sljit/sljitNativeMIPS_32.c

   1 /*
   2  *    Stack-less Just-In-Time compiler
   3  *
   4  *    Copyright 2009-2012 Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without modification, are
   7  * permitted provided that the following conditions are met:
   8  *
   9  *   1. Redistributions of source code must retain the above copyright notice, this list of
  10  *      conditions and the following disclaimer.
  11  *
  12  *   2. Redistributions in binary form must reproduce the above copyright notice, this list
  13  *      of conditions and the following disclaimer in the documentation and/or other materials
  14  *      provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
  17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  19  * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  21  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  22  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  24  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 /* mips 32-bit arch dependent functions. */
  28
  29 static sljit_si load_immediate(struct sljit_compiler *compiler, sljit_si dst_ar, sljit_sw imm)
  30 {
  31         if (!(imm & ~0xffff))
  32                 return push_inst(compiler, ORI | SA(0) | TA(dst_ar) | IMM(imm), dst_ar);
  33
  34         if (imm < 0 && imm >= SIMM_MIN)
  35                 return push_inst(compiler, ADDIU | SA(0) | TA(dst_ar) | IMM(imm), dst_ar);
  36
  37         FAIL_IF(push_inst(compiler, LUI | TA(dst_ar) | IMM(imm >> 16), dst_ar));
  38         return (imm & 0xffff) ? push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(imm), dst_ar) : SLJIT_SUCCESS;
  39 }
  40
  41 #define EMIT_LOGICAL(op_imm, op_norm) \
  42         if (flags & SRC2_IMM) { \
  43                 if (op & SLJIT_SET_E) \
  44                         FAIL_IF(push_inst(compiler, op_imm | S(src1) | TA(EQUAL_FLAG) | IMM(src2), EQUAL_FLAG)); \
  45                 if (CHECK_FLAGS(SLJIT_SET_E)) \
  46                         FAIL_IF(push_inst(compiler, op_imm | S(src1) | T(dst) | IMM(src2), DR(dst))); \
  47         } \
  48         else { \
  49                 if (op & SLJIT_SET_E) \
  50                         FAIL_IF(push_inst(compiler, op_norm | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG)); \
  51                 if (CHECK_FLAGS(SLJIT_SET_E)) \
  52                         FAIL_IF(push_inst(compiler, op_norm | S(src1) | T(src2) | D(dst), DR(dst))); \
  53         }
  54
  55 #define EMIT_SHIFT(op_imm, op_v) \
  56         if (flags & SRC2_IMM) { \
  57                 if (op & SLJIT_SET_E) \
  58                         FAIL_IF(push_inst(compiler, op_imm | T(src1) | DA(EQUAL_FLAG) | SH_IMM(src2), EQUAL_FLAG)); \
  59                 if (CHECK_FLAGS(SLJIT_SET_E)) \
  60                         FAIL_IF(push_inst(compiler, op_imm | T(src1) | D(dst) | SH_IMM(src2), DR(dst))); \
  61         } \
  62         else { \
  63                 if (op & SLJIT_SET_E) \
  64                         FAIL_IF(push_inst(compiler, op_v | S(src2) | T(src1) | DA(EQUAL_FLAG), EQUAL_FLAG)); \
  65                 if (CHECK_FLAGS(SLJIT_SET_E)) \
  66                         FAIL_IF(push_inst(compiler, op_v | S(src2) | T(src1) | D(dst), DR(dst))); \
  67         }
  68
  69 static SLJIT_INLINE sljit_si emit_single_op(struct sljit_compiler *compiler, sljit_si op, sljit_si flags,
  70         sljit_si dst, sljit_si src1, sljit_sw src2)
  71 {
  72         switch (GET_OPCODE(op)) {
  73         case SLJIT_MOV:
  74         case SLJIT_MOV_UI:
  75         case SLJIT_MOV_SI:
  76         case SLJIT_MOV_P:
  77                 SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
  78                 if (dst != src2)
  79                         return push_inst(compiler, ADDU | S(src2) | TA(0) | D(dst), DR(dst));
  80                 return SLJIT_SUCCESS;
  81
  82         case SLJIT_MOV_UB:
  83         case SLJIT_MOV_SB:
  84                 SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
  85                 if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
  86                         if (op == SLJIT_MOV_SB) {
  87 #if (defined SLJIT_MIPS_32_64 && SLJIT_MIPS_32_64)
  88                                 return push_inst(compiler, SEB | T(src2) | D(dst), DR(dst));
  89 #else
  90                                 FAIL_IF(push_inst(compiler, SLL | T(src2) | D(dst) | SH_IMM(24), DR(dst)));
  91                                 return push_inst(compiler, SRA | T(dst) | D(dst) | SH_IMM(24), DR(dst));
  92 #endif
  93                         }
  94                         return push_inst(compiler, ANDI | S(src2) | T(dst) | IMM(0xff), DR(dst));
  95                 }
  96                 else if (dst != src2)
  97                         SLJIT_ASSERT_STOP();
  98                 return SLJIT_SUCCESS;
  99
 100         case SLJIT_MOV_UH:
 101         case SLJIT_MOV_SH:
 102                 SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
 103                 if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
 104                         if (op == SLJIT_MOV_SH) {
 105 #if (defined SLJIT_MIPS_32_64 && SLJIT_MIPS_32_64)
 106                                 return push_inst(compiler, SEH | T(src2) | D(dst), DR(dst));
 107 #else
 108                                 FAIL_IF(push_inst(compiler, SLL | T(src2) | D(dst) | SH_IMM(16), DR(dst)));
 109                                 return push_inst(compiler, SRA | T(dst) | D(dst) | SH_IMM(16), DR(dst));
 110 #endif
 111                         }
 112                         return push_inst(compiler, ANDI | S(src2) | T(dst) | IMM(0xffff), DR(dst));
 113                 }
 114                 else if (dst != src2)
 115                         SLJIT_ASSERT_STOP();
 116                 return SLJIT_SUCCESS;
 117
 118         case SLJIT_NOT:
 119                 SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
 120                 if (op & SLJIT_SET_E)
 121                         FAIL_IF(push_inst(compiler, NOR | S(src2) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
 122                 if (CHECK_FLAGS(SLJIT_SET_E))
 123                         FAIL_IF(push_inst(compiler, NOR | S(src2) | T(src2) | D(dst), DR(dst)));
 124                 return SLJIT_SUCCESS;
 125
 126         case SLJIT_CLZ:
 127                 SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
 128 #if (defined SLJIT_MIPS_32_64 && SLJIT_MIPS_32_64)
 129                 if (op & SLJIT_SET_E)
 130                         FAIL_IF(push_inst(compiler, CLZ | S(src2) | TA(EQUAL_FLAG) | DA(EQUAL_FLAG), EQUAL_FLAG));
 131                 if (CHECK_FLAGS(SLJIT_SET_E))
 132                         FAIL_IF(push_inst(compiler, CLZ | S(src2) | T(dst) | D(dst), DR(dst)));
 133 #else
 134                 if (SLJIT_UNLIKELY(flags & UNUSED_DEST)) {
 135                         FAIL_IF(push_inst(compiler, SRL | T(src2) | DA(EQUAL_FLAG) | SH_IMM(31), EQUAL_FLAG));
 136                         return push_inst(compiler, XORI | SA(EQUAL_FLAG) | TA(EQUAL_FLAG) | IMM(1), EQUAL_FLAG);
 137                 }
