1 /*
2  *    Stack-less Just-In-Time compiler
3  *
4  *    Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without modification, are
7  * permitted provided that the following conditions are met:
8  *
9  *   1. Redistributions of source code must retain the above copyright notice, this list of
10  *      conditions and the following disclaimer.
11  *
12  *   2. Redistributions in binary form must reproduce the above copyright notice, this list
13  *      of conditions and the following disclaimer in the documentation and/or other materials
14  *      provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19  * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
21  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
22  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 /* mips 64-bit arch dependent functions. */
28 
load_immediate(struct sljit_compiler * compiler,sljit_s32 dst_ar,sljit_sw imm)29 static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 dst_ar, sljit_sw imm)
30 {
31 	sljit_s32 shift = 32;
32 	sljit_s32 shift2;
33 	sljit_s32 inv = 0;
34 	sljit_ins ins;
35 	sljit_uw uimm;
36 
37 	if (!(imm & ~0xffff))
38 		return push_inst(compiler, ORI | SA(0) | TA(dst_ar) | IMM(imm), dst_ar);
39 
40 	if (imm < 0 && imm >= SIMM_MIN)
41 		return push_inst(compiler, ADDIU | SA(0) | TA(dst_ar) | IMM(imm), dst_ar);
42 
43 	if (imm <= 0x7fffffffl && imm >= -0x80000000l) {
44 		FAIL_IF(push_inst(compiler, LUI | TA(dst_ar) | IMM(imm >> 16), dst_ar));
45 		return (imm & 0xffff) ? push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(imm), dst_ar) : SLJIT_SUCCESS;
46 	}
47 
48 	/* Zero extended number. */
49 	uimm = imm;
50 	if (imm < 0) {
51 		uimm = ~imm;
52 		inv = 1;
53 	}
54 
55 	while (!(uimm & 0xff00000000000000l)) {
56 		shift -= 8;
57 		uimm <<= 8;
58 	}
59 
60 	if (!(uimm & 0xf000000000000000l)) {
61 		shift -= 4;
62 		uimm <<= 4;
63 	}
64 
65 	if (!(uimm & 0xc000000000000000l)) {
66 		shift -= 2;
67 		uimm <<= 2;
68 	}
69 
70 	if ((sljit_sw)uimm < 0) {
71 		uimm >>= 1;
72 		shift += 1;
73 	}
74 	SLJIT_ASSERT(((uimm & 0xc000000000000000l) == 0x4000000000000000l) && (shift > 0) && (shift <= 32));
75 
76 	if (inv)
77 		uimm = ~uimm;
78 
79 	FAIL_IF(push_inst(compiler, LUI | TA(dst_ar) | IMM(uimm >> 48), dst_ar));
80 	if (uimm & 0x0000ffff00000000l)
81 		FAIL_IF(push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(uimm >> 32), dst_ar));
82 
83 	imm &= (1l << shift) - 1;
84 	if (!(imm & ~0xffff)) {
85 		ins = (shift == 32) ? DSLL32 : DSLL;
86 		if (shift < 32)
87 			ins |= SH_IMM(shift);
88 		FAIL_IF(push_inst(compiler, ins | TA(dst_ar) | DA(dst_ar), dst_ar));
89 		return !(imm & 0xffff) ? SLJIT_SUCCESS : push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(imm), dst_ar);
90 	}
91 
92 	/* Double shifts needs to be performed. */
93 	uimm <<= 32;
94 	shift2 = shift - 16;
95 
96 	while (!(uimm & 0xf000000000000000l)) {
