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      1 /*
      2  *    Stack-less Just-In-Time compiler
      3  *
      4  *    Copyright 2009-2012 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 SLJIT_API_FUNC_ATTRIBUTE SLJIT_CONST char* sljit_get_platform_name(void)
     28 {
     29 	return "ARM-Thumb2" SLJIT_CPUINFO;
     30 }
     31 
     32 /* Length of an instruction word. */
     33 typedef sljit_ui sljit_ins;
     34 
     35 /* Last register + 1. */
     36 #define TMP_REG1	(SLJIT_NUMBER_OF_REGISTERS + 2)
     37 #define TMP_REG2	(SLJIT_NUMBER_OF_REGISTERS + 3)
     38 #define TMP_REG3	(SLJIT_NUMBER_OF_REGISTERS + 4)
     39 #define TMP_PC		(SLJIT_NUMBER_OF_REGISTERS + 5)
     40 
     41 #define TMP_FREG1	(0)
     42 #define TMP_FREG2	(SLJIT_NUMBER_OF_FLOAT_REGISTERS + 1)
     43 
     44 /* See sljit_emit_enter and sljit_emit_op0 if you want to change them. */
     45 static SLJIT_CONST sljit_ub reg_map[SLJIT_NUMBER_OF_REGISTERS + 6] = {
     46 	0, 0, 1, 2, 12, 11, 10, 9, 8, 7, 6, 5, 13, 3, 4, 14, 15
     47 };
     48 
     49 #define COPY_BITS(src, from, to, bits) \
     50 	((from >= to ? (src >> (from - to)) : (src << (to - from))) & (((1 << bits) - 1) << to))
     51 
     52 /* Thumb16 encodings. */
     53 #define RD3(rd) (reg_map[rd])
     54 #define RN3(rn) (reg_map[rn] << 3)
     55 #define RM3(rm) (reg_map[rm] << 6)
     56 #define RDN3(rdn) (reg_map[rdn] << 8)
     57 #define IMM3(imm) (imm << 6)
     58 #define IMM8(imm) (imm)
     59 
     60 /* Thumb16 helpers. */
     61 #define SET_REGS44(rd, rn) \
     62 	((reg_map[rn] << 3) | (reg_map[rd] & 0x7) | ((reg_map[rd] & 0x8) << 4))
     63 #define IS_2_LO_REGS(reg1, reg2) \
     64 	(reg_map[reg1] <= 7 && reg_map[reg2] <= 7)
     65 #define IS_3_LO_REGS(reg1, reg2, reg3) \
     66 	(reg_map[reg1] <= 7 && reg_map[reg2] <= 7 && reg_map[reg3] <= 7)
     67 
     68 /* Thumb32 encodings. */
     69 #define RD4(rd) (reg_map[rd] << 8)
     70 #define RN4(rn) (reg_map[rn] << 16)
     71 #define RM4(rm) (reg_map[rm])
     72 #define RT4(rt) (reg_map[rt] << 12)
     73 #define DD4(dd) ((dd) << 12)
     74 #define DN4(dn) ((dn) << 16)
     75 #define DM4(dm) (dm)
     76 #define IMM5(imm) \
     77 	(COPY_BITS(imm, 2, 12, 3) | ((imm & 0x3) << 6))
     78 #define IMM12(imm) \
     79 	(COPY_BITS(imm, 11, 26, 1) | COPY_BITS(imm, 8, 12, 3) | (imm & 0xff))
     80 
     81 /* --------------------------------------------------------------------- */
     82 /*  Instrucion forms                                                     */
     83 /* --------------------------------------------------------------------- */
     84 
     85 /* dot '.' changed to _
     86    I immediate form (possibly followed by number of immediate bits). */
     87 #define ADCI		0xf1400000
     88 #define ADCS		0x4140
     89 #define ADC_W		0xeb400000
     90 #define ADD		0x4400
     91 #define ADDS		0x1800
     92 #define ADDSI3		0x1c00
     93 #define ADDSI8		0x3000
     94 #define ADD_W		0xeb000000
     95 #define ADDWI		0xf2000000
     96 #define ADD_SP		0xb000
     97 #define ADD_W		0xeb000000
     98 #define ADD_WI		0xf1000000
     99 #define ANDI		0xf0000000
    100 #define ANDS		0x4000
    101 #define AND_W		0xea000000
    102 #define ASRS		0x4100
    103 #define ASRSI		0x1000
    104 #define ASR_W		0xfa40f000
    105 #define ASR_WI		0xea4f0020
    106 #define BICI		0xf0200000
    107 #define BKPT		0xbe00
    108 #define BLX		0x4780
    109 #define BX		0x4700
    110 #define CLZ		0xfab0f080
    111 #define CMPI		0x2800
    112 #define CMP_W		0xebb00f00
    113 #define EORI		0xf0800000
    114 #define EORS		0x4040
    115 #define EOR_W		0xea800000
    116 #define IT		0xbf00
    117 #define LSLS		0x4080
    118 #define LSLSI		0x0000
    119 #define LSL_W		0xfa00f000
    120 #define LSL_WI		0xea4f0000
    121 #define LSRS		0x40c0
    122 #define LSRSI		0x0800
    123 #define LSR_W		0xfa20f000
    124 #define LSR_WI		0xea4f0010
    125 #define MOV		0x4600
    126 #define MOVS		0x0000
    127 #define MOVSI		0x2000
    128 #define MOVT		0xf2c00000
    129 #define MOVW		0xf2400000
    130 #define MOV_W		0xea4f0000
    131 #define MOV_WI		0xf04f0000
    132 #define MUL		0xfb00f000
    133 #define MVNS		0x43c0
    134 #define MVN_W		0xea6f0000
    135 #define MVN_WI		0xf06f0000
    136 #define NOP		0xbf00
    137 #define ORNI		0xf0600000
    138 #define ORRI		0xf0400000
    139 #define ORRS		0x4300
    140 #define ORR_W		0xea400000
    141 #define POP		0xbc00
    142 #define POP_W		0xe8bd0000
    143 #define PUSH		0xb400
    144 #define PUSH_W		0xe92d0000
    145 #define RSB_WI		0xf1c00000
    146 #define RSBSI		0x4240
    147 #define SBCI		0xf1600000
    148 #define SBCS		0x4180
    149 #define SBC_W		0xeb600000
    150 #define SMULL		0xfb800000
    151 #define STR_SP		0x9000
    152 #define SUBS		0x1a00
    153 #define SUBSI3		0x1e00
    154 #define SUBSI8		0x3800
    155 #define SUB_W		0xeba00000
    156 #define SUBWI		0xf2a00000
    157 #define SUB_SP		0xb080
    158 #define SUB_WI		0xf1a00000
    159 #define SXTB		0xb240
    160 #define SXTB_W		0xfa4ff080
    161 #define SXTH		0xb200
    162 #define SXTH_W		0xfa0ff080
    163 #define TST		0x4200
    164 #define UMULL		0xfba00000
    165 #define UXTB		0xb2c0
    166 #define UXTB_W		0xfa5ff080
    167 #define UXTH		0xb280
    168 #define UXTH_W		0xfa1ff080
    169 #define VABS_F32	0xeeb00ac0
    170 #define VADD_F32	0xee300a00
    171 #define VCMP_F32	0xeeb40a40
    172 #define VCVT_F32_S32	0xeeb80ac0
    173 #define VCVT_F64_F32	0xeeb70ac0
    174 #define VCVT_S32_F32	0xeebd0ac0
    175 #define VDIV_F32	0xee800a00
    176 #define VMOV_F32	0xeeb00a40
    177 #define VMOV		0xee000a10
    178 #define VMRS		0xeef1fa10
    179 #define VMUL_F32	0xee200a00
    180 #define VNEG_F32	0xeeb10a40
    181 #define VSTR_F32	0xed000a00
    182 #define VSUB_F32	0xee300a40
    183 
    184 static sljit_si push_inst16(struct sljit_compiler *compiler, sljit_ins inst)
    185 {
    186 	sljit_uh *ptr;
    187 	SLJIT_ASSERT(!(inst & 0xffff0000));
    188 
    189 	ptr = (sljit_uh*)ensure_buf(compiler, sizeof(sljit_uh));
    190 	FAIL_IF(!ptr);
    191 	*ptr = inst;
    192 	compiler->size++;
    193 	return SLJIT_SUCCESS;
    194 }
    195 
    196 static sljit_si push_inst32(struct sljit_compiler *compiler, sljit_ins inst)
    197 {
    198 	sljit_uh *ptr = (sljit_uh*)ensure_buf(compiler, sizeof(sljit_ins));
    199 	FAIL_IF(!ptr);
    200 	*ptr++ = inst >> 16;
    201 	*ptr = inst;
    202 	compiler->size += 2;
    203 	return SLJIT_SUCCESS;
    204 }
    205 
    206 static SLJIT_INLINE sljit_si emit_imm32_const(struct sljit_compiler *compiler, sljit_si dst, sljit_uw imm)
    207 {
    208 	FAIL_IF(push_inst32(compiler, MOVW | RD4(dst) |
    209 		COPY_BITS(imm, 12, 16, 4) | COPY_BITS(imm, 11, 26, 1) | COPY_BITS(imm, 8, 12, 3) | (imm & 0xff)));
    210 	return push_inst32(compiler, MOVT | RD4(dst) |
    211 		COPY_BITS(imm, 12 + 16, 16, 4) | COPY_BITS(imm, 11 + 16, 26, 1) | COPY_BITS(imm, 8 + 16, 12, 3) | ((imm & 0xff0000) >> 16));
    212 }
    213 
    214 static SLJIT_INLINE void modify_imm32_const(sljit_uh *inst, sljit_uw new_imm)
    215 {
    216 	sljit_si dst = inst[1] & 0x0f00;
    217 	SLJIT_ASSERT(((inst[0] & 0xfbf0) == (MOVW >> 16)) && ((inst[2] & 0xfbf0) == (MOVT >> 16)) && dst == (inst[3] & 0x0f00));
    218 	inst[0] = (MOVW >> 16) | COPY_BITS(new_imm, 12, 0, 4) | COPY_BITS(new_imm, 11, 10, 1);
    219 	inst[1] = dst | COPY_BITS(new_imm, 8, 12, 3) | (new_imm & 0xff);
    220 	inst[2] = (MOVT >> 16) | COPY_BITS(new_imm, 12 + 16, 0, 4) | COPY_BITS(new_imm, 11 + 16, 10, 1);
    221 	inst[3] = dst | COPY_BITS(new_imm, 8 + 16, 12, 3) | ((new_imm & 0xff0000) >> 16);
    222 }
    223 
    224 static SLJIT_INLINE sljit_si detect_jump_type(struct sljit_jump *jump, sljit_uh *code_ptr, sljit_uh *code)
    225 {
    226 	sljit_sw diff;
    227 
    228 	if (jump->flags & SLJIT_REWRITABLE_JUMP)
    229 		return 0;
    230 
    231 	if (jump->flags & JUMP_ADDR) {
    232 		/* Branch to ARM code is not optimized yet. */
    233 		if (!(jump->u.target & 0x1))
    234 			return 0;
    235 		diff = ((sljit_sw)jump->u.target - (sljit_sw)(code_ptr + 2)) >> 1;
    236 	}
    237 	else {
    238 		SLJIT_ASSERT(jump->flags & JUMP_LABEL);
    239 		diff = ((sljit_sw)(code + jump->u.label->size) - (sljit_sw)(code_ptr + 2)) >> 1;
    240 	}
    241 
    242 	if (jump->flags & IS_COND) {
    243 		SLJIT_ASSERT(!(jump->flags & IS_BL));
    244 		if (diff <= 127 && diff >= -128) {
    245 			jump->flags |= PATCH_TYPE1;
    246 			return 5;
    247 		}
    248 		if (diff <= 524287 && diff >= -524288) {
    249 			jump->flags |= PATCH_TYPE2;
    250 			return 4;
    251 		}
    252 		/* +1 comes from the prefix IT instruction. */
    253 		diff--;
    254 		if (diff <= 8388607 && diff >= -8388608) {
    255 			jump->flags |= PATCH_TYPE3;
    256 			return 3;
    257 		}
    258 	}
    259 	else if (jump->flags & IS_BL) {
    260 		if (diff <= 8388607 && diff >= -8388608) {
    261 			jump->flags |= PATCH_BL;
    262 			return 3;
    263 		}
    264 	}
    265 	else {
    266 		if (diff <= 1023 && diff >= -1024) {
    267 			jump->flags |= PATCH_TYPE4;
    268 			return 4;
    269 		}
    270 		if (diff <= 8388607 && diff >= -8388608) {
    271 			jump->flags |= PATCH_TYPE5;
    272 			return 3;
    273 		}
    274 	}
    275 
    276 	return 0;
    277 }
    278 
    279 static SLJIT_INLINE void set_jump_instruction(struct sljit_jump *jump)
    280 {
    281 	sljit_si type = (jump->flags >> 4) & 0xf;
    282 	sljit_sw diff;
