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Merge pull request #92 from jSTE0/microopt

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Autechre 2022-02-23 02:53:07 +01:00 committed by GitHub
commit abd072aa37
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4 changed files with 54 additions and 28 deletions
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2
source/dsp1.c
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@ -352,7 +352,7 @@ void DSP1SetByte(uint8_t byte, uint16_t address)
Op11m = (int16_t)(DSP1.parameters [0] | (DSP1.parameters[1] << 8));
Op11Zr = (int16_t)(DSP1.parameters [2] | (DSP1.parameters[3] << 8));
Op11Yr = (int16_t)(DSP1.parameters [4] | (DSP1.parameters[5] << 8));
Op11Xr = (int16_t)(DSP1.parameters [7] | (DSP1.parameters[7] << 8));
Op11Xr = (int16_t)(DSP1.parameters [6] | (DSP1.parameters[7] << 8));
DSPOp11();
break;
case 0x25:

41
source/dsp1emu.c
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@ -187,11 +187,19 @@ void DSP1_Inverse(int16_t Coefficient, int16_t Exponent, int16_t* iCoefficient,
}
/* Step Three: Normalize */
#ifdef __GNUC__
{
const int shift = __builtin_clz(Coefficient) - (8 * sizeof(int) - 15);
Coefficient <<= shift;
Exponent -= shift;
}
#else
while (Coefficient < 0x4000)
{
Coefficient <<= 1;
Exponent--;
}
#endif
/* Step Four: Special Case */
if (Coefficient == 0x4000)
@ -336,9 +344,18 @@ int16_t DSP1_Cos(int16_t Angle)
void DSP1_Normalize(int16_t m, int16_t* Coefficient, int16_t* Exponent)
{
int16_t i = 0x4000;
int16_t e = 0;
#ifdef __GNUC__
int16_t n = m < 0 ? ~m : m;
if (n == 0)
e = 15;
else
e = __builtin_clz(n) - (8 * sizeof(int) - 15);
#else
int16_t i = 0x4000;
if (m < 0)
{
while ((m & i) && i)
@ -355,6 +372,7 @@ void DSP1_Normalize(int16_t m, int16_t* Coefficient, int16_t* Exponent)
e++;
}
}
#endif
if (e > 0)
*Coefficient = m * DSP1ROM[0x21 + e] << 1;
@ -368,9 +386,18 @@ void DSP1_NormalizeDouble(int32_t Product, int16_t* Coefficient, int16_t* Expone
{
int16_t n = Product & 0x7fff;
int16_t m = Product >> 15;
int16_t i = 0x4000;
int16_t e = 0;
#ifdef __GNUC__
int16_t t = m < 0 ? ~m : m;
if (t == 0)
e = 15;
else
e = __builtin_clz(t) - (8 * sizeof(int) - 15);
#else
int16_t i = 0x4000;
if (m < 0)
{
while ((m & i) && i)
@ -387,6 +414,7 @@ void DSP1_NormalizeDouble(int32_t Product, int16_t* Coefficient, int16_t* Expone
e++;
}
}
#endif
if (e > 0)
{
@ -396,6 +424,14 @@ void DSP1_NormalizeDouble(int32_t Product, int16_t* Coefficient, int16_t* Expone
*Coefficient += n * DSP1ROM[0x0040 - e] >> 15;
else
{
#ifdef __GNUC__
t = m < 0 ? ~(n | 0x8000) : n;
if (t == 0)
e += 15;
else
e += __builtin_clz(t) - (8 * sizeof(int) - 15);
#else
i = 0x4000;
if (m < 0)
@ -414,6 +450,7 @@ void DSP1_NormalizeDouble(int32_t Product, int16_t* Coefficient, int16_t* Expone
e++;
}
}
#endif
if (e > 15)
*Coefficient = n * DSP1ROM[0x0012 + e] << 1;

