[pcsx_rearmed.git] / deps / lightrec / lightrec-private.h

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2016-2021 Paul Cercueil <paul@crapouillou.net>
 */

#ifndef __LIGHTREC_PRIVATE_H__
#define __LIGHTREC_PRIVATE_H__

#include "lightning-wrapper.h"
#include "lightrec-config.h"
#include "disassembler.h"
#include "lightrec.h"
#include "regcache.h"

#if ENABLE_THREADED_COMPILER
#include <stdatomic.h>
#endif

#ifdef _MSC_BUILD
#include <immintrin.h>
#endif

#include <inttypes.h>
#include <stdint.h>

#define X32_FMT "0x%08"PRIx32
#define PC_FMT "PC "X32_FMT

#define ARRAY_SIZE(x) (sizeof(x) ? sizeof(x) / sizeof((x)[0]) : 0)

#define GENMASK(h, l) \
	(((uintptr_t)-1 << (l)) & ((uintptr_t)-1 >> (__WORDSIZE - 1 - (h))))

#ifdef __GNUC__
#	define likely(x)       __builtin_expect(!!(x),1)
#	define unlikely(x)     __builtin_expect(!!(x),0)
#else
#	define likely(x)       (x)
#	define unlikely(x)     (x)
#endif

#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#	define LE32TOH(x)	__builtin_bswap32(x)
#	define HTOLE32(x)	__builtin_bswap32(x)
#	define LE16TOH(x)	__builtin_bswap16(x)
#	define HTOLE16(x)	__builtin_bswap16(x)
#else
#	define LE32TOH(x)	(x)
#	define HTOLE32(x)	(x)
#	define LE16TOH(x)	(x)
#	define HTOLE16(x)	(x)
#endif

#if HAS_DEFAULT_ELM
#define SET_DEFAULT_ELM(table, value) [0 ... ARRAY_SIZE(table) - 1] = value
#else
#define SET_DEFAULT_ELM(table, value) [0] = NULL
#endif

#if __has_attribute(__fallthrough__)
#	define fallthrough	__attribute__((__fallthrough__))
#else
#	define fallthrough	do {} while (0)  /* fallthrough */
#endif

#define container_of(ptr, type, member) \
	((type *)((void *)(ptr) - offsetof(type, member)))

#ifdef _MSC_BUILD
#	define popcount32(x)	__popcnt(x)
#	define clz32(x)		_lzcnt_u32(x)
#	define ctz32(x)		_tzcnt_u32(x)
#else
#	define popcount32(x)	__builtin_popcount(x)
#	define clz32(x)		__builtin_clz(x)
#	define ctz32(x)		__builtin_ctz(x)
#endif

/* Flags for (struct block *)->flags */
#define BLOCK_NEVER_COMPILE	BIT(0)
#define BLOCK_SHOULD_RECOMPILE	BIT(1)
#define BLOCK_FULLY_TAGGED	BIT(2)
#define BLOCK_IS_DEAD		BIT(3)
#define BLOCK_IS_MEMSET		BIT(4)
#define BLOCK_NO_OPCODE_LIST	BIT(5)
#define BLOCK_PRELOAD_PC	BIT(6)

#define RAM_SIZE	0x200000
#define BIOS_SIZE	0x80000

#define CODE_LUT_SIZE	((RAM_SIZE + BIOS_SIZE) >> 2)

#define REG_LO 32
#define REG_HI 33
#define REG_TEMP (offsetof(struct lightrec_state, temp_reg) / sizeof(u32))

/* Definition of jit_state_t (avoids inclusion of <lightning.h>) */
struct jit_node;
struct jit_state;
typedef struct jit_state jit_state_t;

struct blockcache;
struct recompiler;
struct regcache;
struct opcode;
struct reaper;

struct u16x2 {
#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	u16 h, l;
#else
	u16 l, h;
#endif
};

struct block {
	jit_state_t *_jit;
	struct opcode *opcode_list;
	void (*function)(void);
	const u32 *code;
	struct block *next;
	u32 pc;
	u32 hash;
	u32 precompile_date;
	unsigned int code_size;
	u16 nb_ops;
#if ENABLE_THREADED_COMPILER
	_Atomic u8 flags;
#else
	u8 flags;
#endif
};

struct lightrec_branch {
	struct jit_node *branch;
	u32 target;
};

