[PATCH] * lib/xalloc.h (DEFAULT_MXFAST): Track 64-bit glibc.

[Paul Eggert]

This is a performance improvement for 64-bit hosts: it causes the
value of DEFAULT_MXFAST to track what's in glibc on such hosts.
---
 ChangeLog    |    6 ++++++
 lib/xalloc.h |    6 +++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 596656e..056c9a8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-07-31  Paul Eggert  <address@hidden>
+
+       * lib/xalloc.h (DEFAULT_MXFAST): Track 64-bit glibc.
+       This is a performance improvement for 64-bit hosts: it causes the
+       value of DEFAULT_MXFAST to track what's in glibc on such hosts.
+
 2011-07-31  Bruno Haible  <address@hidden>
 
        stdioext: Add support for Minix.
diff --git a/lib/xalloc.h b/lib/xalloc.h
index b792aef..987791b 100644
--- a/lib/xalloc.h
+++ b/lib/xalloc.h
@@ -192,9 +192,9 @@ x2nrealloc (void *p, size_t *pn, size_t s)
         {
           /* The approximate size to use for initial small allocation
              requests, when the invoking code specifies an old size of
-             zero.  64 bytes is the largest "small" request for the
-             GNU C library malloc.  */
-          enum { DEFAULT_MXFAST = 64 };
+             zero.  This is the largest "small" request for the GNU C
+             library malloc.  */
+          enum { DEFAULT_MXFAST = 64 * sizeof (size_t) / 4 };
 
           n = DEFAULT_MXFAST / s;
           n += !n;
-- 
1.7.4.4