97 		shift2 -= 4;
98 		uimm <<= 4;
99 	}
100 
101 	if (!(uimm & 0xc000000000000000l)) {
102 		shift2 -= 2;
103 		uimm <<= 2;
104 	}
105 
106 	if (!(uimm & 0x8000000000000000l)) {
107 		shift2--;
108 		uimm <<= 1;
109 	}
110 
111 	SLJIT_ASSERT((uimm & 0x8000000000000000l) && (shift2 > 0) && (shift2 <= 16));
112 
113 	FAIL_IF(push_inst(compiler, DSLL | TA(dst_ar) | DA(dst_ar) | SH_IMM(shift - shift2), dst_ar));
114 	FAIL_IF(push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(uimm >> 48), dst_ar));
115 	FAIL_IF(push_inst(compiler, DSLL | TA(dst_ar) | DA(dst_ar) | SH_IMM(shift2), dst_ar));
116 
117 	imm &= (1l << shift2) - 1;
118 	return !(imm & 0xffff) ? SLJIT_SUCCESS : push_inst(compiler, ORI | SA(dst_ar) | TA(dst_ar) | IMM(imm), dst_ar);
119 }
120 
121 #define SELECT_OP(a, b) \
122 	(!(op & SLJIT_I32_OP) ? a : b)
123 
124 #define EMIT_LOGICAL(op_imm, op_norm) \
125 	if (flags & SRC2_IMM) { \
126 		if (op & SLJIT_SET_Z) \
127 			FAIL_IF(push_inst(compiler, op_imm | S(src1) | TA(EQUAL_FLAG) | IMM(src2), EQUAL_FLAG)); \
128 		if (!(flags & UNUSED_DEST)) \
129 			FAIL_IF(push_inst(compiler, op_imm | S(src1) | T(dst) | IMM(src2), DR(dst))); \
130 	} \
131 	else { \
132 		if (op & SLJIT_SET_Z) \
133 			FAIL_IF(push_inst(compiler, op_norm | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG)); \
134 		if (!(flags & UNUSED_DEST)) \
135 			FAIL_IF(push_inst(compiler, op_norm | S(src1) | T(src2) | D(dst), DR(dst))); \
136 	}
137 
138 #define EMIT_SHIFT(op_dimm, op_dimm32, op_imm, op_dv, op_v) \
139 	if (flags & SRC2_IMM) { \
140 		if (src2 >= 32) { \
141 			SLJIT_ASSERT(!(op & SLJIT_I32_OP)); \
142 			ins = op_dimm32; \
143 			src2 -= 32; \
144 		} \
145 		else \
146 			ins = (op & SLJIT_I32_OP) ? op_imm : op_dimm; \
147 		if (op & SLJIT_SET_Z) \
148 			FAIL_IF(push_inst(compiler, ins | T(src1) | DA(EQUAL_FLAG) | SH_IMM(src2), EQUAL_FLAG)); \
149 		if (!(flags & UNUSED_DEST)) \
150 			FAIL_IF(push_inst(compiler, ins | T(src1) | D(dst) | SH_IMM(src2), DR(dst))); \
151 	} \
152 	else { \
153 		ins = (op & SLJIT_I32_OP) ? op_v : op_dv; \
154 		if (op & SLJIT_SET_Z) \
155 			FAIL_IF(push_inst(compiler, ins | S(src2) | T(src1) | DA(EQUAL_FLAG), EQUAL_FLAG)); \
156 		if (!(flags & UNUSED_DEST)) \
157 			FAIL_IF(push_inst(compiler, ins | S(src2) | T(src1) | D(dst), DR(dst))); \
158 	}
159 
emit_single_op(struct sljit_compiler * compiler,sljit_s32 op,sljit_s32 flags,sljit_s32 dst,sljit_s32 src1,sljit_sw src2)160 static SLJIT_INLINE sljit_s32 emit_single_op(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 flags,
161 	sljit_s32 dst, sljit_s32 src1, sljit_sw src2)
162 {
163 	sljit_ins ins;
164 	sljit_s32 is_overflow, is_carry, is_handled;
165 
166 	switch (GET_OPCODE(op)) {
167 	case SLJIT_MOV:
168 	case SLJIT_MOV_P:
169 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
170 		if (dst != src2)