struct lightrec_branch_target {
	struct jit_node *label;
	u32 offset;
};

enum c_wrappers {
	C_WRAPPER_RW,
	C_WRAPPER_RW_GENERIC,
	C_WRAPPER_MFC,
	C_WRAPPER_MTC,
	C_WRAPPER_CP,
	C_WRAPPERS_COUNT,
};

struct lightrec_cstate {
	struct lightrec_state *state;

	struct lightrec_branch local_branches[512];
	struct lightrec_branch_target targets[512];
	u16 movi_temp[32];
	unsigned int nb_local_branches;
	unsigned int nb_targets;
	unsigned int cycles;

	struct regcache *reg_cache;

	_Bool no_load_delay;
};

struct lightrec_state {
	struct lightrec_registers regs;
	u32 temp_reg;
	u32 curr_pc;
	u32 next_pc;
	uintptr_t wrapper_regs[NUM_TEMPS];
	u8 in_delay_slot_n;
	u32 current_cycle;
	u32 target_cycle;
	u32 exit_flags;
	u32 old_cycle_counter;
	u32 cycles_per_op;
	void *c_wrapper;
	struct block *dispatcher, *c_wrapper_block;
	void *c_wrappers[C_WRAPPERS_COUNT];
	struct blockcache *block_cache;
	struct recompiler *rec;
	struct lightrec_cstate *cstate;
	struct reaper *reaper;
	void *tlsf;
	void (*eob_wrapper_func)(void);
	void (*interpreter_func)(void);
	void (*ds_check_func)(void);
	void (*memset_func)(void);
	void (*get_next_block)(void);
	struct lightrec_ops ops;
	unsigned int nb_precompile;
	unsigned int nb_compile;
	unsigned int nb_maps;
	const struct lightrec_mem_map *maps;
	uintptr_t offset_ram, offset_bios, offset_scratch, offset_io;
	u32 opt_flags;
	_Bool with_32bit_lut;
	_Bool mirrors_mapped;
	void *code_lut[];
};

#define lightrec_offset(ptr) \
	offsetof(struct lightrec_state, ptr)

u32 lightrec_rw(struct lightrec_state *state, union code op, u32 addr,
		u32 data, u32 *flags, struct block *block, u16 offset);

void lightrec_free_block(struct lightrec_state *state, struct block *block);

void remove_from_code_lut(struct blockcache *cache, struct block *block);

const struct lightrec_mem_map *
lightrec_get_map(struct lightrec_state *state, void **host, u32 kaddr);

static inline u32 kunseg(u32 addr)
{
	if (unlikely(addr >= 0xa0000000))
		return addr - 0xa0000000;
	else
		return addr &~ 0x80000000;
}

static inline u32 lut_offset(u32 pc)
{
	if (pc & BIT(28))
		return ((pc & (BIOS_SIZE - 1)) + RAM_SIZE) >> 2; // BIOS
	else
		return (pc & (RAM_SIZE - 1)) >> 2; // RAM
}

static inline _Bool is_big_endian(void)
{
	return __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__;
}

static inline _Bool lut_is_32bit(const struct lightrec_state *state)
{
	return __WORDSIZE == 32 ||
		(ENABLE_CODE_BUFFER && state->with_32bit_lut);
}

static inline size_t lut_elm_size(const struct lightrec_state *state)
{
	return lut_is_32bit(state) ? 4 : sizeof(void *);
}

static inline void ** lut_address(struct lightrec_state *state, u32 offset)
{
	if (lut_is_32bit(state))
		return (void **) ((uintptr_t) state->code_lut + offset * 4);
	else
		return &state->code_lut[offset];
}

static inline void * lut_read(struct lightrec_state *state, u32 offset)
{
	void **lut_entry = lut_address(state, offset);

	if (lut_is_32bit(state))
		return (void *)(uintptr_t) *(u32 *) lut_entry;
	else
		return *lut_entry;
}

static inline void lut_write(struct lightrec_state *state, u32 offset, void *ptr)
{
	void **lut_entry = lut_address(state, offset);

	if (lut_is_32bit(state))
		*(u32 *) lut_entry = (u32)(uintptr_t) ptr;
	else
		*lut_entry = ptr;
}

static inline u32 get_ds_pc(const struct block *block, u16 offset, s16 imm)
{
	u16 flags = block->opcode_list[offset].flags;

