1 /*
2  *    Stack-less Just-In-Time compiler
3  *
4  *    Copyright 2009-2012 Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without modification, are
7  * permitted provided that the following conditions are met:
8  *
9  *   1. Redistributions of source code must retain the above copyright notice, this list of
10  *      conditions and the following disclaimer.
11  *
12  *   2. Redistributions in binary form must reproduce the above copyright notice, this list
13  *      of conditions and the following disclaimer in the documentation and/or other materials
14  *      provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19  * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
21  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
22  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 /* mips 64-bit arch dependent functions. */
28 
load_immediate(struct sljit_compiler * compiler,sljit_si dst_ar,sljit_sw imm)29 static sljit_si load_immediate(struct sljit_compiler *compiler, sljit_si dst_ar, sljit_sw imm)
30 {
31 	sljit_si shift = 32;
32 	sljit_si shift2;
33 	sljit_si 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_INT_OP) ? a : b)
123 
124 #define EMIT_LOGICAL(op_imm, op_norm) \
125 	if (flags & SRC2_IMM) { \
126 		if (op & SLJIT_SET_E) \
127 			FAIL_IF(push_inst(compiler, op_imm | S(src1) | TA(EQUAL_FLAG) | IMM(src2), EQUAL_FLAG)); \
128 		if (CHECK_FLAGS(SLJIT_SET_E)) \
129 			FAIL_IF(push_inst(compiler, op_imm | S(src1) | T(dst) | IMM(src2), DR(dst))); \
130 	} \
131 	else { \
132 		if (op & SLJIT_SET_E) \
133 			FAIL_IF(push_inst(compiler, op_norm | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG)); \
134 		if (CHECK_FLAGS(SLJIT_SET_E)) \
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_INT_OP)); \
142 			ins = op_dimm32; \
143 			src2 -= 32; \
144 		} \
145 		else \
146 			ins = (op & SLJIT_INT_OP) ? op_imm : op_dimm; \
147 		if (op & SLJIT_SET_E) \
148 			FAIL_IF(push_inst(compiler, ins | T(src1) | DA(EQUAL_FLAG) | SH_IMM(src2), EQUAL_FLAG)); \
149 		if (CHECK_FLAGS(SLJIT_SET_E)) \
150 			FAIL_IF(push_inst(compiler, ins | T(src1) | D(dst) | SH_IMM(src2), DR(dst))); \
151 	} \
152 	else { \
153 		ins = (op & SLJIT_INT_OP) ? op_v : op_dv; \
154 		if (op & SLJIT_SET_E) \
155 			FAIL_IF(push_inst(compiler, ins | S(src2) | T(src1) | DA(EQUAL_FLAG), EQUAL_FLAG)); \
156 		if (CHECK_FLAGS(SLJIT_SET_E)) \
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_si op,sljit_si flags,sljit_si dst,sljit_si src1,sljit_sw src2)160 static SLJIT_INLINE sljit_si emit_single_op(struct sljit_compiler *compiler, sljit_si op, sljit_si flags,
161 	sljit_si dst, sljit_si src1, sljit_sw src2)
162 {
163 	sljit_ins ins;
164 
165 	switch (GET_OPCODE(op)) {
166 	case SLJIT_MOV:
167 	case SLJIT_MOV_P:
168 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
169 		if (dst != src2)
170 			return push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src2) | TA(0) | D(dst), DR(dst));
171 		return SLJIT_SUCCESS;
172 
173 	case SLJIT_MOV_UB:
174 	case SLJIT_MOV_SB:
175 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
176 		if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
177 			if (op == SLJIT_MOV_SB) {
178 				FAIL_IF(push_inst(compiler, DSLL32 | T(src2) | D(dst) | SH_IMM(24), DR(dst)));
179 				return push_inst(compiler, DSRA32 | T(dst) | D(dst) | SH_IMM(24), DR(dst));
180 			}
181 			return push_inst(compiler, ANDI | S(src2) | T(dst) | IMM(0xff), DR(dst));
182 		}
183 		else if (dst != src2)
184 			SLJIT_ASSERT_STOP();
185 		return SLJIT_SUCCESS;
186 
187 	case SLJIT_MOV_UH:
188 	case SLJIT_MOV_SH:
189 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
190 		if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
191 			if (op == SLJIT_MOV_SH) {
192 				FAIL_IF(push_inst(compiler, DSLL32 | T(src2) | D(dst) | SH_IMM(16), DR(dst)));
193 				return push_inst(compiler, DSRA32 | T(dst) | D(dst) | SH_IMM(16), DR(dst));
194 			}
195 			return push_inst(compiler, ANDI | S(src2) | T(dst) | IMM(0xffff), DR(dst));
196 		}
197 		else if (dst != src2)
