diff options
| author | fbarchard@google.com <fbarchard@google.com@0039d316-1c4b-4281-b951-d872f2087c98> | 2012-04-12 02:17:30 +0000 |
|---|---|---|
| committer | fbarchard@google.com <fbarchard@google.com@0039d316-1c4b-4281-b951-d872f2087c98> | 2012-04-12 02:17:30 +0000 |
| commit | 2b0964296cf3381b36e9fd342199a990adb458bc (patch) | |
| tree | 07e1c0982db51b26a8e745d982b6ee6643de6ea7 /media | |
| parent | 65d12044f78bd469b507d89703bd3067267a94b3 (diff) | |
| download | chromium_src-2b0964296cf3381b36e9fd342199a990adb458bc.zip chromium_src-2b0964296cf3381b36e9fd342199a990adb458bc.tar.gz chromium_src-2b0964296cf3381b36e9fd342199a990adb458bc.tar.bz2 | |
hash code cleanup - copy seed to local and use array indexing. 1.483 ms for 720p vs 2.225 ms for old code.
BUG=none
TEST=none
Review URL: https://chromiumcodereview.appspot.com/10052036
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@131901 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'media')
| -rw-r--r-- | media/base/djb2.cc | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/media/base/djb2.cc b/media/base/djb2.cc index 3f790ed..8d47ed2 100644 --- a/media/base/djb2.cc +++ b/media/base/djb2.cc @@ -1,16 +1,14 @@ -// Copyright (c) 2009 The Chromium Authors. All rights reserved. +// Copyright (c) 2012 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "media/base/djb2.h" -uint32 DJB2Hash(const void* buf, size_t len, uint32 hash) { - const uint8* s = reinterpret_cast<const uint8*>(buf); - if (len > 0) { - do { - hash = hash * 33 + *s++; - } while (--len); +uint32 DJB2Hash(const void* buf, size_t len, uint32 seed) { + const uint8* src = reinterpret_cast<const uint8*>(buf); + uint32 hash = seed; + for (size_t i = 0; i < len; ++i) { + hash = hash * 33 + src[i]; } return hash; } - |