	offset += op_flag_no_ds(flags);

	return block->pc + ((offset + imm) << 2);
}

static inline u32 get_branch_pc(const struct block *block, u16 offset, s16 imm)
{
	u16 flags = block->opcode_list[offset].flags;

	offset -= op_flag_no_ds(flags);

	return block->pc + ((offset + imm) << 2);
}

void lightrec_mtc(struct lightrec_state *state, union code op, u8 reg, u32 data);
u32 lightrec_mfc(struct lightrec_state *state, union code op);
void lightrec_rfe(struct lightrec_state *state);
void lightrec_cp(struct lightrec_state *state, union code op);

struct lightrec_cstate * lightrec_create_cstate(struct lightrec_state *state);
void lightrec_free_cstate(struct lightrec_cstate *cstate);

union code lightrec_read_opcode(struct lightrec_state *state, u32 pc);

int lightrec_compile_block(struct lightrec_cstate *cstate, struct block *block);
void lightrec_free_opcode_list(struct lightrec_state *state,
			       struct opcode *list);

unsigned int lightrec_cycles_of_opcode(const struct lightrec_state *state,
				       union code code);

static inline u8 get_mult_div_lo(union code c)
{
	return (OPT_FLAG_MULT_DIV && c.r.rd) ? c.r.rd : REG_LO;
}

static inline u8 get_mult_div_hi(union code c)
{
	return (OPT_FLAG_MULT_DIV && c.r.imm) ? c.r.imm : REG_HI;
}

static inline s16 s16_max(s16 a, s16 b)
{
	return a > b ? a : b;
}

static inline _Bool block_has_flag(struct block *block, u8 flag)
{
#if ENABLE_THREADED_COMPILER
	return atomic_load_explicit(&block->flags, memory_order_relaxed) & flag;
#else
	return block->flags & flag;
#endif
}

static inline u8 block_set_flags(struct block *block, u8 mask)
{
#if ENABLE_THREADED_COMPILER
	return atomic_fetch_or_explicit(&block->flags, mask,
					memory_order_relaxed);
#else
	u8 flags = block->flags;

	block->flags |= mask;

	return flags;
#endif
}

static inline u8 block_clear_flags(struct block *block, u8 mask)
{
#if ENABLE_THREADED_COMPILER
	return atomic_fetch_and_explicit(&block->flags, ~mask,
					 memory_order_relaxed);
#else
	u8 flags = block->flags;

	block->flags &= ~mask;

	return flags;
#endif
}

static inline _Bool can_sign_extend(s32 value, u8 order)
{
      return ((u32)(value >> (order - 1)) + 1) < 2;
}

static inline _Bool can_zero_extend(u32 value, u8 order)
{
      return (value >> order) == 0;
}

static inline const struct opcode *
get_delay_slot(const struct opcode *list, u16 i)
{
	return op_flag_no_ds(list[i].flags) ? &list[i - 1] : &list[i + 1];
}

static inline _Bool lightrec_store_next_pc(void)
{
	return NUM_REGS + NUM_TEMPS <= 4;
}

