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sljitNativePPC_64.c revision 1.1.1.5
      1 /*
      2  *    Stack-less Just-In-Time compiler
      3  *
      4  *    Copyright Zoltan Herczeg (hzmester (at) 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 /* ppc 64-bit arch dependent functions. */
     28 
     29 #if defined(__GNUC__) || (defined(__IBM_GCC_ASM) && __IBM_GCC_ASM)
     30 #define ASM_SLJIT_CLZ(src, dst) \
     31 	__asm__ volatile ( "cntlzd %0, %1" : "=r"(dst) : "r"(src) )
     32 #elif defined(__xlc__)
     33 #error "Please enable GCC syntax for inline assembly statements"
     34 #else
     35 #error "Must implement count leading zeroes"
     36 #endif
     37 
     38 #define RLDI(dst, src, sh, mb, type) \
     39 	(HI(30) | S(src) | A(dst) | ((type) << 2) | (((sh) & 0x1f) << 11) | (((sh) & 0x20) >> 4) | (((mb) & 0x1f) << 6) | ((mb) & 0x20))
     40 
     41 #define PUSH_RLDICR(reg, shift) \
     42 	push_inst(compiler, RLDI(reg, reg, 63 - shift, shift, 1))
     43 
     44 static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw imm)
     45 {
     46 	sljit_uw tmp;
     47 	sljit_uw shift;
     48 	sljit_uw tmp2;
     49 	sljit_uw shift2;
     50 
     51 	if (imm <= SIMM_MAX && imm >= SIMM_MIN)
     52 		return push_inst(compiler, ADDI | D(reg) | A(0) | IMM(imm));
     53 
     54 	if (!(imm & ~0xffff))
     55 		return push_inst(compiler, ORI | S(TMP_ZERO) | A(reg) | IMM(imm));
     56 
     57 	if (imm <= 0x7fffffffl && imm >= -0x80000000l) {
     58 		FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(imm >> 16)));
     59 		return (imm & 0xffff) ? push_inst(compiler, ORI | S(reg) | A(reg) | IMM(imm)) : SLJIT_SUCCESS;
     60 	}
     61 
     62 	/* Count leading zeroes. */
     63 	tmp = (imm >= 0) ? imm : ~imm;
     64 	ASM_SLJIT_CLZ(tmp, shift);
     65 	SLJIT_ASSERT(shift > 0);
     66 	shift--;
     67 	tmp = (imm << shift);
     68 
     69 	if ((tmp & ~0xffff000000000000ul) == 0) {
     70 		FAIL_IF(push_inst(compiler, ADDI | D(reg) | A(0) | IMM(tmp >> 48)));
     71 		shift += 15;
     72 		return PUSH_RLDICR(reg, shift);
     73 	}
     74 
     75 	if ((tmp & ~0xffffffff00000000ul) == 0) {
     76 		FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(tmp >> 48)));
     77 		FAIL_IF(push_inst(compiler, ORI | S(reg) | A(reg) | IMM(tmp >> 32)));
     78 		shift += 31;
     79 		return PUSH_RLDICR(reg, shift);
     80 	}
     81 
     82 	/* Cut out the 16 bit from immediate. */
     83 	shift += 15;
     84 	tmp2 = imm & ((1ul << (63 - shift)) - 1);
     85 
     86 	if (tmp2 <= 0xffff) {
     87 		FAIL_IF(push_inst(compiler, ADDI | D(reg) | A(0) | IMM(tmp >> 48)));
     88 		FAIL_IF(PUSH_RLDICR(reg, shift));
     89 		return push_inst(compiler, ORI | S(reg) | A(reg) | tmp2);
     90 	}
     91 
     92 	if (tmp2 <= 0xffffffff) {
     93 		FAIL_IF(push_inst(compiler, ADDI | D(reg) | A(0) | IMM(tmp >> 48)));
     94 		FAIL_IF(PUSH_RLDICR(reg, shift));
     95 		FAIL_IF(push_inst(compiler, ORIS | S(reg) | A(reg) | (tmp2 >> 16)));
     96 		return (imm & 0xffff) ? push_inst(compiler, ORI | S(reg) | A(reg) | IMM(tmp2)) : SLJIT_SUCCESS;
     97 	}
     98 
     99 	ASM_SLJIT_CLZ(tmp2, shift2);
    100 	tmp2 <<= shift2;
    101 
    102 	if ((tmp2 & ~0xffff000000000000ul) == 0) {
