src/lj_iropt.h

   1 /*
   2 ** Common header for IR emitter and optimizations.
   3 ** Copyright (C) 2005-2012 Mike Pall. See Copyright Notice in luajit.h
   4 */
   5
   6 #ifndef _LJ_IROPT_H
   7 #define _LJ_IROPT_H
   8
   9 #include <stdarg.h>
  10
  11 #include "lj_obj.h"
  12 #include "lj_jit.h"
  13
  14 #if LJ_HASJIT
  15 /* IR emitter. */
  16 LJ_FUNC void LJ_FASTCALL lj_ir_growtop(jit_State *J);
  17 LJ_FUNC TRef LJ_FASTCALL lj_ir_emit(jit_State *J);
  18
  19 /* Save current IR in J->fold.ins, but do not emit it (yet). */
  20 static LJ_AINLINE void lj_ir_set_(jit_State *J, uint16_t ot, IRRef1 a, IRRef1 b)
  21 {
  22   J->fold.ins.ot = ot; J->fold.ins.op1 = a; J->fold.ins.op2 = b;
  23 }
  24
  25 #define lj_ir_set(J, ot, a, b) \
  26   lj_ir_set_(J, (uint16_t)(ot), (IRRef1)(a), (IRRef1)(b))
  27
  28 /* Get ref of next IR instruction and optionally grow IR.
  29 ** Note: this may invalidate all IRIns*!
  30 */
  31 static LJ_AINLINE IRRef lj_ir_nextins(jit_State *J)
  32 {
  33   IRRef ref = J->cur.nins;
  34   if (LJ_UNLIKELY(ref >= J->irtoplim)) lj_ir_growtop(J);
  35   J->cur.nins = ref + 1;
  36   return ref;
  37 }
  38
  39 /* Interning of constants. */
  40 LJ_FUNC TRef LJ_FASTCALL lj_ir_kint(jit_State *J, int32_t k);
  41 LJ_FUNC void lj_ir_k64_freeall(jit_State *J);
  42 LJ_FUNC TRef lj_ir_k64(jit_State *J, IROp op, cTValue *tv);
  43 LJ_FUNC cTValue *lj_ir_k64_find(jit_State *J, uint64_t u64);
  44 LJ_FUNC TRef lj_ir_knum_u64(jit_State *J, uint64_t u64);
  45 LJ_FUNC TRef lj_ir_knumint(jit_State *J, lua_Number n);
  46 LJ_FUNC TRef lj_ir_kint64(jit_State *J, uint64_t u64);
  47 LJ_FUNC TRef lj_ir_kgc(jit_State *J, GCobj *o, IRType t);
  48 LJ_FUNC TRef lj_ir_kptr_(jit_State *J, IROp op, void *ptr);
  49 LJ_FUNC TRef lj_ir_knull(jit_State *J, IRType t);
  50 LJ_FUNC TRef lj_ir_kslot(jit_State *J, TRef key, IRRef slot);
  51
  52 #if LJ_64
  53 #define lj_ir_kintp(J, k)       lj_ir_kint64(J, (uint64_t)(k))
  54 #else
  55 #define lj_ir_kintp(J, k)       lj_ir_kint(J, (int32_t)(k))
  56 #endif
  57
  58 static LJ_AINLINE TRef lj_ir_knum(jit_State *J, lua_Number n)
  59 {
  60   TValue tv;
  61   tv.n = n;
  62   return lj_ir_knum_u64(J, tv.u64);
  63 }
  64
  65 #define lj_ir_kstr(J, str)      lj_ir_kgc(J, obj2gco((str)), IRT_STR)
  66 #define lj_ir_ktab(J, tab)      lj_ir_kgc(J, obj2gco((tab)), IRT_TAB)
  67 #define lj_ir_kfunc(J, func)    lj_ir_kgc(J, obj2gco((func)), IRT_FUNC)
  68 #define lj_ir_kptr(J, ptr)      lj_ir_kptr_(J, IR_KPTR, (ptr))
  69 #define lj_ir_kkptr(J, ptr)     lj_ir_kptr_(J, IR_KKPTR, (ptr))
  70
  71 /* Special FP constants. */
  72 #define lj_ir_knum_zero(J)      lj_ir_knum_u64(J, U64x(00000000,00000000))
  73 #define lj_ir_knum_one(J)       lj_ir_knum_u64(J, U64x(3ff00000,00000000))
  74 #define lj_ir_knum_tobit(J)     lj_ir_knum_u64(J, U64x(43380000,00000000))
  75
  76 /* Special 128 bit SIMD constants. */
  77 #define lj_ir_knum_abs(J)       lj_ir_k64(J, IR_KNUM, LJ_KSIMD(J, LJ_KSIMD_ABS))
  78 #define lj_ir_knum_neg(J)       lj_ir_k64(J, IR_KNUM, LJ_KSIMD(J, LJ_KSIMD_NEG))
  79
  80 /* Access to constants. */
  81 LJ_FUNC void lj_ir_kvalue(lua_State *L, TValue *tv, const IRIns *ir);
  82
  83 /* Convert IR operand types. */
  84 LJ_FUNC TRef LJ_FASTCALL lj_ir_tonumber(jit_State *J, TRef tr);
  85 LJ_FUNC TRef LJ_FASTCALL lj_ir_tonum(jit_State *J, TRef tr);
  86 LJ_FUNC TRef LJ_FASTCALL lj_ir_tostr(jit_State *J, TRef tr);
  87
  88 /* Miscellaneous IR ops. */