171 			return push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src2) | TA(0) | D(dst), DR(dst));
172 		return SLJIT_SUCCESS;
173 
174 	case SLJIT_MOV_U8:
175 	case SLJIT_MOV_S8:
176 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
177 		if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
178 			if (op == SLJIT_MOV_S8) {
179 				FAIL_IF(push_inst(compiler, DSLL32 | T(src2) | D(dst) | SH_IMM(24), DR(dst)));
180 				return push_inst(compiler, DSRA32 | T(dst) | D(dst) | SH_IMM(24), DR(dst));
181 			}
182 			return push_inst(compiler, ANDI | S(src2) | T(dst) | IMM(0xff), DR(dst));
183 		}
184 		else {
185 			SLJIT_ASSERT(dst == src2);
186 		}
187 		return SLJIT_SUCCESS;
188 
189 	case SLJIT_MOV_U16:
190 	case SLJIT_MOV_S16:
191 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
192 		if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
193 			if (op == SLJIT_MOV_S16) {
194 				FAIL_IF(push_inst(compiler, DSLL32 | T(src2) | D(dst) | SH_IMM(16), DR(dst)));
195 				return push_inst(compiler, DSRA32 | T(dst) | D(dst) | SH_IMM(16), DR(dst));
196 			}
197 			return push_inst(compiler, ANDI | S(src2) | T(dst) | IMM(0xffff), DR(dst));
198 		}
199 		else {
200 			SLJIT_ASSERT(dst == src2);
201 		}
202 		return SLJIT_SUCCESS;
203 
204 	case SLJIT_MOV_U32:
205 		SLJIT_ASSERT(!(op & SLJIT_I32_OP));
206 		FAIL_IF(push_inst(compiler, DSLL32 | T(src2) | D(dst) | SH_IMM(0), DR(dst)));
207 		return push_inst(compiler, DSRL32 | T(dst) | D(dst) | SH_IMM(0), DR(dst));
208 
209 	case SLJIT_MOV_S32:
210 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
211 		return push_inst(compiler, SLL | T(src2) | D(dst) | SH_IMM(0), DR(dst));
212 
213 	case SLJIT_NOT:
214 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
215 		if (op & SLJIT_SET_Z)
216 			FAIL_IF(push_inst(compiler, NOR | S(src2) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
217 		if (!(flags & UNUSED_DEST))
218 			FAIL_IF(push_inst(compiler, NOR | S(src2) | T(src2) | D(dst), DR(dst)));
219 		return SLJIT_SUCCESS;
220 
221 	case SLJIT_CLZ:
222 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
223 #if (defined SLJIT_MIPS_R1 && SLJIT_MIPS_R1)
224 		if (op & SLJIT_SET_Z)
225 			FAIL_IF(push_inst(compiler, SELECT_OP(DCLZ, CLZ) | S(src2) | TA(EQUAL_FLAG) | DA(EQUAL_FLAG), EQUAL_FLAG));
226 		if (!(flags & UNUSED_DEST))
227 			FAIL_IF(push_inst(compiler, SELECT_OP(DCLZ, CLZ) | S(src2) | T(dst) | D(dst), DR(dst)));
228 #else
229 		if (SLJIT_UNLIKELY(flags & UNUSED_DEST)) {
230 			FAIL_IF(push_inst(compiler, SELECT_OP(DSRL32, SRL) | T(src2) | DA(EQUAL_FLAG) | SH_IMM(31), EQUAL_FLAG));
231 			return push_inst(compiler, XORI | SA(EQUAL_FLAG) | TA(EQUAL_FLAG) | IMM(1), EQUAL_FLAG);
232 		}
233 		/* Nearly all instructions are unmovable in the following sequence. */
234 		FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src2) | TA(0) | D(TMP_REG1), DR(TMP_REG1)));