#endif /* __LIGHTREC_PRIVATE_H__ */
Commit	Line	Data
	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
	2	/*
	3	* Copyright (C) 2016-2021 Paul Cercueil <paul@crapouillou.net>
	4	*/
	5
	6	#ifndef __LIGHTREC_PRIVATE_H__
	7	#define __LIGHTREC_PRIVATE_H__
	8
	9	#include "lightning-wrapper.h"
	10	#include "lightrec-config.h"
	11	#include "disassembler.h"
	12	#include "lightrec.h"
	13	#include "regcache.h"
	14
	15	#if ENABLE_THREADED_COMPILER
	16	#include <stdatomic.h>
	17	#endif
	18
	19	#ifdef _MSC_BUILD
	20	#include <immintrin.h>
	21	#endif
	22
	23	#include <inttypes.h>
	24	#include <stdint.h>
	25
	26	#define X32_FMT "0x%08"PRIx32
	27	#define PC_FMT "PC "X32_FMT
	28
	29	#define ARRAY_SIZE(x) (sizeof(x) ? sizeof(x) / sizeof((x)[0]) : 0)
	30
	31	#define GENMASK(h, l) \
	32	(((uintptr_t)-1 << (l)) & ((uintptr_t)-1 >> (__WORDSIZE - 1 - (h))))
	33
	34	#ifdef __GNUC__
	35	# define likely(x) __builtin_expect(!!(x),1)
	36	# define unlikely(x) __builtin_expect(!!(x),0)
	37	#else
	38	# define likely(x) (x)
	39	# define unlikely(x) (x)
	40	#endif
	41
	42	#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	43	# define LE32TOH(x) __builtin_bswap32(x)
	44	# define HTOLE32(x) __builtin_bswap32(x)
	45	# define LE16TOH(x) __builtin_bswap16(x)
	46	# define HTOLE16(x) __builtin_bswap16(x)
	47	#else
	48	# define LE32TOH(x) (x)
	49	# define HTOLE32(x) (x)
	50	# define LE16TOH(x) (x)
	51	# define HTOLE16(x) (x)
	52	#endif
	53
	54	#if HAS_DEFAULT_ELM
	55	#define SET_DEFAULT_ELM(table, value) [0 ... ARRAY_SIZE(table) - 1] = value
	56	#else
	57	#define SET_DEFAULT_ELM(table, value) [0] = NULL
	58	#endif
	59
	60	#if __has_attribute(__fallthrough__)
	61	# define fallthrough __attribute__((__fallthrough__))
	62	#else
	63	# define fallthrough do {} while (0) /* fallthrough */
	64	#endif
	65
	66	#define container_of(ptr, type, member) \
	67	((type )((void )(ptr) - offsetof(type, member)))
	68
	69	#ifdef _MSC_BUILD
	70	# define popcount32(x) __popcnt(x)
	71	# define clz32(x) _lzcnt_u32(x)
	72	# define ctz32(x) _tzcnt_u32(x)
	73	#else
	74	# define popcount32(x) __builtin_popcount(x)
	75	# define clz32(x) __builtin_clz(x)
	76	# define ctz32(x) __builtin_ctz(x)
	77	#endif
	78
	79	/* Flags for (struct block )->flags /
	80	#define BLOCK_NEVER_COMPILE BIT(0)
	81	#define BLOCK_SHOULD_RECOMPILE BIT(1)
	82	#define BLOCK_FULLY_TAGGED BIT(2)
	83	#define BLOCK_IS_DEAD BIT(3)
	84	#define BLOCK_IS_MEMSET BIT(4)
	85	#define BLOCK_NO_OPCODE_LIST BIT(5)
	86	#define BLOCK_PRELOAD_PC BIT(6)
	87
	88	#define RAM_SIZE 0x200000
	89	#define BIOS_SIZE 0x80000
	90
	91	#define CODE_LUT_SIZE ((RAM_SIZE + BIOS_SIZE) >> 2)
	92
	93	#define REG_LO 32
	94	#define REG_HI 33
	95	#define REG_TEMP (offsetof(struct lightrec_state, temp_reg) / sizeof(u32))
	96
	97	/* Definition of jit_state_t (avoids inclusion of <lightning.h>) */
	98	struct jit_node;
	99	struct jit_state;
	100	typedef struct jit_state jit_state_t;
	101
	102	struct blockcache;
	103	struct recompiler;
	104	struct regcache;
	105	struct opcode;
	106	struct reaper;
	107
	108	struct u16x2 {
	109	#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
	110	u16 h, l;
	111	#else
	112	u16 l, h;
	113	#endif
	114	};
	115
	116	struct block {
	117	jit_state_t *_jit;
	118	struct opcode *opcode_list;
	119	void (*function)(void);
	120	const u32 *code;
	121	struct block *next;
	122	u32 pc;
	123	u32 hash;
	124	u32 precompile_date;
	125	unsigned int code_size;
	126	u16 nb_ops;
	127	#if ENABLE_THREADED_COMPILER
	128	_Atomic u8 flags;
	129	#else
	130	u8 flags;
	131	#endif
	132	};
	133
