From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 20 Nov 2011 03:19:22 +0000 (-0800)
Subject: Standardize on VIRT_ADDR_VARIES behavior.
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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.
---

aead30b5ae76af1aa8dfd440ba0a7a40f4e15c77
diff --cc src/ChangeLog
index fb5eef08b7f,5424e5b938b..acf2bb83e2b
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@@ -1,3 -1,22 +1,23 @@@
+ 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
++	Standardize on VIRT_ADDR_VARIES behavior (Bug#10042).
++	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)