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Update ym2612.c

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[Core/YM2612] minor optimizations
This commit is contained in:
ekeeke 2017-09-27 13:58:22 +02:00 committed by GitHub
parent 1f0af7e5a8
commit e2774c7b8a
1 changed files with 6 additions and 6 deletions
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12
core/sound/ym2612.c
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@ -1285,7 +1285,7 @@ INLINE void update_ssg_eg_channels(FM_CH *CH)
INLINE void update_phase_lfo_slot(FM_SLOT *SLOT, UINT32 pm, UINT8 kc, UINT32 fc)
{
INT32 lfo_fn_offset = lfo_pm_table[(((fc & 0x7f0) >> 4) << 8) + pm];
INT32 lfo_fn_offset = lfo_pm_table[((fc & 0x7f0) << 4) + pm];
if (lfo_fn_offset) /* LFO phase modulation active */
{
@ -1296,7 +1296,7 @@ INLINE void update_phase_lfo_slot(FM_SLOT *SLOT, UINT32 pm, UINT8 kc, UINT32 fc)
fc = ((fc << 1) + lfo_fn_offset) & 0xfff;
/* (frequency) phase increment counter (17-bit) */
fc = (((fc << 5) >> (7 - blk)) + SLOT->DT[kc]) & DT_MASK;
fc = (((fc << blk) >> 2) + SLOT->DT[kc]) & DT_MASK;
/* update phase */
SLOT->phase += ((fc * SLOT->mul) >> 1);
@ -1311,7 +1311,7 @@ INLINE void update_phase_lfo_channel(FM_CH *CH)
{
UINT32 fc = CH->block_fnum;
INT32 lfo_fn_offset = lfo_pm_table[(((fc & 0x7f0) >> 4) << 8) + CH->pms + ym2612.OPN.LFO_PM];
INT32 lfo_fn_offset = lfo_pm_table[((fc & 0x7f0) << 4) + CH->pms + ym2612.OPN.LFO_PM];
if (lfo_fn_offset) /* LFO phase modulation active */
{
@ -1325,7 +1325,7 @@ INLINE void update_phase_lfo_channel(FM_CH *CH)
fc = ((fc << 1) + lfo_fn_offset) & 0xfff;
/* (frequency) phase increment counter (17-bit) */
fc = (fc << 5) >> (7 - blk);
fc = (fc << blk) >> 2;
/* apply DETUNE & MUL operator specific values */
finc = (fc + CH->SLOT[SLOT1].DT[kc]) & DT_MASK;
@ -1699,7 +1699,7 @@ INLINE void OPNWriteReg(int r, int v)
/* keyscale code */
CH->kcode = (blk<<2) | opn_fktable[fn >> 7];
/* phase increment counter */
CH->fc = (fn << 6) >> (7 - blk);
CH->fc = (fn<<blk)>>1;
/* store fnum in clear form for LFO PM calculations */
CH->block_fnum = (blk<<11) | fn;
@ -1718,7 +1718,7 @@ INLINE void OPNWriteReg(int r, int v)
/* keyscale code */
ym2612.OPN.SL3.kcode[c]= (blk<<2) | opn_fktable[fn >> 7];
/* phase increment counter */
ym2612.OPN.SL3.fc[c] = (fn << 6) >> (7 - blk);
ym2612.OPN.SL3.fc[c] = (fn<<blk)>>1;
ym2612.OPN.SL3.block_fnum[c] = (blk<<11) | fn;
ym2612.CH[2].SLOT[SLOT1].Incr=-1;
}