    103 		FAIL_IF(push_inst(compiler, ADDI | D(reg) | A(0) | IMM(tmp >> 48)));
    104 		shift2 += 15;
    105 		shift += (63 - shift2);
    106 		FAIL_IF(PUSH_RLDICR(reg, shift));
    107 		FAIL_IF(push_inst(compiler, ORI | S(reg) | A(reg) | (tmp2 >> 48)));
    108 		return PUSH_RLDICR(reg, shift2);
    109 	}
    110 
    111 	/* The general version. */
    112 	FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(imm >> 48)));
    113 	FAIL_IF(push_inst(compiler, ORI | S(reg) | A(reg) | IMM(imm >> 32)));
    114 	FAIL_IF(PUSH_RLDICR(reg, 31));
    115 	FAIL_IF(push_inst(compiler, ORIS | S(reg) | A(reg) | IMM(imm >> 16)));
    116 	return push_inst(compiler, ORI | S(reg) | A(reg) | IMM(imm));
    117 }
    118 
    119 /* Simplified mnemonics: clrldi. */
    120 #define INS_CLEAR_LEFT(dst, src, from) \
    121 	(RLDICL | S(src) | A(dst) | ((from) << 6) | (1 << 5))
    122 
    123 /* Sign extension for integer operations. */
    124 #define UN_EXTS() \
    125 	if ((flags & (ALT_SIGN_EXT | REG2_SOURCE)) == (ALT_SIGN_EXT | REG2_SOURCE)) { \
    126 		FAIL_IF(push_inst(compiler, EXTSW | S(src2) | A(TMP_REG2))); \
    127 		src2 = TMP_REG2; \
    128 	}
    129 
    130 #define BIN_EXTS() \
    131 	if (flags & ALT_SIGN_EXT) { \
    132 		if (flags & REG1_SOURCE) { \
    133 			FAIL_IF(push_inst(compiler, EXTSW | S(src1) | A(TMP_REG1))); \
    134 			src1 = TMP_REG1; \
    135 		} \
    136 		if (flags & REG2_SOURCE) { \
    137 			FAIL_IF(push_inst(compiler, EXTSW | S(src2) | A(TMP_REG2))); \
    138 			src2 = TMP_REG2; \
    139 		} \
    140 	}
    141 
    142 #define BIN_IMM_EXTS() \
    143 	if ((flags & (ALT_SIGN_EXT | REG1_SOURCE)) == (ALT_SIGN_EXT | REG1_SOURCE)) { \
    144 		FAIL_IF(push_inst(compiler, EXTSW | S(src1) | A(TMP_REG1))); \
    145 		src1 = TMP_REG1; \
    146 	}
    147 
    148 static SLJIT_INLINE sljit_s32 emit_single_op(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 flags,
    149 	sljit_s32 dst, sljit_s32 src1, sljit_s32 src2)
    150 {
    151 	switch (op) {
    152 	case SLJIT_MOV:
    153 	case SLJIT_MOV_P:
    154 		SLJIT_ASSERT(src1 == TMP_REG1);
    155 		if (dst != src2)
    156 			return push_inst(compiler, OR | S(src2) | A(dst) | B(src2));
    157 		return SLJIT_SUCCESS;
    158 
    159 	case SLJIT_MOV_U32:
    160 	case SLJIT_MOV_S32:
    161 		SLJIT_ASSERT(src1 == TMP_REG1);
    162 		if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
    163 			if (op == SLJIT_MOV_S32)
    164 				return push_inst(compiler, EXTSW | S(src2) | A(dst));
    165 			return push_inst(compiler, INS_CLEAR_LEFT(dst, src2, 0));
    166 		}
    167 		else {
    168 			SLJIT_ASSERT(dst == src2);
    169 		}
    170 		return SLJIT_SUCCESS;
    171 
    172 	case SLJIT_MOV_U8:
    173 	case SLJIT_MOV_S8:
    174 		SLJIT_ASSERT(src1 == TMP_REG1);
    175 		if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
    176 			if (op == SLJIT_MOV_S8)
    177 				return push_inst(compiler, EXTSB | S(src2) | A(dst));
    178 			return push_inst(compiler, INS_CLEAR_LEFT(dst, src2, 24));
    179 		}
    180 		else if ((flags & REG_DEST) && op == SLJIT_MOV_S8)
    181 			return push_inst(compiler, EXTSB | S(src2) | A(dst));
    182 		else {
    183 			SLJIT_ASSERT(dst == src2);
    184 		}
    185 		return SLJIT_SUCCESS;
    186 
    187 	case SLJIT_MOV_U16:
    188 	case SLJIT_MOV_S16:
    189 		SLJIT_ASSERT(src1 == TMP_REG1);
    190 		if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
    191 			if (op == SLJIT_MOV_S16)
    192 				return push_inst(compiler, EXTSH | S(src2) | A(dst));
    193 			return push_inst(compiler, INS_CLEAR_LEFT(dst, src2, 16));
    194 		}
    195 		else {
    196 			SLJIT_ASSERT(dst == src2);
    197 		}
    198 		return SLJIT_SUCCESS;
    199 
    200 	case SLJIT_NOT:
    201 		SLJIT_ASSERT(src1 == TMP_REG1);
    202 		UN_EXTS();
    203 		return push_inst(compiler, NOR | RC(flags) | S(src2) | A(dst) | B(src2));
    204 
    205 	case SLJIT_NEG:
    206 		SLJIT_ASSERT(src1 == TMP_REG1);
    207 		UN_EXTS();
    208 		return push_inst(compiler, NEG | OERC(flags) | D(dst) | A(src2));
    209 
    210 	case SLJIT_CLZ:
    211 		SLJIT_ASSERT(src1 == TMP_REG1);
    212 		if (flags & ALT_FORM1)
    213 			return push_inst(compiler, CNTLZW | RC(flags) | S(src2) | A(dst));
    214 		return push_inst(compiler, CNTLZD | RC(flags) | S(src2) | A(dst));
    215 
    216 	case SLJIT_ADD:
    217 		if (flags & ALT_FORM1) {
    218 			/* Flags does not set: BIN_IMM_EXTS unnecessary. */
    219 			SLJIT_ASSERT(src2 == TMP_REG2);
    220 			return push_inst(compiler, ADDI | D(dst) | A(src1) | compiler->imm);
    221 		}
    222 		if (flags & ALT_FORM2) {
    223 			/* Flags does not set: BIN_IMM_EXTS unnecessary. */
    224 			SLJIT_ASSERT(src2 == TMP_REG2);
    225 			return push_inst(compiler, ADDIS | D(dst) | A(src1) | compiler->imm);
    226 		}
    227 		if (flags & ALT_FORM3) {
    228 			SLJIT_ASSERT(src2 == TMP_REG2);
    229 			BIN_IMM_EXTS();
    230 			return push_inst(compiler, ADDIC | D(dst) | A(src1) | compiler->imm);
    231 		}
    232 		if (flags & ALT_FORM4) {
    233 			/* Flags does not set: BIN_IMM_EXTS unnecessary. */
    234 			FAIL_IF(push_inst(compiler, ADDI | D(dst) | A(src1) | (compiler->imm & 0xffff)));
    235 			return push_inst(compiler, ADDIS | D(dst) | A(dst) | (((compiler->imm >> 16) & 0xffff) + ((compiler->imm >> 15) & 0x1)));
    236 		}
    237 		if (!(flags & ALT_SET_FLAGS))
    238 			return push_inst(compiler, ADD | D(dst) | A(src1) | B(src2));
    239 		BIN_EXTS();
    240 		return push_inst(compiler, ADDC | OERC(ALT_SET_FLAGS) | D(dst) | A(src1) | B(src2));
    241 
    242 	case SLJIT_ADDC:
    243 		BIN_EXTS();
    244 		return push_inst(compiler, ADDE | D(dst) | A(src1) | B(src2));
    245 
    246 	case SLJIT_SUB:
    247 		if (flags & ALT_FORM1) {
    248 			/* Flags does not set: BIN_IMM_EXTS unnecessary. */
    249 			SLJIT_ASSERT(src2 == TMP_REG2);
    250 			return push_inst(compiler, SUBFIC | D(dst) | A(src1) | compiler->imm);
    251 		}
    252 		if (flags & (ALT_FORM2 | ALT_FORM3)) {
    253 			SLJIT_ASSERT(src2 == TMP_REG2);
    254 			return push_inst(compiler, ((flags & ALT_FORM2) ? CMPI : CMPLI) | CRD(0 | ((flags & ALT_SIGN_EXT) ? 0 : 1)) | A(src1) | compiler->imm);
    255 		}
    256 		if (flags & (ALT_FORM4 | ALT_FORM5)) {
    257 			return push_inst(compiler, ((flags & ALT_FORM4) ? CMP : CMPL) | CRD(0 | ((flags & ALT_SIGN_EXT) ? 0 : 1)) | A(src1) | B(src2));
    258 		}
    259 		if (flags & ALT_FORM6) {
    260 			SLJIT_ASSERT(src2 == TMP_REG2);
    261 			FAIL_IF(push_inst(compiler, CMPLI | CRD(0 | ((flags & ALT_SIGN_EXT) ? 0 : 1)) | A(src1) | compiler->imm));
