gistfile1.txt

#pragma once

#include "../../../Utilities/BitField.h"

union spu_opcode_t
{
	u32 opcode;

	bf_t<u32, 0, 7> rt; // 25..31, for 3-op instructions
	bf_t<u32, 0, 7> rc; // 25..31
	bf_t<u32, 7, 7> ra; // 18..24
	bf_t<u32, 14, 7> rb; // 11..17
	bf_t<u32, 21, 7> rt4; // 4..10, for 4-op instructions
	bf_t<u32, 18, 1> e; // 13, "enable interrupts" bit
	bf_t<u32, 19, 1> d; // 12, "disable interrupts" bit
	bf_t<u32, 20, 1> c; // 11, "C" bit for SYNC instruction
	bf_t<s32, 23, 2> r0h; // 7..8, signed
	bf_t<s32, 14, 2> roh; // 16..17, signed
	bf_t<u32, 14, 7> i7; // 11..17
	bf_t<s32, 14, 7> si7; // 11..17, signed
	bf_t<u32, 14, 8> i8; // 10..17
	bf_t<s32, 14, 10> si10; // 8..17, signed
	bf_t<u32, 7, 16> i16; // 9..24
	bf_t<s32, 7, 16> si16; // 9..24, signed
	bf_t<u32, 7, 18> i18; // 7..24
};

inline u32 spu_branch_target(u32 pc, u32 imm = 0)
{
	return (pc + (imm << 2)) & 0x3fffc;
}

inline u32 spu_ls_target(u32 pc, u32 imm = 0)
{
	return (pc + (imm << 2)) & 0x3fff0;
}

static u32 spu_decode(u32 inst)
{
	return inst >> 21;
}

template<typename D, typename T>
struct instruction_info
{
	u32 magn; // Count = 2 ^ magn
	u32 value;
	T pointer;
};

// SPU decoder object. D provides functions. T is function pointer type returned.
template<typename D, typename T = decltype(&D::UNK)>
class spu_decoder
{
	// Fast lookup table
	std::array<T, 2048> m_table;

	struct instruction_info
	{
		u32 magn; // Count = 2 ^ magn
		u32 value;
		T pointer;
	};

