* dispnew.c (clear_glyph_row, copy_row_except_pointers):

Prefer signed to unsigned integers where either will do.
No need for 'const' on locals that do not escape.
Omit easserts with unnecessary and unportable assumptions about
alignment.  Avoid unnecessary casts to char *.

src/ChangeLog

+2013-09-24  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* dispnew.c (clear_glyph_row, copy_row_except_pointers):
+	Prefer signed to unsigned integers where either will do.
+	No need for 'const' on locals that do not escape.
+	Omit easserts with unnecessary and unportable assumptions about
+	alignment.  Avoid unnecessary casts to char *.
+
 2013-09-24  Dmitry Antipov  <dmantipov@yandex.ru>
 
 	Use union for the payload of struct Lisp_Vector.

src/dispnew.c

@@ -838,11 +838,10 @@ clear_window_matrices (struct window *w, bool desired_p)
 void
 clear_glyph_row (struct glyph_row *row)
 {
-  const size_t off = offsetof (struct glyph_row, used);
+  int off = offsetof (struct glyph_row, used);
 
-  eassert (off == sizeof row->glyphs);
   /* Zero everything except pointers in `glyphs'.  */
-  memset ((char *) row + off, 0, sizeof *row - off);
+  memset (row->used, 0, sizeof *row - off);
 }
 
 
@@ -989,10 +988,9 @@ swap_glyph_pointers (struct glyph_row *a, struct glyph_row *b)
 static void
 copy_row_except_pointers (struct glyph_row *to, struct glyph_row *from)
 {
-  const size_t off = offsetof (struct glyph_row, x);
+  int off = offsetof (struct glyph_row, x);
 
-  eassert (off == sizeof to->glyphs + sizeof to->used + sizeof to->hash);
-  memcpy ((char *) to + off, (char *) from + off, sizeof *to - off);
+  memcpy (&to->x, &from->x, sizeof *to - off);
 }