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Unroll a frequently executed loop a little for a small speedup

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14924 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Nils Wallménius 2007-09-30 19:22:57 +00:00
parent 035529c487
commit f9664e7e87
1 changed files with 24 additions and 7 deletions
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23
apps/plugins/midi/synth.h
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@ -16,20 +16,37 @@
* KIND, either express or implied. * KIND, either express or implied.
* *
****************************************************************************/ ****************************************************************************/
int initSynth(struct MIDIfile * mf, char * filename, char * drumConfig); int initSynth(struct MIDIfile * mf, char * filename, char * drumConfig);
signed short int synthVoice(struct SynthObject * so); signed short int synthVoice(struct SynthObject * so);
void setPoint(struct SynthObject * so, int pt); void setPoint(struct SynthObject * so, int pt);
static inline void synthSample(int * mixL, int * mixR) static inline void synthSample(int * mixL, int * mixR)
{ {
int i;
register int dL=0; register int dL=0;
register int dR=0; register int dR=0;
register short sample = 0; register short sample = 0;
register struct SynthObject *voicept=voices; register struct SynthObject *voicept=voices;
struct SynthObject *lastvoice=&voices[MAX_VOICES];
while(voicept!=lastvoice) for(i=MAX_VOICES/2; i > 0; i--)
{
if(voicept->isUsed==1)
{
sample = synthVoice(voicept);
dL += (sample*chPanLeft[voicept->ch])>>7;
dR += (sample*chPanRight[voicept->ch])>>7;
}
voicept++;
if(voicept->isUsed==1)
{
sample = synthVoice(voicept);
dL += (sample*chPanLeft[voicept->ch])>>7;
dR += (sample*chPanRight[voicept->ch])>>7;
}
voicept++;
}
for(i=MAX_VOICES%2; i > 0; i--)
{ {
if(voicept->isUsed==1) if(voicept->isUsed==1)
{ {