 138                 /* Nearly all instructions are unmovable in the following sequence. */
 139                 FAIL_IF(push_inst(compiler, ADDU | S(src2) | TA(0) | D(TMP_REG1), DR(TMP_REG1)));
 140                 /* Check zero. */
 141                 FAIL_IF(push_inst(compiler, BEQ | S(TMP_REG1) | TA(0) | IMM(5), UNMOVABLE_INS));
 142                 FAIL_IF(push_inst(compiler, ORI | SA(0) | T(dst) | IMM(32), UNMOVABLE_INS));
 143                 FAIL_IF(push_inst(compiler, ADDIU | SA(0) | T(dst) | IMM(-1), DR(dst)));
 144                 /* Loop for searching the highest bit. */
 145                 FAIL_IF(push_inst(compiler, ADDIU | S(dst) | T(dst) | IMM(1), DR(dst)));
 146                 FAIL_IF(push_inst(compiler, BGEZ | S(TMP_REG1) | IMM(-2), UNMOVABLE_INS));
 147                 FAIL_IF(push_inst(compiler, SLL | T(TMP_REG1) | D(TMP_REG1) | SH_IMM(1), UNMOVABLE_INS));
 148                 if (op & SLJIT_SET_E)
 149                         return push_inst(compiler, ADDU | S(dst) | TA(0) | DA(EQUAL_FLAG), EQUAL_FLAG);
 150 #endif
 151                 return SLJIT_SUCCESS;
 152
 153         case SLJIT_ADD:
 154                 if (flags & SRC2_IMM) {
 155                         if (op & SLJIT_SET_O) {
 156                                 if (src2 >= 0)
 157                                         FAIL_IF(push_inst(compiler, OR | S(src1) | T(src1) | DA(TMP_EREG1), TMP_EREG1));
 158                                 else
 159                                         FAIL_IF(push_inst(compiler, NOR | S(src1) | T(src1) | DA(TMP_EREG1), TMP_EREG1));
 160                         }
 161                         if (op & SLJIT_SET_E)
 162                                 FAIL_IF(push_inst(compiler, ADDIU | S(src1) | TA(EQUAL_FLAG) | IMM(src2), EQUAL_FLAG));
 163                         if (op & (SLJIT_SET_C | SLJIT_SET_O)) {
 164                                 if (src2 >= 0)
 165                                         FAIL_IF(push_inst(compiler, ORI | S(src1) | TA(ULESS_FLAG) | IMM(src2), ULESS_FLAG));
 166                                 else {
 167                                         FAIL_IF(push_inst(compiler, ADDIU | SA(0) | TA(ULESS_FLAG) | IMM(src2), ULESS_FLAG));
 168                                         FAIL_IF(push_inst(compiler, OR | S(src1) | TA(ULESS_FLAG) | DA(ULESS_FLAG), ULESS_FLAG));
 169                                 }
 170                         }
 171                         /* dst may be the same as src1 or src2. */
 172                         if (CHECK_FLAGS(SLJIT_SET_E))
 173                                 FAIL_IF(push_inst(compiler, ADDIU | S(src1) | T(dst) | IMM(src2), DR(dst)));
 174                 }
 175                 else {
 176                         if (op & SLJIT_SET_O)
 177                                 FAIL_IF(push_inst(compiler, XOR | S(src1) | T(src2) | DA(TMP_EREG1), TMP_EREG1));
 178                         if (op & SLJIT_SET_E)
 179                                 FAIL_IF(push_inst(compiler, ADDU | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
 180                         if (op & (SLJIT_SET_C | SLJIT_SET_O))
 181                                 FAIL_IF(push_inst(compiler, OR | S(src1) | T(src2) | DA(ULESS_FLAG), ULESS_FLAG));
 182                         /* dst may be the same as src1 or src2. */
 183                         if (CHECK_FLAGS(SLJIT_SET_E))
 184                                 FAIL_IF(push_inst(compiler, ADDU | S(src1) | T(src2) | D(dst), DR(dst)));
 185                 }
 186
 187                 /* a + b >= a | b (otherwise, the carry should be set to 1). */
