Ejemplo n.º 1
0
static void fpgen_rm_reg(m68ki_cpu_core *m68k, UINT16 w2)
{
	int ea = m68k->ir & 0x3f;
	int rm = (w2 >> 14) & 0x1;
	int src = (w2 >> 10) & 0x7;
	int dst = (w2 >>  7) & 0x7;
	int opmode = w2 & 0x7f;
	double source;

	if (rm)
	{
		switch (src)
		{
			case 0:		// Long-Word Integer
			{
				INT32 d = READ_EA_32(m68k, ea);
				source = (double)(d);
				break;
			}
			case 1:		// Single-precision Real
			{
				UINT32 d = READ_EA_32(m68k, ea);
				source = (double)(*(float*)&d);
				break;
			}
			case 2:		// Extended-precision Real
			{
				fatalerror("fpgen_rm_reg: extended-precision real load unimplemented at %08X\n", REG_PC-4);
				break;
			}
			case 3:		// Packed-decimal Real
			{
				fatalerror("fpgen_rm_reg: packed-decimal real load unimplemented at %08X\n", REG_PC-4);
				break;
			}
			case 4:		// Word Integer
			{
				INT16 d = READ_EA_16(m68k, ea);
				source = (double)(d);
				break;
			}
			case 5:		// Double-precision Real
			{
				UINT64 d = READ_EA_64(m68k, ea);
				source = *(double*)&d;
				break;
			}
			case 6:		// Byte Integer
			{
				INT8 d = READ_EA_8(m68k, ea);
				source = (double)(d);
				break;
			}
			default:	fatalerror("fmove_rm_reg: invalid source specifier at %08X\n", REG_PC-4);
		}
	}
	else
	{
		source = REG_FP[src].f;
	}

	switch (opmode)
	{
		case 0x00:		// FMOVE
		{
			REG_FP[dst].f = source;
			m68k->remaining_cycles -= 4;
			break;
		}
		case 0x04:		// FSQRT
		{
			REG_FP[dst].f = sqrt(source);
			SET_CONDITION_CODES(m68k, REG_FP[dst]);
			m68k->remaining_cycles -= 109;
			break;
		}
		case 0x18:		// FABS
		{
			REG_FP[dst].f = fabs(source);
			SET_CONDITION_CODES(m68k, REG_FP[dst]);
			m68k->remaining_cycles -= 3;
			break;
		}
		case 0x1a:		// FNEG
		{
			REG_FP[dst].f = -source;
			SET_CONDITION_CODES(m68k, REG_FP[dst]);
			m68k->remaining_cycles -= 3;
			break;
		}
		case 0x20:		// FDIV
		{
			REG_FP[dst].f /= source;
			m68k->remaining_cycles -= 43;
			break;
		}
		case 0x22:		// FADD
		{
			REG_FP[dst].f += source;
			SET_CONDITION_CODES(m68k, REG_FP[dst]);
			m68k->remaining_cycles -= 9;
			break;
		}
		case 0x23:		// FMUL
		{
			REG_FP[dst].f *= source;
			SET_CONDITION_CODES(m68k, REG_FP[dst]);
			m68k->remaining_cycles -= 11;
			break;
		}
		case 0x28:		// FSUB
		{
			REG_FP[dst].f -= source;
			SET_CONDITION_CODES(m68k, REG_FP[dst]);
			m68k->remaining_cycles -= 9;
			break;
		}
		case 0x38:		// FCMP
		{
			fp_reg res;
			res.f = REG_FP[dst].f - source;
			SET_CONDITION_CODES(m68k, res);
			m68k->remaining_cycles -= 7;
			break;
		}
		case 0x3a:		// FTST
		{
			fp_reg res;
			res.f = source;
			SET_CONDITION_CODES(m68k, res);
			m68k->remaining_cycles -= 7;
			break;
		}

		default:	fatalerror("fpgen_rm_reg: unimplemented opmode %02X at %08X\n", opmode, REG_PC-4);
	}
}
Ejemplo n.º 2
0
static void fpgen_rm_reg(UINT16 w2)
{
	int ea = REG_IR & 0x3f;
	int rm = (w2 >> 14) & 0x1;
	int src = (w2 >> 10) & 0x7;
	int dst = (w2 >>  7) & 0x7;
	int opmode = w2 & 0x7f;
	double source;

