void ApuE0()
{
// CLRV
APUClearHalfCarry();
APUClearOverflow();
IAPU.PC++;
}
// XXX: HalfCarry - BJ Fixed? Or is it between bits 7 and 8 for ADDW/SUBW?
void Apu7A()
{
// ADDW YA,dp
uint16_t Work16 = S9xAPUGetByteZ(OP1) + (S9xAPUGetByteZ(OP1 + 1) << 8);
uint32_t Work32 = (uint32_t) IAPU.Registers.YA.W + Work16;
IAPU._Carry = Work32 >= 0x10000;
if (~(IAPU.Registers.YA.W ^ Work16) & (Work16 ^ (uint16_t) Work32) & 0x8000)
APUSetOverflow();
else
APUClearOverflow();
APUClearHalfCarry();
if ((IAPU.Registers.YA.W ^ Work16 ^ (uint16_t) Work32) & 0x10)
APUSetHalfCarry();
IAPU.Registers.YA.W = (uint16_t) Work32;
APUSetZN16(IAPU.Registers.YA.W);
IAPU.PC += 2;
}
void Apu9E()
{
// DIV YA,X
if (IAPU.Registers.X == 0)
{
APUSetOverflow();
IAPU.Registers.YA.B.Y = 0xff;
IAPU.Registers.YA.B.A = 0xff;
}
else
{
APUClearOverflow();
uint8_t Work8 = IAPU.Registers.YA.W / IAPU.Registers.X;
IAPU.Registers.YA.B.Y = IAPU.Registers.YA.W % IAPU.Registers.X;
IAPU.Registers.YA.B.A = Work8;
}
// XXX How should Overflow, Half Carry, Zero and Negative flags be set??
// APUSetZN16 (IAPU.Registers.YA.W);
APUSetZN8(IAPU.Registers.YA.B.A);
IAPU.PC++;
}
// XXX: BJ: i think the old HalfCarry behavior was wrong...
// XXX: Or is it between bits 7 and 8 for ADDW/SUBW?
// XXX: Used Work32 instead of Int32 before. Fixed? [Neb]
void Apu9A()
{
// SUBW YA,dp
uint16_t Work16 = S9xAPUGetByteZ(OP1) + (S9xAPUGetByteZ(OP1 + 1) << 8);
int32_t Int32 = (long) IAPU.Registers.YA.W - (long) Work16;
APUClearHalfCarry();
IAPU._Carry = Int32 >= 0;
if (((IAPU.Registers.YA.W ^ Work16) & 0x8000) &&
((IAPU.Registers.YA.W ^ (uint16_t) Int32) & 0x8000))
APUSetOverflow();
else
APUClearOverflow();
if (((IAPU.Registers.YA.W ^ Work16) & 0x0080) &&
((IAPU.Registers.YA.W ^ (uint16_t) Int32) & 0x0080))
APUSetHalfCarry();
APUSetHalfCarry();
if ((IAPU.Registers.YA.W ^ Work16 ^ (uint16_t) Int32) & 0x10)
APUClearHalfCarry();
IAPU.Registers.YA.W = (uint16_t) Int32;
APUSetZN16(IAPU.Registers.YA.W);
IAPU.PC += 2;
}
// XXX: BJ: i think the old HalfCarry behavior was wrong...
// XXX: Or is it between bits 7 and 8 for ADDW/SUBW?
void Apu9A()
{
// SUBW YA,dp
uint16 Work16 = S9xAPUGetByteZ(OP1) + (S9xAPUGetByteZ(OP1 + 1) << 8);
long Int32 = (long) IAPU.YA.W - (long) Work16;
APUClearHalfCarry();
IAPU._Carry = Int32 >= 0;
if (((IAPU.YA.W ^ Work16) & 0x8000) &&
((IAPU.YA.W ^ (uint16) Int32) & 0x8000))
APUSetOverflow();
else
APUClearOverflow();
// if (((IAPU.YA.W ^ Work16) & 0x0080) &&
// ((IAPU.YA.W ^ (uint16) Int32) & 0x0080))
// APUSetHalfCarry (); // notaz: strange here
APUSetHalfCarry();
// if((IAPU.YA.W ^ Work16 ^ (uint16) Work32) & 0x10) // notaz: Work32?!
if ((IAPU.YA.W ^ Work16 ^ (uint16) Int32) & 0x10)
APUClearHalfCarry();
IAPU.YA.W = (uint16) Int32;
APUSetZN16(IAPU.YA.W);
IAPU.PC += 2;
}