	constexpr static std::array<instruction_info, 199> instructions = {{
		{ 0, 0x1, &D::LNOP },
	{ 0, 0x2, &D::SYNC },
	{ 0, 0x3, &D::DSYNC },
	{ 0, 0xc, &D::MFSPR },
	{ 0, 0xd, &D::RDCH },
	{ 0, 0xf, &D::RCHCNT },
	{ 0, 0x40, &D::SF },
	{ 0, 0x41, &D::OR },
	{ 0, 0x42, &D::BG },
	{ 0, 0x48, &D::SFH },
	{ 0, 0x49, &D::NOR },
	{ 0, 0x53, &D::ABSDB },
	{ 0, 0x58, &D::ROT },
	{ 0, 0x59, &D::ROTM },
	{ 0, 0x5a, &D::ROTMA },
	{ 0, 0x5b, &D::SHL },
	{ 0, 0x5c, &D::ROTH },
	{ 0, 0x5d, &D::ROTHM },
	{ 0, 0x5e, &D::ROTMAH },
	{ 0, 0x5f, &D::SHLH },
	{ 0, 0x78, &D::ROTI },
	{ 0, 0x79, &D::ROTMI },
	{ 0, 0x7a, &D::ROTMAI },
	{ 0, 0x7b, &D::SHLI },
	{ 0, 0x7c, &D::ROTHI },
	{ 0, 0x7d, &D::ROTHMI },
	{ 0, 0x7e, &D::ROTMAHI },
	{ 0, 0x7f, &D::SHLHI },
	{ 0, 0xc0, &D::A },
	{ 0, 0xc1, &D::AND },
	{ 0, 0xc2, &D::CG },
	{ 0, 0xc8, &D::AH },
	{ 0, 0xc9, &D::NAND },
	{ 0, 0xd3, &D::AVGB },
	{ 0, 0x10c, &D::MTSPR },
	{ 0, 0x10d, &D::WRCH },
	{ 0, 0x128, &D::BIZ },
	{ 0, 0x129, &D::BINZ },
	{ 0, 0x12a, &D::BIHZ },
	{ 0, 0x12b, &D::BIHNZ },
	{ 0, 0x140, &D::STOPD },
	{ 0, 0x144, &D::STQX },
	{ 0, 0x1a8, &D::BI },
	{ 0, 0x1a9, &D::BISL },
	{ 0, 0x1aa, &D::IRET },
	{ 0, 0x1ab, &D::BISLED },
	{ 0, 0x1ac, &D::HBR },
	{ 0, 0x1b0, &D::GB },
	{ 0, 0x1b1, &D::GBH },
	{ 0, 0x1b2, &D::GBB },
	{ 0, 0x1b4, &D::FSM },
	{ 0, 0x1b5, &D::FSMH },
	{ 0, 0x1b6, &D::FSMB },
	{ 0, 0x1b8, &D::FREST },
	{ 0, 0x1b9, &D::FRSQEST },
	{ 0, 0x1c4, &D::LQX },
	{ 0, 0x1cc, &D::ROTQBYBI },
	{ 0, 0x1cd, &D::ROTQMBYBI },
	{ 0, 0x1cf, &D::SHLQBYBI },
	{ 0, 0x1d4, &D::CBX },
	{ 0, 0x1d5, &D::CHX },
	{ 0, 0x1d6, &D::CWX },
	{ 0, 0x1d7, &D::CDX },
	{ 0, 0x1d8, &D::ROTQBI },
	{ 0, 0x1d9, &D::ROTQMBI },
	{ 0, 0x1db, &D::SHLQBI },
	{ 0, 0x1dc, &D::ROTQBY },
	{ 0, 0x1dd, &D::ROTQMBY },
	{ 0, 0x1df, &D::SHLQBY },
	{ 0, 0x1f0, &D::ORX },
	{ 0, 0x1f4, &D::CBD },
	{ 0, 0x1f5, &D::CHD },
	{ 0, 0x1f6, &D::CWD },
	{ 0, 0x1f7, &D::CDD },
	{ 0, 0x1f8, &D::ROTQBII },
	{ 0, 0x1f9, &D::ROTQMBII },
	{ 0, 0x1fb, &D::SHLQBII },
	{ 0, 0x1fc, &D::ROTQBYI },
	{ 0, 0x1fd, &D::ROTQMBYI },
	{ 0, 0x1ff, &D::SHLQBYI },
	{ 0, 0x201, &D::NOP },
	{ 0, 0x240, &D::CGT },
	{ 0, 0x241, &D::XOR },
	{ 0, 0x248, &D::CGTH },
	{ 0, 0x249, &D::EQV },
	{ 0, 0x250, &D::CGTB },
	{ 0, 0x253, &D::SUMB },
	{ 0, 0x258, &D::HGT },
	{ 0, 0x2a5, &D::CLZ },
	{ 0, 0x2a6, &D::XSWD },
	{ 0, 0x2ae, &D::XSHW },
	{ 0, 0x2b4, &D::CNTB },
	{ 0, 0x2b6, &D::XSBH },
	{ 0, 0x2c0, &D::CLGT },
	{ 0, 0x2c1, &D::ANDC },
	{ 0, 0x2c2, &D::FCGT },
	{ 0, 0x2c3, &D::DFCGT },
	{ 0, 0x2c4, &D::FA },
	{ 0, 0x2c5, &D::FS },
	{ 0, 0x2c6, &D::FM },
	{ 0, 0x2c8, &D::CLGTH },
	{ 0, 0x2c9, &D::ORC },
	{ 0, 0x2ca, &D::FCMGT },
	{ 0, 0x2cb, &D::DFCMGT },