    283 	sljit_uh *jump_inst;
    284 	sljit_si s, j1, j2;
    285 
    286 	if (SLJIT_UNLIKELY(type == 0)) {
    287 		modify_imm32_const((sljit_uh*)jump->addr, (jump->flags & JUMP_LABEL) ? jump->u.label->addr : jump->u.target);
    288 		return;
    289 	}
    290 
    291 	if (jump->flags & JUMP_ADDR) {
    292 		SLJIT_ASSERT(jump->u.target & 0x1);
    293 		diff = ((sljit_sw)jump->u.target - (sljit_sw)(jump->addr + 4)) >> 1;
    294 	}
    295 	else
    296 		diff = ((sljit_sw)(jump->u.label->addr) - (sljit_sw)(jump->addr + 4)) >> 1;
    297 	jump_inst = (sljit_uh*)jump->addr;
    298 
    299 	switch (type) {
    300 	case 1:
    301 		/* Encoding T1 of 'B' instruction */
    302 		SLJIT_ASSERT(diff <= 127 && diff >= -128 && (jump->flags & IS_COND));
    303 		jump_inst[0] = 0xd000 | (jump->flags & 0xf00) | (diff & 0xff);
    304 		return;
    305 	case 2:
    306 		/* Encoding T3 of 'B' instruction */
    307 		SLJIT_ASSERT(diff <= 524287 && diff >= -524288 && (jump->flags & IS_COND));
    308 		jump_inst[0] = 0xf000 | COPY_BITS(jump->flags, 8, 6, 4) | COPY_BITS(diff, 11, 0, 6) | COPY_BITS(diff, 19, 10, 1);
    309 		jump_inst[1] = 0x8000 | COPY_BITS(diff, 17, 13, 1) | COPY_BITS(diff, 18, 11, 1) | (diff & 0x7ff);
    310 		return;
    311 	case 3:
    312 		SLJIT_ASSERT(jump->flags & IS_COND);
    313 		*jump_inst++ = IT | ((jump->flags >> 4) & 0xf0) | 0x8;
    314 		diff--;
    315 		type = 5;
    316 		break;
    317 	case 4:
    318 		/* Encoding T2 of 'B' instruction */
    319 		SLJIT_ASSERT(diff <= 1023 && diff >= -1024 && !(jump->flags & IS_COND));
    320 		jump_inst[0] = 0xe000 | (diff & 0x7ff);
    321 		return;
    322 	}
    323 
    324 	SLJIT_ASSERT(diff <= 8388607 && diff >= -8388608);
    325 
    326 	/* Really complex instruction form for branches. */
    327 	s = (diff >> 23) & 0x1;
    328 	j1 = (~(diff >> 21) ^ s) & 0x1;
    329 	j2 = (~(diff >> 22) ^ s) & 0x1;
    330 	jump_inst[0] = 0xf000 | (s << 10) | COPY_BITS(diff, 11, 0, 10);
    331 	jump_inst[1] = (j1 << 13) | (j2 << 11) | (diff & 0x7ff);
    332 
    333 	/* The others have a common form. */
    334 	if (type == 5) /* Encoding T4 of 'B' instruction */
    335 		jump_inst[1] |= 0x9000;
    336 	else if (type == 6) /* Encoding T1 of 'BL' instruction */
    337 		jump_inst[1] |= 0xd000;
    338 	else
    339 		SLJIT_ASSERT_STOP();
    340 }
    341 
    342 SLJIT_API_FUNC_ATTRIBUTE void* sljit_generate_code(struct sljit_compiler *compiler)
    343 {
    344 	struct sljit_memory_fragment *buf;
    345 	sljit_uh *code;
    346 	sljit_uh *code_ptr;
    347 	sljit_uh *buf_ptr;
    348 	sljit_uh *buf_end;
    349 	sljit_uw half_count;
    350 
    351 	struct sljit_label *label;
    352 	struct sljit_jump *jump;
    353 	struct sljit_const *const_;
    354 
    355 	CHECK_ERROR_PTR();
    356 	check_sljit_generate_code(compiler);
    357 	reverse_buf(compiler);
    358 
    359 	code = (sljit_uh*)SLJIT_MALLOC_EXEC(compiler->size * sizeof(sljit_uh));
    360 	PTR_FAIL_WITH_EXEC_IF(code);
    361 	buf = compiler->buf;
    362 
    363 	code_ptr = code;
    364 	half_count = 0;
    365 	label = compiler->labels;
    366 	jump = compiler->jumps;
    367 	const_ = compiler->consts;
    368 
    369 	do {
    370 		buf_ptr = (sljit_uh*)buf->memory;
    371 		buf_end = buf_ptr + (buf->used_size >> 1);
    372 		do {
    373 			*code_ptr = *buf_ptr++;
    374 			/* These structures are ordered by their address. */
    375 			SLJIT_ASSERT(!label || label->size >= half_count);
    376 			SLJIT_ASSERT(!jump || jump->addr >= half_count);
    377 			SLJIT_ASSERT(!const_ || const_->addr >= half_count);
    378 			if (label && label->size == half_count) {
    379 				label->addr = ((sljit_uw)code_ptr) | 0x1;
    380 				label->size = code_ptr - code;
    381 				label = label->next;
    382 			}
    383 			if (jump && jump->addr == half_count) {
    384 					jump->addr = (sljit_uw)code_ptr - ((jump->flags & IS_COND) ? 10 : 8);
    385 					code_ptr -= detect_jump_type(jump, code_ptr, code);
    386 					jump = jump->next;
    387 			}
    388 			if (const_ && const_->addr == half_count) {
    389 				const_->addr = (sljit_uw)code_ptr;
    390 				const_ = const_->next;
    391 			}
    392 			code_ptr ++;
    393 			half_count ++;
    394 		} while (buf_ptr < buf_end);
    395 
    396 		buf = buf->next;
    397 	} while (buf);
    398 
    399 	if (label && label->size == half_count) {
    400 		label->addr = ((sljit_uw)code_ptr) | 0x1;
    401 		label->size = code_ptr - code;
    402 		label = label->next;
    403 	}
    404 
    405 	SLJIT_ASSERT(!label);
    406 	SLJIT_ASSERT(!jump);
    407 	SLJIT_ASSERT(!const_);
    408 	SLJIT_ASSERT(code_ptr - code <= (sljit_sw)compiler->size);
    409 
    410 	jump = compiler->jumps;
    411 	while (jump) {
    412 		set_jump_instruction(jump);
    413 		jump = jump->next;
    414 	}
    415 
    416 	compiler->error = SLJIT_ERR_COMPILED;
    417 	compiler->executable_size = (code_ptr - code) * sizeof(sljit_uh);
    418 	SLJIT_CACHE_FLUSH(code, code_ptr);
    419 	/* Set thumb mode flag. */
    420 	return (void*)((sljit_uw)code | 0x1);
    421 }
    422 
    423 /* --------------------------------------------------------------------- */
    424 /*  Core code generator functions.                                       */
    425 /* --------------------------------------------------------------------- */
    426 
    427 #define INVALID_IMM	0x80000000
    428 static sljit_uw get_imm(sljit_uw imm)
    429 {
    430 	/* Thumb immediate form. */
    431 	sljit_si counter;
    432 
    433 	if (imm <= 0xff)
    434 		return imm;
    435 
    436 	if ((imm & 0xffff) == (imm >> 16)) {
    437 		/* Some special cases. */
    438 		if (!(imm & 0xff00))
    439 			return (1 << 12) | (imm & 0xff);
    440 		if (!(imm & 0xff))
    441 			return (2 << 12) | ((imm >> 8) & 0xff);
    442 		if ((imm & 0xff00) == ((imm & 0xff) << 8))
    443 			return (3 << 12) | (imm & 0xff);
    444 	}
    445 
    446 	/* Assembly optimization: count leading zeroes? */
    447 	counter = 8;
    448 	if (!(imm & 0xffff0000)) {
    449 		counter += 16;
    450 		imm <<= 16;
    451 	}
    452 	if (!(imm & 0xff000000)) {
    453 		counter += 8;
    454 		imm <<= 8;
    455 	}
    456 	if (!(imm & 0xf0000000)) {
    457 		counter += 4;
    458 		imm <<= 4;
    459 	}
    460 	if (!(imm & 0xc0000000)) {
    461 		counter += 2;
    462 		imm <<= 2;
    463 	}
    464 	if (!(imm & 0x80000000)) {
    465 		counter += 1;
    466 		imm <<= 1;
    467 	}
    468 	/* Since imm >= 128, this must be true. */
    469 	SLJIT_ASSERT(counter <= 31);
    470 
    471 	if (imm & 0x00ffffff)
    472 		return INVALID_IMM; /* Cannot be encoded. */
    473 
    474 	return ((imm >> 24) & 0x7f) | COPY_BITS(counter, 4, 26, 1) | COPY_BITS(counter, 1, 12, 3) | COPY_BITS(counter, 0, 7, 1);
    475 }
    476 
    477 static sljit_si load_immediate(struct sljit_compiler *compiler, sljit_si dst, sljit_uw imm)
    478 {
    479 	sljit_uw tmp;
    480 
    481 	if (imm >= 0x10000) {
    482 		tmp = get_imm(imm);
    483 		if (tmp != INVALID_IMM)
    484 			return push_inst32(compiler, MOV_WI | RD4(dst) | tmp);
    485 		tmp = get_imm(~imm);
    486 		if (tmp != INVALID_IMM)
    487 			return push_inst32(compiler, MVN_WI | RD4(dst) | tmp);
    488 	}
    489 
    490 	/* set low 16 bits, set hi 16 bits to 0. */
    491 	FAIL_IF(push_inst32(compiler, MOVW | RD4(dst) |
    492 		COPY_BITS(imm, 12, 16, 4) | COPY_BITS(imm, 11, 26, 1) | COPY_BITS(imm, 8, 12, 3) | (imm & 0xff)));
    493 
    494 	/* set hi 16 bit if needed. */
    495 	if (imm >= 0x10000)
    496 		return push_inst32(compiler, MOVT | RD4(dst) |
    497 			COPY_BITS(imm, 12 + 16, 16, 4) | COPY_BITS(imm, 11 + 16, 26, 1) | COPY_BITS(imm, 8 + 16, 12, 3) | ((imm & 0xff0000) >> 16));
    498 	return SLJIT_SUCCESS;
    499 }
    500 
    501 #define ARG1_IMM	0x0010000
    502 #define ARG2_IMM	0x0020000
    503 #define KEEP_FLAGS	0x0040000
    504 /* SET_FLAGS must be 0x100000 as it is also the value of S bit (can be used for optimization). */
    505 #define SET_FLAGS	0x0100000
    506 #define UNUSED_RETURN	0x0200000
    507 #define SLOW_DEST	0x0400000
    508 #define SLOW_SRC1	0x0800000
    509 #define SLOW_SRC2	0x1000000
    510 
    511 static sljit_si emit_op_imm(struct sljit_compiler *compiler, sljit_si flags, sljit_si dst, sljit_uw arg1, sljit_uw arg2)
    512 {
    513 	/* dst must be register, TMP_REG1
    514 	   arg1 must be register, TMP_REG1, imm
    515 	   arg2 must be register, TMP_REG2, imm */
    516 	sljit_si reg;
    517 	sljit_uw imm, nimm;
    518 
    519 	if (SLJIT_UNLIKELY((flags & (ARG1_IMM | ARG2_IMM)) == (ARG1_IMM | ARG2_IMM))) {
    520 		/* Both are immediates. */
    521 		flags &= ~ARG1_IMM;
    522 		FAIL_IF(load_immediate(compiler, TMP_REG1, arg1));
    523 		arg1 = TMP_REG1;
    524 	}
    525 
    526 	if (flags & (ARG1_IMM | ARG2_IMM)) {
    527 		reg = (flags & ARG2_IMM) ? arg1 : arg2;
    528 		imm = (flags & ARG2_IMM) ? arg2 : arg1;
    529 
    530 		switch (flags & 0xffff) {
    531 		case SLJIT_CLZ:
    532 		case SLJIT_MUL:
    533 			/* No form with immediate operand. */
    534 			break;
    535 		case SLJIT_MOV:
    536 			SLJIT_ASSERT(!(flags & SET_FLAGS) && (flags & ARG2_IMM) && arg1 == TMP_REG1);
    537 			return load_immediate(compiler, dst, imm);
    538 		case SLJIT_NOT:
    539 			if (!(flags & SET_FLAGS))
    540 				return load_immediate(compiler, dst, ~imm);
    541 			/* Since the flags should be set, we just fallback to the register mode.
