Jeremy Fitzhardinge f595ec964d common implementation of iterative div/mod ...

We have a few instances of the open-coded iterative div/mod loop, used
when we don't expcet the dividend to be much bigger than the divisor.
Unfortunately modern gcc's have the tendency to strength "reduce" this
into a full mod operation, which isn't necessarily any faster, and
even if it were, doesn't exist if gcc implements it in libgcc.

The workaround is to put a dummy asm statement in the loop to prevent
gcc from performing the transformation.

This patch creates a single implementation of this loop, and uses it
to replace the open-coded versions I know about.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Cc: Christian Kujau <lists@nerdbynature.de>
Cc: Robert Hancock <hancockr@shaw.ca>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2008-06-12 10:47:56 +02:00

..

lzo

lzo: fix typo in decompressor

2008-04-10 15:34:05 -07:00

reed_solomon

lib: Remove unnecessary inclusions of asm/semaphore.h

2008-04-18 22:17:17 -04:00

zlib_deflate

lib/: Spelling fixes

2008-02-03 17:48:52 +02:00

zlib_inflate

[ZLIB]: Fix external builds of zlib_inflate code.

2007-10-11 22:17:20 -07:00

.gitignore

Add some basic .gitignore files

2005-10-18 08:26:15 -07:00

argv_split.c

LIB: Replace inappropriate include of <linux/bug.h>

2007-10-20 00:26:10 +02:00

audit.c

[PATCH] audit signal recipients

2007-05-11 05:38:25 -04:00

bitmap.c

cpumask: remove bitmap_scnprintf_len and cpumask_scnprintf_len

2008-05-13 08:02:25 -07:00

bitrev.c

lib: export bitrev16

2008-06-06 11:29:10 -07:00

bug.c

generic bug: use show_regs() instead of dump_stack()

2007-07-16 09:05:51 -07:00

bust_spinlocks.c

handle recursive calls to bust_spinlocks()

2007-10-17 08:42:56 -07:00

check_signature.c

uninline check_signature()

2007-07-16 09:05:50 -07:00

cmdline.c

[PATCH] Numerous fixes to kernel-doc info in source files.

2007-02-11 10:51:32 -08:00

cpumask.c

Safer nr_node_ids and nr_node_ids determination and initial values

2007-05-07 12:12:51 -07:00

crc7.c

CRC7 support

2007-07-17 10:23:04 -07:00

crc16.c

[PATCH] kernel-doc for lib/crc*.c

2006-06-25 10:01:20 -07:00

crc32.c

lib/: Spelling fixes

2008-02-03 17:48:52 +02:00

crc32defs.h

Linux-2.6.12-rc2

2005-04-16 15:20:36 -07:00

crc-ccitt.c

[PATCH] kernel-doc for lib/crc*.c

2006-06-25 10:01:20 -07:00

crc-itu-t.c

CRC ITU-T V.41

2007-05-10 18:24:13 +02:00

ctype.c

Linux-2.6.12-rc2

2005-04-16 15:20:36 -07:00

debug_locks.c

[PATCH] lockdep: better lock debugging

2006-07-03 15:27:01 -07:00

debugobjects.c

infrastructure to debug (dynamic) objects

2008-04-30 08:29:53 -07:00

dec_and_lock.c

[PATCH] atomic: dec_and_lock use atomic primitives

2006-01-08 20:13:48 -08:00

devres.c

[POWERPC] devres: Add devm_ioremap_prot()

2008-05-05 16:47:14 +10:00

div64.c

common implementation of iterative div/mod

2008-06-12 10:47:56 +02:00

dump_stack.c

Linux-2.6.12-rc2

2005-04-16 15:20:36 -07:00

extable.c

lib/extable.c: remove an expensive integer divide in search_extable()

2008-02-06 10:41:08 -08:00

fault-inject.c

libfs: allow error return from simple attributes

2008-02-08 09:22:34 -08:00

find_next_bit.c

bitops: remove "optimizations"

2008-04-29 08:11:16 -07:00

gen_crc32table.c

Linux-2.6.12-rc2

2005-04-16 15:20:36 -07:00

genalloc.c

Slab allocators: Replace explicit zeroing with __GFP_ZERO

2007-07-17 10:23:02 -07:00

halfmd4.c

Linux-2.6.12-rc2

2005-04-16 15:20:36 -07:00

hexdump.c

lib: create common ascii hex array

2008-05-14 19:11:14 -07:00

hweight.c

remove asm/bitops.h includes

2007-10-19 11:53:41 -07:00

idr.c

idr: fix idr_remove()

2008-05-01 08:04:00 -07:00

inflate.c

lib/inflate.c: handle failed malloc()

