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don't try and outsmart the compiler on constant multplies

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This commit is contained in:
Josh Coalson
2001-05-14 21:31:50 +00:00
parent c59638ea49
commit b787e2afeb
1 changed files with 27 additions and 0 deletions
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27
src/libFLAC/fixed.c
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@@ -154,6 +154,7 @@ void FLAC__fixed_compute_residual(const int32 data[], unsigned data_len, unsigne
{
unsigned i;
#if 0
switch(order) {
case 0:
for(i = 0; i < data_len; i++) {
@@ -186,6 +187,32 @@ void FLAC__fixed_compute_residual(const int32 data[], unsigned data_len, unsigne
default:
assert(0);
}
#else
switch(order) {
case 0:
for(i = 0; i < data_len; i++)
residual[i] = data[i];
break;
case 1:
for(i = 0; i < data_len; i++)
residual[i] = data[i] - data[i-1];
break;
case 2:
for(i = 0; i < data_len; i++)
residual[i] = data[i] - 2*data[i-1] + data[i-2];
break;
case 3:
for(i = 0; i < data_len; i++)
residual[i] = data[i] - 3*data[i-1] + 3*data[i-2] - data[i-3];
break;
case 4:
for(i = 0; i < data_len; i++)
residual[i] = data[i] - 4*data[i-1] + 6*data[i-2] - 4*data[i-3] + data[i-4];
break;
default:
assert(0);
}
#endif
}
void FLAC__fixed_restore_signal(const int32 residual[], unsigned data_len, unsigned order, int32 data[])