    262 			return push_inst(compiler, ADDI | D(dst) | A(src1) | (-compiler->imm & 0xffff));
    263 		}
    264 		if (flags & ALT_FORM7) {
    265 			FAIL_IF(push_inst(compiler, CMPL | CRD(0 | ((flags & ALT_SIGN_EXT) ? 0 : 1)) | A(src1) | B(src2)));
    266 			return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
    267 		}
    268 		if (!(flags & ALT_SET_FLAGS))
    269 			return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
    270 		BIN_EXTS();
    271 		return push_inst(compiler, SUBFC | OERC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
    272 
    273 	case SLJIT_SUBC:
    274 		BIN_EXTS();
    275 		return push_inst(compiler, SUBFE | D(dst) | A(src2) | B(src1));
    276 
    277 	case SLJIT_MUL:
    278 		if (flags & ALT_FORM1) {
    279 			SLJIT_ASSERT(src2 == TMP_REG2);
    280 			return push_inst(compiler, MULLI | D(dst) | A(src1) | compiler->imm);
    281 		}
    282 		BIN_EXTS();
    283 		if (flags & ALT_FORM2)
    284 			return push_inst(compiler, MULLW | OERC(flags) | D(dst) | A(src2) | B(src1));
    285 		return push_inst(compiler, MULLD | OERC(flags) | D(dst) | A(src2) | B(src1));
    286 
    287 	case SLJIT_AND:
    288 		if (flags & ALT_FORM1) {
    289 			SLJIT_ASSERT(src2 == TMP_REG2);
    290 			return push_inst(compiler, ANDI | S(src1) | A(dst) | compiler->imm);
    291 		}
    292 		if (flags & ALT_FORM2) {
    293 			SLJIT_ASSERT(src2 == TMP_REG2);
    294 			return push_inst(compiler, ANDIS | S(src1) | A(dst) | compiler->imm);
    295 		}
    296 		return push_inst(compiler, AND | RC(flags) | S(src1) | A(dst) | B(src2));
    297 
    298 	case SLJIT_OR:
    299 		if (flags & ALT_FORM1) {
    300 			SLJIT_ASSERT(src2 == TMP_REG2);
    301 			return push_inst(compiler, ORI | S(src1) | A(dst) | compiler->imm);
    302 		}
    303 		if (flags & ALT_FORM2) {
    304 			SLJIT_ASSERT(src2 == TMP_REG2);
    305 			return push_inst(compiler, ORIS | S(src1) | A(dst) | compiler->imm);
    306 		}
    307 		if (flags & ALT_FORM3) {
    308 			SLJIT_ASSERT(src2 == TMP_REG2);
    309 			FAIL_IF(push_inst(compiler, ORI | S(src1) | A(dst) | IMM(compiler->imm)));
    310 			return push_inst(compiler, ORIS | S(dst) | A(dst) | IMM(compiler->imm >> 16));
    311 		}
    312 		return push_inst(compiler, OR | RC(flags) | S(src1) | A(dst) | B(src2));
    313 
    314 	case SLJIT_XOR:
    315 		if (flags & ALT_FORM1) {
    316 			SLJIT_ASSERT(src2 == TMP_REG2);
    317 			return push_inst(compiler, XORI | S(src1) | A(dst) | compiler->imm);
    318 		}
    319 		if (flags & ALT_FORM2) {
    320 			SLJIT_ASSERT(src2 == TMP_REG2);
    321 			return push_inst(compiler, XORIS | S(src1) | A(dst) | compiler->imm);
    322 		}
    323 		if (flags & ALT_FORM3) {
    324 			SLJIT_ASSERT(src2 == TMP_REG2);
    325 			FAIL_IF(push_inst(compiler, XORI | S(src1) | A(dst) | IMM(compiler->imm)));
    326 			return push_inst(compiler, XORIS | S(dst) | A(dst) | IMM(compiler->imm >> 16));
    327 		}
    328 		return push_inst(compiler, XOR | RC(flags) | S(src1) | A(dst) | B(src2));
    329 
    330 	case SLJIT_SHL:
    331 		if (flags & ALT_FORM1) {
    332 			SLJIT_ASSERT(src2 == TMP_REG2);
    333 			if (flags & ALT_FORM2) {
    334 				compiler->imm &= 0x1f;
