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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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31
apps/plugins/midi/synth.h
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@ -16,20 +16,37 @@
* KIND, either express or implied.
*
****************************************************************************/
int initSynth(struct MIDIfile * mf, char * filename, char * drumConfig);
signed short int synthVoice(struct SynthObject * so);
void setPoint(struct SynthObject * so, int pt);
static inline void synthSample(int * mixL, int * mixR)
{
register int dL=0;
register int dR=0;
register short sample=0;
register struct SynthObject *voicept=voices;
struct SynthObject *lastvoice=&voices[MAX_VOICES];
int i;
register int dL=0;
register int dR=0;
register short sample = 0;
register struct SynthObject *voicept=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)
{