    542 			   Although some clever things could be done here, "NOT IMM" does not worth the efforts. */
    543 			break;
    544 		case SLJIT_ADD:
    545 			nimm = -imm;
    546 			if (!(flags & KEEP_FLAGS) && IS_2_LO_REGS(reg, dst)) {
    547 				if (imm <= 0x7)
    548 					return push_inst16(compiler, ADDSI3 | IMM3(imm) | RD3(dst) | RN3(reg));
    549 				if (nimm <= 0x7)
    550 					return push_inst16(compiler, SUBSI3 | IMM3(nimm) | RD3(dst) | RN3(reg));
    551 				if (reg == dst) {
    552 					if (imm <= 0xff)
    553 						return push_inst16(compiler, ADDSI8 | IMM8(imm) | RDN3(dst));
    554 					if (nimm <= 0xff)
    555 						return push_inst16(compiler, SUBSI8 | IMM8(nimm) | RDN3(dst));
    556 				}
    557 			}
    558 			if (!(flags & SET_FLAGS)) {
    559 				if (imm <= 0xfff)
    560 					return push_inst32(compiler, ADDWI | RD4(dst) | RN4(reg) | IMM12(imm));
    561 				if (nimm <= 0xfff)
    562 					return push_inst32(compiler, SUBWI | RD4(dst) | RN4(reg) | IMM12(nimm));
    563 			}
    564 			imm = get_imm(imm);
    565 			if (imm != INVALID_IMM)
    566 				return push_inst32(compiler, ADD_WI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | imm);
    567 			break;
    568 		case SLJIT_ADDC:
    569 			imm = get_imm(imm);
    570 			if (imm != INVALID_IMM)
    571 				return push_inst32(compiler, ADCI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | imm);
    572 			break;
    573 		case SLJIT_SUB:
    574 			if (flags & ARG1_IMM) {
    575 				if (!(flags & KEEP_FLAGS) && imm == 0 && IS_2_LO_REGS(reg, dst))
    576 					return push_inst16(compiler, RSBSI | RD3(dst) | RN3(reg));
    577 				imm = get_imm(imm);
    578 				if (imm != INVALID_IMM)
    579 					return push_inst32(compiler, RSB_WI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | imm);
    580 				break;
    581 			}
    582 			nimm = -imm;
    583 			if (!(flags & KEEP_FLAGS) && IS_2_LO_REGS(reg, dst)) {
    584 				if (imm <= 0x7)
    585 					return push_inst16(compiler, SUBSI3 | IMM3(imm) | RD3(dst) | RN3(reg));
    586 				if (nimm <= 0x7)
    587 					return push_inst16(compiler, ADDSI3 | IMM3(nimm) | RD3(dst) | RN3(reg));
    588 				if (reg == dst) {
    589 					if (imm <= 0xff)
    590 						return push_inst16(compiler, SUBSI8 | IMM8(imm) | RDN3(dst));
    591 					if (nimm <= 0xff)
    592 						return push_inst16(compiler, ADDSI8 | IMM8(nimm) | RDN3(dst));
    593 				}
    594 				if (imm <= 0xff && (flags & UNUSED_RETURN))
    595 					return push_inst16(compiler, CMPI | IMM8(imm) | RDN3(reg));
    596 			}
    597 			if (!(flags & SET_FLAGS)) {
    598 				if (imm <= 0xfff)
    599 					return push_inst32(compiler, SUBWI | RD4(dst) | RN4(reg) | IMM12(imm));
    600 				if (nimm <= 0xfff)
    601 					return push_inst32(compiler, ADDWI | RD4(dst) | RN4(reg) | IMM12(nimm));
    602 			}
    603 			imm = get_imm(imm);
    604 			if (imm != INVALID_IMM)
    605 				return push_inst32(compiler, SUB_WI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | imm);
    606 			break;
    607 		case SLJIT_SUBC:
    608 			if (flags & ARG1_IMM)
    609 				break;
    610 			imm = get_imm(imm);
    611 			if (imm != INVALID_IMM)
    612 				return push_inst32(compiler, SBCI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | imm);
    613 			break;
    614 		case SLJIT_AND:
    615 			nimm = get_imm(imm);
    616 			if (nimm != INVALID_IMM)
    617 				return push_inst32(compiler, ANDI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | nimm);
    618 			imm = get_imm(imm);
    619 			if (imm != INVALID_IMM)
    620 				return push_inst32(compiler, BICI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | imm);
    621 			break;
    622 		case SLJIT_OR:
    623 			nimm = get_imm(imm);
    624 			if (nimm != INVALID_IMM)
    625 				return push_inst32(compiler, ORRI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | nimm);
    626 			imm = get_imm(imm);
    627 			if (imm != INVALID_IMM)
    628 				return push_inst32(compiler, ORNI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | imm);
    629 			break;
    630 		case SLJIT_XOR:
    631 			imm = get_imm(imm);
    632 			if (imm != INVALID_IMM)
    633 				return push_inst32(compiler, EORI | (flags & SET_FLAGS) | RD4(dst) | RN4(reg) | imm);
    634 			break;
    635 		case SLJIT_SHL:
    636 		case SLJIT_LSHR:
    637 		case SLJIT_ASHR:
    638 			if (flags & ARG1_IMM)
    639 				break;
    640 			imm &= 0x1f;
    641 			if (imm == 0) {
    642 				if (!(flags & SET_FLAGS))
    643 					return push_inst16(compiler, MOV | SET_REGS44(dst, reg));
    644 				if (IS_2_LO_REGS(dst, reg))
    645 					return push_inst16(compiler, MOVS | RD3(dst) | RN3(reg));
    646 				return push_inst32(compiler, MOV_W | SET_FLAGS | RD4(dst) | RM4(reg));
    647 			}
    648 			switch (flags & 0xffff) {
    649 			case SLJIT_SHL:
    650 				if (!(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, reg))
    651 					return push_inst16(compiler, LSLSI | RD3(dst) | RN3(reg) | (imm << 6));
    652 				return push_inst32(compiler, LSL_WI | (flags & SET_FLAGS) | RD4(dst) | RM4(reg) | IMM5(imm));
    653 			case SLJIT_LSHR:
    654 				if (!(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, reg))
    655 					return push_inst16(compiler, LSRSI | RD3(dst) | RN3(reg) | (imm << 6));
    656 				return push_inst32(compiler, LSR_WI | (flags & SET_FLAGS) | RD4(dst) | RM4(reg) | IMM5(imm));
    657 			default: /* SLJIT_ASHR */
    658 				if (!(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, reg))
    659 					return push_inst16(compiler, ASRSI | RD3(dst) | RN3(reg) | (imm << 6));
    660 				return push_inst32(compiler, ASR_WI | (flags & SET_FLAGS) | RD4(dst) | RM4(reg) | IMM5(imm));
    661 			}
    662 		default:
    663 			SLJIT_ASSERT_STOP();
    664 			break;
    665 		}
    666 
    667 		if (flags & ARG2_IMM) {
    668 			FAIL_IF(load_immediate(compiler, TMP_REG2, arg2));
    669 			arg2 = TMP_REG2;
    670 		}
    671 		else {
    672 			FAIL_IF(load_immediate(compiler, TMP_REG1, arg1));
    673 			arg1 = TMP_REG1;
    674 		}
    675 	}
    676 
    677 	/* Both arguments are registers. */
    678 	switch (flags & 0xffff) {
    679 	case SLJIT_MOV:
    680 	case SLJIT_MOV_UI:
    681 	case SLJIT_MOV_SI:
    682 	case SLJIT_MOV_P:
    683 	case SLJIT_MOVU:
    684 	case SLJIT_MOVU_UI:
    685 	case SLJIT_MOVU_SI:
    686 	case SLJIT_MOVU_P:
    687 		SLJIT_ASSERT(!(flags & SET_FLAGS) && arg1 == TMP_REG1);
    688 		if (dst == arg2)
    689 			return SLJIT_SUCCESS;
    690 		return push_inst16(compiler, MOV | SET_REGS44(dst, arg2));
    691 	case SLJIT_MOV_UB:
    692 	case SLJIT_MOVU_UB:
    693 		SLJIT_ASSERT(!(flags & SET_FLAGS) && arg1 == TMP_REG1);
    694 		if (IS_2_LO_REGS(dst, arg2))
    695 			return push_inst16(compiler, UXTB | RD3(dst) | RN3(arg2));
    696 		return push_inst32(compiler, UXTB_W | RD4(dst) | RM4(arg2));
    697 	case SLJIT_MOV_SB:
    698 	case SLJIT_MOVU_SB:
    699 		SLJIT_ASSERT(!(flags & SET_FLAGS) && arg1 == TMP_REG1);
    700 		if (IS_2_LO_REGS(dst, arg2))
    701 			return push_inst16(compiler, SXTB | RD3(dst) | RN3(arg2));
    702 		return push_inst32(compiler, SXTB_W | RD4(dst) | RM4(arg2));
    703 	case SLJIT_MOV_UH:
    704 	case SLJIT_MOVU_UH:
    705 		SLJIT_ASSERT(!(flags & SET_FLAGS) && arg1 == TMP_REG1);
    706 		if (IS_2_LO_REGS(dst, arg2))
    707 			return push_inst16(compiler, UXTH | RD3(dst) | RN3(arg2));
    708 		return push_inst32(compiler, UXTH_W | RD4(dst) | RM4(arg2));
    709 	case SLJIT_MOV_SH:
    710 	case SLJIT_MOVU_SH:
    711 		SLJIT_ASSERT(!(flags & SET_FLAGS) && arg1 == TMP_REG1);
    712 		if (IS_2_LO_REGS(dst, arg2))
    713 			return push_inst16(compiler, SXTH | RD3(dst) | RN3(arg2));
    714 		return push_inst32(compiler, SXTH_W | RD4(dst) | RM4(arg2));
    715 	case SLJIT_NOT:
    716 		SLJIT_ASSERT(arg1 == TMP_REG1);
    717 		if (!(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, arg2))
    718 			return push_inst16(compiler, MVNS | RD3(dst) | RN3(arg2));
    719 		return push_inst32(compiler, MVN_W | (flags & SET_FLAGS) | RD4(dst) | RM4(arg2));
    720 	case SLJIT_CLZ:
    721 		SLJIT_ASSERT(arg1 == TMP_REG1);
    722 		FAIL_IF(push_inst32(compiler, CLZ | RN4(arg2) | RD4(dst) | RM4(arg2)));
    723 		if (flags & SET_FLAGS) {
    724 			if (reg_map[dst] <= 7)
    725 				return push_inst16(compiler, CMPI | RDN3(dst));
    726 			return push_inst32(compiler, ADD_WI | SET_FLAGS | RN4(dst) | RD4(dst));
    727 		}
    728 		return SLJIT_SUCCESS;
    729 	case SLJIT_ADD:
    730 		if (!(flags & KEEP_FLAGS) && IS_3_LO_REGS(dst, arg1, arg2))
    731 			return push_inst16(compiler, ADDS | RD3(dst) | RN3(arg1) | RM3(arg2));
    732 		if (dst == arg1 && !(flags & SET_FLAGS))
    733 			return push_inst16(compiler, ADD | SET_REGS44(dst, arg2));
    734 		return push_inst32(compiler, ADD_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    735 	case SLJIT_ADDC:
    736 		if (dst == arg1 && !(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, arg2))
    737 			return push_inst16(compiler, ADCS | RD3(dst) | RN3(arg2));
    738 		return push_inst32(compiler, ADC_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    739 	case SLJIT_SUB:
    740 		if (!(flags & KEEP_FLAGS) && IS_3_LO_REGS(dst, arg1, arg2))
    741 			return push_inst16(compiler, SUBS | RD3(dst) | RN3(arg1) | RM3(arg2));
    742 		return push_inst32(compiler, SUB_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    743 	case SLJIT_SUBC:
    744 		if (dst == arg1 && !(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, arg2))
    745 			return push_inst16(compiler, SBCS | RD3(dst) | RN3(arg2));
    746 		return push_inst32(compiler, SBC_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    747 	case SLJIT_MUL:
    748 		if (!(flags & SET_FLAGS))
    749 			return push_inst32(compiler, MUL | RD4(dst) | RN4(arg1) | RM4(arg2));
    750 		SLJIT_ASSERT(reg_map[TMP_REG2] <= 7 && dst != TMP_REG2);
    751 		FAIL_IF(push_inst32(compiler, SMULL | RT4(dst) | RD4(TMP_REG2) | RN4(arg1) | RM4(arg2)));
    752 		/* cmp TMP_REG2, dst asr #31. */
