--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/luajit/src/lj_iropt.h	Thu Jan 22 20:10:30 2026 -0800
@@ -0,0 +1,162 @@
+/*
+** Common header for IR emitter and optimizations.
+** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+#ifndef _LJ_IROPT_H
+#define _LJ_IROPT_H
+
+#include <stdarg.h>
+
+#include "lj_obj.h"
+#include "lj_jit.h"
+
+#if LJ_HASJIT
+/* IR emitter. */
+LJ_FUNC void LJ_FASTCALL lj_ir_growtop(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_ir_emit(jit_State *J);
+
+/* Save current IR in J->fold.ins, but do not emit it (yet). */
+static LJ_AINLINE void lj_ir_set_(jit_State *J, uint16_t ot, IRRef1 a, IRRef1 b)
+{
+  J->fold.ins.ot = ot; J->fold.ins.op1 = a; J->fold.ins.op2 = b;
+}
+
+#define lj_ir_set(J, ot, a, b) \
+  lj_ir_set_(J, (uint16_t)(ot), (IRRef1)(a), (IRRef1)(b))
+
+/* Get ref of next IR instruction and optionally grow IR.
+** Note: this may invalidate all IRIns*!
+*/
+static LJ_AINLINE IRRef lj_ir_nextins(jit_State *J)
+{
+  IRRef ref = J->cur.nins;
+  if (LJ_UNLIKELY(ref >= J->irtoplim)) lj_ir_growtop(J);
+  J->cur.nins = ref + 1;
+  return ref;
+}
+
+LJ_FUNC TRef lj_ir_ggfload(jit_State *J, IRType t, uintptr_t ofs);
+
+/* Interning of constants. */
+LJ_FUNC TRef LJ_FASTCALL lj_ir_kint(jit_State *J, int32_t k);
+LJ_FUNC TRef lj_ir_k64(jit_State *J, IROp op, uint64_t u64);
+LJ_FUNC TRef lj_ir_knum_u64(jit_State *J, uint64_t u64);
+LJ_FUNC TRef lj_ir_knumint(jit_State *J, lua_Number n);
+LJ_FUNC TRef lj_ir_kint64(jit_State *J, uint64_t u64);
+LJ_FUNC TRef lj_ir_kgc(jit_State *J, GCobj *o, IRType t);
+LJ_FUNC TRef lj_ir_kptr_(jit_State *J, IROp op, void *ptr);
+LJ_FUNC TRef lj_ir_knull(jit_State *J, IRType t);
+LJ_FUNC TRef lj_ir_kslot(jit_State *J, TRef key, IRRef slot);
+LJ_FUNC TRef lj_ir_ktrace(jit_State *J);
+
+#if LJ_64
+#define lj_ir_kintp(J, k)	lj_ir_kint64(J, (uint64_t)(k))
+#else
+#define lj_ir_kintp(J, k)	lj_ir_kint(J, (int32_t)(k))
+#endif
+
+static LJ_AINLINE TRef lj_ir_knum(jit_State *J, lua_Number n)
+{
+  TValue tv;
+  tv.n = n;
+  return lj_ir_knum_u64(J, tv.u64);
+}
+
+#define lj_ir_kstr(J, str)	lj_ir_kgc(J, obj2gco((str)), IRT_STR)
+#define lj_ir_ktab(J, tab)	lj_ir_kgc(J, obj2gco((tab)), IRT_TAB)
+#define lj_ir_kfunc(J, func)	lj_ir_kgc(J, obj2gco((func)), IRT_FUNC)
+#define lj_ir_kptr(J, ptr)	lj_ir_kptr_(J, IR_KPTR, (ptr))
+#define lj_ir_kkptr(J, ptr)	lj_ir_kptr_(J, IR_KKPTR, (ptr))
+
+/* Special FP constants. */
+#define lj_ir_knum_zero(J)	lj_ir_knum_u64(J, U64x(00000000,00000000))
+#define lj_ir_knum_one(J)	lj_ir_knum_u64(J, U64x(3ff00000,00000000))
+#define lj_ir_knum_tobit(J)	lj_ir_knum_u64(J, U64x(43380000,00000000))
+
+/* Special 128 bit SIMD constants. */
+#define lj_ir_ksimd(J, idx) \
+  lj_ir_ggfload(J, IRT_NUM, (uintptr_t)LJ_KSIMD(J, idx) - (uintptr_t)J2GG(J))
+
+/* Access to constants. */
+LJ_FUNC void lj_ir_kvalue(lua_State *L, TValue *tv, const IRIns *ir);
+
+/* Convert IR operand types. */
+LJ_FUNC TRef LJ_FASTCALL lj_ir_tonumber(jit_State *J, TRef tr);
+LJ_FUNC TRef LJ_FASTCALL lj_ir_tonum(jit_State *J, TRef tr);
+LJ_FUNC TRef LJ_FASTCALL lj_ir_tostr(jit_State *J, TRef tr);
+
+/* Miscellaneous IR ops. */