 188                 if (op & (SLJIT_SET_C | SLJIT_SET_O))
 189                         FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(ULESS_FLAG) | DA(ULESS_FLAG), ULESS_FLAG));
 190                 if (!(op & SLJIT_SET_O))
 191                         return SLJIT_SUCCESS;
 192                 FAIL_IF(push_inst(compiler, SLL | TA(ULESS_FLAG) | DA(OVERFLOW_FLAG) | SH_IMM(31), OVERFLOW_FLAG));
 193                 FAIL_IF(push_inst(compiler, XOR | SA(TMP_EREG1) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
 194                 FAIL_IF(push_inst(compiler, XOR | S(dst) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
 195                 return push_inst(compiler, SLL | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG) | SH_IMM(31), OVERFLOW_FLAG);
 196
 197         case SLJIT_ADDC:
 198                 if (flags & SRC2_IMM) {
 199                         if (op & SLJIT_SET_C) {
 200                                 if (src2 >= 0)
 201                                         FAIL_IF(push_inst(compiler, ORI | S(src1) | TA(TMP_EREG1) | IMM(src2), TMP_EREG1));
 202                                 else {
 203                                         FAIL_IF(push_inst(compiler, ADDIU | SA(0) | TA(TMP_EREG1) | IMM(src2), TMP_EREG1));
 204                                         FAIL_IF(push_inst(compiler, OR | S(src1) | TA(TMP_EREG1) | DA(TMP_EREG1), TMP_EREG1));
 205                                 }
 206                         }
 207                         FAIL_IF(push_inst(compiler, ADDIU | S(src1) | T(dst) | IMM(src2), DR(dst)));
 208                 } else {
 209                         if (op & SLJIT_SET_C)
 210                                 FAIL_IF(push_inst(compiler, OR | S(src1) | T(src2) | DA(TMP_EREG1), TMP_EREG1));
 211                         /* dst may be the same as src1 or src2. */
 212                         FAIL_IF(push_inst(compiler, ADDU | S(src1) | T(src2) | D(dst), DR(dst)));
 213                 }
 214                 if (op & SLJIT_SET_C)
 215                         FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(TMP_EREG1) | DA(TMP_EREG1), TMP_EREG1));
 216
 217                 FAIL_IF(push_inst(compiler, ADDU | S(dst) | TA(ULESS_FLAG) | D(dst), DR(dst)));
 218                 if (!(op & SLJIT_SET_C))
 219                         return SLJIT_SUCCESS;
 220
 221                 /* Set ULESS_FLAG (dst == 0) && (ULESS_FLAG == 1). */
 222                 FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(ULESS_FLAG) | DA(ULESS_FLAG), ULESS_FLAG));
 223                 /* Set carry flag. */
 224                 return push_inst(compiler, OR | SA(ULESS_FLAG) | TA(TMP_EREG1) | DA(ULESS_FLAG), ULESS_FLAG);
 225
 226         case SLJIT_SUB:
 227                 if ((flags & SRC2_IMM) && ((op & (SLJIT_SET_U | SLJIT_SET_S)) || src2 == SIMM_MIN)) {
 228                         FAIL_IF(push_inst(compiler, ADDIU | SA(0) | T(TMP_REG2) | IMM(src2), DR(TMP_REG2)));
 229                         src2 = TMP_REG2;
 230                         flags &= ~SRC2_IMM;
 231                 }
 232
 233                 if (flags & SRC2_IMM) {
 234                         if (op & SLJIT_SET_O) {
 235                                 if (src2 >= 0)
 236                                         FAIL_IF(push_inst(compiler, OR | S(src1) | T(src1) | DA(TMP_EREG1), TMP_EREG1));
 237                                 else
 238                                         FAIL_IF(push_inst(compiler, NOR | S(src1) | T(src1) | DA(TMP_EREG1), TMP_EREG1));