	{ 0, 0x2cc, &D::DFA },
	{ 0, 0x2cd, &D::DFS },
	{ 0, 0x2ce, &D::DFM },
	{ 0, 0x2d0, &D::CLGTB },
	{ 0, 0x2d8, &D::HLGT },
	{ 0, 0x35c, &D::DFMA },
	{ 0, 0x35d, &D::DFMS },
	{ 0, 0x35e, &D::DFNMS },
	{ 0, 0x35f, &D::DFNMA },
	{ 0, 0x3c0, &D::CEQ },
	{ 0, 0x3ce, &D::MPYHHU },
	{ 0, 0x340, &D::ADDX },
	{ 0, 0x341, &D::SFX },
	{ 0, 0x342, &D::CGX },
	{ 0, 0x343, &D::BGX },
	{ 0, 0x346, &D::MPYHHA },
	{ 0, 0x34e, &D::MPYHHAU },
	{ 0, 0x398, &D::FSCRRD },
	{ 0, 0x3b8, &D::FESD },
	{ 0, 0x3b9, &D::FRDS },
	{ 0, 0x3ba, &D::FSCRWR },
	{ 0, 0x3bf, &D::DFTSV },
	{ 0, 0x3c2, &D::FCEQ },
	{ 0, 0x3c3, &D::DFCEQ },
	{ 0, 0x3c4, &D::MPY },
	{ 0, 0x3c5, &D::MPYH },
	{ 0, 0x3c6, &D::MPYHH },
	{ 0, 0x3c7, &D::MPYS },
	{ 0, 0x3c8, &D::CEQH },
	{ 0, 0x3ca, &D::FCMEQ },
	{ 0, 0x3cb, &D::DFCMEQ },
	{ 0, 0x3cc, &D::MPYU },
	{ 0, 0x3d0, &D::CEQB },
	{ 0, 0x3d4, &D::FI },
	{ 0, 0x3d8, &D::HEQ },
	{ 1, 0x1d8, &D::CFLTS },
	{ 1, 0x1d9, &D::CFLTU },
	{ 1, 0x1da, &D::CSFLT },
	{ 1, 0x1db, &D::CUFLT },
	{ 2, 0x40, &D::BRZ },
	{ 2, 0x41, &D::STQA },
	{ 2, 0x42, &D::BRNZ },
	{ 2, 0x44, &D::BRHZ },
	{ 2, 0x46, &D::BRHNZ },
	{ 2, 0x47, &D::STQR },
	{ 2, 0x60, &D::BRA },
	{ 2, 0x61, &D::LQA },
	{ 2, 0x62, &D::BRASL },
	{ 2, 0x64, &D::BR },
	{ 2, 0x65, &D::FSMBI },
	{ 2, 0x66, &D::BRSL },
	{ 2, 0x67, &D::LQR },
	{ 2, 0x81, &D::IL },
	{ 2, 0x82, &D::ILHU },
	{ 2, 0x83, &D::ILH },
	{ 2, 0xc1, &D::IOHL },
	{ 3, 0x4, &D::ORI },
	{ 3, 0x5, &D::ORHI },
	{ 3, 0x6, &D::ORBI },
	{ 3, 0xc, &D::SFI },
	{ 3, 0xd, &D::SFHI },
	{ 3, 0x14, &D::ANDI },
	{ 3, 0x15, &D::ANDHI },
	{ 3, 0x16, &D::ANDBI },
	{ 3, 0x1c, &D::AI },
	{ 3, 0x1d, &D::AHI },
	{ 3, 0x24, &D::STQD },
	{ 3, 0x34, &D::LQD },
	{ 3, 0x44, &D::XORI },
	{ 3, 0x45, &D::XORHI },
	{ 3, 0x46, &D::XORBI },
	{ 3, 0x4c, &D::CGTI },
	{ 3, 0x4d, &D::CGTHI },
	{ 3, 0x4e, &D::CGTBI },
	{ 3, 0x4f, &D::HGTI },
	{ 3, 0x5c, &D::CLGTI },
	{ 3, 0x5d, &D::CLGTHI },
	{ 3, 0x5e, &D::CLGTBI },
	{ 3, 0x5f, &D::HLGTI },
	{ 3, 0x74, &D::MPYI },
	{ 3, 0x75, &D::MPYUI },
	{ 3, 0x7c, &D::CEQI },
	{ 3, 0x7d, &D::CEQHI },
	{ 3, 0x7e, &D::CEQBI },
	{ 3, 0x7f, &D::HEQI },
	{ 4, 0x8, &D::HBRA },
	{ 4, 0x9, &D::HBRR },
	{ 4, 0x21, &D::ILA },
	{ 7, 0x8, &D::SELB },
	{ 7, 0xb, &D::SHUFB },
	{ 7, 0xc, &D::MPYA },
	{ 7, 0xd, &D::FNMS },
	{ 7, 0xe, &D::FMA },
	{ 7, 0xf, &D::FMS },
	}};

public:
	spu_decoder()
	{
		m_table.fill(&D::UNK);

		for (auto& entry : instructions)
		{
			for (u32 i = 0; i < 1u << entry.magn; i++)
			{
				m_table[entry.value << entry.magn | i] = entry.pointer;
			}
		}
	}

	const std::array<T, 2048>& get_table() const
	{
		return m_table;
	}

	T decode(u32 inst) const
	{
		return m_table[spu_decode(inst)];
	}
};