  89 LJ_FUNC int lj_ir_numcmp(lua_Number a, lua_Number b, IROp op);
  90 LJ_FUNC int lj_ir_strcmp(GCstr *a, GCstr *b, IROp op);
  91 LJ_FUNC void lj_ir_rollback(jit_State *J, IRRef ref);
  92
  93 /* Emit IR instructions with on-the-fly optimizations. */
  94 LJ_FUNC TRef LJ_FASTCALL lj_opt_fold(jit_State *J);
  95 LJ_FUNC TRef LJ_FASTCALL lj_opt_cse(jit_State *J);
  96 LJ_FUNC TRef LJ_FASTCALL lj_opt_cselim(jit_State *J, IRRef lim);
  97
  98 /* Special return values for the fold functions. */
  99 enum {
 100   NEXTFOLD,             /* Couldn't fold, pass on. */
 101   RETRYFOLD,            /* Retry fold with modified fins. */
 102   KINTFOLD,             /* Return ref for int constant in fins->i. */
 103   FAILFOLD,             /* Guard would always fail. */
 104   DROPFOLD,             /* Guard eliminated. */
 105   MAX_FOLD
 106 };
 107
 108 #define INTFOLD(k)      ((J->fold.ins.i = (k)), (TRef)KINTFOLD)
 109 #define INT64FOLD(k)    (lj_ir_kint64(J, (k)))
 110 #define CONDFOLD(cond)  ((TRef)FAILFOLD + (TRef)(cond))
 111 #define LEFTFOLD        (J->fold.ins.op1)
 112 #define RIGHTFOLD       (J->fold.ins.op2)
 113 #define CSEFOLD         (lj_opt_cse(J))
 114 #define EMITFOLD        (lj_ir_emit(J))
 115
 116 /* Load/store forwarding. */
 117 LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_aload(jit_State *J);
 118 LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_hload(jit_State *J);
 119 LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_uload(jit_State *J);
 120 LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_fload(jit_State *J);
 121 LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_xload(jit_State *J);
 122 LJ_FUNC TRef LJ_FASTCALL lj_opt_fwd_tab_len(jit_State *J);
 123 LJ_FUNC int LJ_FASTCALL lj_opt_fwd_href_nokey(jit_State *J);
 124 LJ_FUNC int LJ_FASTCALL lj_opt_fwd_tptr(jit_State *J, IRRef lim);
 125 LJ_FUNC int lj_opt_fwd_wasnonnil(jit_State *J, IROpT loadop, IRRef xref);
 126
 127 /* Dead-store elimination. */
 128 LJ_FUNC TRef LJ_FASTCALL lj_opt_dse_ahstore(jit_State *J);
 129 LJ_FUNC TRef LJ_FASTCALL lj_opt_dse_ustore(jit_State *J);
 130 LJ_FUNC TRef LJ_FASTCALL lj_opt_dse_fstore(jit_State *J);
 131 LJ_FUNC TRef LJ_FASTCALL lj_opt_dse_xstore(jit_State *J);
 132
 133 /* Narrowing. */
 134 LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_convert(jit_State *J);
 135 LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_index(jit_State *J, TRef key);
 136 LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_toint(jit_State *J, TRef tr);
 137 LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_tobit(jit_State *J, TRef tr);
 138 #if LJ_HASFFI
 139 LJ_FUNC TRef LJ_FASTCALL lj_opt_narrow_cindex(jit_State *J, TRef key);
 140 #endif
 141 LJ_FUNC TRef lj_opt_narrow_arith(jit_State *J, TRef rb, TRef rc,
 142                                  TValue *vb, TValue *vc, IROp op);
 143 LJ_FUNC TRef lj_opt_narrow_unm(jit_State *J, TRef rc, TValue *vc);
 144 LJ_FUNC TRef lj_opt_narrow_mod(jit_State *J, TRef rb, TRef rc, TValue *vc);
 145 LJ_FUNC TRef lj_opt_narrow_pow(jit_State *J, TRef rb, TRef rc, TValue *vc);
 146 LJ_FUNC IRType lj_opt_narrow_forl(jit_State *J, cTValue *forbase);
 147
 148 /* Optimization passes. */
 149 LJ_FUNC void lj_opt_dce(jit_State *J);
 150 LJ_FUNC int lj_opt_loop(jit_State *J);
 151 #if LJ_SOFTFP || (LJ_32 && LJ_HASFFI)
 152 LJ_FUNC void lj_opt_split(jit_State *J);
 153 #else
 154 #define lj_opt_split(J)         UNUSED(J)
 155 #endif
 156
 157 #endif
 158
 159 #endif