	if (rm)
	{
		switch (src)
		{
			case 0:		// Long-Word Integer
			{
				INT32 d = READ_EA_32(ea);
				source = (double)(d);
				break;
			}
			case 1:		// Single-precision Real
			{
				UINT32 d = READ_EA_32(ea);
				source = (double)(*(float*)&d);
				break;
			}
			case 2:		// Extended-precision Real
			{
				fatalerror("fpgen_rm_reg: extended-precision real load unimplemented at %08X\n", REG_PC-4);
				break;
			}
			case 3:		// Packed-decimal Real
			{
				fatalerror("fpgen_rm_reg: packed-decimal real load unimplemented at %08X\n", REG_PC-4);
				break;
			}
			case 4:		// Word Integer
			{
				INT16 d = READ_EA_16(ea);
				source = (double)(d);
				break;
			}
			case 5:		// Double-precision Real
			{
				UINT64 d = READ_EA_64(ea);
				source = *(double*)&d;
				break;
			}
			case 6:		// Byte Integer
			{
				INT8 d = READ_EA_8(ea);
				source = (double)(d);
				break;
			}
			default:	fatalerror("fmove_rm_reg: invalid source specifier at %08X\n", REG_PC-4);
		}
	}
	else
	{
		source = REG_FP[src].f;
	}

	switch (opmode)
	{
		case 0x00:		// FMOVE
		{
			REG_FP[dst].f = source;
			USE_CYCLES(4);
			break;
		}
		case 0x04:		// FSQRT
		{
			REG_FP[dst].f = sqrt(source);
			// TODO: condition codes
			USE_CYCLES(109);
			break;
		}
		case 0x18:		// FABS
		{
			REG_FP[dst].f = fabs(source);
			// TODO: condition codes
			USE_CYCLES(3);
			break;
		}
		case 0x1a:		// FNEG
		{
			REG_FP[dst].f = -source;
			// TODO: condition codes
			USE_CYCLES(3);
			break;
		}
		case 0x20:		// FDIV
		{
			REG_FP[dst].f /= source;
			USE_CYCLES(43);
			break;
		}
		case 0x22:		// FADD
		{
			REG_FP[dst].f += source;
			// TODO: condition codes
			USE_CYCLES(9);
			break;
		}
		case 0x23:		// FMUL
		{
			REG_FP[dst].f *= source;
			// TODO: condition codes
			USE_CYCLES(11);
			break;
		}
		case 0x28:		// FSUB
		{
			REG_FP[dst].f -= source;
			// TODO: condition codes
			USE_CYCLES(9);
			break;
		}
		case 0x38:		// FCMP
		{
			// TODO: condition codes !!!
			USE_CYCLES(7);
			break;
		}
		case 0x3a:		// FTST
		{
			// TODO: condition codes !!!
			USE_CYCLES(7);
			break;
		}

		default:	fatalerror("fpgen_rm_reg: unimplemented opmode %02X at %08X\n", opmode, REG_PC-4);
	}
}
Ejemplo n.º 3
0
static void fpgen_rm_reg(m68000_base_device *m68k, UINT16 w2)
{
	int ea = m68k->ir & 0x3f;
	int rm = (w2 >> 14) & 0x1;
	int src = (w2 >> 10) & 0x7;
	int dst = (w2 >>  7) & 0x7;
	int opmode = w2 & 0x7f;
	floatx80 source;

