+2011-11-20 Paul Eggert <eggert@cs.ucla.edu>
+
+ Standardize on VIRT_ADDR_VARIES behavior; otherwise, valgrind
+ does not work on some platforms. Problem reported by Andreas Schwab in
+ <http://lists.gnu.org/archive/html/emacs-devel/2011-11/msg00081.html>.
+ * puresize.h (pure, PURE_P): Always behave as if VIRT_ADDR_VARIES
+ is set, removing the need for VIRT_ADDRESS_VARIES.
+ (PURE_P): Use a more-efficient implementation that needs just one
+ comparison, not two: on x86-64 with GCC 4.6.2, this cut down the
+ number of instructions from 6 (xorl, cmpq, jge, xorl, cmpq, setge)
+ to 4 (xorl, subq, cmpq, setbe).
+ * alloc.c (pure): Always extern now, since that's the
+ VIRT_ADDR_VARIES behavior.
+ (PURE_POINTER_P): Use a single comparison, not two, for
+ consistency with the new puresize.h.
+ * lisp.h (PNTR_COMPARISON_TYPE): Remove; no longer needed.
+ * m/ibms390.h, m/intel386.h, m/template.h, s/cygwin.h, s/hpux10-20.h:
+ Remove VIRT_ADDR_VARIES no longer needed.
+
2011-11-19 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (x_write_glyphs, draw_phys_cursor_glyph)