235 		/* Check zero. */
236 		FAIL_IF(push_inst(compiler, BEQ | S(TMP_REG1) | TA(0) | IMM(5), UNMOVABLE_INS));
237 		FAIL_IF(push_inst(compiler, ORI | SA(0) | T(dst) | IMM((op & SLJIT_I32_OP) ? 32 : 64), UNMOVABLE_INS));
238 		FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | SA(0) | T(dst) | IMM(-1), DR(dst)));
239 		/* Loop for searching the highest bit. */
240 		FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(dst) | T(dst) | IMM(1), DR(dst)));
241 		FAIL_IF(push_inst(compiler, BGEZ | S(TMP_REG1) | IMM(-2), UNMOVABLE_INS));
242 		FAIL_IF(push_inst(compiler, SELECT_OP(DSLL, SLL) | T(TMP_REG1) | D(TMP_REG1) | SH_IMM(1), UNMOVABLE_INS));
243 #endif
244 		return SLJIT_SUCCESS;
245 
246 	case SLJIT_ADD:
247 		is_overflow = GET_FLAG_TYPE(op) == SLJIT_OVERFLOW;
248 		is_carry = GET_FLAG_TYPE(op) == GET_FLAG_TYPE(SLJIT_SET_CARRY);
249 
250 		if (flags & SRC2_IMM) {
251 			if (is_overflow) {
252 				if (src2 >= 0)
253 					FAIL_IF(push_inst(compiler, OR | S(src1) | T(src1) | DA(EQUAL_FLAG), EQUAL_FLAG));
254 				else
255 					FAIL_IF(push_inst(compiler, NOR | S(src1) | T(src1) | DA(EQUAL_FLAG), EQUAL_FLAG));
256 			}
257 			else if (op & SLJIT_SET_Z)
258 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | TA(EQUAL_FLAG) | IMM(src2), EQUAL_FLAG));
259 
260 			if (is_overflow || is_carry) {
261 				if (src2 >= 0)
262 					FAIL_IF(push_inst(compiler, ORI | S(src1) | TA(OTHER_FLAG) | IMM(src2), OTHER_FLAG));
263 				else {
264 					FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | SA(0) | TA(OTHER_FLAG) | IMM(src2), OTHER_FLAG));
265 					FAIL_IF(push_inst(compiler, OR | S(src1) | TA(OTHER_FLAG) | DA(OTHER_FLAG), OTHER_FLAG));
266 				}
267 			}
268 			/* dst may be the same as src1 or src2. */
269 			if (!(flags & UNUSED_DEST) || (op & VARIABLE_FLAG_MASK))
270 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | T(dst) | IMM(src2), DR(dst)));
271 		}
272 		else {
273 			if (is_overflow)
274 				FAIL_IF(push_inst(compiler, XOR | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
275 			else if (op & SLJIT_SET_Z)
276 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
277 
278 			if (is_overflow || is_carry)
279 				FAIL_IF(push_inst(compiler, OR | S(src1) | T(src2) | DA(OTHER_FLAG), OTHER_FLAG));
280 			/* dst may be the same as src1 or src2. */
281 			if (!(flags & UNUSED_DEST) || (op & VARIABLE_FLAG_MASK))
282 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src1) | T(src2) | D(dst), DR(dst)));
283 		}
284 
285 		/* a + b >= a | b (otherwise, the carry should be set to 1). */
286 		if (is_overflow || is_carry)
287 			FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(OTHER_FLAG) | DA(OTHER_FLAG), OTHER_FLAG));
288 		if (!is_overflow)
289 			return SLJIT_SUCCESS;
290 		FAIL_IF(push_inst(compiler, SELECT_OP(DSLL32, SLL) | TA(OTHER_FLAG) | D(TMP_REG1) | SH_IMM(31), DR(TMP_REG1)));