	// fmovecr #$f, fp0 f200 5c0f

	if (rm)
	{
		switch (src)
		{
			case 0:     // Long-Word Integer
			{
				INT32 d = READ_EA_32(m68k, ea);
				source = int32_to_floatx80(d);
				break;
			}
			case 1:     // Single-precision Real
			{
				UINT32 d = READ_EA_32(m68k, ea);
				source = float32_to_floatx80(d);
				break;
			}
			case 2:     // Extended-precision Real
			{
				source = READ_EA_FPE(m68k, ea);
				break;
			}
			case 3:     // Packed-decimal Real
			{
				source = READ_EA_PACK(m68k, ea);
				break;
			}
			case 4:     // Word Integer
			{
				INT16 d = READ_EA_16(m68k, ea);
				source = int32_to_floatx80((INT32)d);
				break;
			}
			case 5:     // Double-precision Real
			{
				UINT64 d = READ_EA_64(m68k, ea);

				source = float64_to_floatx80(d);
				break;
			}
			case 6:     // Byte Integer
			{
				INT8 d = READ_EA_8(m68k, ea);
				source = int32_to_floatx80((INT32)d);
				break;
			}
			case 7:     // FMOVECR load from constant ROM
			{
				switch (w2 & 0x7f)
				{
					case 0x0:   // Pi
						source.high = 0x4000;
						source.low = U64(0xc90fdaa22168c235);
						break;

					case 0xb:   // log10(2)
						source.high = 0x3ffd;
						source.low = U64(0x9a209a84fbcff798);
						break;

					case 0xc:   // e
						source.high = 0x4000;
						source.low = U64(0xadf85458a2bb4a9b);
						break;

					case 0xd:   // log2(e)
						source.high = 0x3fff;
						source.low = U64(0xb8aa3b295c17f0bc);
						break;

					case 0xe:   // log10(e)
						source.high = 0x3ffd;
						source.low = U64(0xde5bd8a937287195);
						break;

					case 0xf:   // 0.0
						source = int32_to_floatx80((INT32)0);
						break;

					case 0x30:  // ln(2)
						source.high = 0x3ffe;
						source.low = U64(0xb17217f7d1cf79ac);
						break;

					case 0x31:  // ln(10)
						source.high = 0x4000;
						source.low = U64(0x935d8dddaaa8ac17);
						break;

					case 0x32:  // 1 (or 100?  manuals are unclear, but 1 would make more sense)
						source = int32_to_floatx80((INT32)1);
						break;

					case 0x33:  // 10^1
						source = int32_to_floatx80((INT32)10);
						break;

					case 0x34:  // 10^2
						source = int32_to_floatx80((INT32)10*10);
						break;

					case 0x35:  // 10^4
						source = int32_to_floatx80((INT32)1000*10);
						break;

					case 0x36:  // 1.0e8
						source = int32_to_floatx80((INT32)10000000*10);
						break;

					case 0x37:  // 1.0e16 - can't get the right precision from INT32 so go "direct" with constants from h/w
						source.high = 0x4034;
						source.low = U64(0x8e1bc9bf04000000);
						break;

					case 0x38:  // 1.0e32
						source.high = 0x4069;
						source.low = U64(0x9dc5ada82b70b59e);
						break;

					case 0x39:  // 1.0e64
						source.high = 0x40d3;
						source.low = U64(0xc2781f49ffcfa6d5);
						break;

					case 0x3a:  // 1.0e128
						source.high = 0x41a8;
						source.low = U64(0x93ba47c980e98ce0);
						break;

					case 0x3b:  // 1.0e256
						source.high = 0x4351;
						source.low = U64(0xaa7eebfb9df9de8e);
						break;

					case 0x3c:  // 1.0e512
						source.high = 0x46a3;
						source.low = U64(0xe319a0aea60e91c7);
						break;

					case 0x3d:  // 1.0e1024
						source.high = 0x4d48;
						source.low = U64(0xc976758681750c17);
						break;

					case 0x3e:  // 1.0e2048
						source.high = 0x5a92;
						source.low = U64(0x9e8b3b5dc53d5de5);
						break;

					case 0x3f:  // 1.0e4096
						source.high = 0x7525;
						source.low = U64(0xc46052028a20979b);
						break;

					default:
						fatalerror("fmove_rm_reg: unknown constant ROM offset %x at %08x\n", w2&0x7f, REG_PC(m68k)-4);
						break;
				}