	134	struct lightrec_branch {
	135	struct jit_node *branch;
	136	u32 target;
	137	};
	138
	139	struct lightrec_branch_target {
	140	struct jit_node *label;
	141	u32 offset;
	142	};
	143
	144	enum c_wrappers {
	145	C_WRAPPER_RW,
	146	C_WRAPPER_RW_GENERIC,
	147	C_WRAPPER_MFC,
	148	C_WRAPPER_MTC,
	149	C_WRAPPER_CP,
	150	C_WRAPPERS_COUNT,
	151	};
	152
	153	struct lightrec_cstate {
	154	struct lightrec_state *state;
	155
	156	struct lightrec_branch local_branches[512];
	157	struct lightrec_branch_target targets[512];
	158	u16 movi_temp[32];
	159	unsigned int nb_local_branches;
	160	unsigned int nb_targets;
	161	unsigned int cycles;
	162
	163	struct regcache *reg_cache;
	164
	165	_Bool no_load_delay;
	166	};
	167
	168	struct lightrec_state {
	169	struct lightrec_registers regs;
	170	u32 temp_reg;
	171	u32 curr_pc;
	172	u32 next_pc;
	173	uintptr_t wrapper_regs[NUM_TEMPS];
	174	u8 in_delay_slot_n;
	175	u32 current_cycle;
	176	u32 target_cycle;
	177	u32 exit_flags;
	178	u32 old_cycle_counter;
	179	u32 cycles_per_op;
	180	void *c_wrapper;
	181	struct block dispatcher, c_wrapper_block;
	182	void *c_wrappers[C_WRAPPERS_COUNT];
	183	struct blockcache *block_cache;
	184	struct recompiler *rec;
	185	struct lightrec_cstate *cstate;
	186	struct reaper *reaper;
	187	void *tlsf;
	188	void (*eob_wrapper_func)(void);
	189	void (*interpreter_func)(void);
	190	void (*ds_check_func)(void);
	191	void (*memset_func)(void);
	192	void (*get_next_block)(void);
	193	struct lightrec_ops ops;
	194	unsigned int nb_precompile;
	195	unsigned int nb_compile;
	196	unsigned int nb_maps;
	197	const struct lightrec_mem_map *maps;
	198	uintptr_t offset_ram, offset_bios, offset_scratch, offset_io;
	199	u32 opt_flags;
	200	_Bool with_32bit_lut;
	201	_Bool mirrors_mapped;
	202	void *code_lut[];
	203	};
	204
	205	#define lightrec_offset(ptr) \
	206	offsetof(struct lightrec_state, ptr)
	207
	208	u32 lightrec_rw(struct lightrec_state *state, union code op, u32 addr,
	209	u32 data, u32 flags, struct block block, u16 offset);
	210
	211	void lightrec_free_block(struct lightrec_state state, struct block block);
	212
	213	void remove_from_code_lut(struct blockcache cache, struct block block);
	214
	215	const struct lightrec_mem_map *
	216	lightrec_get_map(struct lightrec_state state, void *host, u32 kaddr);
	217
	218	static inline u32 kunseg(u32 addr)
	219	{
	220	if (unlikely(addr >= 0xa0000000))
	221	return addr - 0xa0000000;
	222	else
	223	return addr &~ 0x80000000;
	224	}
	225
	226	static inline u32 lut_offset(u32 pc)
	227	{
	228	if (pc & BIT(28))
	229	return ((pc & (BIOS_SIZE - 1)) + RAM_SIZE) >> 2; // BIOS
	230	else
	231	return (pc & (RAM_SIZE - 1)) >> 2; // RAM
	232	}
	233
	234	static inline _Bool is_big_endian(void)
	235	{
	236	return __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__;
	237	}
	238
	239	static inline _Bool lut_is_32bit(const struct lightrec_state *state)
	240	{
	241	return __WORDSIZE == 32 \|\|
	242	(ENABLE_CODE_BUFFER && state->with_32bit_lut);
	243	}
	244
	245	static inline size_t lut_elm_size(const struct lightrec_state *state)
	246	{
	247	return lut_is_32bit(state) ? 4 : sizeof(void *);
	248	}
	249
	250	static inline void ** lut_address(struct lightrec_state *state, u32 offset)
	251	{
	252	if (lut_is_32bit(state))
	253	return (void *) ((uintptr_t) state->code_lut + offset 4);
	254	else
	255	return &state->code_lut[offset];
	256	}
	257
	258	static inline void * lut_read(struct lightrec_state *state, u32 offset)
	259	{
	260	void **lut_entry = lut_address(state, offset);
	261