291 		FAIL_IF(push_inst(compiler, XOR | S(TMP_REG1) | TA(EQUAL_FLAG) | DA(EQUAL_FLAG), EQUAL_FLAG));
292 		FAIL_IF(push_inst(compiler, XOR | S(dst) | TA(EQUAL_FLAG) | DA(OTHER_FLAG), OTHER_FLAG));
293 		if (op & SLJIT_SET_Z)
294 			FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(dst) | TA(0) | DA(EQUAL_FLAG), EQUAL_FLAG));
295 		return push_inst(compiler, SELECT_OP(DSRL32, SRL) | TA(OTHER_FLAG) | DA(OTHER_FLAG) | SH_IMM(31), OTHER_FLAG);
296 
297 	case SLJIT_ADDC:
298 		is_carry = GET_FLAG_TYPE(op) == GET_FLAG_TYPE(SLJIT_SET_CARRY);
299 
300 		if (flags & SRC2_IMM) {
301 			if (is_carry) {
302 				if (src2 >= 0)
303 					FAIL_IF(push_inst(compiler, ORI | S(src1) | TA(EQUAL_FLAG) | IMM(src2), EQUAL_FLAG));
304 				else {
305 					FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | SA(0) | TA(EQUAL_FLAG) | IMM(src2), EQUAL_FLAG));
306 					FAIL_IF(push_inst(compiler, OR | S(src1) | TA(EQUAL_FLAG) | DA(EQUAL_FLAG), EQUAL_FLAG));
307 				}
308 			}
309 			FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | T(dst) | IMM(src2), DR(dst)));
310 		} else {
311 			if (is_carry)
312 				FAIL_IF(push_inst(compiler, OR | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
313 			/* dst may be the same as src1 or src2. */
314 			FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src1) | T(src2) | D(dst), DR(dst)));
315 		}
316 		if (is_carry)
317 			FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(EQUAL_FLAG) | DA(EQUAL_FLAG), EQUAL_FLAG));
318 
319 		FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(dst) | TA(OTHER_FLAG) | D(dst), DR(dst)));
320 		if (!is_carry)
321 			return SLJIT_SUCCESS;
322 
323 		/* Set ULESS_FLAG (dst == 0) && (OTHER_FLAG == 1). */
324 		FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(OTHER_FLAG) | DA(OTHER_FLAG), OTHER_FLAG));
325 		/* Set carry flag. */
326 		return push_inst(compiler, OR | SA(OTHER_FLAG) | TA(EQUAL_FLAG) | DA(OTHER_FLAG), OTHER_FLAG);
327 
328 	case SLJIT_SUB:
329 		if ((flags & SRC2_IMM) && src2 == SIMM_MIN) {
330 			FAIL_IF(push_inst(compiler, ADDIU | SA(0) | T(TMP_REG2) | IMM(src2), DR(TMP_REG2)));
331 			src2 = TMP_REG2;
332 			flags &= ~SRC2_IMM;
333 		}
334 
335 		is_handled = 0;
336 
337 		if (flags & SRC2_IMM) {
338 			if (GET_FLAG_TYPE(op) == SLJIT_LESS || GET_FLAG_TYPE(op) == SLJIT_GREATER_EQUAL) {
339 				FAIL_IF(push_inst(compiler, SLTIU | S(src1) | TA(OTHER_FLAG) | IMM(src2), OTHER_FLAG));
340 				is_handled = 1;
341 			}
342 			else if (GET_FLAG_TYPE(op) == SLJIT_SIG_LESS || GET_FLAG_TYPE(op) == SLJIT_SIG_GREATER_EQUAL) {
343 				FAIL_IF(push_inst(compiler, SLTI | S(src1) | TA(OTHER_FLAG) | IMM(src2), OTHER_FLAG));
344 				is_handled = 1;
345 			}
346 		}
347 
348 		if (!is_handled && GET_FLAG_TYPE(op) >= SLJIT_LESS && GET_FLAG_TYPE(op) <= SLJIT_SIG_LESS_EQUAL) {
349 			is_handled = 1;
350 
351 			if (flags & SRC2_IMM) {
