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r31133 Saturday 28th June, 2014 at 03:58:41 UTC by Curt Coder
(MESS) c64: Precalculate PLA outputs for approximately 5% speedup. [Curt Coder]

[src/emu/machine]

pla.c pla.h

trunk/src/emu/machine/pla.c

r31132	r31133
30	30	//  pla_device - constructor
31	31	//-------------------------------------------------
32	32
33		pla_device::pla_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, int inputs, int outputs, int terms, UINT32 input_mask, const char *shortname, const char *source)
34		: device_t(mconfig, type, name, tag, owner, clock, shortname, source),
35		m_inputs(inputs),
36		m_outputs(outputs),
37		m_terms(terms),
38		m_input_mask(((UINT64)input_mask << 32) | input_mask)
	33	pla_device::pla_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, int inputs, int outputs, int terms, UINT32 input_mask, const char *shortname, const char *source) :
	34	device_t(mconfig, type, name, tag, owner, clock, shortname, source),
	35	m_inputs(inputs),
	36	m_outputs(outputs),
	37	m_terms(terms),
	38	m_input_mask(((UINT64)input_mask << 32) | input_mask)
39	39	{
40	40	}
41	41
42		pls100_device::pls100_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
43		: pla_device(mconfig, PLS100, "PLS100", tag, owner, clock, 16, 8, 48, 0xffff, "pls100", __FILE__)
	42	pls100_device::pls100_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
	43	pla_device(mconfig, PLS100, "PLS100", tag, owner, clock, 16, 8, 48, 0xffff, "pls100", __FILE__),
	44	m_output(*this, "output")
44	45	{
45	46	}
46	47
47		mos8721_device::mos8721_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
48		: pla_device(mconfig, MOS8721, "MOS8721", tag, owner, clock, 27, 18, 379, 0x7ffffff, "mos8721", __FILE__) // TODO actual number of terms is unknown
	48	mos8721_device::mos8721_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
	49	pla_device(mconfig, MOS8721, "MOS8721", tag, owner, clock, 27, 18, 379, 0x7ffffff, "mos8721", __FILE__) // TODO actual number of terms is unknown
49	50	{
50	51	}
51	52
r31132	r31133
70	71	m_cache_ptr = 0;
71	72	}
72	73
	74	void pls100_device::device_start()
	75	{
	76	pla_device::device_start();
73	77
	78	m_output.allocate(0x10000);
	79
	80	for (UINT32 input = 0; input < 0x10000; input++)
	81	{
	82	m_output[input] = pla_device::read(input);
	83	}
	84	}
	85
	86
74	87	//-------------------------------------------------
75	88	//  parse_fusemap -
76	89	//-------------------------------------------------
r31132	r31133
163	176
164	177	return s >> 32;
165	178	}
	179
	180
	181	//-------------------------------------------------
	182	//  read -
	183	//-------------------------------------------------
	184
	185	UINT32 pls100_device::read(UINT32 input)
	186	{
	187	return m_output[input];
	188	}

trunk/src/emu/machine/pla.h

r31132	r31133
68	68	// construction/destruction
69	69	pla_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, int inputs, int outputs, int terms, UINT32 output_mask, const char *shortname, const char *source);
70	70
71		UINT32 read(UINT32 input);
	71	virtual UINT32 read(UINT32 input);
72	72
73	73	protected:
74	74	// device-level overrides
r31132	r31133
101	101	{
102	102	public:
103	103	pls100_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
	104
	105	// device-level overrides
	106	virtual void device_start();
	107
	108	virtual UINT32 read(UINT32 input);
	109
	110	private:
	111	optional_shared_ptr<UINT8> m_output;
104	112	};
105	113
106	114

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