Make synthVoice return int instead of short, gives a nice speed up also add a comment

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14988 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 5 insertions, 3 deletions

diff --git a/apps/plugins/midi/synth.c b/apps/plugins/midi/synth.c
index 322d0f792d..327f32e288 100644
--- a/apps/plugins/midi/synth.c
+++ b/apps/plugins/midi/synth.c
@@ -255,8 +255,8 @@ inline void stopVoice(struct SynthObject * so)
     so->decay = 0;
 }
 
-signed short int synthVoice(struct SynthObject * so) ICODE_ATTR;
-signed short int synthVoice(struct SynthObject * so)
+int synthVoice(struct SynthObject * so) ICODE_ATTR;
+int synthVoice(struct SynthObject * so)
 {
     struct GWaveform * wf;
     register int s;
diff --git a/apps/plugins/midi/synth.h b/apps/plugins/midi/synth.h
index 2b7187e819..dd52c40a7d 100644
--- a/apps/plugins/midi/synth.h
+++ b/apps/plugins/midi/synth.h
@@ -17,7 +17,7 @@
  *
  ****************************************************************************/
 int initSynth(struct MIDIfile * mf, char * filename, char * drumConfig);
-signed short int synthVoice(struct SynthObject * so);
+int synthVoice(struct SynthObject * so);
 void setPoint(struct SynthObject * so, int pt);
 
 static inline void synthSample(int * mixL, int * mixR)
@@ -48,6 +48,8 @@ static inline void synthSample(int * mixL, int * mixR)
         voicept++;
     }
 
+    /* if max voices is an even number gcc is smart enough to not
+       include this loop */
     for(i=MAX_VOICES%2; i > 0; i--)
     {
         if(voicept->isUsed==1)