352 				FAIL_IF(push_inst(compiler, ADDIU | SA(0) | T(TMP_REG2) | IMM(src2), DR(TMP_REG2)));
353 				src2 = TMP_REG2;
354 				flags &= ~SRC2_IMM;
355 			}
356 
357 			if (GET_FLAG_TYPE(op) == SLJIT_LESS || GET_FLAG_TYPE(op) == SLJIT_GREATER_EQUAL) {
358 				FAIL_IF(push_inst(compiler, SLTU | S(src1) | T(src2) | DA(OTHER_FLAG), OTHER_FLAG));
359 			}
360 			else if (GET_FLAG_TYPE(op) == SLJIT_GREATER || GET_FLAG_TYPE(op) == SLJIT_LESS_EQUAL)
361 			{
362 				FAIL_IF(push_inst(compiler, SLTU | S(src2) | T(src1) | DA(OTHER_FLAG), OTHER_FLAG));
363 			}
364 			else if (GET_FLAG_TYPE(op) == SLJIT_SIG_LESS || GET_FLAG_TYPE(op) == SLJIT_SIG_GREATER_EQUAL) {
365 				FAIL_IF(push_inst(compiler, SLT | S(src1) | T(src2) | DA(OTHER_FLAG), OTHER_FLAG));
366 			}
367 			else if (GET_FLAG_TYPE(op) == SLJIT_SIG_GREATER || GET_FLAG_TYPE(op) == SLJIT_SIG_LESS_EQUAL)
368 			{
369 				FAIL_IF(push_inst(compiler, SLT | S(src2) | T(src1) | DA(OTHER_FLAG), OTHER_FLAG));
370 			}
371 		}
372 
373 		if (is_handled) {
374 			if (flags & SRC2_IMM) {
375 				if (op & SLJIT_SET_Z)
376 					FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | TA(EQUAL_FLAG) | IMM(-src2), EQUAL_FLAG));
377 				if (!(flags & UNUSED_DEST))
378 					return push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | T(dst) | IMM(-src2), DR(dst));
379 			}
380 			else {
381 				if (op & SLJIT_SET_Z)
382 					FAIL_IF(push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
383 				if (!(flags & UNUSED_DEST))
384 					return push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(src1) | T(src2) | D(dst), DR(dst));
385 			}
386 			return SLJIT_SUCCESS;
387 		}
388 
389 		is_overflow = GET_FLAG_TYPE(op) == SLJIT_OVERFLOW;
390 		is_carry = GET_FLAG_TYPE(op) == GET_FLAG_TYPE(SLJIT_SET_CARRY);
391 
392 		if (flags & SRC2_IMM) {
393 			if (is_overflow) {
394 				if (src2 >= 0)
395 					FAIL_IF(push_inst(compiler, OR | S(src1) | T(src1) | DA(EQUAL_FLAG), EQUAL_FLAG));
396 				else
397 					FAIL_IF(push_inst(compiler, NOR | S(src1) | T(src1) | DA(EQUAL_FLAG), EQUAL_FLAG));
398 			}
399 			else if (op & SLJIT_SET_Z)
400 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | TA(EQUAL_FLAG) | IMM(-src2), EQUAL_FLAG));
401 
402 			if (is_overflow || is_carry)
403 				FAIL_IF(push_inst(compiler, SLTIU | S(src1) | TA(OTHER_FLAG) | IMM(src2), OTHER_FLAG));
404 			/* dst may be the same as src1 or src2. */
405 			if (!(flags & UNUSED_DEST) || (op & VARIABLE_FLAG_MASK))
406 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | T(dst) | IMM(-src2), DR(dst)));
407 		}
408 		else {
409 			if (is_overflow)
410 				FAIL_IF(push_inst(compiler, XOR | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
411 			else if (op & SLJIT_SET_Z)
412 				FAIL_IF(push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
413 
414 			if (is_overflow || is_carry)
415 				FAIL_IF(push_inst(compiler, SLTU | S(src1) | T(src2) | DA(OTHER_FLAG), OTHER_FLAG));