    753 		return push_inst32(compiler, CMP_W | RN4(TMP_REG2) | 0x70e0 | RM4(dst));
    754 	case SLJIT_AND:
    755 		if (!(flags & KEEP_FLAGS)) {
    756 			if (dst == arg1 && IS_2_LO_REGS(dst, arg2))
    757 				return push_inst16(compiler, ANDS | RD3(dst) | RN3(arg2));
    758 			if ((flags & UNUSED_RETURN) && IS_2_LO_REGS(arg1, arg2))
    759 				return push_inst16(compiler, TST | RD3(arg1) | RN3(arg2));
    760 		}
    761 		return push_inst32(compiler, AND_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    762 	case SLJIT_OR:
    763 		if (dst == arg1 && !(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, arg2))
    764 			return push_inst16(compiler, ORRS | RD3(dst) | RN3(arg2));
    765 		return push_inst32(compiler, ORR_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    766 	case SLJIT_XOR:
    767 		if (dst == arg1 && !(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, arg2))
    768 			return push_inst16(compiler, EORS | RD3(dst) | RN3(arg2));
    769 		return push_inst32(compiler, EOR_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    770 	case SLJIT_SHL:
    771 		if (dst == arg1 && !(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, arg2))
    772 			return push_inst16(compiler, LSLS | RD3(dst) | RN3(arg2));
    773 		return push_inst32(compiler, LSL_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    774 	case SLJIT_LSHR:
    775 		if (dst == arg1 && !(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, arg2))
    776 			return push_inst16(compiler, LSRS | RD3(dst) | RN3(arg2));
    777 		return push_inst32(compiler, LSR_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    778 	case SLJIT_ASHR:
    779 		if (dst == arg1 && !(flags & KEEP_FLAGS) && IS_2_LO_REGS(dst, arg2))
    780 			return push_inst16(compiler, ASRS | RD3(dst) | RN3(arg2));
    781 		return push_inst32(compiler, ASR_W | (flags & SET_FLAGS) | RD4(dst) | RN4(arg1) | RM4(arg2));
    782 	}
    783 
    784 	SLJIT_ASSERT_STOP();
    785 	return SLJIT_SUCCESS;
    786 }
    787 
    788 #define STORE		0x01
    789 #define SIGNED		0x02
    790 
    791 #define WORD_SIZE	0x00
    792 #define BYTE_SIZE	0x04
    793 #define HALF_SIZE	0x08
    794 
    795 #define UPDATE		0x10
    796 #define ARG_TEST	0x20
    797 
    798 #define IS_WORD_SIZE(flags)		(!(flags & (BYTE_SIZE | HALF_SIZE)))
    799 #define OFFSET_CHECK(imm, shift)	(!(argw & ~(imm << shift)))
    800 
    801 /*
    802   1st letter:
    803   w = word
    804   b = byte
    805   h = half
    806 
    807   2nd letter:
    808   s = signed
    809   u = unsigned
    810 
    811   3rd letter:
    812   l = load
    813   s = store
    814 */
    815 
    816 static SLJIT_CONST sljit_ins sljit_mem16[12] = {
    817 /* w u l */ 0x5800 /* ldr */,
    818 /* w u s */ 0x5000 /* str */,
    819 /* w s l */ 0x5800 /* ldr */,
    820 /* w s s */ 0x5000 /* str */,
    821 
    822 /* b u l */ 0x5c00 /* ldrb */,
    823 /* b u s */ 0x5400 /* strb */,
    824 /* b s l */ 0x5600 /* ldrsb */,
    825 /* b s s */ 0x5400 /* strb */,
    826 
    827 /* h u l */ 0x5a00 /* ldrh */,
    828 /* h u s */ 0x5200 /* strh */,
    829 /* h s l */ 0x5e00 /* ldrsh */,
    830 /* h s s */ 0x5200 /* strh */,
    831 };
    832 
    833 static SLJIT_CONST sljit_ins sljit_mem16_imm5[12] = {
    834 /* w u l */ 0x6800 /* ldr imm5 */,
    835 /* w u s */ 0x6000 /* str imm5 */,
    836 /* w s l */ 0x6800 /* ldr imm5 */,
    837 /* w s s */ 0x6000 /* str imm5 */,
    838 
    839 /* b u l */ 0x7800 /* ldrb imm5 */,
    840 /* b u s */ 0x7000 /* strb imm5 */,
    841 /* b s l */ 0x0000 /* not allowed */,
    842 /* b s s */ 0x7000 /* strb imm5 */,
    843 
    844 /* h u l */ 0x8800 /* ldrh imm5 */,
    845 /* h u s */ 0x8000 /* strh imm5 */,
    846 /* h s l */ 0x0000 /* not allowed */,
    847 /* h s s */ 0x8000 /* strh imm5 */,
    848 };
    849 
    850 #define MEM_IMM8	0xc00
    851 #define MEM_IMM12	0x800000
    852 static SLJIT_CONST sljit_ins sljit_mem32[12] = {
    853 /* w u l */ 0xf8500000 /* ldr.w */,
    854 /* w u s */ 0xf8400000 /* str.w */,
    855 /* w s l */ 0xf8500000 /* ldr.w */,
    856 /* w s s */ 0xf8400000 /* str.w */,
    857 
    858 /* b u l */ 0xf8100000 /* ldrb.w */,
    859 /* b u s */ 0xf8000000 /* strb.w */,
    860 /* b s l */ 0xf9100000 /* ldrsb.w */,
    861 /* b s s */ 0xf8000000 /* strb.w */,
    862 
    863 /* h u l */ 0xf8300000 /* ldrh.w */,
    864 /* h u s */ 0xf8200000 /* strsh.w */,
    865 /* h s l */ 0xf9300000 /* ldrsh.w */,
    866 /* h s s */ 0xf8200000 /* strsh.w */,
    867 };
    868 
    869 /* Helper function. Dst should be reg + value, using at most 1 instruction, flags does not set. */
    870 static sljit_si emit_set_delta(struct sljit_compiler *compiler, sljit_si dst, sljit_si reg, sljit_sw value)
    871 {
    872 	if (value >= 0) {
    873 		if (value <= 0xfff)
    874 			return push_inst32(compiler, ADDWI | RD4(dst) | RN4(reg) | IMM12(value));
    875 		value = get_imm(value);
    876 		if (value != INVALID_IMM)
    877 			return push_inst32(compiler, ADD_WI | RD4(dst) | RN4(reg) | value);
    878 	}
    879 	else {
    880 		value = -value;
    881 		if (value <= 0xfff)
    882 			return push_inst32(compiler, SUBWI | RD4(dst) | RN4(reg) | IMM12(value));
    883 		value = get_imm(value);
    884 		if (value != INVALID_IMM)
    885 			return push_inst32(compiler, SUB_WI | RD4(dst) | RN4(reg) | value);
    886 	}
    887 	return SLJIT_ERR_UNSUPPORTED;
    888 }
    889 
    890 /* Can perform an operation using at most 1 instruction. */
    891 static sljit_si getput_arg_fast(struct sljit_compiler *compiler, sljit_si flags, sljit_si reg, sljit_si arg, sljit_sw argw)
    892 {
    893 	sljit_si other_r, shift;
    894 
    895 	SLJIT_ASSERT(arg & SLJIT_MEM);
    896 
    897 	if (SLJIT_UNLIKELY(flags & UPDATE)) {
    898 		if ((arg & REG_MASK) && !(arg & OFFS_REG_MASK) && argw <= 0xff && argw >= -0xff) {
    899 			if (SLJIT_UNLIKELY(flags & ARG_TEST))
    900 				return 1;
    901 
    902 			flags &= ~UPDATE;
    903 			arg &= 0xf;
    904 			if (argw >= 0)
    905 				argw |= 0x200;
    906 			else {
    907 				argw = -argw;
    908 			}
    909 
    910 			SLJIT_ASSERT(argw >= 0 && (argw & 0xff) <= 0xff);
    911 			FAIL_IF(push_inst32(compiler, sljit_mem32[flags] | MEM_IMM8 | RT4(reg) | RN4(arg) | 0x100 | argw));
    912 			return -1;
    913 		}
    914 		return 0;
    915 	}
    916 
    917 	if (SLJIT_UNLIKELY(arg & OFFS_REG_MASK)) {
    918 		if (SLJIT_UNLIKELY(flags & ARG_TEST))
    919 			return 1;
    920 
    921 		argw &= 0x3;
    922 		other_r = OFFS_REG(arg);
    923 		arg &= 0xf;
    924 
    925 		if (!argw && IS_3_LO_REGS(reg, arg, other_r))
    926 			FAIL_IF(push_inst16(compiler, sljit_mem16[flags] | RD3(reg) | RN3(arg) | RM3(other_r)));
    927 		else
    928 			FAIL_IF(push_inst32(compiler, sljit_mem32[flags] | RT4(reg) | RN4(arg) | RM4(other_r) | (argw << 4)));
    929 		return -1;
    930 	}
    931 
    932 	if (!(arg & REG_MASK) || argw > 0xfff || argw < -0xff)
    933 		return 0;
    934 
    935 	if (SLJIT_UNLIKELY(flags & ARG_TEST))
    936 		return 1;
    937 
    938 	arg &= 0xf;
    939 	if (IS_2_LO_REGS(reg, arg) && sljit_mem16_imm5[flags]) {
    940 		shift = 3;
    941 		if (IS_WORD_SIZE(flags)) {
    942 			if (OFFSET_CHECK(0x1f, 2))
    943 				shift = 2;
    944 		}
    945 		else if (flags & BYTE_SIZE)
    946 		{
    947 			if (OFFSET_CHECK(0x1f, 0))
    948 				shift = 0;
    949 		}
    950 		else {
    951 			SLJIT_ASSERT(flags & HALF_SIZE);
    952 			if (OFFSET_CHECK(0x1f, 1))
    953 				shift = 1;
    954 		}
    955 
    956 		if (shift != 3) {
    957 			FAIL_IF(push_inst16(compiler, sljit_mem16_imm5[flags] | RD3(reg) | RN3(arg) | (argw << (6 - shift))));
    958 			return -1;
    959 		}
    960 	}
    961 
    962 	/* SP based immediate. */
    963 	if (SLJIT_UNLIKELY(arg == SLJIT_SP) && OFFSET_CHECK(0xff, 2) && IS_WORD_SIZE(flags) && reg_map[reg] <= 7) {
    964 		FAIL_IF(push_inst16(compiler, STR_SP | ((flags & STORE) ? 0 : 0x800) | RDN3(reg) | (argw >> 2)));
    965 		return -1;
    966 	}
    967 
    968 	if (argw >= 0)
    969 		FAIL_IF(push_inst32(compiler, sljit_mem32[flags] | MEM_IMM12 | RT4(reg) | RN4(arg) | argw));
    970 	else
    971 		FAIL_IF(push_inst32(compiler, sljit_mem32[flags] | MEM_IMM8 | RT4(reg) | RN4(arg) | -argw));
    972 	return -1;
    973 }
    974 
    975 /* see getput_arg below.
    976    Note: can_cache is called only for binary operators. Those
    977    operators always uses word arguments without write back. */
    978 static sljit_si can_cache(sljit_si arg, sljit_sw argw, sljit_si next_arg, sljit_sw next_argw)
    979 {
    980 	sljit_sw diff;
    981 	if ((arg & OFFS_REG_MASK) || !(next_arg & SLJIT_MEM))
    982 		return 0;
    983 
    984 	if (!(arg & REG_MASK)) {
    985 		diff = argw - next_argw;
    986 		if (diff <= 0xfff && diff >= -0xfff)
    987 			return 1;
    988 		return 0;
    989 	}
    990 
    991 	if (argw == next_argw)
    992 		return 1;
    993 
    994 	diff = argw - next_argw;
    995 	if (arg == next_arg && diff <= 0xfff && diff >= -0xfff)
    996 		return 1;
    997 
    998 	return 0;
    999 }
   1000 
   1001 /* Emit the necessary instructions. See can_cache above. */
   1002 static sljit_si getput_arg(struct sljit_compiler *compiler, sljit_si flags, sljit_si reg,
   1003 	sljit_si arg, sljit_sw argw, sljit_si next_arg, sljit_sw next_argw)
   1004 {
   1005 	sljit_si tmp_r, other_r;
   1006 	sljit_sw diff;
   1007 
   1008 	SLJIT_ASSERT(arg & SLJIT_MEM);
   1009 	if (!(next_arg & SLJIT_MEM)) {
   1010 		next_arg = 0;
   1011 		next_argw = 0;
   1012 	}
   1013 
   1014 	tmp_r = (flags & STORE) ? TMP_REG3 : reg;
   1015 
   1016 	if (SLJIT_UNLIKELY((flags & UPDATE) && (arg & REG_MASK))) {
   1017 		/* Update only applies if a base register exists. */
   1018 		/* There is no caching here. */
   1019 		other_r = OFFS_REG(arg);
   1020 		arg &= 0xf;
   1021 		flags &= ~UPDATE;
   1022 
   1023 		if (!other_r) {
   1024 			if (!(argw & ~0xfff)) {
   1025 				FAIL_IF(push_inst32(compiler, sljit_mem32[flags] | MEM_IMM12 | RT4(reg) | RN4(arg) | argw));