37
source/fxemu.c
View File

@ -2,6 +2,7 @@
#include "fxemu.h"
#include "fxinst.h"
#include "memmap.h"
#include <stdlib.h>
#include <string.h>
@ -30,33 +31,27 @@ void fx_updateRamBank(uint8_t Byte)
static INLINE void fx_readRegisterSpaceForCheck(void)
{
R15 = GSU.pvRegisters[30];
R15 |= ((uint32_t) GSU.pvRegisters[31]) << 8;
R15 = (uint32_t) READ_WORD(&GSU.pvRegisters[30]);
}
static void fx_readRegisterSpaceForUse(void)
{
static uint32_t avHeight[] = { 128, 160, 192, 256 };
static uint32_t avMult[] = { 16, 32, 32, 64 };
static const uint32_t avHeight[] = { 128, 160, 192, 256 };
static const uint32_t avMult[] = { 16, 32, 32, 64 };
int32_t i;
uint8_t* p = GSU.pvRegisters;
/* Update R0 - R14 */
for (i = 0; i < 15; i++)
{
GSU.avReg[i] = *p++;
GSU.avReg[i] += ((uint32_t)(*p++)) << 8;
}
for (i = 0; i < 15; i++, p += 2)
GSU.avReg[i] = (uint32_t) READ_WORD(p);
/* Update other registers */
p = GSU.pvRegisters;
GSU.vStatusReg = (uint32_t) GSU.pvRegisters[GSU_SFR];
GSU.vStatusReg |= ((uint32_t) GSU.pvRegisters[GSU_SFR + 1]) << 8;
GSU.vStatusReg = (uint32_t) READ_WORD(&GSU.pvRegisters[GSU_SFR]);
GSU.vPrgBankReg = (uint32_t) GSU.pvRegisters[GSU_PBR];
GSU.vRomBankReg = (uint32_t)p[GSU_ROMBR];
GSU.vRamBankReg = ((uint32_t)p[GSU_RAMBR]) & (FX_RAM_BANKS - 1);
GSU.vCacheBaseReg = (uint32_t)p[GSU_CBR];
GSU.vCacheBaseReg |= ((uint32_t)p[GSU_CBR + 1]) << 8;
GSU.vCacheBaseReg = (uint32_t) READ_WORD(&p[GSU_CBR]);
/* Update status register variables */
GSU.vZero = !(GSU.vStatusReg & FLG_Z);
@ -146,19 +141,15 @@ void fx_computeScreenPointers(void)
static INLINE void fx_writeRegisterSpaceAfterCheck(void)
{
GSU.pvRegisters[30] = (uint8_t) R15;
GSU.pvRegisters[31] = (uint8_t) (R15 >> 8);
WRITE_WORD(&GSU.pvRegisters[30], R15);
}
static void fx_writeRegisterSpaceAfterUse(void)
{
int32_t i;
uint8_t* p = GSU.pvRegisters;
for (i = 0; i < 15; i++)
{
*p++ = (uint8_t)GSU.avReg[i];
*p++ = (uint8_t)(GSU.avReg[i] >> 8);
}
for (i = 0; i < 15; i++, p += 2)
WRITE_WORD(p, GSU.avReg[i]);
/* Update status register */
if (USEX16(GSU.vZero) == 0)
@ -179,13 +170,11 @@ static void fx_writeRegisterSpaceAfterUse(void)
CF(CY);
p = GSU.pvRegisters;
p[GSU_SFR] = (uint8_t) GSU.vStatusReg;
p[GSU_SFR + 1] = (uint8_t) (GSU.vStatusReg >> 8);
WRITE_WORD(&p[GSU_SFR], GSU.vStatusReg);
p[GSU_PBR] = (uint8_t) GSU.vPrgBankReg;
p[GSU_ROMBR] = (uint8_t)GSU.vRomBankReg;
p[GSU_RAMBR] = (uint8_t)GSU.vRamBankReg;
p[GSU_CBR] = (uint8_t)GSU.vCacheBaseReg;
p[GSU_CBR + 1] = (uint8_t)(GSU.vCacheBaseReg >> 8);
WRITE_WORD(&p[GSU_CBR], GSU.vCacheBaseReg);
}
/* Reset the FxChip */

2
source/gfx.c
View File

@ -423,7 +423,7 @@ void S9xStartScreenRefresh(void)
GFX.Delta = (GFX.SubScreen - GFX.Screen) >> 1;
}
if (++IPPU.FrameCount % Memory.ROMFramesPerSecond == 0)
if (++IPPU.FrameCount == (uint32_t)Memory.ROMFramesPerSecond)
IPPU.FrameCount = 0;
}