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author Couriersud <couriersud@users.noreply.github.com>2010-01-27 23:57:17 +0000
committer Couriersud <couriersud@users.noreply.github.com>2010-01-27 23:57:17 +0000
commit9dae23fc0ed01375d69b433c4afb2e1678ed005c (patch)
treed756f1f0787329a9a8f1094354b86e9aec411e07
parent77cc6538e1473543a39f5292f246a17f7162827b (diff)
Small optimization, no credit
-rw-r--r--src/emu/sound/disc_flt.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/src/emu/sound/disc_flt.c b/src/emu/sound/disc_flt.c
index a5c296f87ef..2eb880e2568 100644
--- a/src/emu/sound/disc_flt.c
+++ b/src/emu/sound/disc_flt.c
@@ -1180,21 +1180,22 @@ static DISCRETE_STEP(dst_rcfilter_sw)
int i;
int bits = (int)DST_RCFILTER_SW__SWITCH;
double us = 0;
+ double vIn = DST_RCFILTER_SW__VIN;
- if (DST_RCFILTER_SW__ENABLE)
+ if (EXPECTED(DST_RCFILTER_SW__ENABLE))
{
switch (bits)
{
case 0:
- node->output[0] = DST_RCFILTER_SW__VIN;
+ node->output[0] = vIn;
break;
case 1:
- context->vCap[0] += (DST_RCFILTER_SW__VIN - context->vCap[0]) * context->exp0;
- node->output[0] = context->vCap[0] + (DST_RCFILTER_SW__VIN - context->vCap[0]) * context->factor;
+ context->vCap[0] += (vIn - context->vCap[0]) * context->exp0;
+ node->output[0] = context->vCap[0] + (vIn - context->vCap[0]) * context->factor;
break;
case 2:
- context->vCap[1] += (DST_RCFILTER_SW__VIN - context->vCap[1]) * context->exp1;
- node->output[0] = context->vCap[1] + (DST_RCFILTER_SW__VIN - context->vCap[1]) * context->factor;
+ context->vCap[1] += (vIn - context->vCap[1]) * context->exp1;
+ node->output[0] = context->vCap[1] + (vIn - context->vCap[1]) * context->factor;
break;
default:
for (i = 0; i < 4; i++)
@@ -1202,7 +1203,7 @@ static DISCRETE_STEP(dst_rcfilter_sw)
if (( bits & (1 << i)) != 0)
us += context->vCap[i];
}
- node->output[0] = context->f1[bits] * DST_RCFILTER_SW__VIN + context->f2[bits] * us;
+ node->output[0] = context->f1[bits] * vIn + context->f2[bits] * us;
for (i = 0; i < 4; i++)
{
if (( bits & (1 << i)) != 0)