Bob Pearson 0292c497b6 crc32: optimize loop counter for x86 ... Add two changes that improve the performance of x86 systems 1. replace main loop with incrementing counter this change improves the performance of the selftest by about 5-6% on Nehalem CPUs. The apparent reason is that the compiler can use the loop index to perform an indexed memory access. This is reported to make the performance of PowerPC CPUs to get worse. 2. replace the rem_len loop with incrementing counter this change improves the performance of the selftest, which has more than the usual number of occurances, by about 1-2% on x86 CPUs. In actual work loads the length is most often a multiple of 4 bytes and this code does not get executed as often if at all. Again this change is reported to make the performance of PowerPC get worse. [djwong@us.ibm.com: Minor changelog tweaks] Signed-off-by: Bob Pearson <rpearson@systemfabricworks.com> Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-03-23 16:58:37 -07:00
..
lzo	…
mpi	lib: Fix 32-bit sparc udiv_qrnnd() definition in mpilib's longlong.h	2012-02-02 10:34:25 +11:00
raid6	md: Add in export.h for files using EXPORT_SYMBOL	2011-10-31 19:31:19 -04:00
reed_solomon	…
xz	XZ: Fix incorrect XZ_BUF_ERROR	2011-09-21 13:39:59 -07:00
zlib_deflate	…
zlib_inflate	…
.gitignore	…
Kconfig	crc32: simplify unit test code	2012-03-23 16:58:37 -07:00
Kconfig.debug	nmi watchdog: do not use cpp symbol in Kconfig	2012-03-23 16:58:31 -07:00
Kconfig.kgdb	…
Kconfig.kmemcheck	…
Makefile	lib: Fix multiple definitions of clz_tab	2012-02-02 10:34:23 +11:00
argv_split.c	…
atomic64.c	lib: atomic64: Change the type of local lock to raw_spinlock_t	2011-09-14 13:14:11 +02:00
atomic64_test.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
audit.c	…
average.c	…
bcd.c	…
bch.c	…
bitmap.c	lib/bitmap.c: quiet sparse noise about address space	2011-10-31 17:30:56 -07:00
bitrev.c	…
bsearch.c	…
btree.c	btree: export btree_get_prev() so modules can use btree_for_each	2012-01-10 16:30:49 -08:00
bug.c	bugs, x86: Fix printk levels for panic, softlockups and stack dumps	2012-01-26 21:28:45 +01:00
bust_spinlocks.c	…
check_signature.c	…
checksum.c	lib/checksum.c: optimize do_csum a bit	2011-07-07 04:52:24 -07:00
clz_tab.c	lib: Fix multiple definitions of clz_tab	2012-02-02 10:34:23 +11:00
cmdline.c	…
cordic.c	Docs: wording: functions -> algorithm	2011-10-29 21:20:22 +02:00
cpu-notifier-error-inject.c	…
cpu_rmap.c	…
cpumask.c	cpumask: alloc_cpumask_var() use NUMA_NO_NODE	2011-07-26 16:49:44 -07:00
crc-ccitt.c	…
crc-itu-t.c	…
crc-t10dif.c	…
crc7.c	…
crc8.c	…
crc16.c	…
crc32.c	crc32: optimize loop counter for x86	2012-03-23 16:58:37 -07:00
crc32defs.h	crc32: add slice-by-8 algorithm to existing code	2012-03-23 16:58:37 -07:00
ctype.c	…
debug_locks.c	…
debugobjects.c	debugobjects: Fix selftest for static warnings	2012-03-05 15:49:43 -08:00
dec_and_lock.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
decompress.c	…
decompress_bunzip2.c	decompress_bunzip2: remove invalid vi modeline	2011-12-06 10:00:05 +01:00
decompress_inflate.c	…
decompress_unlzma.c	treewide: Fix comment and string typo 'bufer'	2011-12-06 09:53:40 +01:00
decompress_unlzo.c	unlzo: fix input buffer free	2012-01-12 20:13:13 -08:00
decompress_unxz.c	…
devres.c	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci	2012-01-11 18:50:26 -08:00
digsig.c	lib/digsig: checks for NULL return value	2012-02-02 00:24:04 +11:00
div64.c	…
dma-debug.c	Remove useless get_driver()/put_driver() calls	2012-01-24 16:00:35 -08:00
dump_stack.c	…
dynamic_debug.c	dynamic_debug: process multiple debug-queries on a line	2012-01-24 12:50:36 -08:00