   1026 				return push_inst32(compiler, ADDWI | RD4(arg) | RN4(arg) | IMM12(argw));
   1027 			}
   1028 
   1029 			if (compiler->cache_arg == SLJIT_MEM) {
   1030 				if (argw == compiler->cache_argw) {
   1031 					other_r = TMP_REG3;
   1032 					argw = 0;
   1033 				}
   1034 				else if (emit_set_delta(compiler, TMP_REG3, TMP_REG3, argw - compiler->cache_argw) != SLJIT_ERR_UNSUPPORTED) {
   1035 					FAIL_IF(compiler->error);
   1036 					compiler->cache_argw = argw;
   1037 					other_r = TMP_REG3;
   1038 					argw = 0;
   1039 				}
   1040 			}
   1041 
   1042 			if (argw) {
   1043 				FAIL_IF(load_immediate(compiler, TMP_REG3, argw));
   1044 				compiler->cache_arg = SLJIT_MEM;
   1045 				compiler->cache_argw = argw;
   1046 				other_r = TMP_REG3;
   1047 				argw = 0;
   1048 			}
   1049 		}
   1050 
   1051 		argw &= 0x3;
   1052 		if (!argw && IS_3_LO_REGS(reg, arg, other_r)) {
   1053 			FAIL_IF(push_inst16(compiler, sljit_mem16[flags] | RD3(reg) | RN3(arg) | RM3(other_r)));
   1054 			return push_inst16(compiler, ADD | SET_REGS44(arg, other_r));
   1055 		}
   1056 		FAIL_IF(push_inst32(compiler, sljit_mem32[flags] | RT4(reg) | RN4(arg) | RM4(other_r) | (argw << 4)));
   1057 		return push_inst32(compiler, ADD_W | RD4(arg) | RN4(arg) | RM4(other_r) | (argw << 6));
   1058 	}
   1059 	flags &= ~UPDATE;
   1060 
   1061 	SLJIT_ASSERT(!(arg & OFFS_REG_MASK));
   1062 
   1063 	if (compiler->cache_arg == arg) {
   1064 		diff = argw - compiler->cache_argw;
   1065 		if (!(diff & ~0xfff))
   1066 			return push_inst32(compiler, sljit_mem32[flags] | MEM_IMM12 | RT4(reg) | RN4(TMP_REG3) | diff);
   1067 		if (!((compiler->cache_argw - argw) & ~0xff))
   1068 			return push_inst32(compiler, sljit_mem32[flags] | MEM_IMM8 | RT4(reg) | RN4(TMP_REG3) | (compiler->cache_argw - argw));
   1069 		if (emit_set_delta(compiler, TMP_REG3, TMP_REG3, diff) != SLJIT_ERR_UNSUPPORTED) {
   1070 			FAIL_IF(compiler->error);
   1071 			return push_inst32(compiler, sljit_mem32[flags] | MEM_IMM12 | RT4(reg) | RN4(TMP_REG3) | 0);
   1072 		}
   1073 	}
   1074 
   1075 	next_arg = (arg & REG_MASK) && (arg == next_arg) && (argw != next_argw);
   1076 	arg &= 0xf;
   1077 	if (arg && compiler->cache_arg == SLJIT_MEM) {
   1078 		if (compiler->cache_argw == argw)
   1079 			return push_inst32(compiler, sljit_mem32[flags] | RT4(reg) | RN4(arg) | RM4(TMP_REG3));
   1080 		if (emit_set_delta(compiler, TMP_REG3, TMP_REG3, argw - compiler->cache_argw) != SLJIT_ERR_UNSUPPORTED) {
   1081 			FAIL_IF(compiler->error);
   1082 			compiler->cache_argw = argw;
   1083 			return push_inst32(compiler, sljit_mem32[flags] | RT4(reg) | RN4(arg) | RM4(TMP_REG3));
   1084 		}
   1085 	}
   1086 
   1087 	compiler->cache_argw = argw;
   1088 	if (next_arg && emit_set_delta(compiler, TMP_REG3, arg, argw) != SLJIT_ERR_UNSUPPORTED) {
   1089 		FAIL_IF(compiler->error);
   1090 		compiler->cache_arg = SLJIT_MEM | arg;
   1091 		arg = 0;
   1092 	}
   1093 	else {
   1094 		FAIL_IF(load_immediate(compiler, TMP_REG3, argw));
   1095 		compiler->cache_arg = SLJIT_MEM;
   1096 
   1097 		diff = argw - next_argw;
   1098 		if (next_arg && diff <= 0xfff && diff >= -0xfff) {
   1099 			FAIL_IF(push_inst16(compiler, ADD | SET_REGS44(TMP_REG3, arg)));
   1100 			compiler->cache_arg = SLJIT_MEM | arg;
   1101 			arg = 0;
   1102 		}
   1103 	}
   1104 
   1105 	if (arg)
   1106 		return push_inst32(compiler, sljit_mem32[flags] | RT4(reg) | RN4(arg) | RM4(TMP_REG3));
   1107 	return push_inst32(compiler, sljit_mem32[flags] | MEM_IMM12 | RT4(reg) | RN4(TMP_REG3) | 0);
   1108 }
   1109 
   1110 static SLJIT_INLINE sljit_si emit_op_mem(struct sljit_compiler *compiler, sljit_si flags, sljit_si reg, sljit_si arg, sljit_sw argw)
   1111 {
   1112 	if (getput_arg_fast(compiler, flags, reg, arg, argw))
   1113 		return compiler->error;
   1114 	compiler->cache_arg = 0;
   1115 	compiler->cache_argw = 0;
   1116 	return getput_arg(compiler, flags, reg, arg, argw, 0, 0);
   1117 }
   1118 
   1119 static SLJIT_INLINE sljit_si emit_op_mem2(struct sljit_compiler *compiler, sljit_si flags, sljit_si reg, sljit_si arg1, sljit_sw arg1w, sljit_si arg2, sljit_sw arg2w)
   1120 {
   1121 	if (getput_arg_fast(compiler, flags, reg, arg1, arg1w))
   1122 		return compiler->error;
   1123 	return getput_arg(compiler, flags, reg, arg1, arg1w, arg2, arg2w);
   1124 }
   1125 
   1126 /* --------------------------------------------------------------------- */
   1127 /*  Entry, exit                                                          */
   1128 /* --------------------------------------------------------------------- */
   1129 
   1130 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_enter(struct sljit_compiler *compiler,
   1131 	sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
   1132 	sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
   1133 {
   1134 	sljit_si size, i, tmp;
   1135 	sljit_ins push;
   1136 
   1137 	CHECK_ERROR();
   1138 	check_sljit_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);
   1139 
   1140 	compiler->options = options;
   1141 	compiler->scratches = scratches;
   1142 	compiler->saveds = saveds;
   1143 	compiler->fscratches = fscratches;
   1144 	compiler->fsaveds = fsaveds;
   1145 #if (defined SLJIT_DEBUG && SLJIT_DEBUG)
   1146 	compiler->logical_local_size = local_size;
   1147 #endif
   1148 
   1149 	push = (1 << 4);
   1150 
   1151 	tmp = saveds < SLJIT_NUMBER_OF_SAVED_REGISTERS ? (SLJIT_S0 + 1 - saveds) : SLJIT_FIRST_SAVED_REG;
   1152 	for (i = SLJIT_S0; i >= tmp; i--)
   1153 		push |= 1 << reg_map[i];
   1154 
   1155 	for (i = scratches; i >= SLJIT_FIRST_SAVED_REG; i--)
   1156 		push |= 1 << reg_map[i];
   1157 
   1158 	FAIL_IF((push & 0xff00)
   1159 		? push_inst32(compiler, PUSH_W | (1 << 14) | push)
   1160 		: push_inst16(compiler, PUSH | (1 << 8) | push));
   1161 
   1162 	/* Stack must be aligned to 8 bytes: (LR, R4) */
   1163 	size = GET_SAVED_REGISTERS_SIZE(scratches, saveds, 2);
   1164 	local_size = ((size + local_size + 7) & ~7) - size;
   1165 	compiler->local_size = local_size;
   1166 	if (local_size > 0) {
   1167 		if (local_size <= (127 << 2))
   1168 			FAIL_IF(push_inst16(compiler, SUB_SP | (local_size >> 2)));
   1169 		else
   1170 			FAIL_IF(emit_op_imm(compiler, SLJIT_SUB | ARG2_IMM, SLJIT_SP, SLJIT_SP, local_size));
   1171 	}
   1172 
   1173 	if (args >= 1)
   1174 		FAIL_IF(push_inst16(compiler, MOV | SET_REGS44(SLJIT_S0, SLJIT_R0)));
   1175 	if (args >= 2)
   1176 		FAIL_IF(push_inst16(compiler, MOV | SET_REGS44(SLJIT_S1, SLJIT_R1)));
   1177 	if (args >= 3)
   1178 		FAIL_IF(push_inst16(compiler, MOV | SET_REGS44(SLJIT_S2, SLJIT_R2)));
   1179 
   1180 	return SLJIT_SUCCESS;
   1181 }
   1182 
   1183 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_context(struct sljit_compiler *compiler,
   1184 	sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
   1185 	sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
   1186 {
   1187 	sljit_si size;
   1188 
   1189 	CHECK_ERROR_VOID();
   1190 	check_sljit_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);
   1191 
   1192 	compiler->options = options;
   1193 	compiler->scratches = scratches;
   1194 	compiler->saveds = saveds;
   1195 	compiler->fscratches = fscratches;
   1196 	compiler->fsaveds = fsaveds;
   1197 #if (defined SLJIT_DEBUG && SLJIT_DEBUG)
   1198 	compiler->logical_local_size = local_size;
   1199 #endif
   1200 
   1201 	size = GET_SAVED_REGISTERS_SIZE(scratches, saveds, 2);
   1202 	compiler->local_size = ((size + local_size + 7) & ~7) - size;
   1203 }
   1204 
   1205 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_return(struct sljit_compiler *compiler, sljit_si op, sljit_si src, sljit_sw srcw)
   1206 {
   1207 	sljit_si i, tmp;
   1208 	sljit_ins pop;
   1209 
   1210 	CHECK_ERROR();
   1211 	check_sljit_emit_return(compiler, op, src, srcw);
   1212 
   1213 	FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));
   1214 
   1215 	if (compiler->local_size > 0) {
   1216 		if (compiler->local_size <= (127 << 2))
   1217 			FAIL_IF(push_inst16(compiler, ADD_SP | (compiler->local_size >> 2)));
   1218 		else
   1219 			FAIL_IF(emit_op_imm(compiler, SLJIT_ADD | ARG2_IMM, SLJIT_SP, SLJIT_SP, compiler->local_size));
   1220 	}
   1221 
   1222 	pop = (1 << 4);
   1223 
   1224 	tmp = compiler->saveds < SLJIT_NUMBER_OF_SAVED_REGISTERS ? (SLJIT_S0 + 1 - compiler->saveds) : SLJIT_FIRST_SAVED_REG;
   1225 	for (i = SLJIT_S0; i >= tmp; i--)
   1226 		pop |= 1 << reg_map[i];
   1227 
   1228 	for (i = compiler->scratches; i >= SLJIT_FIRST_SAVED_REG; i--)
   1229 		pop |= 1 << reg_map[i];
   1230 
   1231 	return (pop & 0xff00)
   1232 		? push_inst32(compiler, POP_W | (1 << 15) | pop)
   1233 		: push_inst16(compiler, POP | (1 << 8) | pop);
   1234 }
   1235 
   1236 /* --------------------------------------------------------------------- */
   1237 /*  Operators                                                            */
   1238 /* --------------------------------------------------------------------- */
   1239 
   1240 #ifdef __cplusplus
   1241 extern "C" {
   1242 #endif
   1243 
   1244 #if defined(__GNUC__)
   1245 extern unsigned int __aeabi_uidivmod(unsigned int numerator, int unsigned denominator);
   1246 extern int __aeabi_idivmod(int numerator, int denominator);
   1247 #else
   1248 #error "Software divmod functions are needed"
   1249 #endif
   1250 
   1251 #ifdef __cplusplus
   1252 }
   1253 #endif
   1254 
   1255 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op0(struct sljit_compiler *compiler, sljit_si op)
   1256 {
   1257 	CHECK_ERROR();
   1258 	check_sljit_emit_op0(compiler, op);
   1259 
   1260 	op = GET_OPCODE(op);
   1261 	switch (op) {
   1262 	case SLJIT_BREAKPOINT:
   1263 		return push_inst16(compiler, BKPT);
   1264 	case SLJIT_NOP:
   1265 		return push_inst16(compiler, NOP);
   1266 	case SLJIT_UMUL:
   1267 	case SLJIT_SMUL:
   1268 		return push_inst32(compiler, (op == SLJIT_UMUL ? UMULL : SMULL)
   1269 			| (reg_map[SLJIT_R1] << 8)
   1270 			| (reg_map[SLJIT_R0] << 12)
   1271 			| (reg_map[SLJIT_R0] << 16)
