doom_py/src/vizdoom/game-music-emu/gme/Nes_Cpu.cpp [229:293]:
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	switch ( opcode )
	{
possibly_out_of_time:
		if ( s_time < (int) data )
			goto almost_out_of_time;
		s_time -= data;
		goto out_of_time;
#endif

// Macros

#define GET_MSB()   (instr [1])
#define ADD_PAGE()  (pc++, data += 0x100 * GET_MSB())
#define GET_ADDR()  GET_LE16( instr )

#define NO_PAGE_CROSSING( lsb )
#define HANDLE_PAGE_CROSSING( lsb ) s_time += (lsb) >> 8;

#define INC_DEC_XY( reg, n ) reg = uint8_t (nz = reg + n); goto loop;

#define IND_Y( cross, out ) {\
		fuint16 temp = READ_LOW( data ) + y;\
		out = temp + 0x100 * READ_LOW( uint8_t (data + 1) );\
		cross( temp );\
	}
	
#define IND_X( out ) {\
		fuint16 temp = data + x;\
		out = 0x100 * READ_LOW( uint8_t (temp + 1) ) + READ_LOW( uint8_t (temp) );\
	}
	
#define ARITH_ADDR_MODES( op )\
case op - 0x04: /* (ind,x) */\
	IND_X( data )\
	goto ptr##op;\
case op + 0x0C: /* (ind),y */\
	IND_Y( HANDLE_PAGE_CROSSING, data )\
	goto ptr##op;\
case op + 0x10: /* zp,X */\
	data = uint8_t (data + x);\
case op + 0x00: /* zp */\
	data = READ_LOW( data );\
	goto imm##op;\
case op + 0x14: /* abs,Y */\
	data += y;\
	goto ind##op;\
case op + 0x18: /* abs,X */\
	data += x;\
ind##op:\
	HANDLE_PAGE_CROSSING( data );\
case op + 0x08: /* abs */\
	ADD_PAGE();\
ptr##op:\
	FLUSH_TIME();\
	data = READ( data );\
	CACHE_TIME();\
case op + 0x04: /* imm */\
imm##op:

// TODO: more efficient way to handle negative branch that wraps PC around
#define BRANCH( cond )\
{\
	fint16 offset = (BOOST::int8_t) data;\
	fuint16 extra_clock = (++pc & 0xFF) + offset;\
	if ( !(cond) ) goto dec_clock_loop;\
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doom_py/src/vizdoom/game-music-emu/gme/Sap_Cpu.cpp [174:237]:
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	switch ( opcode )
	{
possibly_out_of_time:
		if ( s_time < (int) data )
			goto almost_out_of_time;
		s_time -= data;
		goto out_of_time;

// Macros

#define GET_MSB()   (instr [1])
#define ADD_PAGE()  (pc++, data += 0x100 * GET_MSB())
#define GET_ADDR()  GET_LE16( instr )

#define NO_PAGE_CROSSING( lsb )
#define HANDLE_PAGE_CROSSING( lsb ) s_time += (lsb) >> 8;

#define INC_DEC_XY( reg, n ) reg = uint8_t (nz = reg + n); goto loop;

#define IND_Y( cross, out ) {\
		fuint16 temp = READ_LOW( data ) + y;\
		out = temp + 0x100 * READ_LOW( uint8_t (data + 1) );\
		cross( temp );\
	}
	
#define IND_X( out ) {\
		fuint16 temp = data + x;\
		out = 0x100 * READ_LOW( uint8_t (temp + 1) ) + READ_LOW( uint8_t (temp) );\
	}
	
#define ARITH_ADDR_MODES( op )\
case op - 0x04: /* (ind,x) */\
	IND_X( data )\
	goto ptr##op;\
case op + 0x0C: /* (ind),y */\
	IND_Y( HANDLE_PAGE_CROSSING, data )\
	goto ptr##op;\
case op + 0x10: /* zp,X */\
	data = uint8_t (data + x);\
case op + 0x00: /* zp */\
	data = READ_LOW( data );\
	goto imm##op;\
case op + 0x14: /* abs,Y */\
	data += y;\
	goto ind##op;\
case op + 0x18: /* abs,X */\
	data += x;\
ind##op:\
	HANDLE_PAGE_CROSSING( data );\
case op + 0x08: /* abs */\
	ADD_PAGE();\
ptr##op:\
	FLUSH_TIME();\
	data = READ( data );\
	CACHE_TIME();\
case op + 0x04: /* imm */\
imm##op:

// TODO: more efficient way to handle negative branch that wraps PC around
#define BRANCH( cond )\
{\
	fint16 offset = (BOOST::int8_t) data;\
	fuint16 extra_clock = (++pc & 0xFF) + offset;\
	if ( !(cond) ) goto dec_clock_loop;\
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