    335 				return push_inst(compiler, RLWINM | RC(flags) | S(src1) | A(dst) | (compiler->imm << 11) | ((31 - compiler->imm) << 1));
    336 			}
    337 			compiler->imm &= 0x3f;
    338 			return push_inst(compiler, RLDI(dst, src1, compiler->imm, 63 - compiler->imm, 1) | RC(flags));
    339 		}
    340 		return push_inst(compiler, ((flags & ALT_FORM2) ? SLW : SLD) | RC(flags) | S(src1) | A(dst) | B(src2));
    341 
    342 	case SLJIT_LSHR:
    343 		if (flags & ALT_FORM1) {
    344 			SLJIT_ASSERT(src2 == TMP_REG2);
    345 			if (flags & ALT_FORM2) {
    346 				compiler->imm &= 0x1f;
    347 				return push_inst(compiler, RLWINM | RC(flags) | S(src1) | A(dst) | (((32 - compiler->imm) & 0x1f) << 11) | (compiler->imm << 6) | (31 << 1));
    348 			}
    349 			compiler->imm &= 0x3f;
    350 			return push_inst(compiler, RLDI(dst, src1, 64 - compiler->imm, compiler->imm, 0) | RC(flags));
    351 		}
    352 		return push_inst(compiler, ((flags & ALT_FORM2) ? SRW : SRD) | RC(flags) | S(src1) | A(dst) | B(src2));
    353 
    354 	case SLJIT_ASHR:
    355 		if (flags & ALT_FORM1) {
    356 			SLJIT_ASSERT(src2 == TMP_REG2);
    357 			if (flags & ALT_FORM2) {
    358 				compiler->imm &= 0x1f;
    359 				return push_inst(compiler, SRAWI | RC(flags) | S(src1) | A(dst) | (compiler->imm << 11));
    360 			}
    361 			compiler->imm &= 0x3f;
    362 			return push_inst(compiler, SRADI | RC(flags) | S(src1) | A(dst) | ((compiler->imm & 0x1f) << 11) | ((compiler->imm & 0x20) >> 4));
    363 		}
    364 		return push_inst(compiler, ((flags & ALT_FORM2) ? SRAW : SRAD) | RC(flags) | S(src1) | A(dst) | B(src2));
    365 	}
    366 
    367 	SLJIT_UNREACHABLE();
    368 	return SLJIT_SUCCESS;
    369 }
    370 
    371 static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw init_value)
    372 {
    373 	FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(init_value >> 48)));
    374 	FAIL_IF(push_inst(compiler, ORI | S(reg) | A(reg) | IMM(init_value >> 32)));
    375 	FAIL_IF(PUSH_RLDICR(reg, 31));
    376 	FAIL_IF(push_inst(compiler, ORIS | S(reg) | A(reg) | IMM(init_value >> 16)));
    377 	return push_inst(compiler, ORI | S(reg) | A(reg) | IMM(init_value));
    378 }
    379 
    380 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
    381 {
    382 	sljit_ins *inst = (sljit_ins*)addr;
    383 
    384 	inst[0] = (inst[0] & 0xffff0000) | ((new_target >> 48) & 0xffff);
    385 	inst[1] = (inst[1] & 0xffff0000) | ((new_target >> 32) & 0xffff);
    386 	inst[3] = (inst[3] & 0xffff0000) | ((new_target >> 16) & 0xffff);
    387 	inst[4] = (inst[4] & 0xffff0000) | (new_target & 0xffff);
    388 	inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
    389 	SLJIT_CACHE_FLUSH(inst, inst + 5);
    390 }
    391 
    392 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant, sljit_sw executable_offset)
    393 {
    394 	sljit_ins *inst = (sljit_ins*)addr;
    395 
    396 	inst[0] = (inst[0] & 0xffff0000) | ((new_constant >> 48) & 0xffff);
    397 	inst[1] = (inst[1] & 0xffff0000) | ((new_constant >> 32) & 0xffff);
    398 	inst[3] = (inst[3] & 0xffff0000) | ((new_constant >> 16) & 0xffff);
    399 	inst[4] = (inst[4] & 0xffff0000) | (new_constant & 0xffff);
    400 	inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
    401 	SLJIT_CACHE_FLUSH(inst, inst + 5);
    402 }
    403