   1272 			| reg_map[SLJIT_R1]);
   1273 	case SLJIT_UDIV:
   1274 	case SLJIT_SDIV:
   1275 		if (compiler->scratches >= 4) {
   1276 			FAIL_IF(push_inst32(compiler, 0xf84d2d04 /* str r2, [sp, #-4]! */));
   1277 			FAIL_IF(push_inst32(compiler, 0xf84dcd04 /* str ip, [sp, #-4]! */));
   1278 		} else if (compiler->scratches >= 3)
   1279 			FAIL_IF(push_inst32(compiler, 0xf84d2d08 /* str r2, [sp, #-8]! */));
   1280 #if defined(__GNUC__)
   1281 		FAIL_IF(sljit_emit_ijump(compiler, SLJIT_FAST_CALL, SLJIT_IMM,
   1282 			(op == SLJIT_UDIV ? SLJIT_FUNC_OFFSET(__aeabi_uidivmod) : SLJIT_FUNC_OFFSET(__aeabi_idivmod))));
   1283 #else
   1284 #error "Software divmod functions are needed"
   1285 #endif
   1286 		if (compiler->scratches >= 4) {
   1287 			FAIL_IF(push_inst32(compiler, 0xf85dcb04 /* ldr ip, [sp], #4 */));
   1288 			return push_inst32(compiler, 0xf85d2b04 /* ldr r2, [sp], #4 */);
   1289 		} else if (compiler->scratches >= 3)
   1290 			return push_inst32(compiler, 0xf85d2b08 /* ldr r2, [sp], #8 */);
   1291 		return SLJIT_SUCCESS;
   1292 	}
   1293 
   1294 	return SLJIT_SUCCESS;
   1295 }
   1296 
   1297 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op1(struct sljit_compiler *compiler, sljit_si op,
   1298 	sljit_si dst, sljit_sw dstw,
   1299 	sljit_si src, sljit_sw srcw)
   1300 {
   1301 	sljit_si dst_r, flags;
   1302 	sljit_si op_flags = GET_ALL_FLAGS(op);
   1303 
   1304 	CHECK_ERROR();
   1305 	check_sljit_emit_op1(compiler, op, dst, dstw, src, srcw);
   1306 	ADJUST_LOCAL_OFFSET(dst, dstw);
   1307 	ADJUST_LOCAL_OFFSET(src, srcw);
   1308 
   1309 	compiler->cache_arg = 0;
   1310 	compiler->cache_argw = 0;
   1311 
   1312 	dst_r = SLOW_IS_REG(dst) ? dst : TMP_REG1;
   1313 
   1314 	op = GET_OPCODE(op);
   1315 	if (op >= SLJIT_MOV && op <= SLJIT_MOVU_P) {
   1316 		switch (op) {
   1317 		case SLJIT_MOV:
   1318 		case SLJIT_MOV_UI:
   1319 		case SLJIT_MOV_SI:
   1320 		case SLJIT_MOV_P:
   1321 			flags = WORD_SIZE;
   1322 			break;
   1323 		case SLJIT_MOV_UB:
   1324 			flags = BYTE_SIZE;
   1325 			if (src & SLJIT_IMM)
   1326 				srcw = (sljit_ub)srcw;
   1327 			break;
   1328 		case SLJIT_MOV_SB:
   1329 			flags = BYTE_SIZE | SIGNED;
   1330 			if (src & SLJIT_IMM)
   1331 				srcw = (sljit_sb)srcw;
   1332 			break;
   1333 		case SLJIT_MOV_UH:
   1334 			flags = HALF_SIZE;
   1335 			if (src & SLJIT_IMM)
   1336 				srcw = (sljit_uh)srcw;
   1337 			break;
   1338 		case SLJIT_MOV_SH:
   1339 			flags = HALF_SIZE | SIGNED;
   1340 			if (src & SLJIT_IMM)
   1341 				srcw = (sljit_sh)srcw;
   1342 			break;
   1343 		case SLJIT_MOVU:
   1344 		case SLJIT_MOVU_UI:
   1345 		case SLJIT_MOVU_SI:
   1346 		case SLJIT_MOVU_P:
   1347 			flags = WORD_SIZE | UPDATE;
   1348 			break;
   1349 		case SLJIT_MOVU_UB:
   1350 			flags = BYTE_SIZE | UPDATE;
   1351 			if (src & SLJIT_IMM)
   1352 				srcw = (sljit_ub)srcw;
   1353 			break;
   1354 		case SLJIT_MOVU_SB:
   1355 			flags = BYTE_SIZE | SIGNED | UPDATE;
   1356 			if (src & SLJIT_IMM)
   1357 				srcw = (sljit_sb)srcw;
   1358 			break;
   1359 		case SLJIT_MOVU_UH:
   1360 			flags = HALF_SIZE | UPDATE;
   1361 			if (src & SLJIT_IMM)
   1362 				srcw = (sljit_uh)srcw;
   1363 			break;
   1364 		case SLJIT_MOVU_SH:
   1365 			flags = HALF_SIZE | SIGNED | UPDATE;
   1366 			if (src & SLJIT_IMM)
   1367 				srcw = (sljit_sh)srcw;
   1368 			break;
   1369 		default:
   1370 			SLJIT_ASSERT_STOP();
   1371 			flags = 0;
   1372 			break;
   1373 		}
   1374 
   1375 		if (src & SLJIT_IMM)
   1376 			FAIL_IF(emit_op_imm(compiler, SLJIT_MOV | ARG2_IMM, dst_r, TMP_REG1, srcw));
   1377 		else if (src & SLJIT_MEM) {
   1378 			if (getput_arg_fast(compiler, flags, dst_r, src, srcw))
   1379 				FAIL_IF(compiler->error);
   1380 			else
   1381 				FAIL_IF(getput_arg(compiler, flags, dst_r, src, srcw, dst, dstw));
   1382 		} else {
   1383 			if (dst_r != TMP_REG1)
   1384 				return emit_op_imm(compiler, op, dst_r, TMP_REG1, src);
   1385 			dst_r = src;
   1386 		}
   1387 
   1388 		if (dst & SLJIT_MEM) {
   1389 			if (getput_arg_fast(compiler, flags | STORE, dst_r, dst, dstw))
   1390 				return compiler->error;
   1391 			else
   1392 				return getput_arg(compiler, flags | STORE, dst_r, dst, dstw, 0, 0);
   1393 		}
   1394 		return SLJIT_SUCCESS;
   1395 	}
   1396 
   1397 	if (op == SLJIT_NEG) {
   1398 #if (defined SLJIT_VERBOSE && SLJIT_VERBOSE) || (defined SLJIT_DEBUG && SLJIT_DEBUG)
   1399 		compiler->skip_checks = 1;
   1400 #endif
   1401 		return sljit_emit_op2(compiler, SLJIT_SUB | op_flags, dst, dstw, SLJIT_IMM, 0, src, srcw);
   1402 	}
   1403 
   1404 	flags = (GET_FLAGS(op_flags) ? SET_FLAGS : 0) | ((op_flags & SLJIT_KEEP_FLAGS) ? KEEP_FLAGS : 0);
   1405 	if (src & SLJIT_MEM) {
   1406 		if (getput_arg_fast(compiler, WORD_SIZE, TMP_REG2, src, srcw))
   1407 			FAIL_IF(compiler->error);
   1408 		else
   1409 			FAIL_IF(getput_arg(compiler, WORD_SIZE, TMP_REG2, src, srcw, dst, dstw));
   1410 		src = TMP_REG2;
   1411 	}
   1412 
   1413 	if (src & SLJIT_IMM)
   1414 		flags |= ARG2_IMM;
   1415 	else
   1416 		srcw = src;
   1417 
   1418 	emit_op_imm(compiler, flags | op, dst_r, TMP_REG1, srcw);
   1419 
   1420 	if (dst & SLJIT_MEM) {
   1421 		if (getput_arg_fast(compiler, flags | STORE, dst_r, dst, dstw))
   1422 			return compiler->error;
   1423 		else
   1424 			return getput_arg(compiler, flags | STORE, dst_r, dst, dstw, 0, 0);
   1425 	}
   1426 	return SLJIT_SUCCESS;
   1427 }
   1428 
   1429 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op2(struct sljit_compiler *compiler, sljit_si op,
   1430 	sljit_si dst, sljit_sw dstw,
   1431 	sljit_si src1, sljit_sw src1w,
   1432 	sljit_si src2, sljit_sw src2w)
   1433 {
   1434 	sljit_si dst_r, flags;
   1435 
   1436 	CHECK_ERROR();
   1437 	check_sljit_emit_op2(compiler, op, dst, dstw, src1, src1w, src2, src2w);
   1438 	ADJUST_LOCAL_OFFSET(dst, dstw);
   1439 	ADJUST_LOCAL_OFFSET(src1, src1w);
   1440 	ADJUST_LOCAL_OFFSET(src2, src2w);
   1441 
   1442 	compiler->cache_arg = 0;
   1443 	compiler->cache_argw = 0;
   1444 
   1445 	dst_r = SLOW_IS_REG(dst) ? dst : TMP_REG1;
   1446 	flags = (GET_FLAGS(op) ? SET_FLAGS : 0) | ((op & SLJIT_KEEP_FLAGS) ? KEEP_FLAGS : 0);
   1447 
   1448 	if ((dst & SLJIT_MEM) && !getput_arg_fast(compiler, WORD_SIZE | STORE | ARG_TEST, TMP_REG1, dst, dstw))
   1449 		flags |= SLOW_DEST;
   1450 
   1451 	if (src1 & SLJIT_MEM) {
   1452 		if (getput_arg_fast(compiler, WORD_SIZE, TMP_REG1, src1, src1w))
   1453 			FAIL_IF(compiler->error);
   1454 		else
   1455 			flags |= SLOW_SRC1;
   1456 	}
   1457 	if (src2 & SLJIT_MEM) {
   1458 		if (getput_arg_fast(compiler, WORD_SIZE, TMP_REG2, src2, src2w))
   1459 			FAIL_IF(compiler->error);
   1460 		else
   1461 			flags |= SLOW_SRC2;
   1462 	}
   1463 
   1464 	if ((flags & (SLOW_SRC1 | SLOW_SRC2)) == (SLOW_SRC1 | SLOW_SRC2)) {
   1465 		if (!can_cache(src1, src1w, src2, src2w) && can_cache(src1, src1w, dst, dstw)) {
   1466 			FAIL_IF(getput_arg(compiler, WORD_SIZE, TMP_REG2, src2, src2w, src1, src1w));
   1467 			FAIL_IF(getput_arg(compiler, WORD_SIZE, TMP_REG1, src1, src1w, dst, dstw));
   1468 		}
   1469 		else {
   1470 			FAIL_IF(getput_arg(compiler, WORD_SIZE, TMP_REG1, src1, src1w, src2, src2w));
   1471 			FAIL_IF(getput_arg(compiler, WORD_SIZE, TMP_REG2, src2, src2w, dst, dstw));
   1472 		}
   1473 	}
   1474 	else if (flags & SLOW_SRC1)
   1475 		FAIL_IF(getput_arg(compiler, WORD_SIZE, TMP_REG1, src1, src1w, dst, dstw));
   1476 	else if (flags & SLOW_SRC2)
   1477 		FAIL_IF(getput_arg(compiler, WORD_SIZE, TMP_REG2, src2, src2w, dst, dstw));
   1478 
   1479 	if (src1 & SLJIT_MEM)
   1480 		src1 = TMP_REG1;
   1481 	if (src2 & SLJIT_MEM)
   1482 		src2 = TMP_REG2;
   1483 
   1484 	if (src1 & SLJIT_IMM)
   1485 		flags |= ARG1_IMM;
   1486 	else
   1487 		src1w = src1;
   1488 	if (src2 & SLJIT_IMM)
   1489 		flags |= ARG2_IMM;
   1490 	else
   1491 		src2w = src2;
   1492 
   1493 	if (dst == SLJIT_UNUSED)
   1494 		flags |= UNUSED_RETURN;
   1495 
   1496 	emit_op_imm(compiler, flags | GET_OPCODE(op), dst_r, src1w, src2w);
   1497 
   1498 	if (dst & SLJIT_MEM) {
   1499 		if (!(flags & SLOW_DEST)) {
   1500 			getput_arg_fast(compiler, WORD_SIZE | STORE, dst_r, dst, dstw);
   1501 			return compiler->error;
   1502 		}
   1503 		return getput_arg(compiler, WORD_SIZE | STORE, TMP_REG1, dst, dstw, 0, 0);
   1504 	}
   1505 	return SLJIT_SUCCESS;
   1506 }
   1507 
   1508 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_get_register_index(sljit_si reg)
   1509 {
   1510 	check_sljit_get_register_index(reg);
   1511 	return reg_map[reg];
   1512 }
   1513 
   1514 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_get_float_register_index(sljit_si reg)
   1515 {
   1516 	check_sljit_get_float_register_index(reg);
   1517 	return reg << 1;
   1518 }
   1519 
   1520 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op_custom(struct sljit_compiler *compiler,
   1521 	void *instruction, sljit_si size)
   1522 {
   1523 	CHECK_ERROR();
   1524 	check_sljit_emit_op_custom(compiler, instruction, size);
   1525 	SLJIT_ASSERT(size == 2 || size == 4);
   1526 
   1527 	if (size == 2)
   1528 		return push_inst16(compiler, *(sljit_uh*)instruction);
   1529 	return push_inst32(compiler, *(sljit_ins*)instruction);
   1530 }
   1531 
   1532 /* --------------------------------------------------------------------- */
   1533 /*  Floating point operators                                             */
   1534 /* --------------------------------------------------------------------- */
   1535 
   1536 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_is_fpu_available(void)
   1537 {
   1538 #ifdef SLJIT_IS_FPU_AVAILABLE
   1539 	return SLJIT_IS_FPU_AVAILABLE;
   1540 #else
   1541 	/* Available by default. */
   1542 	return 1;
   1543 #endif
   1544 }
   1545 
   1546 #define FPU_LOAD (1 << 20)
   1547 
   1548 static sljit_si emit_fop_mem(struct sljit_compiler *compiler, sljit_si flags, sljit_si reg, sljit_si arg, sljit_sw argw)
   1549 {
   1550 	sljit_sw tmp;
   1551 	sljit_uw imm;