				// handle it right here, the usual opmode bits aren't valid in the FMOVECR case
				REG_FP(m68k)[dst] = source;
				m68k->remaining_cycles -= 4;
				return;
			}
			default:    fatalerror("fmove_rm_reg: invalid source specifier %x at %08X\n", src, REG_PC(m68k)-4);
		}
	}
	else
	{
		source = REG_FP(m68k)[src];
	}



	switch (opmode)
	{
		case 0x00:      // FMOVE
		{
			REG_FP(m68k)[dst] = source;
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 4;
			break;
		}
		case 0x01:      // FINT
		{
			INT32 temp;
			temp = floatx80_to_int32(source);
			REG_FP(m68k)[dst] = int32_to_floatx80(temp);
			break;
		}
		case 0x03:      // FINTRZ
		{
			INT32 temp;
			temp = floatx80_to_int32_round_to_zero(source);
			REG_FP(m68k)[dst] = int32_to_floatx80(temp);
			break;
		}
		case 0x04:      // FSQRT
		{
			REG_FP(m68k)[dst] = floatx80_sqrt(source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 109;
			break;
		}
		case 0x06:      // FLOGNP1
		{
			REG_FP(m68k)[dst] = floatx80_flognp1 (source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 594; // for MC68881
			break;
		}
		case 0x0e:      // FSIN
		{
			REG_FP(m68k)[dst] = source;
			floatx80_fsin(REG_FP(m68k)[dst]);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 75;
			break;
		}
		case 0x0f:      // FTAN
		{
			REG_FP(m68k)[dst] = source;
			floatx80_ftan(REG_FP(m68k)[dst]);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 75;
			break;
		}
		case 0x14:      // FLOGN
		{
			REG_FP(m68k)[dst] = floatx80_flogn (source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 548; // for MC68881
			break;
		}
		case 0x15:      // FLOG10
		{
			REG_FP(m68k)[dst] = floatx80_flog10 (source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 604; // for MC68881
			break;
		}
		case 0x16:      // FLOG2
		{
			REG_FP(m68k)[dst] = floatx80_flog2 (source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 604; // for MC68881
			break;
		}
		case 0x18:      // FABS
		{
			REG_FP(m68k)[dst] = source;
			REG_FP(m68k)[dst].high &= 0x7fff;
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 3;
			break;
		}
		case 0x1a:      // FNEG
		{
			REG_FP(m68k)[dst] = source;
			REG_FP(m68k)[dst].high ^= 0x8000;
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 3;
			break;
		}
		case 0x1d:      // FCOS
		{
			REG_FP(m68k)[dst] = source;
			floatx80_fcos(REG_FP(m68k)[dst]);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 75;
			break;
		}
		case 0x1e:      // FGETEXP
		{
			INT16 temp2;

			temp2 = source.high;    // get the exponent
			temp2 -= 0x3fff;    // take off the bias
			REG_FP(m68k)[dst] = double_to_fx80((double)temp2);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 6;
			break;
		}
		case 0x20:      // FDIV
		{
			REG_FP(m68k)[dst] = floatx80_div(REG_FP(m68k)[dst], source);
			m68k->remaining_cycles -= 43;
			break;
		}
		case 0x22:      // FADD
		{
			REG_FP(m68k)[dst] = floatx80_add(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 9;
			break;
		}
		case 0x23:      // FMUL
		{
			REG_FP(m68k)[dst] = floatx80_mul(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 11;
			break;
		}
		case 0x24:      // FSGLDIV
		{
			float32 a = floatx80_to_float32( REG_FP(m68k)[dst] );
			float32 b = floatx80_to_float32( source );
			REG_FP(m68k)[dst] = float32_to_floatx80( float32_div(a, b) );
			m68k->remaining_cycles -= 43; //  // ? (value is from FDIV)
			break;
		}
		case 0x25:      // FREM
		{
			REG_FP(m68k)[dst] = floatx80_rem(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 43;   // guess
			break;
		}
		case 0x27:      // FSGLMUL
		{
			float32 a = floatx80_to_float32( REG_FP(m68k)[dst] );
			float32 b = floatx80_to_float32( source );
			REG_FP(m68k)[dst] = float32_to_floatx80( float32_mul(a, b) );
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 11; // ? (value is from FMUL)
			break;
		}
		case 0x28:      // FSUB
		{
			REG_FP(m68k)[dst] = floatx80_sub(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 9;
			break;
		}
		case 0x38:      // FCMP
		{
			floatx80 res;
			res = floatx80_sub(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, res);
			m68k->remaining_cycles -= 7;
			break;
		}
		case 0x3a:      // FTST
		{
			floatx80 res;
			res = source;
			SET_CONDITION_CODES(m68k, res);
			m68k->remaining_cycles -= 7;
			break;
		}

