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DecodeRCU.cpp
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DecodeRCU.cpp
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#include "basetypes.h"
#include "mpe.h"
#include "Handlers.h"
#include "InstructionCache.h"
#include "InstructionDependencies.h"
#define decOnlyFlags 0
#define addrFlags 0
#define addrOnlyFlags 0
#define mvrFlags 0
#define mvrOnlyFlags 0
#define rangeFlags 0
#define rangeOnlyFlags 0
#define moduloFlags 0
#define moduloOnlyFlags 0
void MPE::DecodeInstruction_RCU16(const uint8 *const iPtr, InstructionCacheEntry * const entry, uint32 * const immExt)
{
entry->packetInfo |= PACKETINFO_RCU;
//copy dec control bits
const uint8 decInfo = *(iPtr + 1) & 0x03;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_INFO)] = decInfo;
switch(decInfo)
{
case 0:
//shouldnt happen
break;
case 1:
//RC1 only
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_DECRc1;
entry->miscInputDependencies[SLOT_RCU] |= (DEPENDENCY_MASK_RC1 | DEPENDENCY_FLAG_C1Z);
entry->miscOutputDependencies[SLOT_RCU] |= (DEPENDENCY_MASK_RC1 | DEPENDENCY_FLAG_C1Z);
break;
case 2:
//RC0 only
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_DECRc0;
entry->miscInputDependencies[SLOT_RCU] |= (DEPENDENCY_MASK_RC0 | DEPENDENCY_FLAG_C0Z);
entry->miscOutputDependencies[SLOT_RCU] |= (DEPENDENCY_MASK_RC0 | DEPENDENCY_FLAG_C0Z);
break;
case 3:
//both RC1 and RC0
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_DECBoth;
entry->miscInputDependencies[SLOT_RCU] |= (DEPENDENCY_MASK_RC0 | DEPENDENCY_MASK_RC1 | DEPENDENCY_FLAG_C0Z | DEPENDENCY_FLAG_C1Z);
entry->miscOutputDependencies[SLOT_RCU] |= (DEPENDENCY_MASK_RC0 | DEPENDENCY_MASK_RC1 | DEPENDENCY_FLAG_C0Z | DEPENDENCY_FLAG_C1Z);
break;
}
if((*iPtr == 0xF9) && (*(iPtr + 1) & 0x04))
{
entry->packetInfo |= decOnlyFlags;
//DEC RC0, DEC RC1 or both
*immExt = 0;
return;
}
//src is 0x03E0
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)] = ((*iPtr & 0x03) << 3) | (*(iPtr + 1) >> 5);
//dest is 0x0018
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_DEST)] = (*(iPtr + 1) >> 3) & 0x03;
//calculate remaining bits
if((*iPtr & 0x7C) == 0x74)
{
if(*(iPtr + 1) & 0x04)
{
//addr #(n<<16), RI or addr #nnnn, RI
if(*immExt)
{
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)] = ((*immExt & ~0xFFFF) << 5) | (entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)] << 16) | (*immExt & 0xFFFF);
}
else
{
//convert five bit immediate to signed 16.16 fixed point
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)] = ((int32)(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)] << 27)) >> 11;
}
if(decInfo == 0)
{
entry->packetInfo |= addrOnlyFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_ADDRImmediateOnly;
}
else
{
entry->packetInfo |= addrFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_ADDRImmediate;
}
entry->miscInputDependencies[SLOT_RCU] |= INDEX_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_DEST)]);
entry->miscOutputDependencies[SLOT_RCU] |= INDEX_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_DEST)]);
}
else
{
//addr Si, RI
if(decInfo == 0)
{
entry->packetInfo |= addrOnlyFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_ADDRScalarOnly;
}
else
{
entry->packetInfo |= addrFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_ADDRScalar;
}
entry->scalarInputDependencies[SLOT_RCU] |= SCALAR_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)]);
entry->miscInputDependencies[SLOT_RCU] |= INDEX_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_DEST)]);
entry->miscOutputDependencies[SLOT_RCU] |= INDEX_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_DEST)]);
}
}
else
{
if(*immExt)
{
//mvr #nnnn, RI
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)] = ((*immExt & ~0xFFFF) << 5) | (entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)] << 16) | (*immExt & 0xFFFF);
if(decInfo == 0)
{
entry->packetInfo |= mvrOnlyFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_MVRImmediateOnly;
}
else
{
entry->packetInfo |= mvrFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_MVRImmediate;
}
entry->miscOutputDependencies[SLOT_RCU] |= INDEX_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_DEST)]);
}
else if((*(iPtr + 1) & 0x04) == 0)
{
//mvr Sj, RI
if(decInfo == 0)
{
entry->packetInfo |= mvrOnlyFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_MVRScalarOnly;
}
else
{
entry->packetInfo |= mvrFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_MVRScalar;
}
entry->scalarInputDependencies[SLOT_RCU] |= SCALAR_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)]);
entry->miscOutputDependencies[SLOT_RCU] |= INDEX_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_DEST)]);
}
else
{
//modulo RI or range RI
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)] = entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_DEST)];
const uint32 rangeDependency = entry->nuances[FIXED_FIELD(SLOT_RCU, FIELD_RCU_DEST)] <= 1 ? DEPENDENCY_MASK_XYRANGE : DEPENDENCY_MASK_UVRANGE; // (0,1) : (2,3)
entry->miscInputDependencies[SLOT_RCU] |= (INDEX_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_SRC)]) | rangeDependency);
if(*iPtr & 0x02)
{
//Range
entry->miscOutputDependencies[SLOT_RCU] |= (DEPENDENCY_FLAG_MODMI | DEPENDENCY_FLAG_MODGE);
if(decInfo == 0)
{
entry->packetInfo |= rangeOnlyFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_RangeOnly;
}
else
{
entry->packetInfo |= rangeFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_Range;
}
}
else
{
//Modulo
entry->miscOutputDependencies[SLOT_RCU] |= (DEPENDENCY_FLAG_MODMI | DEPENDENCY_FLAG_MODGE | INDEX_REG_DEPENDENCY_MASK(entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_DEST)]));
if(decInfo == 0)
{
entry->packetInfo |= moduloOnlyFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_ModuloOnly;
}
else
{
entry->packetInfo |= moduloFlags;
entry->nuances[FIXED_FIELD(SLOT_RCU,FIELD_RCU_HANDLER)] = Handler_Modulo;
}
}
}
}
}