   1552 	sljit_sw inst = VSTR_F32 | (flags & (SLJIT_SINGLE_OP | FPU_LOAD));
   1553 
   1554 	SLJIT_ASSERT(arg & SLJIT_MEM);
   1555 
   1556 	/* Fast loads and stores. */
   1557 	if (SLJIT_UNLIKELY(arg & OFFS_REG_MASK)) {
   1558 		FAIL_IF(push_inst32(compiler, ADD_W | RD4(TMP_REG2) | RN4(arg & REG_MASK) | RM4(OFFS_REG(arg)) | ((argw & 0x3) << 6)));
   1559 		arg = SLJIT_MEM | TMP_REG2;
   1560 		argw = 0;
   1561 	}
   1562 
   1563 	if ((arg & REG_MASK) && (argw & 0x3) == 0) {
   1564 		if (!(argw & ~0x3fc))
   1565 			return push_inst32(compiler, inst | 0x800000 | RN4(arg & REG_MASK) | DD4(reg) | (argw >> 2));
   1566 		if (!(-argw & ~0x3fc))
   1567 			return push_inst32(compiler, inst | RN4(arg & REG_MASK) | DD4(reg) | (-argw >> 2));
   1568 	}
   1569 
   1570 	/* Slow cases */
   1571 	SLJIT_ASSERT(!(arg & OFFS_REG_MASK));
   1572 	if (compiler->cache_arg == arg) {
   1573 		tmp = argw - compiler->cache_argw;
   1574 		if (!(tmp & ~0x3fc))
   1575 			return push_inst32(compiler, inst | 0x800000 | RN4(TMP_REG3) | DD4(reg) | (tmp >> 2));
   1576 		if (!(-tmp & ~0x3fc))
   1577 			return push_inst32(compiler, inst | RN4(TMP_REG3) | DD4(reg) | (-tmp >> 2));
   1578 		if (emit_set_delta(compiler, TMP_REG3, TMP_REG3, tmp) != SLJIT_ERR_UNSUPPORTED) {
   1579 			FAIL_IF(compiler->error);
   1580 			compiler->cache_argw = argw;
   1581 			return push_inst32(compiler, inst | 0x800000 | RN4(TMP_REG3) | DD4(reg));
   1582 		}
   1583 	}
   1584 
   1585 	if (arg & REG_MASK) {
   1586 		if (emit_set_delta(compiler, TMP_REG1, arg & REG_MASK, argw) != SLJIT_ERR_UNSUPPORTED) {
   1587 			FAIL_IF(compiler->error);
   1588 			return push_inst32(compiler, inst | 0x800000 | RN4(TMP_REG1) | DD4(reg));
   1589 		}
   1590 		imm = get_imm(argw & ~0x3fc);
   1591 		if (imm != INVALID_IMM) {
   1592 			FAIL_IF(push_inst32(compiler, ADD_WI | RD4(TMP_REG1) | RN4(arg & REG_MASK) | imm));
   1593 			return push_inst32(compiler, inst | 0x800000 | RN4(TMP_REG1) | DD4(reg) | ((argw & 0x3fc) >> 2));
   1594 		}
   1595 		imm = get_imm(-argw & ~0x3fc);
   1596 		if (imm != INVALID_IMM) {
   1597 			argw = -argw;
   1598 			FAIL_IF(push_inst32(compiler, SUB_WI | RD4(TMP_REG1) | RN4(arg & REG_MASK) | imm));
   1599 			return push_inst32(compiler, inst | RN4(TMP_REG1) | DD4(reg) | ((argw & 0x3fc) >> 2));
   1600 		}
   1601 	}
   1602 
   1603 	compiler->cache_arg = arg;
   1604 	compiler->cache_argw = argw;
   1605 
   1606 	FAIL_IF(load_immediate(compiler, TMP_REG3, argw));
   1607 	if (arg & REG_MASK)
   1608 		FAIL_IF(push_inst16(compiler, ADD | SET_REGS44(TMP_REG3, (arg & REG_MASK))));
   1609 	return push_inst32(compiler, inst | 0x800000 | RN4(TMP_REG3) | DD4(reg));
   1610 }
   1611 
   1612 static SLJIT_INLINE sljit_si sljit_emit_fop1_convw_fromd(struct sljit_compiler *compiler, sljit_si op,
   1613 	sljit_si dst, sljit_sw dstw,
   1614 	sljit_si src, sljit_sw srcw)
   1615 {
   1616 	if (src & SLJIT_MEM) {
   1617 		FAIL_IF(emit_fop_mem(compiler, (op & SLJIT_SINGLE_OP) | FPU_LOAD, TMP_FREG1, src, srcw));
   1618 		src = TMP_FREG1;
   1619 	}
   1620 
   1621 	FAIL_IF(push_inst32(compiler, VCVT_S32_F32 | (op & SLJIT_SINGLE_OP) | DD4(TMP_FREG1) | DM4(src)));
   1622 
   1623 	if (dst == SLJIT_UNUSED)
   1624 		return SLJIT_SUCCESS;
   1625 
   1626 	if (FAST_IS_REG(dst))
   1627 		return push_inst32(compiler, VMOV | (1 << 20) | RT4(dst) | DN4(TMP_FREG1));
   1628 
   1629 	/* Store the integer value from a VFP register. */
   1630 	return emit_fop_mem(compiler, 0, TMP_FREG1, dst, dstw);
   1631 }
   1632 
   1633 static SLJIT_INLINE sljit_si sljit_emit_fop1_convd_fromw(struct sljit_compiler *compiler, sljit_si op,
   1634 	sljit_si dst, sljit_sw dstw,
   1635 	sljit_si src, sljit_sw srcw)
   1636 {
   1637 	sljit_si dst_r = FAST_IS_REG(dst) ? dst : TMP_FREG1;
   1638 
   1639 	if (FAST_IS_REG(src))
   1640 		FAIL_IF(push_inst32(compiler, VMOV | RT4(src) | DN4(TMP_FREG1)));
   1641 	else if (src & SLJIT_MEM) {
   1642 		/* Load the integer value into a VFP register. */
   1643 		FAIL_IF(emit_fop_mem(compiler, FPU_LOAD, TMP_FREG1, src, srcw));
   1644 	}
   1645 	else {
   1646 		FAIL_IF(load_immediate(compiler, TMP_REG1, srcw));
   1647 		FAIL_IF(push_inst32(compiler, VMOV | RT4(TMP_REG1) | DN4(TMP_FREG1)));
   1648 	}
   1649 
   1650 	FAIL_IF(push_inst32(compiler, VCVT_F32_S32 | (op & SLJIT_SINGLE_OP) | DD4(dst_r) | DM4(TMP_FREG1)));
   1651 
   1652 	if (dst & SLJIT_MEM)
   1653 		return emit_fop_mem(compiler, (op & SLJIT_SINGLE_OP), TMP_FREG1, dst, dstw);
   1654 	return SLJIT_SUCCESS;
   1655 }
   1656 
   1657 static SLJIT_INLINE sljit_si sljit_emit_fop1_cmp(struct sljit_compiler *compiler, sljit_si op,
   1658 	sljit_si src1, sljit_sw src1w,
   1659 	sljit_si src2, sljit_sw src2w)
   1660 {
   1661 	if (src1 & SLJIT_MEM) {
   1662 		emit_fop_mem(compiler, (op & SLJIT_SINGLE_OP) | FPU_LOAD, TMP_FREG1, src1, src1w);
   1663 		src1 = TMP_FREG1;
   1664 	}
   1665 
   1666 	if (src2 & SLJIT_MEM) {
   1667 		emit_fop_mem(compiler, (op & SLJIT_SINGLE_OP) | FPU_LOAD, TMP_FREG2, src2, src2w);
   1668 		src2 = TMP_FREG2;
   1669 	}
   1670 
   1671 	FAIL_IF(push_inst32(compiler, VCMP_F32 | (op & SLJIT_SINGLE_OP) | DD4(src1) | DM4(src2)));
   1672 	return push_inst32(compiler, VMRS);
   1673 }
   1674 
   1675 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fop1(struct sljit_compiler *compiler, sljit_si op,
   1676 	sljit_si dst, sljit_sw dstw,
   1677 	sljit_si src, sljit_sw srcw)
   1678 {
   1679 	sljit_si dst_r;
   1680 
   1681 	CHECK_ERROR();
   1682 	compiler->cache_arg = 0;
   1683 	compiler->cache_argw = 0;
   1684 	if (GET_OPCODE(op) != SLJIT_CONVD_FROMS)
   1685 		op ^= SLJIT_SINGLE_OP;
   1686 
   1687 	SLJIT_COMPILE_ASSERT((SLJIT_SINGLE_OP == 0x100), float_transfer_bit_error);
   1688 	SELECT_FOP1_OPERATION_WITH_CHECKS(compiler, op, dst, dstw, src, srcw);
   1689 
   1690 	dst_r = FAST_IS_REG(dst) ? dst : TMP_FREG1;
   1691 
   1692 	if (src & SLJIT_MEM) {
   1693 		emit_fop_mem(compiler, (op & SLJIT_SINGLE_OP) | FPU_LOAD, dst_r, src, srcw);
   1694 		src = dst_r;
   1695 	}
   1696 
   1697 	switch (GET_OPCODE(op)) {
   1698 	case SLJIT_MOVD:
   1699 		if (src != dst_r) {
   1700 			if (dst_r != TMP_FREG1)
   1701 				FAIL_IF(push_inst32(compiler, VMOV_F32 | (op & SLJIT_SINGLE_OP) | DD4(dst_r) | DM4(src)));
   1702 			else
   1703 				dst_r = src;
   1704 		}
   1705 		break;
   1706 	case SLJIT_NEGD:
   1707 		FAIL_IF(push_inst32(compiler, VNEG_F32 | (op & SLJIT_SINGLE_OP) | DD4(dst_r) | DM4(src)));
   1708 		break;
   1709 	case SLJIT_ABSD:
   1710 		FAIL_IF(push_inst32(compiler, VABS_F32 | (op & SLJIT_SINGLE_OP) | DD4(dst_r) | DM4(src)));
   1711 		break;
   1712 	case SLJIT_CONVD_FROMS:
   1713 		FAIL_IF(push_inst32(compiler, VCVT_F64_F32 | (op & SLJIT_SINGLE_OP) | DD4(dst_r) | DM4(src)));
   1714 		op ^= SLJIT_SINGLE_OP;
   1715 		break;
   1716 	}
   1717 
   1718 	if (dst & SLJIT_MEM)
   1719 		return emit_fop_mem(compiler, (op & SLJIT_SINGLE_OP), dst_r, dst, dstw);
   1720 	return SLJIT_SUCCESS;
   1721 }
   1722 
   1723 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fop2(struct sljit_compiler *compiler, sljit_si op,
   1724 	sljit_si dst, sljit_sw dstw,
   1725 	sljit_si src1, sljit_sw src1w,
   1726 	sljit_si src2, sljit_sw src2w)
   1727 {
   1728 	sljit_si dst_r;
   1729 
   1730 	CHECK_ERROR();
   1731 	check_sljit_emit_fop2(compiler, op, dst, dstw, src1, src1w, src2, src2w);
   1732 	ADJUST_LOCAL_OFFSET(dst, dstw);
   1733 	ADJUST_LOCAL_OFFSET(src1, src1w);
   1734 	ADJUST_LOCAL_OFFSET(src2, src2w);
   1735 
   1736 	compiler->cache_arg = 0;
   1737 	compiler->cache_argw = 0;
   1738 	op ^= SLJIT_SINGLE_OP;
   1739 
   1740 	dst_r = FAST_IS_REG(dst) ? dst : TMP_FREG1;
   1741 	if (src1 & SLJIT_MEM) {
   1742 		emit_fop_mem(compiler, (op & SLJIT_SINGLE_OP) | FPU_LOAD, TMP_FREG1, src1, src1w);
   1743 		src1 = TMP_FREG1;
   1744 	}
   1745 	if (src2 & SLJIT_MEM) {
   1746 		emit_fop_mem(compiler, (op & SLJIT_SINGLE_OP) | FPU_LOAD, TMP_FREG2, src2, src2w);
   1747 		src2 = TMP_FREG2;
   1748 	}
   1749 
   1750 	switch (GET_OPCODE(op)) {
   1751 	case SLJIT_ADDD:
   1752 		FAIL_IF(push_inst32(compiler, VADD_F32 | (op & SLJIT_SINGLE_OP) | DD4(dst_r) | DN4(src1) | DM4(src2)));
   1753 		break;
   1754 	case SLJIT_SUBD:
   1755 		FAIL_IF(push_inst32(compiler, VSUB_F32 | (op & SLJIT_SINGLE_OP) | DD4(dst_r) | DN4(src1) | DM4(src2)));
   1756 		break;
   1757 	case SLJIT_MULD:
   1758 		FAIL_IF(push_inst32(compiler, VMUL_F32 | (op & SLJIT_SINGLE_OP) | DD4(dst_r) | DN4(src1) | DM4(src2)));
   1759 		break;
   1760 	case SLJIT_DIVD:
   1761 		FAIL_IF(push_inst32(compiler, VDIV_F32 | (op & SLJIT_SINGLE_OP) | DD4(dst_r) | DN4(src1) | DM4(src2)));
   1762 		break;
   1763 	}
   1764 
   1765 	if (!(dst & SLJIT_MEM))
   1766 		return SLJIT_SUCCESS;
   1767 	return emit_fop_mem(compiler, (op & SLJIT_SINGLE_OP), TMP_FREG1, dst, dstw);
   1768 }
   1769 
   1770 #undef FPU_LOAD
   1771 
   1772 /* --------------------------------------------------------------------- */
   1773 /*  Other instructions                                                   */
   1774 /* --------------------------------------------------------------------- */
   1775 
   1776 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw)
   1777 {
   1778 	CHECK_ERROR();
   1779 	check_sljit_emit_fast_enter(compiler, dst, dstw);
   1780 	ADJUST_LOCAL_OFFSET(dst, dstw);
   1781 
   1782 	/* For UNUSED dst. Uncommon, but possible. */
   1783 	if (dst == SLJIT_UNUSED)
   1784 		return SLJIT_SUCCESS;
   1785 
   1786 	if (FAST_IS_REG(dst))
   1787 		return push_inst16(compiler, MOV | SET_REGS44(dst, TMP_REG3));
   1788 
   1789 	/* Memory. */
   1790 	if (getput_arg_fast(compiler, WORD_SIZE | STORE, TMP_REG3, dst, dstw))
   1791 		return compiler->error;
   1792 	/* TMP_REG3 is used for caching. */
   1793 	FAIL_IF(push_inst16(compiler, MOV | SET_REGS44(TMP_REG2, TMP_REG3)));
   1794 	compiler->cache_arg = 0;
   1795 	compiler->cache_argw = 0;
   1796 	return getput_arg(compiler, WORD_SIZE | STORE, TMP_REG2, dst, dstw, 0, 0);
   1797 }
   1798 
   1799 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_si src, sljit_sw srcw)