		default:    fatalerror("fpgen_rm_reg: unimplemented opmode %02X at %08X\n", opmode, REG_PPC(m68k));
	}
}
Ejemplo n.º 4
0
static void fpgen_rm_reg(m68ki_cpu_core *m68k, UINT16 w2)
{
	int ea = m68k->ir & 0x3f;
	int rm = (w2 >> 14) & 0x1;
	int src = (w2 >> 10) & 0x7;
	int dst = (w2 >>  7) & 0x7;
	int opmode = w2 & 0x7f;
	floatx80 source;

	// fmovecr #$f, fp0 f200 5c0f

	if (rm)
	{
		switch (src)
		{
			case 0:		// Long-Word Integer
			{
				INT32 d = READ_EA_32(m68k, ea);
				source = int32_to_floatx80(d);
				break;
			}
			case 1:		// Single-precision Real
			{
				UINT32 d = READ_EA_32(m68k, ea);
				source = float32_to_floatx80(d);
				break;
			}
			case 2:		// Extended-precision Real
			{
				source = READ_EA_FPE(m68k, ea);
				break;
			}
			case 3:		// Packed-decimal Real
			{
				source = READ_EA_PACK(m68k, ea);
				break;
			}
			case 4:		// Word Integer
			{
				INT16 d = READ_EA_16(m68k, ea);
				source = int32_to_floatx80((INT32)d);
				break;
			}
			case 5:		// Double-precision Real
			{
				UINT64 d = READ_EA_64(m68k, ea);

				source = float64_to_floatx80(d);
				break;
			}
			case 6:		// Byte Integer
			{
				INT8 d = READ_EA_8(m68k, ea);
				source = int32_to_floatx80((INT32)d);
				break;
			}
			case 7:		// FMOVECR load from constant ROM
			{
				switch (w2 & 0x7f)
				{
					case 0x0:	// Pi
						source.high = 0x4000;
						source.low = U64(0xc90fdaa22168c235);
						break;

					case 0xb:	// log10(2)
						source.high = 0x3ffd;
						source.low = U64(0x9a209a84fbcff798);
						break;

					case 0xc:	// e
						source.high = 0x4000;
						source.low = U64(0xadf85458a2bb4a9b);
						break;

					case 0xd:	// log2(e)
						source.high = 0x3fff;
						source.low = U64(0xb8aa3b295c17f0bc);
						break;

					case 0xe:	// log10(e)
						source.high = 0x3ffd;
						source.low = U64(0xde5bd8a937287195);
						break;

					case 0xf:	// 0.0
						source = int32_to_floatx80((INT32)0);
						break;

					case 0x30:	// ln(2)
						source.high = 0x3ffe;
						source.low = U64(0xb17217f7d1cf79ac);
						break;

					case 0x31:	// ln(10)
						source.high = 0x4000;
						source.low = U64(0x935d8dddaaa8ac17);
						break;

					case 0x32:	// 1 (or 100?  manuals are unclear, but 1 would make more sense)
						source = int32_to_floatx80((INT32)1);
						break;

					case 0x33:	// 10^1
						source = int32_to_floatx80((INT32)10);
						break;

					case 0x34:	// 10^2
						source = int32_to_floatx80((INT32)10*10);
						break;

					default:
						fatalerror("fmove_rm_reg: unknown constant ROM offset %x at %08x\n", w2&0x7f, REG_PC(m68k)-4);
						break;
				}