dynamic_queue_limits.c	dql: Fix undefined jiffies	2012-03-11 19:59:43 -07:00
extable.c	…
fault-inject.c	switch debugfs to umode_t	2012-01-03 22:54:56 -05:00
find_last_bit.c	…
find_next_bit.c	…
flex_array.c	…
gcd.c	…
gen_crc32table.c	crc32: add slice-by-8 algorithm to existing code	2012-03-23 16:58:37 -07:00
genalloc.c	lib, Make gen_pool memory allocator lockless	2011-08-03 11:15:57 -04:00
halfmd4.c	…
hexdump.c	lib: add error checking to hex2bin	2011-09-20 23:24:44 -04:00
hweight.c	…
idr.c	idr: make idr_get_next() good for rcu_read_lock()	2012-03-21 17:55:01 -07:00
inflate.c	…
int_sqrt.c	…
iomap.c	lib: add GENERIC_PCI_IOMAP	2011-11-28 21:12:42 +02:00
iomap_copy.c	…
iommu-helper.c	…
ioremap.c	…
irq_regs.c	…
is_single_threaded.c	…
kasprintf.c	…
klist.c	…
kobject.c	kobject: remove kset_find_obj_hinted()	2011-12-21 15:13:54 -08:00
kobject_uevent.c	uevent: send events in correct order according to seqnum (v3)	2012-03-08 12:56:40 -08:00
kstrtox.c	Reduce the number of expensive division instructions done by _parse_integer()	2012-02-09 10:09:30 -08:00
kstrtox.h	lib/kstrtox: common code between kstrto*() and simple_strto*() functions	2011-10-31 17:30:56 -07:00
lcm.c	lib/lcm.c: quiet sparse noise	2011-07-25 20:57:15 -07:00
libcrc32c.c	…
list_debug.c	…
list_sort.c	…
llist.c	llist: Remove cpu_relax() usage in cmpxchg loops	2011-10-04 12:44:03 +02:00
locking-selftest-hardirq.h	…
locking-selftest-mutex.h	…
locking-selftest-rlock-hardirq.h	…
locking-selftest-rlock-softirq.h	…
locking-selftest-rlock.h	…
locking-selftest-rsem.h	…
locking-selftest-softirq.h	…
locking-selftest-spin-hardirq.h	…
locking-selftest-spin-softirq.h	…
locking-selftest-spin.h	…
locking-selftest-wlock-hardirq.h	…
locking-selftest-wlock-softirq.h	…
locking-selftest-wlock.h	…
locking-selftest-wsem.h	…
locking-selftest.c	…
lru_cache.c	…
md5.c	crypto: Move md5_transform to lib/md5.c	2011-08-06 18:32:45 -07:00
nlattr.c	netlink: validate NLA_MSECS length	2011-11-04 17:47:34 -04:00
parser.c	…
pci_iomap.c	lib: add NO_GENERIC_PCI_IOPORT_MAP	2012-01-31 23:19:47 +02:00
percpu_counter.c	lib/percpu_counter.c: enclose hotplug only variables in hotplug ifdef	2011-10-31 17:30:56 -07:00
plist.c	plist: Remove the need to supply locks to plist heads	2011-07-08 14:02:53 +02:00
prio_heap.c	…
prio_tree.c	prio_tree: introduce prio_set_parent()	2012-03-23 16:58:36 -07:00
proportions.c	locking, lib/proportions: Annotate prop_local_percpu::lock as raw	2011-09-13 11:11:50 +02:00
radix-tree.c	radix_tree: take radix_tree_path off stack	2012-01-12 20:13:12 -08:00
random32.c	…
ratelimit.c	locking, printk: Annotate logbuf_lock as raw	2011-09-13 11:11:54 +02:00
rational.c	…
rbtree.c	…
reciprocal_div.c	sch_red: Adaptative RED AQM	2011-12-08 19:52:43 -05:00
rwsem-spinlock.c	locking, rwsem: Annotate inner lock as raw	2011-09-13 11:11:59 +02:00
rwsem.c	locking, rwsem: Annotate inner lock as raw	2011-09-13 11:11:59 +02:00
scatterlist.c	lib: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:27 +08:00
sha1.c	lib/sha1.c: quiet sparse noise about symbol not declared	2011-09-13 16:09:41 -07:00
show_mem.c	…
smp_processor_id.c	sched: Wrap scheduler p->cpus_allowed access	2011-10-06 12:46:56 +02:00
sort.c	…
spinlock_debug.c	lib/spinlock_debug.c: print owner on spinlock lockup	2011-10-31 17:30:56 -07:00
string.c	string: memchr_inv() speed improvements	2012-03-23 16:58:35 -07:00
string_helpers.c	…
swiotlb.c	lib: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:27 +08:00
syscall.c	…
test-kstrtox.c	…
textsearch.c	…
timerqueue.c	…
ts_bm.c	…
ts_fsm.c	…
ts_kmp.c	…
uuid.c	…
vsprintf.c	vsprintf: make %pV handling compatible with kasprintf()	2012-03-06 08:22:26 -08:00