   1800 {
   1801 	CHECK_ERROR();
   1802 	check_sljit_emit_fast_return(compiler, src, srcw);
   1803 	ADJUST_LOCAL_OFFSET(src, srcw);
   1804 
   1805 	if (FAST_IS_REG(src))
   1806 		FAIL_IF(push_inst16(compiler, MOV | SET_REGS44(TMP_REG3, src)));
   1807 	else if (src & SLJIT_MEM) {
   1808 		if (getput_arg_fast(compiler, WORD_SIZE, TMP_REG3, src, srcw))
   1809 			FAIL_IF(compiler->error);
   1810 		else {
   1811 			compiler->cache_arg = 0;
   1812 			compiler->cache_argw = 0;
   1813 			FAIL_IF(getput_arg(compiler, WORD_SIZE, TMP_REG2, src, srcw, 0, 0));
   1814 			FAIL_IF(push_inst16(compiler, MOV | SET_REGS44(TMP_REG3, TMP_REG2)));
   1815 		}
   1816 	}
   1817 	else if (src & SLJIT_IMM)
   1818 		FAIL_IF(load_immediate(compiler, TMP_REG3, srcw));
   1819 	return push_inst16(compiler, BLX | RN3(TMP_REG3));
   1820 }
   1821 
   1822 /* --------------------------------------------------------------------- */
   1823 /*  Conditional instructions                                             */
   1824 /* --------------------------------------------------------------------- */
   1825 
   1826 static sljit_uw get_cc(sljit_si type)
   1827 {
   1828 	switch (type) {
   1829 	case SLJIT_C_EQUAL:
   1830 	case SLJIT_C_MUL_NOT_OVERFLOW:
   1831 	case SLJIT_C_FLOAT_EQUAL:
   1832 		return 0x0;
   1833 
   1834 	case SLJIT_C_NOT_EQUAL:
   1835 	case SLJIT_C_MUL_OVERFLOW:
   1836 	case SLJIT_C_FLOAT_NOT_EQUAL:
   1837 		return 0x1;
   1838 
   1839 	case SLJIT_C_LESS:
   1840 	case SLJIT_C_FLOAT_LESS:
   1841 		return 0x3;
   1842 
   1843 	case SLJIT_C_GREATER_EQUAL:
   1844 	case SLJIT_C_FLOAT_GREATER_EQUAL:
   1845 		return 0x2;
   1846 
   1847 	case SLJIT_C_GREATER:
   1848 	case SLJIT_C_FLOAT_GREATER:
   1849 		return 0x8;
   1850 
   1851 	case SLJIT_C_LESS_EQUAL:
   1852 	case SLJIT_C_FLOAT_LESS_EQUAL:
   1853 		return 0x9;
   1854 
   1855 	case SLJIT_C_SIG_LESS:
   1856 		return 0xb;
   1857 
   1858 	case SLJIT_C_SIG_GREATER_EQUAL:
   1859 		return 0xa;
   1860 
   1861 	case SLJIT_C_SIG_GREATER:
   1862 		return 0xc;
   1863 
   1864 	case SLJIT_C_SIG_LESS_EQUAL:
   1865 		return 0xd;
   1866 
   1867 	case SLJIT_C_OVERFLOW:
   1868 	case SLJIT_C_FLOAT_UNORDERED:
   1869 		return 0x6;
   1870 
   1871 	case SLJIT_C_NOT_OVERFLOW:
   1872 	case SLJIT_C_FLOAT_ORDERED:
   1873 		return 0x7;
   1874 
   1875 	default: /* SLJIT_JUMP */
   1876 		return 0xe;
   1877 	}
   1878 }
   1879 
   1880 SLJIT_API_FUNC_ATTRIBUTE struct sljit_label* sljit_emit_label(struct sljit_compiler *compiler)
   1881 {
   1882 	struct sljit_label *label;
   1883 
   1884 	CHECK_ERROR_PTR();
   1885 	check_sljit_emit_label(compiler);
   1886 
   1887 	if (compiler->last_label && compiler->last_label->size == compiler->size)
   1888 		return compiler->last_label;
   1889 
   1890 	label = (struct sljit_label*)ensure_abuf(compiler, sizeof(struct sljit_label));
   1891 	PTR_FAIL_IF(!label);
   1892 	set_label(label, compiler);
   1893 	return label;
   1894 }
   1895 
   1896 SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_jump(struct sljit_compiler *compiler, sljit_si type)
   1897 {
   1898 	struct sljit_jump *jump;
   1899 	sljit_ins cc;
   1900 
   1901 	CHECK_ERROR_PTR();
   1902 	check_sljit_emit_jump(compiler, type);
   1903 
   1904 	jump = (struct sljit_jump*)ensure_abuf(compiler, sizeof(struct sljit_jump));
   1905 	PTR_FAIL_IF(!jump);
   1906 	set_jump(jump, compiler, type & SLJIT_REWRITABLE_JUMP);
   1907 	type &= 0xff;
   1908 
   1909 	/* In ARM, we don't need to touch the arguments. */
   1910 	PTR_FAIL_IF(emit_imm32_const(compiler, TMP_REG1, 0));
   1911 	if (type < SLJIT_JUMP) {
   1912 		jump->flags |= IS_COND;
   1913 		cc = get_cc(type);
   1914 		jump->flags |= cc << 8;
   1915 		PTR_FAIL_IF(push_inst16(compiler, IT | (cc << 4) | 0x8));
   1916 	}
   1917 
   1918 	jump->addr = compiler->size;
   1919 	if (type <= SLJIT_JUMP)
   1920 		PTR_FAIL_IF(push_inst16(compiler, BX | RN3(TMP_REG1)));
   1921 	else {
   1922 		jump->flags |= IS_BL;
   1923 		PTR_FAIL_IF(push_inst16(compiler, BLX | RN3(TMP_REG1)));
   1924 	}
   1925 
   1926 	return jump;
   1927 }
   1928 
   1929 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_ijump(struct sljit_compiler *compiler, sljit_si type, sljit_si src, sljit_sw srcw)
   1930 {
   1931 	struct sljit_jump *jump;
   1932 
   1933 	CHECK_ERROR();
   1934 	check_sljit_emit_ijump(compiler, type, src, srcw);
   1935 	ADJUST_LOCAL_OFFSET(src, srcw);
   1936 
   1937 	/* In ARM, we don't need to touch the arguments. */
   1938 	if (!(src & SLJIT_IMM)) {
   1939 		if (FAST_IS_REG(src))
   1940 			return push_inst16(compiler, (type <= SLJIT_JUMP ? BX : BLX) | RN3(src));
   1941 
   1942 		FAIL_IF(emit_op_mem(compiler, WORD_SIZE, type <= SLJIT_JUMP ? TMP_PC : TMP_REG1, src, srcw));
   1943 		if (type >= SLJIT_FAST_CALL)
   1944 			return push_inst16(compiler, BLX | RN3(TMP_REG1));
   1945 	}
   1946 
   1947 	jump = (struct sljit_jump*)ensure_abuf(compiler, sizeof(struct sljit_jump));
   1948 	FAIL_IF(!jump);
   1949 	set_jump(jump, compiler, JUMP_ADDR | ((type >= SLJIT_FAST_CALL) ? IS_BL : 0));
   1950 	jump->u.target = srcw;
   1951 
   1952 	FAIL_IF(emit_imm32_const(compiler, TMP_REG1, 0));
   1953 	jump->addr = compiler->size;
   1954 	return push_inst16(compiler, (type <= SLJIT_JUMP ? BX : BLX) | RN3(TMP_REG1));
   1955 }
   1956 
   1957 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_op_flags(struct sljit_compiler *compiler, sljit_si op,
   1958 	sljit_si dst, sljit_sw dstw,
   1959 	sljit_si src, sljit_sw srcw,
   1960 	sljit_si type)
   1961 {
   1962 	sljit_si dst_r, flags = GET_ALL_FLAGS(op);
   1963 	sljit_ins cc, ins;
   1964 
   1965 	CHECK_ERROR();
   1966 	check_sljit_emit_op_flags(compiler, op, dst, dstw, src, srcw, type);
   1967 	ADJUST_LOCAL_OFFSET(dst, dstw);
   1968 	ADJUST_LOCAL_OFFSET(src, srcw);
   1969 
   1970 	if (dst == SLJIT_UNUSED)
   1971 		return SLJIT_SUCCESS;
   1972 
   1973 	op = GET_OPCODE(op);
   1974 	cc = get_cc(type);
   1975 	dst_r = FAST_IS_REG(dst) ? dst : TMP_REG2;
   1976 
   1977 	if (op < SLJIT_ADD) {
   1978 		FAIL_IF(push_inst16(compiler, IT | (cc << 4) | (((cc & 0x1) ^ 0x1) << 3) | 0x4));
   1979 		if (reg_map[dst_r] > 7) {
   1980 			FAIL_IF(push_inst32(compiler, MOV_WI | RD4(dst_r) | 1));
   1981 			FAIL_IF(push_inst32(compiler, MOV_WI | RD4(dst_r) | 0));
   1982 		} else {
   1983 			FAIL_IF(push_inst16(compiler, MOVSI | RDN3(dst_r) | 1));
   1984 			FAIL_IF(push_inst16(compiler, MOVSI | RDN3(dst_r) | 0));
   1985 		}
   1986 		if (dst_r != TMP_REG2)
   1987 			return SLJIT_SUCCESS;
   1988 		return emit_op_mem(compiler, WORD_SIZE | STORE, TMP_REG2, dst, dstw);
   1989 	}
   1990 
   1991 	ins = (op == SLJIT_AND ? ANDI : (op == SLJIT_OR ? ORRI : EORI));
   1992 	if ((op == SLJIT_OR || op == SLJIT_XOR) && FAST_IS_REG(dst) && dst == src) {
   1993 		/* Does not change the other bits. */
   1994 		FAIL_IF(push_inst16(compiler, IT | (cc << 4) | 0x8));
   1995 		FAIL_IF(push_inst32(compiler, ins | RN4(src) | RD4(dst) | 1));
   1996 		if (flags & SLJIT_SET_E) {
   1997 			/* The condition must always be set, even if the ORRI/EORI is not executed above. */
   1998 			if (reg_map[dst] <= 7)
   1999 				return push_inst16(compiler, MOVS | RD3(TMP_REG1) | RN3(dst));
   2000 			return push_inst32(compiler, MOV_W | SET_FLAGS | RD4(TMP_REG1) | RM4(dst));
   2001 		}
   2002 		return SLJIT_SUCCESS;
   2003 	}
   2004 
   2005 	compiler->cache_arg = 0;
   2006 	compiler->cache_argw = 0;
   2007 	if (src & SLJIT_MEM) {
   2008 		FAIL_IF(emit_op_mem2(compiler, WORD_SIZE, TMP_REG2, src, srcw, dst, dstw));
   2009 		src = TMP_REG2;
   2010 		srcw = 0;
   2011 	} else if (src & SLJIT_IMM) {
   2012 		FAIL_IF(load_immediate(compiler, TMP_REG2, srcw));
   2013 		src = TMP_REG2;
   2014 		srcw = 0;
   2015 	}
   2016 
   2017 	if (op == SLJIT_AND || src != dst_r) {
   2018 		FAIL_IF(push_inst16(compiler, IT | (cc << 4) | (((cc & 0x1) ^ 0x1) << 3) | 0x4));
   2019 		FAIL_IF(push_inst32(compiler, ins | RN4(src) | RD4(dst_r) | 1));
   2020 		FAIL_IF(push_inst32(compiler, ins | RN4(src) | RD4(dst_r) | 0));
   2021 	}
   2022 	else {
   2023 		FAIL_IF(push_inst16(compiler, IT | (cc << 4) | 0x8));
   2024 		FAIL_IF(push_inst32(compiler, ins | RN4(src) | RD4(dst_r) | 1));
   2025 	}
   2026 
   2027 	if (dst_r == TMP_REG2)
   2028 		FAIL_IF(emit_op_mem2(compiler, WORD_SIZE | STORE, TMP_REG2, dst, dstw, 0, 0));
   2029 
   2030 	if (flags & SLJIT_SET_E) {
   2031 		/* The condition must always be set, even if the ORR/EORI is not executed above. */
   2032 		if (reg_map[dst_r] <= 7)
   2033 			return push_inst16(compiler, MOVS | RD3(TMP_REG1) | RN3(dst_r));
   2034 		return push_inst32(compiler, MOV_W | SET_FLAGS | RD4(TMP_REG1) | RM4(dst_r));
   2035 	}
   2036 	return SLJIT_SUCCESS;
   2037 }
   2038 
   2039 SLJIT_API_FUNC_ATTRIBUTE struct sljit_const* sljit_emit_const(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw, sljit_sw init_value)
   2040 {
   2041 	struct sljit_const *const_;
   2042 	sljit_si dst_r;
   2043 
   2044 	CHECK_ERROR_PTR();
   2045 	check_sljit_emit_const(compiler, dst, dstw, init_value);
   2046 	ADJUST_LOCAL_OFFSET(dst, dstw);
   2047 
   2048 	const_ = (struct sljit_const*)ensure_abuf(compiler, sizeof(struct sljit_const));
   2049 	PTR_FAIL_IF(!const_);
   2050 	set_const(const_, compiler);
   2051 
   2052 	dst_r = SLOW_IS_REG(dst) ? dst : TMP_REG1;
   2053 	PTR_FAIL_IF(emit_imm32_const(compiler, dst_r, init_value));
   2054 
   2055 	if (dst & SLJIT_MEM)
   2056 		PTR_FAIL_IF(emit_op_mem(compiler, WORD_SIZE | STORE, dst_r, dst, dstw));
   2057 	return const_;
   2058 }
   2059 
   2060 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_addr)
   2061 {
   2062 	sljit_uh *inst = (sljit_uh*)addr;
   2063 	modify_imm32_const(inst, new_addr);
   2064 	SLJIT_CACHE_FLUSH(inst, inst + 4);
   2065 }
   2066 
   2067 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant)
   2068 {
   2069 	sljit_uh *inst = (sljit_uh*)addr;
   2070 	modify_imm32_const(inst, new_constant);
   2071 	SLJIT_CACHE_FLUSH(inst, inst + 4);
   2072 }
   2073