 239                         }
 240                         if (op & SLJIT_SET_E)
 241                                 FAIL_IF(push_inst(compiler, ADDIU | S(src1) | TA(EQUAL_FLAG) | IMM(-src2), EQUAL_FLAG));
 242                         if (op & (SLJIT_SET_C | SLJIT_SET_O))
 243                                 FAIL_IF(push_inst(compiler, SLTIU | S(src1) | TA(ULESS_FLAG) | IMM(src2), ULESS_FLAG));
 244                         /* dst may be the same as src1 or src2. */
 245                         if (CHECK_FLAGS(SLJIT_SET_E))
 246                                 FAIL_IF(push_inst(compiler, ADDIU | S(src1) | T(dst) | IMM(-src2), DR(dst)));
 247                 }
 248                 else {
 249                         if (op & SLJIT_SET_O)
 250                                 FAIL_IF(push_inst(compiler, XOR | S(src1) | T(src2) | DA(TMP_EREG1), TMP_EREG1));
 251                         if (op & SLJIT_SET_E)
 252                                 FAIL_IF(push_inst(compiler, SUBU | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
 253                         if (op & (SLJIT_SET_U | SLJIT_SET_C | SLJIT_SET_O))
 254                                 FAIL_IF(push_inst(compiler, SLTU | S(src1) | T(src2) | DA(ULESS_FLAG), ULESS_FLAG));
 255                         if (op & SLJIT_SET_U)
 256                                 FAIL_IF(push_inst(compiler, SLTU | S(src2) | T(src1) | DA(UGREATER_FLAG), UGREATER_FLAG));
 257                         if (op & SLJIT_SET_S) {
 258                                 FAIL_IF(push_inst(compiler, SLT | S(src1) | T(src2) | DA(LESS_FLAG), LESS_FLAG));
 259                                 FAIL_IF(push_inst(compiler, SLT | S(src2) | T(src1) | DA(GREATER_FLAG), GREATER_FLAG));
 260                         }
 261                         /* dst may be the same as src1 or src2. */
 262                         if (CHECK_FLAGS(SLJIT_SET_E | SLJIT_SET_U | SLJIT_SET_S | SLJIT_SET_C))
 263                                 FAIL_IF(push_inst(compiler, SUBU | S(src1) | T(src2) | D(dst), DR(dst)));
 264                 }
 265
 266                 if (!(op & SLJIT_SET_O))
 267                         return SLJIT_SUCCESS;
 268                 FAIL_IF(push_inst(compiler, SLL | TA(ULESS_FLAG) | DA(OVERFLOW_FLAG) | SH_IMM(31), OVERFLOW_FLAG));
 269                 FAIL_IF(push_inst(compiler, XOR | SA(TMP_EREG1) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
 270                 FAIL_IF(push_inst(compiler, XOR | S(dst) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
 271                 return push_inst(compiler, SRL | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG) | SH_IMM(31), OVERFLOW_FLAG);
 272
 273         case SLJIT_SUBC:
 274                 if ((flags & SRC2_IMM) && src2 == SIMM_MIN) {
 275                         FAIL_IF(push_inst(compiler, ADDIU | SA(0) | T(TMP_REG2) | IMM(src2), DR(TMP_REG2)));
 276                         src2 = TMP_REG2;
 277                         flags &= ~SRC2_IMM;
 278                 }
 279
 280                 if (flags & SRC2_IMM) {
 281                         if (op & SLJIT_SET_C)
 282                                 FAIL_IF(push_inst(compiler, SLTIU | S(src1) | TA(TMP_EREG1) | IMM(src2), TMP_EREG1));
 283                         /* dst may be the same as src1 or src2. */
 284                         FAIL_IF(push_inst(compiler, ADDIU | S(src1) | T(dst) | IMM(-src2), DR(dst)));
 285                 }
 286                 else {
 287                         if (op & SLJIT_SET_C)