+LJ_FUNC int lj_ir_numcmp(lua_Number a, lua_Number b, IROp op);
+LJ_FUNC int lj_ir_strcmp(GCstr *a, GCstr *b, IROp op);
+LJ_FUNC void lj_ir_rollback(jit_State *J, IRRef ref);
+
+/* Emit IR instructions with on-the-fly optimizations. */
+LJ_FUNC TRef LJ_FASTCALL lj_opt_fold(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_cse(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_cselim(jit_State *J, IRRef lim);
+
+/* Special return values for the fold functions. */
+enum {
+  NEXTFOLD,		/* Couldn't fold, pass on. */
+  RETRYFOLD,		/* Retry fold with modified fins. */
+  KINTFOLD,		/* Return ref for int constant in fins->i. */
+  FAILFOLD,		/* Guard would always fail. */
+  DROPFOLD,		/* Guard eliminated. */
+  MAX_FOLD
+};
+
+#define INTFOLD(k)	((J->fold.ins.i = (k)), (TRef)KINTFOLD)
+#define INT64FOLD(k)	(lj_ir_kint64(J, (k)))
+#define CONDFOLD(cond)	((TRef)FAILFOLD + (TRef)(cond))
+#define LEFTFOLD	(J->fold.ins.op1)
+#define RIGHTFOLD	(J->fold.ins.op2)
+#define CSEFOLD		(lj_opt_cse(J))
+#define EMITFOLD	(lj_ir_emit(J))
+
+/* Load/store forwarding. */
+LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_aload(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_hload(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_uload(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_fload(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_xload(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_alen(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_hrefk(jit_State *J);
+LJ_FUNC int LJ_FASTCALL lj_opt_fwd_href_nokey(jit_State *J);
+LJ_FUNC int LJ_FASTCALL lj_opt_fwd_tptr(jit_State *J, IRRef lim);
+LJ_FUNC int LJ_FASTCALL lj_opt_fwd_sbuf(jit_State *J, IRRef lim);
+LJ_FUNC int lj_opt_fwd_wasnonnil(jit_State *J, IROpT loadop, IRRef xref);
+
+/* Dead-store elimination. */
+LJ_FUNC TRef LJ_FASTCALL lj_opt_dse_ahstore(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_dse_ustore(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_dse_fstore(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_dse_xstore(jit_State *J);
+
+/* Narrowing. */
+LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_convert(jit_State *J);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_index(jit_State *J, TRef key);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_toint(jit_State *J, TRef tr);
+LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_tobit(jit_State *J, TRef tr);
+#if LJ_HASFFI
+LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_cindex(jit_State *J, TRef key);
+#endif
+LJ_FUNC TRef lj_opt_narrow_arith(jit_State *J, TRef rb, TRef rc,
+				 TValue *vb, TValue *vc, IROp op);
+LJ_FUNC TRef lj_opt_narrow_unm(jit_State *J, TRef rc, TValue *vc);
+LJ_FUNC TRef lj_opt_narrow_mod(jit_State *J, TRef rb, TRef rc, TValue *vb, TValue *vc);
+LJ_FUNC IRType lj_opt_narrow_forl(jit_State *J, cTValue *forbase);
+
+/* Optimization passes. */
+LJ_FUNC void lj_opt_dce(jit_State *J);
+LJ_FUNC int lj_opt_loop(jit_State *J);
+#if LJ_SOFTFP32 || (LJ_32 && LJ_HASFFI)
+LJ_FUNC void lj_opt_split(jit_State *J);
+#else
+#define lj_opt_split(J)		UNUSED(J)
+#endif
+LJ_FUNC void lj_opt_sink(jit_State *J);
+
+#endif
+
+#endif