diff options
| author | Henri Beauchamp <sldevel@users.noreply.github.com> | 2023-01-31 17:42:51 +0100 |
|---|---|---|
| committer | Andrey Kleshchev <andreykproductengine@lindenlab.com> | 2023-01-31 22:04:14 +0200 |
| commit | 473ade269628d1fb6cbc7b96a91e1c0aec1b8e59 (patch) | |
| tree | 5e3347164dbffdb8c73b9a58c94fff75eb221aac /autobuild.xml | |
| parent | c154f4f6da10df693cbe15e0fe291d5b3c423d32 (diff) | |
SL-19110 Fast hashing classes for use in place of the slow LLMD5, where speed matters. (#64)
This commit adds the HBXX64 and HBXX128 classes for use as a drop-in
replacement for the slow LLMD5 hashing class, where speed matters and
backward compatibility (with standard hashing algorithms) and/or
cryptographic hashing qualities are not required.
It also replaces LLMD5 with HBXX* in a few existing hot (well, ok, just
"warm" for some) paths meeting the above requirements, while paving the way for
future use cases, such as in the DRTVWR-559 and sibling branches where the slow
LLMD5 is used (e.g. to hash materials and vertex buffer cache entries), and
could be use such a (way) faster algorithm with very significant benefits and
no negative impact.
Here is the comment I added in indra/llcommon/hbxx.h:
// HBXXH* classes are to be used where speed matters and cryptographic quality
// is not required (no "one-way" guarantee, though they are likely not worst in
// this respect than MD5 which got busted and is now considered too weak). The
// xxHash code they are built upon is vectorized and about 50 times faster than
// MD5. A 64 bits hash class is also provided for when 128 bits of entropy are
// not needed. The hashes collision rate is similar to MD5's.
// See https://github.com/Cyan4973/xxHash#readme for details.
Diffstat (limited to 'autobuild.xml')
| -rw-r--r-- | autobuild.xml | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/autobuild.xml b/autobuild.xml index f749b20b5e..67c9b84af2 100644 --- a/autobuild.xml +++ b/autobuild.xml @@ -2928,6 +2928,36 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string> <key>version</key> <string>0.54.1.555529</string> </map> + <key>xxhash</key> + <map> + <key>copyright</key> + <string>Copyright 2012-2020 Yann Collet</string> + <key>description</key> + <string>xxHash Extremely fast hash algorithm</string> + <key>license</key> + <string>bsd</string> + <key>license_file</key> + <string>LICENSES/xxhash.txt</string> + <key>name</key> + <string>xxhash</string> + <key>platforms</key> + <map> + <key>common</key> + <map> + <key>archive</key> + <map> + <key>hash</key> + <string>f54f21dda4ce25b112f0cc7b4ce38bba</string> + <key>url</key> + <string>http://sldev.free.fr/libraries/xxhash-0.8.1-20230124.tar.bz2</string> + </map> + <key>name</key> + <string>common</string> + </map> + </map> + <key>version</key> + <string>0.8.1</string> + </map> <key>zlib-ng</key> <map> <key>canonical_repo</key> |