2008-04-29 08:06:02 -07:00

int_sqrt.c

[PATCH] lib: Fix bug in int_sqrt() for 64 bit longs

2006-02-03 08:32:08 -08:00

iomap_copy.c

[PATCH] add __iowrite64_copy

2006-06-20 20:24:58 -07:00

iomap.c

iomap: fix 64 bits resources on 32 bits

2008-04-29 08:06:02 -07:00

iommu-helper.c

iommu: export iommu_is_span_boundary helper function

2008-03-04 16:35:17 -08:00

ioremap.c

lib/ioremap.c should #include <linux/io.h>

2007-10-17 08:42:50 -07:00

irq_regs.c

[PATCH] irq_reqs: export __irq_regs

2006-10-06 08:53:40 -07:00

kasprintf.c

lib: move kasprintf to a separate file

2007-07-31 15:39:39 -07:00

Kconfig

x86, bitops: select the generic bitmap search functions

2008-04-26 19:21:17 +02:00

Kconfig.debug

debugobjects: add timer specific object debugging code

2008-04-30 08:29:53 -07:00

Kconfig.kgdb

kgdb: kconfig fix xconfig/menuconfig element

2008-05-05 07:13:21 -05:00

kernel_lock.c

BKL: revert back to the old spinlock implementation

2008-05-10 20:58:02 -07:00

klist.c

klist: fix coding style errors in klist.h and klist.c

2008-04-30 16:52:58 -07:00

kobject_uevent.c

lib: replace remaining __FUNCTION__ occurrences

2008-04-30 08:29:54 -07:00

kobject.c

kobject: do not copy vargs, just pass them around

2008-04-30 16:52:48 -07:00

kref.c

kref: add kref_set()

2008-01-24 20:40:05 -08:00

libcrc32c.c

[LIB] crc32c: Keep intermediate crc state in cpu order

2007-11-08 21:34:09 +08:00

list_debug.c

[PATCH] More list debugging context

2006-12-07 08:39:35 -08:00

lmb.c

lmb: Fix compile warning

2008-05-18 23:35:43 -05:00

locking-selftest-hardirq.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-mutex.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-rlock-hardirq.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-rlock-softirq.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-rlock.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-rsem.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-softirq.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-spin-hardirq.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-spin-softirq.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-spin.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-wlock-hardirq.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-wlock-softirq.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-wlock.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest-wsem.h

[PATCH] lockdep: locking API self tests

2006-07-03 15:27:03 -07:00

locking-selftest.c

[PATCH] lockdep: show more details about self-test failures

2006-12-07 08:39:43 -08:00

Makefile

infrastructure to debug (dynamic) objects

2008-04-30 08:29:53 -07:00

parser.c

add match_strlcpy() us it to make v9fs make uname and remotename parsing more robust

2008-05-14 19:23:25 -05:00

percpu_counter.c

mm: bdi: export BDI attributes in sysfs

2008-04-30 08:29:49 -07:00

plist.c

[PATCH] pi-futex: add plist implementation

2006-06-27 17:32:46 -07:00

prio_heap.c

Fix cpusets update_cpumask

2007-10-19 11:53:41 -07:00

prio_tree.c

Linux-2.6.12-rc2

2005-04-16 15:20:36 -07:00

proportions.c

mm: bdi: allow setting a maximum for the bdi dirty limit

2008-04-30 08:29:50 -07:00

radix-tree.c

Remove set_migrateflags()

2008-04-28 08:58:17 -07:00

random32.c

[NET]: srandom32 fixes for networking v2

2008-04-03 14:07:02 -07:00

ratelimit.c

isolate ratelimit from printk.c for other use

2008-04-29 08:06:06 -07:00

rbtree.c

[PATCH] rbtree: fixed reversed RB_EMPTY_NODE and rb_next/prev

2006-09-30 20:26:56 +02:00

reciprocal_div.c

[PATCH] SLAB: use a multiply instead of a divide in obj_to_index()

2006-12-13 09:05:49 -08:00

rwsem-spinlock.c

lib: remove fastcall from lib/*

2008-02-08 09:22:31 -08:00

rwsem.c

x86: fix UML and -regparm=3

2008-01-30 13:33:00 +01:00

scatterlist.c

[SCSI] block: add sg buffer copy helper functions

2008-04-07 12:15:45 -05:00

sha1.c

[PATCH] Numerous fixes to kernel-doc info in source files.

2007-02-11 10:51:32 -08:00

smp_processor_id.c

debug_smp_processor_id() fixlets

2008-02-06 10:41:09 -08:00

sort.c

lib/sort.c optimization

2007-10-17 08:42:52 -07:00

spinlock_debug.c

Use helpers to obtain task pid in printks

2007-10-19 11:53:43 -07:00

string.c

Add a new sysfs_streq() string comparison function

2008-05-01 08:03:59 -07:00

swiotlb.c

dma/ia64: update ia64 machvecs, swiotlb.c

2008-04-29 08:06:12 -07:00

textsearch.c

[TEXTSEARCH]: Do not allow zero length patterns in the textsearch infrastructure

2007-12-01 00:03:52 +11:00

ts_bm.c

[TEXTSEARCH]: Fix Boyer Moore initialization bug

2006-08-22 14:33:58 -07:00

ts_fsm.c

[PATCH] lib/ts_fsm.c: constify structs

2006-09-29 09:18:23 -07:00

ts_kmp.c

Remove obsolete #include <linux/config.h>

2006-06-30 19:25:36 +02:00

vsprintf.c

lib/vsprintf.c: fix bug omitting minus sign of numbers (module_param)

2008-02-23 17:12:14 -08:00