				// handle it right here, the usual opmode bits aren't valid in the FMOVECR case
				REG_FP(m68k)[dst] = source;
				m68k->remaining_cycles -= 4;
				return;
			}
			default:	fatalerror("fmove_rm_reg: invalid source specifier %x at %08X\n", src, REG_PC(m68k)-4);
		}
	}
	else
	{
		source = REG_FP(m68k)[src];
	}



	switch (opmode)
	{
		case 0x00:		// FMOVE
		{
			REG_FP(m68k)[dst] = source;
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 4;
			break;
		}
		case 0x01:		// FINT
		{
			INT32 temp;
			temp = floatx80_to_int32(source);
			REG_FP(m68k)[dst] = int32_to_floatx80(temp);
			break;
		}
		case 0x03:		// FINTRZ
		{
			INT32 temp;
			temp = floatx80_to_int32_round_to_zero(source);
			REG_FP(m68k)[dst] = int32_to_floatx80(temp);
			break;
		}
		case 0x04:		// FSQRT
		{
			REG_FP(m68k)[dst] = floatx80_sqrt(source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 109;
			break;
		}
		case 0x0e:      // FSIN
		{
			REG_FP(m68k)[dst] = source;
			floatx80_fsin(REG_FP(m68k)[dst]);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 75;
			break;
		}
		case 0x0f:		// FTAN
		{
			REG_FP(m68k)[dst] = source;
			floatx80_ftan(REG_FP(m68k)[dst]);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 75;
			break;
		}
		case 0x18:		// FABS
		{
			REG_FP(m68k)[dst] = source;
			REG_FP(m68k)[dst].high &= 0x7fff;
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 3;
			break;
		}
		case 0x1a:		// FNEG
		{
			REG_FP(m68k)[dst] = source;
			REG_FP(m68k)[dst].high ^= 0x8000;
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 3;
			break;
		}
		case 0x1d:      // FCOS
		{
			REG_FP(m68k)[dst] = source;
			floatx80_fcos(REG_FP(m68k)[dst]);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 75;
			break;
		}
		case 0x1e:		// FGETEXP
		{
			INT16 temp2;

			temp2 = source.high;	// get the exponent
			temp2 -= 0x3fff;	// take off the bias
			REG_FP(m68k)[dst] = double_to_fx80((double)temp2);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 6;
		}
		case 0x20:		// FDIV
		{
			REG_FP(m68k)[dst] = floatx80_div(REG_FP(m68k)[dst], source);
			m68k->remaining_cycles -= 43;
			break;
		}
		case 0x22:		// FADD
		{
			REG_FP(m68k)[dst] = floatx80_add(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 9;
			break;
		}
		case 0x23:		// FMUL
		{
			REG_FP(m68k)[dst] = floatx80_mul(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 11;
			break;
		}
		case 0x24:		// FSGLDIV
		{
			REG_FP(m68k)[dst] = floatx80_div(REG_FP(m68k)[dst], source);
			m68k->remaining_cycles -= 43; //  // ? (value is from FDIV)
			break;
		}
		case 0x25:		// FREM
		{
			REG_FP(m68k)[dst] = floatx80_rem(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 43;	// guess
			break;
		}
		case 0x27:		// FSGLMUL
		{
			REG_FP(m68k)[dst] = floatx80_mul(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 11; // ? (value is from FMUL)
			break;
		}
		case 0x28:		// FSUB
		{
			REG_FP(m68k)[dst] = floatx80_sub(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, REG_FP(m68k)[dst]);
			m68k->remaining_cycles -= 9;
			break;
		}
		case 0x38:		// FCMP
		{
			floatx80 res;
			res = floatx80_sub(REG_FP(m68k)[dst], source);
			SET_CONDITION_CODES(m68k, res);
			m68k->remaining_cycles -= 7;
			break;
		}
		case 0x3a:		// FTST
		{
			floatx80 res;
			res = source;
			SET_CONDITION_CODES(m68k, res);
			m68k->remaining_cycles -= 7;
			break;
		}

		default:	fatalerror("fpgen_rm_reg: unimplemented opmode %02X at %08X\n", opmode, REG_PPC(m68k));
	}
}