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libbb/sha1: add config-selectable fully unrolled version, closes 14391

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function                                             old     new   delta
sha1_process_block64                                 364    4167   +3803
static.rconsts                                        16       -     -16
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/0 up/down: 3803/-16)         Total: 3787 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2021-12-30 13:07:12 +01:00
parent 9173c9cce4
commit 25aadc893d
2 changed files with 95 additions and 14 deletions
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25
libbb/Config.src
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@@ -42,21 +42,32 @@ config MD5_SMALL
default 1 # all "fast or small" options default to small
range 0 3
help
Trade binary size versus speed for the md5sum algorithm.
Trade binary size versus speed for the md5 algorithm.
Approximate values running uClibc and hashing
linux-2.4.4.tar.bz2 were:
value user times (sec) text size (386)
0 (fastest) 1.1 6144
1 1.4 5392
2 3.0 5088
3 (smallest) 5.1 4912
value user times (sec) text size (386)
0 (fastest) 1.1 6144
1 1.4 5392
2 3.0 5088
3 (smallest) 5.1 4912
config SHA1_SMALL
int "SHA1: Trade bytes for speed (0:fast, 3:slow)"
default 3 # all "fast or small" options default to small
range 0 3
help
Trade binary size versus speed for the sha1 algorithm.
throughput MB/s size of sha1_process_block64
value 486 x86-64 486 x86-64
0 339 374 4149 4167
1,2,3 200 195 358 380
config SHA3_SMALL
int "SHA3: Trade bytes for speed (0:fast, 1:slow)"
default 1 # all "fast or small" options default to small
range 0 1
help
Trade binary size versus speed for the sha3sum algorithm.
Trade binary size versus speed for the sha3 algorithm.
SHA3_SMALL=0 compared to SHA3_SMALL=1 (approximate):
64-bit x86: +270 bytes of code, 45% faster
32-bit x86: +450 bytes of code, 75% faster