	262	if (lut_is_32bit(state))
	263	return (void )(uintptr_t) (u32 *) lut_entry;
	264	else
	265	return *lut_entry;
	266	}
	267
	268	static inline void lut_write(struct lightrec_state state, u32 offset, void ptr)
	269	{
	270	void **lut_entry = lut_address(state, offset);
	271
	272	if (lut_is_32bit(state))
	273	(u32 ) lut_entry = (u32)(uintptr_t) ptr;
	274	else
	275	*lut_entry = ptr;
	276	}
	277
	278	static inline u32 get_ds_pc(const struct block *block, u16 offset, s16 imm)
	279	{
	280	u16 flags = block->opcode_list[offset].flags;
	281
	282	offset += op_flag_no_ds(flags);
	283
	284	return block->pc + ((offset + imm) << 2);
	285	}
	286
	287	static inline u32 get_branch_pc(const struct block *block, u16 offset, s16 imm)
	288	{
	289	u16 flags = block->opcode_list[offset].flags;
	290
	291	offset -= op_flag_no_ds(flags);
	292
	293	return block->pc + ((offset + imm) << 2);
	294	}
	295
	296	void lightrec_mtc(struct lightrec_state *state, union code op, u8 reg, u32 data);
	297	u32 lightrec_mfc(struct lightrec_state *state, union code op);
	298	void lightrec_rfe(struct lightrec_state *state);
	299	void lightrec_cp(struct lightrec_state *state, union code op);
	300
	301	struct lightrec_cstate * lightrec_create_cstate(struct lightrec_state *state);
	302	void lightrec_free_cstate(struct lightrec_cstate *cstate);
	303
	304	union code lightrec_read_opcode(struct lightrec_state *state, u32 pc);
	305
	306	int lightrec_compile_block(struct lightrec_cstate cstate, struct block block);
	307	void lightrec_free_opcode_list(struct lightrec_state *state,
	308	struct opcode *list);
	309
	310	unsigned int lightrec_cycles_of_opcode(const struct lightrec_state *state,
	311	union code code);
	312
	313	static inline u8 get_mult_div_lo(union code c)
	314	{
	315	return (OPT_FLAG_MULT_DIV && c.r.rd) ? c.r.rd : REG_LO;
	316	}
	317
	318	static inline u8 get_mult_div_hi(union code c)
	319	{
	320	return (OPT_FLAG_MULT_DIV && c.r.imm) ? c.r.imm : REG_HI;
	321	}
	322
	323	static inline s16 s16_max(s16 a, s16 b)
	324	{
	325	return a > b ? a : b;
	326	}
	327
	328	static inline _Bool block_has_flag(struct block *block, u8 flag)
	329	{
	330	#if ENABLE_THREADED_COMPILER
	331	return atomic_load_explicit(&block->flags, memory_order_relaxed) & flag;
	332	#else
	333	return block->flags & flag;
	334	#endif
	335	}
	336
	337	static inline u8 block_set_flags(struct block *block, u8 mask)
	338	{
	339	#if ENABLE_THREADED_COMPILER
	340	return atomic_fetch_or_explicit(&block->flags, mask,
	341	memory_order_relaxed);
	342	#else
	343	u8 flags = block->flags;
	344
	345	block->flags \|= mask;
	346
	347	return flags;
	348	#endif
	349	}
	350
	351	static inline u8 block_clear_flags(struct block *block, u8 mask)
	352	{
	353	#if ENABLE_THREADED_COMPILER
	354	return atomic_fetch_and_explicit(&block->flags, ~mask,
	355	memory_order_relaxed);
	356	#else
	357	u8 flags = block->flags;
	358
	359	block->flags &= ~mask;
	360
	361	return flags;
	362	#endif
	363	}
	364
	365	static inline _Bool can_sign_extend(s32 value, u8 order)
	366	{
	367	return ((u32)(value >> (order - 1)) + 1) < 2;
	368	}
	369
	370	static inline _Bool can_zero_extend(u32 value, u8 order)
	371	{
	372	return (value >> order) == 0;
	373	}
	374
	375	static inline const struct opcode *
	376	get_delay_slot(const struct opcode *list, u16 i)
	377	{
	378	return op_flag_no_ds(list[i].flags) ? &list[i - 1] : &list[i + 1];
	379	}
	380
	381	static inline _Bool lightrec_store_next_pc(void)
	382	{
	383	return NUM_REGS + NUM_TEMPS <= 4;
	384	}
	385
	386	#endif /* __LIGHTREC_PRIVATE_H__ */