416 			/* dst may be the same as src1 or src2. */
417 			if (!(flags & UNUSED_DEST) || (op & VARIABLE_FLAG_MASK))
418 				FAIL_IF(push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(src1) | T(src2) | D(dst), DR(dst)));
419 		}
420 
421 		if (!is_overflow)
422 			return SLJIT_SUCCESS;
423 		FAIL_IF(push_inst(compiler, SELECT_OP(DSLL32, SLL) | TA(OTHER_FLAG) | D(TMP_REG1) | SH_IMM(31), DR(TMP_REG1)));
424 		FAIL_IF(push_inst(compiler, XOR | S(TMP_REG1) | TA(EQUAL_FLAG) | DA(EQUAL_FLAG), EQUAL_FLAG));
425 		FAIL_IF(push_inst(compiler, XOR | S(dst) | TA(EQUAL_FLAG) | DA(OTHER_FLAG), OTHER_FLAG));
426 		if (op & SLJIT_SET_Z)
427 			FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(dst) | TA(0) | DA(EQUAL_FLAG), EQUAL_FLAG));
428 		return push_inst(compiler, SELECT_OP(DSRL32, SRL) | TA(OTHER_FLAG) | DA(OTHER_FLAG) | SH_IMM(31), OTHER_FLAG);
429 
430 	case SLJIT_SUBC:
431 		if ((flags & SRC2_IMM) && src2 == SIMM_MIN) {
432 			FAIL_IF(push_inst(compiler, ADDIU | SA(0) | T(TMP_REG2) | IMM(src2), DR(TMP_REG2)));
433 			src2 = TMP_REG2;
434 			flags &= ~SRC2_IMM;
435 		}
436 
437 		is_carry = GET_FLAG_TYPE(op) == GET_FLAG_TYPE(SLJIT_SET_CARRY);
438 
439 		if (flags & SRC2_IMM) {
440 			if (is_carry)
441 				FAIL_IF(push_inst(compiler, SLTIU | S(src1) | TA(EQUAL_FLAG) | IMM(src2), EQUAL_FLAG));
442 			/* dst may be the same as src1 or src2. */
443 			FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | T(dst) | IMM(-src2), DR(dst)));
444 		}
445 		else {
446 			if (is_carry)
447 				FAIL_IF(push_inst(compiler, SLTU | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
448 			/* dst may be the same as src1 or src2. */
449 			FAIL_IF(push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(src1) | T(src2) | D(dst), DR(dst)));
450 		}
451 
452 		if (is_carry)
453 			FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(OTHER_FLAG) | D(TMP_REG1), DR(TMP_REG1)));
454 
455 		FAIL_IF(push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(dst) | TA(OTHER_FLAG) | D(dst), DR(dst)));
456 		return (is_carry) ? push_inst(compiler, OR | SA(EQUAL_FLAG) | T(TMP_REG1) | DA(OTHER_FLAG), OTHER_FLAG) : SLJIT_SUCCESS;
457 
458 	case SLJIT_MUL:
459 		SLJIT_ASSERT(!(flags & SRC2_IMM));
460 
461 		if (GET_FLAG_TYPE(op) != SLJIT_MUL_OVERFLOW) {
462 #if (defined SLJIT_MIPS_R1 && SLJIT_MIPS_R1)
463 			if (op & SLJIT_I32_OP)
464 				return push_inst(compiler, MUL | S(src1) | T(src2) | D(dst), DR(dst));
465 			FAIL_IF(push_inst(compiler, DMULT | S(src1) | T(src2), MOVABLE_INS));
466 			return push_inst(compiler, MFLO | D(dst), DR(dst));
467 #else
468 			FAIL_IF(push_inst(compiler, SELECT_OP(DMULT, MULT) | S(src1) | T(src2), MOVABLE_INS));
469 			return push_inst(compiler, MFLO | D(dst), DR(dst));
470 #endif
471 		}
472 		FAIL_IF(push_inst(compiler, SELECT_OP(DMULT, MULT) | S(src1) | T(src2), MOVABLE_INS));
