Changeset a876958d in ffmpeg

Timestamp:

Jun 3, 2017, 1:00:35 AM (8 years ago)

Author:

Sean McGovern <gseanmcg@gmail.com>

Branches:

master

Children:

60ed9b70, f960fd2f

Parents:

61cec5ad

git-author:

James Almer <jamrial@gmail.com> (03/03/17 03:25:54)

git-committer:

Sean McGovern <gseanmcg@gmail.com> (06/03/17 01:00:35)

Message:

avutil/md5: fix misaligned reads

This makes ubsan happy and also considerably increases performance on
big endian systems.

Tested on an IBM POWER7 3.55 GHz

Before:

2.24user 0.14system 0:02.39elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
2.26user 0.11system 0:02.38elapsed 99%CPU (0avgtext+0avgdata 2688maxresident)k
2.23user 0.15system 0:02.38elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
2.25user 0.12system 0:02.38elapsed 100%CPU (0avgtext+0avgdata 2624maxresident)k
2.20user 0.15system 0:02.36elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k

After:

1.86user 0.13system 0:02.00elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
1.89user 0.11system 0:02.01elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
1.85user 0.14system 0:02.00elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
1.84user 0.15system 0:01.99elapsed 99%CPU (0avgtext+0avgdata 2624maxresident)k
1.89user 0.13system 0:02.02elapsed 99%CPU (0avgtext+0avgdata 2688maxresident)k

Tested-by: Nicolas George <​george@nsup.org>
Reviewed-by: Michael Niedermayer <​michael@niedermayer.cc>
Signed-off-by: James Almer <​jamrial@gmail.com>
Signed-off-by: Sean McGovern <​gseanmcg@gmail.com>

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