[src/trunk]: src/libexec/ld.elf_so Don't use division since we are only deali...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ccbf23774e52
branches:  trunk
changeset: 765401:ccbf23774e52
user:      christos <christos%NetBSD.org@localhost>
date:      Wed May 25 14:41:46 2011 +0000

description:
Don't use division since we are only dealing with powers of 2.

diffstat:

 libexec/ld.elf_so/xmalloc.c |  10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diffs (50 lines):

diff -r 02a1983025fa -r ccbf23774e52 libexec/ld.elf_so/xmalloc.c
--- a/libexec/ld.elf_so/xmalloc.c       Wed May 25 14:11:36 2011 +0000
+++ b/libexec/ld.elf_so/xmalloc.c       Wed May 25 14:41:46 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: xmalloc.c,v 1.10 2010/12/03 23:07:49 joerg Exp $       */
+/*     $NetBSD: xmalloc.c,v 1.11 2011/05/25 14:41:46 christos Exp $    */
 
 /*
  * Copyright 1996 John D. Polstra.
@@ -77,7 +77,7 @@
 
 #include <sys/cdefs.h>
 #ifndef lint
-__RCSID("$NetBSD: xmalloc.c,v 1.10 2010/12/03 23:07:49 joerg Exp $");
+__RCSID("$NetBSD: xmalloc.c,v 1.11 2011/05/25 14:41:46 christos Exp $");
 #endif /* not lint */
 
 #include <stdlib.h>
@@ -148,6 +148,7 @@
 
 static size_t pagesz;                  /* page size */
 static size_t pagebucket;              /* page size bucket */
+static size_t pageshift;               /* page size shift */
 
 #ifdef MSTATS
 /*
@@ -203,6 +204,7 @@
                        bucket++;
                }
                pagebucket = bucket;
+               pageshift = ffs(pagesz) - 1;
        }
        /*
         * Convert amount of memory requested into closest block size
@@ -277,13 +279,13 @@
 #endif
        if (sz < pagesz) {
                amt = pagesz;
-               nblks = amt / sz;
+               nblks = amt >> (bucket + 3);
        } else {
                amt = sz + pagesz;
                nblks = 1;
        }
        if (amt > PAGEPOOL_SIZE)
-               if (morepages(amt/pagesz + NPOOLPAGES) == 0)
+               if (morepages((amt >> pageshift) + NPOOLPAGES) == 0)
                        return;
        op = (union overhead *)pagepool_start;
        pagepool_start += amt;