 288                                 FAIL_IF(push_inst(compiler, SLTU | S(src1) | T(src2) | DA(TMP_EREG1), TMP_EREG1));
 289                         /* dst may be the same as src1 or src2. */
 290                         FAIL_IF(push_inst(compiler, SUBU | S(src1) | T(src2) | D(dst), DR(dst)));
 291                 }
 292
 293                 if (op & SLJIT_SET_C)
 294                         FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(ULESS_FLAG) | DA(TMP_EREG2), TMP_EREG2));
 295
 296                 FAIL_IF(push_inst(compiler, SUBU | S(dst) | TA(ULESS_FLAG) | D(dst), DR(dst)));
 297                 return (op & SLJIT_SET_C) ? push_inst(compiler, OR | SA(TMP_EREG1) | TA(TMP_EREG2) | DA(ULESS_FLAG), ULESS_FLAG) : SLJIT_SUCCESS;
 298
 299         case SLJIT_MUL:
 300                 SLJIT_ASSERT(!(flags & SRC2_IMM));
 301                 if (!(op & SLJIT_SET_O)) {
 302 #if (defined SLJIT_MIPS_32_64 && SLJIT_MIPS_32_64)
 303                         return push_inst(compiler, MUL | S(src1) | T(src2) | D(dst), DR(dst));
 304 #else
 305                         FAIL_IF(push_inst(compiler, MULT | S(src1) | T(src2), MOVABLE_INS));
 306                         return push_inst(compiler, MFLO | D(dst), DR(dst));
 307 #endif
 308                 }
 309                 FAIL_IF(push_inst(compiler, MULT | S(src1) | T(src2), MOVABLE_INS));
 310                 FAIL_IF(push_inst(compiler, MFHI | DA(TMP_EREG1), TMP_EREG1));
 311                 FAIL_IF(push_inst(compiler, MFLO | D(dst), DR(dst)));
 312                 FAIL_IF(push_inst(compiler, SRA | T(dst) | DA(TMP_EREG2) | SH_IMM(31), TMP_EREG2));
 313                 return push_inst(compiler, SUBU | SA(TMP_EREG1) | TA(TMP_EREG2) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG);
 314
 315         case SLJIT_AND:
 316                 EMIT_LOGICAL(ANDI, AND);
 317                 return SLJIT_SUCCESS;
 318
 319         case SLJIT_OR:
 320                 EMIT_LOGICAL(ORI, OR);
 321                 return SLJIT_SUCCESS;
 322
 323         case SLJIT_XOR:
 324                 EMIT_LOGICAL(XORI, XOR);
 325                 return SLJIT_SUCCESS;
 326
 327         case SLJIT_SHL:
 328                 EMIT_SHIFT(SLL, SLLV);
 329                 return SLJIT_SUCCESS;
 330
 331         case SLJIT_LSHR:
 332                 EMIT_SHIFT(SRL, SRLV);
 333                 return SLJIT_SUCCESS;
 334
 335         case SLJIT_ASHR:
 336                 EMIT_SHIFT(SRA, SRAV);
 337                 return SLJIT_SUCCESS;
 338         }
 339
 340         SLJIT_ASSERT_STOP();
 341         return SLJIT_SUCCESS;
 342 }
 343
 344 static SLJIT_INLINE sljit_si emit_const(struct sljit_compiler *compiler, sljit_si dst, sljit_sw init_value)
 345 {
 346         FAIL_IF(push_inst(compiler, LUI | T(dst) | IMM(init_value >> 16), DR(dst)));
 347         return push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value), DR(dst));
 348 }
 349
 350 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_addr)
 351 {
 352         sljit_ins *inst = (sljit_ins*)addr;
 353
 354         inst[0] = (inst[0] & 0xffff0000) | ((new_addr >> 16) & 0xffff);
 355         inst[1] = (inst[1] & 0xffff0000) | (new_addr & 0xffff);
 356         SLJIT_CACHE_FLUSH(inst, inst + 2);
 357 }
 358
 359 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant)
 360 {
 361         sljit_ins *inst = (sljit_ins*)addr;
 362
 363         inst[0] = (inst[0] & 0xffff0000) | ((new_constant >> 16) & 0xffff);
 364         inst[1] = (inst[1] & 0xffff0000) | (new_constant & 0xffff);
 365         SLJIT_CACHE_FLUSH(inst, inst + 2);
 366 }