473 		FAIL_IF(push_inst(compiler, MFHI | DA(EQUAL_FLAG), EQUAL_FLAG));
474 		FAIL_IF(push_inst(compiler, MFLO | D(dst), DR(dst)));
475 		FAIL_IF(push_inst(compiler, SELECT_OP(DSRA32, SRA) | T(dst) | DA(OTHER_FLAG) | SH_IMM(31), OTHER_FLAG));
476 		return push_inst(compiler, SELECT_OP(DSUBU, SUBU) | SA(EQUAL_FLAG) | TA(OTHER_FLAG) | DA(OTHER_FLAG), OTHER_FLAG);
477 
478 	case SLJIT_AND:
479 		EMIT_LOGICAL(ANDI, AND);
480 		return SLJIT_SUCCESS;
481 
482 	case SLJIT_OR:
483 		EMIT_LOGICAL(ORI, OR);
484 		return SLJIT_SUCCESS;
485 
486 	case SLJIT_XOR:
487 		EMIT_LOGICAL(XORI, XOR);
488 		return SLJIT_SUCCESS;
489 
490 	case SLJIT_SHL:
491 		EMIT_SHIFT(DSLL, DSLL32, SLL, DSLLV, SLLV);
492 		return SLJIT_SUCCESS;
493 
494 	case SLJIT_LSHR:
495 		EMIT_SHIFT(DSRL, DSRL32, SRL, DSRLV, SRLV);
496 		return SLJIT_SUCCESS;
497 
498 	case SLJIT_ASHR:
499 		EMIT_SHIFT(DSRA, DSRA32, SRA, DSRAV, SRAV);
500 		return SLJIT_SUCCESS;
501 	}
502 
503 	SLJIT_UNREACHABLE();
504 	return SLJIT_SUCCESS;
505 }
506 
emit_const(struct sljit_compiler * compiler,sljit_s32 dst,sljit_sw init_value)507 static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw init_value)
508 {
509 	FAIL_IF(push_inst(compiler, LUI | T(dst) | IMM(init_value >> 48), DR(dst)));
510 	FAIL_IF(push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value >> 32), DR(dst)));
511 	FAIL_IF(push_inst(compiler, DSLL | T(dst) | D(dst) | SH_IMM(16), DR(dst)));
512 	FAIL_IF(push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value >> 16), DR(dst)));
513 	FAIL_IF(push_inst(compiler, DSLL | T(dst) | D(dst) | SH_IMM(16), DR(dst)));
514 	return push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value), DR(dst));
515 }
516 
sljit_set_jump_addr(sljit_uw addr,sljit_uw new_target,sljit_sw executable_offset)517 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
518 {
519 	sljit_ins *inst = (sljit_ins *)addr;
520 
521 	inst[0] = (inst[0] & 0xffff0000) | ((new_target >> 48) & 0xffff);
522 	inst[1] = (inst[1] & 0xffff0000) | ((new_target >> 32) & 0xffff);
523 	inst[3] = (inst[3] & 0xffff0000) | ((new_target >> 16) & 0xffff);
524 	inst[5] = (inst[5] & 0xffff0000) | (new_target & 0xffff);
525 	inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
526 	SLJIT_CACHE_FLUSH(inst, inst + 6);
527 }
528 
sljit_set_const(sljit_uw addr,sljit_sw new_constant,sljit_sw executable_offset)529 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant, sljit_sw executable_offset)
530 {
531 	sljit_ins *inst = (sljit_ins *)addr;
532 
533 	inst[0] = (inst[0] & 0xffff0000) | ((new_constant >> 48) & 0xffff);
534 	inst[1] = (inst[1] & 0xffff0000) | ((new_constant >> 32) & 0xffff);
535 	inst[3] = (inst[3] & 0xffff0000) | ((new_constant >> 16) & 0xffff);
536 	inst[5] = (inst[5] & 0xffff0000) | (new_constant & 0xffff);
537 	inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
538 	SLJIT_CACHE_FLUSH(inst, inst + 6);
539 }
540