__attribute__((hot))
static inline uint8_t memory_read(struct nes_state *state, uint32_t offset) {
	state->cpu.cycles++;
	apu_tick(state);
	ppu_tick(state);

	if(offset <= 0x1fff) {
		return state->ram[offset & 0x07ff];
	}

	if(offset >= 0x8000) {
		return state->mapper_function.prg_rom_read(state, offset);
	}

	if(offset >= 0x2000 && offset <= 0x3fff) {
		return ppu_read(state, offset);
	}

	if(offset == 0x4015) {
		return apu_read4015(state);
	}

	if(offset >= 0x4016 && offset <= 0x4017) {
		uint32_t index = offset & 1;
		uint8_t value = (state->ppu.input_latch[index] >> state->ppu.input_bit[index]) & 1;
		state->ppu.input_bit[index]++;
		return value | 0x40;	// Bit 6 open bus high, bit 7 low
	}

	if(offset >= 0x6000 && offset <= 0x7fff) {
		return state->mapper_function.prg_ram_read(state, offset);
	}

	return 0;
}

__attribute__((always_inline, hot))
static inline uint8_t memory_read_dummy(struct nes_state *state, uint32_t offset) {
	state->cpu.cycles++;
	apu_tick(state);
	ppu_tick(state);

	uint8_t result = 0;

	if(offset >= 0x2000 && offset < 0x4000) {
		result = ppu_read(state, offset);
	}
	return result;
}

__attribute__((hot, optimize("no-jump-tables")))
static inline void memory_write(struct nes_state *state, uint32_t offset, uint8_t value) {
	state->cpu.cycles++;
	apu_tick(state);
	ppu_tick(state);

	switch(offset) {
		case 0x0000 ... 0x1fff: {
			state->ram[offset & 0x07ff] = value;
		} break;


		case 0x2000 ... 0x3fff: {
			ppu_write(state, offset, value);
		} break;

		case 0x4000 ... 0x4017: {
			switch(offset) {
				case 0x4014: {
					ppu_dma_4014(state, value);
				} break;

				case 0x4016: {
					// joypad strobe
					uint8_t s = value & 1;

					// if(s) {
						uint8_t prev = state->ppu.input_strobe;
						state->ppu.input_strobe = s;

						if(prev == 1 && (s) == 0) {
							// state->ppu.input[0] = tas_input[tas_frame_count];

							state->ppu.input_latch[0] = state->ppu.input[0];
							state->ppu.input_latch[1] = state->ppu.input[1];
							state->ppu.input_bit[0] = 0;
							state->ppu.input_bit[1] = 0;
						}
					// }
				} break;

				default: {
					apu_write(state, offset, value);
				} break;
			}
		} break;

		case 0x6000 ... 0x7fff: {
			state->mapper_function.prg_ram_write(state, offset, value);
		} break;

		case 0x8000 ... 0xffff: {
			state->mapper_function.prg_rom_write(state, offset, value);
		} break;

	}
}

__attribute__((hot, flatten))
static inline uint8_t memory_read_dma(struct nes_state *state, uint32_t offset) {
	// NOTE(peter): DO NOT tick CPU/PPU/APU — caller handles timing
	return state->ram[offset & 0x07ff];
}