busybox.git/libbb/Config.src, branch master

shell: update HISTFILESIZE code to be actually useful

2025-07-03T17:10:42+00:00

"HISTFILESIZE=0" in profile wasn't working as intended,
"unset HISTFILE" wasn't preventing creation of history files
Now:
HISTSIZE=n      allows to reduce in-memory history buffer
HISTFILESIZE=n  allows to reduce history file size (0: truncate it)
unset HISTFILE  allows to not save history file at all

function                                             old     new   delta
exitshell                                            138     194     +56
hush_exit                                             97     143     +46
save_history                                         266     296     +30
hush_main                                           1170    1186     +16
.rodata                                           105762  105771      +9
load_history                                         246     254      +8
size_from_HISTFILESIZE                                44      41      -3
read_line_input                                     2746    2712     -34
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 6/2 up/down: 165/-37)           Total: 128 bytes

Signed-off-by: Denys Vlasenko

loop: optionally use ioctl(LOOP_CONFIGURE) to set up loopdevs

2022-12-13T14:21:28+00:00

LOOP_CONFIGURE is added to Linux 5.8

function                                             old     new   delta
NO_LOOP_CONFIGURE (old code):
set_loop                                             784     782      -2
LOOP_CONFIGURE:
set_loop                                             784     653    -131
TRY_LOOP_CONFIGURE:
set_loop                                             784     811     +27

Based on a patch by Xiaoming Ni 

Signed-off-by: Denys Vlasenko

libbb/sha1: update config help text with new performance numbers

2022-02-18T16:09:51+00:00

Signed-off-by: Denys Vlasenko

libbb/sha256: optional x86 hardware accelerated hashing

2022-02-03T13:58:02+00:00

64 bit:
function                                             old     new   delta
sha256_process_block64_shaNI                           -     730    +730
.rodata                                           108314  108586    +272
sha256_begin                                          31      83     +52
------------------------------------------------------------------------------
(add/remove: 5/1 grow/shrink: 2/0 up/down: 1055/-1)          Total: 1054 bytes

32 bit:
function                                             old     new   delta
sha256_process_block64_shaNI                           -     747    +747
.rodata                                           104318  104590    +272
sha256_begin                                          29      84     +55
------------------------------------------------------------------------------
(add/remove: 5/1 grow/shrink: 2/0 up/down: 1075/-1)          Total: 1074 bytes

Signed-off-by: Denys Vlasenko

libbb/sha1: optional x86-64 hardware accelerates hashing

2022-01-06T23:43:59+00:00

function                                             old     new   delta
sha1_process_block64_shaNI                             -     510    +510
sha1_begin                                            52     107     +55
.rodata                                           108285  108301     +16
static.shaNI                                           -       1      +1
------------------------------------------------------------------------------
(add/remove: 4/0 grow/shrink: 2/0 up/down: 582/0)             Total: 582 bytes

Signed-off-by: Denys Vlasenko

libbb/sha1: x86_64 version: generate from a script, optimize a bit

2022-01-03T12:10:30+00:00

function                                             old     new   delta
sha1_process_block64                                3569    3502     -67

Signed-off-by: Denys Vlasenko

libbb/sha1: x86_64 version: bswap in 64-bit chunks

2022-01-01T14:42:15+00:00

function                                             old     new   delta
sha1_process_block64                                3562    3570      +8

Signed-off-by: Denys Vlasenko

libbb/sha1: shrink x86_64 version - use r8..15 for W[8..15]

2022-01-01T14:01:53+00:00

function                                             old     new   delta
sha1_process_block64                                3683    3562    -121

Signed-off-by: Denys Vlasenko

libbb/sha1: assembly versions for x86

2022-01-01T12:57:34+00:00

32 bits:
function                                             old     new   delta
sha1_process_block64                                3950    3657    -293
64 bits:
sha1_process_block64                                4167    3683    -484

Signed-off-by: Denys Vlasenko

libbb/sha1: shrink and speed up fully unrolled version

2021-12-31T16:07:47+00:00

function                                             old     new   delta
sha1_process_block64                                4149    3950    -199

Signed-off-by: Denys Vlasenko