w->last_modified) >= MODIFF
            && XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF)
       && (XFASTINT (w->column_number_displayed) != current_column ()))
-    w->update_mode_line = Qt;
+    w->update_mode_line = 1;
 
   unbind_to (count1, Qnil);
 
@@ -13089,7 +13089,7 @@ redisplay_internal (void)
   tlendpos = this_line_end_pos;
   if (!consider_all_windows_p
       && CHARPOS (tlbufpos) > 0
-      && NILP (w->update_mode_line)
+      && !w->update_mode_line
       && !current_buffer->clip_changed
       && !current_buffer->prevent_redisplay_optimizations_p
       && FRAME_VISIBLE_P (XFRAME (w->frame))
@@ -13097,8 +13097,8 @@ redisplay_internal (void)
       /* Make sure recorded data applies to current buffer, etc.  */
       && this_line_buffer == current_buffer
       && current_buffer == XBUFFER (w->buffer)
-      && NILP (w->force_start)
-      && NILP (w->optional_new_start)
+      && !w->force_start
+      && !w->optional_new_start
       /* Point must be on the line that we have info recorded about.  */
       && PT >= CHARPOS (tlbufpos)
       && PT <= Z - CHARPOS (tlendpos)
@@ -13633,7 +13633,7 @@ mark_window_display_accurate_1 (struct window *w, int accurate_p)
       w->last_overlay_modified
         = make_number (accurate_p ? BUF_OVERLAY_MODIFF (b) : 0);
       w->last_had_star
-        = BUF_MODIFF (b) > BUF_SAVE_MODIFF (b) ? Qt : Qnil;
+        = BUF_MODIFF (b) > BUF_SAVE_MODIFF (b);
 
       if (accurate_p)
         {
@@ -13662,7 +13662,7 @@ mark_window_display_accurate_1 (struct window *w, int accurate_p)
   if (accurate_p)
     {
       w->window_end_valid = w->buffer;
-      w->update_mode_line = Qnil;
+      w->update_mode_line = 0;
     }
 }
 
@@ -15291,7 +15291,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
   reconsider_clip_changes (w, buffer);
 
   /* Has the mode line to be updated?  */
-  update_mode_line = (!NILP (w->update_mode_line)
+  update_mode_line = (w->update_mode_line
                       || update_mode_lines
                       || buffer->clip_changed
                       || buffer->prevent_redisplay_optimizations_p);
@@ -15463,32 +15463,31 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
 
   /* If someone specified a new starting point but did not insist,
      check whether it can be used.  */
-  if (!NILP (w->optional_new_start)
+  if (w->optional_new_start
       && CHARPOS (startp) >= BEGV
       && CHARPOS (startp) <= ZV)
     {
-      w->optional_new_start = Qnil;
+      w->optional_new_start = 0;
       start_display (&it, w, startp);
       move_it_to (&it, PT, 0, it.last_visible_y, -1,
                   MOVE_TO_POS | MOVE_TO_X | MOVE_TO_Y);
       if (IT_CHARPOS (it) == PT)
-        w->force_start = Qt;
+        w->force_start = 1;
       /* IT may overshoot PT if text at PT is invisible.  */
       else if (IT_CHARPOS (it) > PT && CHARPOS (startp) <= PT)
-        w->force_start = Qt;
+        w->force_start = 1;
     }
 
  force_start:
 
   /* Handle case where place to start displaying has been specified,
      unless the specified location is outside the accessible range.  */
-  if (!NILP (w->force_start)
-      || w->frozen_window_start_p)
+  if (w->force_start || w->frozen_window_start_p)
     {
       /* We set this later on if we have to adjust point.  */
       int new_vpos = -1;
 
-      w->force_start = Qnil;
+      w->force_start = 0;
       w->vscroll = 0;
       w->window_end_valid = Qnil;
 
@@ -15507,7 +15506,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
           || ! NILP (Vwindow_scroll_functions))
         {
           update_mode_line = 1;
-          w->update_mode_line = Qt;
+          w->update_mode_line = 1;
           startp = run_window_scroll_functions (window, startp);
         }
 
@@ -15525,7 +15524,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
          the scroll margin (bug#148) -- cyd  */
       if (!try_window (window, startp, 0))
         {
-          w->force_start = Qt;
+          w->force_start = 1;
           clear_glyph_matrix (w->desired_matrix);
           goto need_larger_matrices;
         }
@@ -15604,7 +15603,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
     }
   /* If current starting point was originally the beginning of a line
      but no longer is, find a new starting point.  */
-  else if (!NILP (w->start_at_line_beg)
+  else if (w->start_at_line_beg
            && !(CHARPOS (startp) <= BEGV
                 || FETCH_BYTE (BYTEPOS (startp) - 1) == '\n'))
     {
@@ -15651,7 +15650,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
          new window start, since that would change the position under
          the mouse, resulting in an unwanted mouse-movement rather
          than a simple mouse-click.  */
-      if (NILP (w->start_at_line_beg)
+      if (!w->start_at_line_beg
           && NILP (do_mouse_tracking)
           && CHARPOS (startp) > BEGV
           && CHARPOS (startp) > BEG + beg_unchanged
@@ -15671,7 +15670,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
              See bug#9324.  */
           && pos_visible_p (w, PT, &d1, &d2, &d3, &d4, &d5, &d6))
         {
-          w->force_start = Qt;
+          w->force_start = 1;
           SET_TEXT_POS_FROM_MARKER (startp, w->start);
           goto force_start;
         }
@@ -15732,7 +15731,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
   if (!update_mode_line)
     {
       update_mode_line = 1;
-      w->update_mode_line = Qt;
+      w->update_mode_line = 1;
     }
 
   /* Try to scroll by specified few lines.  */
@@ -15987,9 +15986,8 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
  done:
 
   SET_TEXT_POS_FROM_MARKER (startp, w->start);
-  w->start_at_line_beg = ((CHARPOS (startp) == BEGV
-                           || FETCH_BYTE (BYTEPOS (startp) - 1) == '\n')
-                          ? Qt : Qnil);
+  w->start_at_line_beg = (CHARPOS (startp) == BEGV
+                            || FETCH_BYTE (BYTEPOS (startp) - 1) == '\n');
 
   /* Display the mode line, if we must.  */
   if ((update_mode_line
@@ -16206,7 +16204,7 @@ try_window (Lisp_Object window, struct text_pos pos, int flags)
   /* If bottom moved off end of frame, change mode line percentage.  */
   if (XFASTINT (w->window_end_pos) <= 0
       && Z != IT_CHARPOS (it))
-    w->update_mode_line = Qt;
+    w->update_mode_line = 1;
 
   /* Set window_end_pos to the offset of the last character displayed
      on the window from the end of current_buffer.  Set
diff --git a/src/xfns.c b/src/xfns.c
index 1f1d3d3ef0c..b8ea9137a75 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -1207,7 +1207,7 @@ x_set_menu_bar_lines (struct frame *f, Lisp_Object value, Lisp_Object oldval)
       FRAME_EXTERNAL_MENU_BAR (f) = 1;
       if (FRAME_X_P (f) && f->output_data.x->menubar_widget == 0)
         /* Make sure next redisplay shows the menu bar.  */
-        XWINDOW (FRAME_SELECTED_WINDOW (f))->update_mode_line = Qt;
+        XWINDOW (FRAME_SELECTED_WINDOW (f))->update_mode_line = 1;
     }
   else
     {