commit 879bc64e43d62f2690c77a3282cef2e45d1b76e9
author Glenn Kasten <gkasten@google.com> Mon Jan 09 10:25:00 2012 -0800
committer Android (Google) Code Review <android-gerrit@google.com> Mon Jan 09 10:25:00 2012 -0800
tree 40952192d397dcff30df01558c68c11ef675cb7f
parent 5c7b3bcc88e2b472f1f7b416d89222714b96a567
parent 98dd542ffcd3424b1da58bd273c0c1ff5b8c8960

Merge "Replace loop by __builtin_ctz"

services/audioflinger/AudioMixer.cpp

diff --git a/services/audioflinger/AudioMixer.cpp b/services/audioflinger/AudioMixer.cpp
index 36cdeb8..bc5cb9b 100644
--- a/services/audioflinger/AudioMixer.cpp
+++ b/services/audioflinger/AudioMixer.cpp
@@ -95,16 +95,11 @@
 
 int AudioMixer::getTrackName()
 {
-    uint32_t names = mTrackNames;
-    uint32_t mask = 1;
-    int n = 0;
-    while (names & mask) {
-        mask <<= 1;
-        n++;
-    }
-    if (mask) {
+    uint32_t names = ~mTrackNames;
+    if (names != 0) {
+        int n = __builtin_ctz(names);
         ALOGV("add track (%d)", n);
-        mTrackNames |= mask;
+        mTrackNames |= 1 << n;
         return TRACK0 + n;
     }
     return -1;