198 			SLJIT_ASSERT_STOP();
199 		return SLJIT_SUCCESS;
200 
201 	case SLJIT_MOV_UI:
202 		SLJIT_ASSERT(!(op & SLJIT_INT_OP));
203 		FAIL_IF(push_inst(compiler, DSLL32 | T(src2) | D(dst) | SH_IMM(0), DR(dst)));
204 		return push_inst(compiler, DSRL32 | T(dst) | D(dst) | SH_IMM(0), DR(dst));
205 
206 	case SLJIT_MOV_SI:
207 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
208 		return push_inst(compiler, SLL | T(src2) | D(dst) | SH_IMM(0), DR(dst));
209 
210 	case SLJIT_NOT:
211 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
212 		if (op & SLJIT_SET_E)
213 			FAIL_IF(push_inst(compiler, NOR | S(src2) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
214 		if (CHECK_FLAGS(SLJIT_SET_E))
215 			FAIL_IF(push_inst(compiler, NOR | S(src2) | T(src2) | D(dst), DR(dst)));
216 		return SLJIT_SUCCESS;
217 
218 	case SLJIT_CLZ:
219 		SLJIT_ASSERT(src1 == TMP_REG1 && !(flags & SRC2_IMM));
220 #if (defined SLJIT_MIPS_R1 && SLJIT_MIPS_R1)
221 		if (op & SLJIT_SET_E)
222 			FAIL_IF(push_inst(compiler, SELECT_OP(DCLZ, CLZ) | S(src2) | TA(EQUAL_FLAG) | DA(EQUAL_FLAG), EQUAL_FLAG));
223 		if (CHECK_FLAGS(SLJIT_SET_E))
224 			FAIL_IF(push_inst(compiler, SELECT_OP(DCLZ, CLZ) | S(src2) | T(dst) | D(dst), DR(dst)));
225 #else
226 		if (SLJIT_UNLIKELY(flags & UNUSED_DEST)) {
227 			FAIL_IF(push_inst(compiler, SELECT_OP(DSRL32, SRL) | T(src2) | DA(EQUAL_FLAG) | SH_IMM(31), EQUAL_FLAG));
228 			return push_inst(compiler, XORI | SA(EQUAL_FLAG) | TA(EQUAL_FLAG) | IMM(1), EQUAL_FLAG);
229 		}
230 		/* Nearly all instructions are unmovable in the following sequence. */
231 		FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src2) | TA(0) | D(TMP_REG1), DR(TMP_REG1)));
232 		/* Check zero. */
233 		FAIL_IF(push_inst(compiler, BEQ | S(TMP_REG1) | TA(0) | IMM(5), UNMOVABLE_INS));
234 		FAIL_IF(push_inst(compiler, ORI | SA(0) | T(dst) | IMM((op & SLJIT_INT_OP) ? 32 : 64), UNMOVABLE_INS));
235 		FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | SA(0) | T(dst) | IMM(-1), DR(dst)));
236 		/* Loop for searching the highest bit. */
237 		FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(dst) | T(dst) | IMM(1), DR(dst)));
238 		FAIL_IF(push_inst(compiler, BGEZ | S(TMP_REG1) | IMM(-2), UNMOVABLE_INS));
239 		FAIL_IF(push_inst(compiler, SELECT_OP(DSLL, SLL) | T(TMP_REG1) | D(TMP_REG1) | SH_IMM(1), UNMOVABLE_INS));
240 		if (op & SLJIT_SET_E)
241 			return push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(dst) | TA(0) | DA(EQUAL_FLAG), EQUAL_FLAG);
242 #endif
243 		return SLJIT_SUCCESS;
244 
245 	case SLJIT_ADD:
246 		if (flags & SRC2_IMM) {
247 			if (op & SLJIT_SET_O) {
248 				if (src2 >= 0)
249 					FAIL_IF(push_inst(compiler, OR | S(src1) | T(src1) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
250 				else
251 					FAIL_IF(push_inst(compiler, NOR | S(src1) | T(src1) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
252 			}
253 			if (op & SLJIT_SET_E)
254 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | TA(EQUAL_FLAG) | IMM(src2), EQUAL_FLAG));
255 			if (op & (SLJIT_SET_C | SLJIT_SET_O)) {
256 				if (src2 >= 0)
257 					FAIL_IF(push_inst(compiler, ORI | S(src1) | TA(ULESS_FLAG) | IMM(src2), ULESS_FLAG));
258 				else {
259 					FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | SA(0) | TA(ULESS_FLAG) | IMM(src2), ULESS_FLAG));
260 					FAIL_IF(push_inst(compiler, OR | S(src1) | TA(ULESS_FLAG) | DA(ULESS_FLAG), ULESS_FLAG));
261 				}
262 			}
263 			/* dst may be the same as src1 or src2. */
264 			if (CHECK_FLAGS(SLJIT_SET_E))
265 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | T(dst) | IMM(src2), DR(dst)));
266 		}
267 		else {
268 			if (op & SLJIT_SET_O)
269 				FAIL_IF(push_inst(compiler, XOR | S(src1) | T(src2) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
270 			if (op & SLJIT_SET_E)
271 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
272 			if (op & (SLJIT_SET_C | SLJIT_SET_O))
273 				FAIL_IF(push_inst(compiler, OR | S(src1) | T(src2) | DA(ULESS_FLAG), ULESS_FLAG));
274 			/* dst may be the same as src1 or src2. */
275 			if (CHECK_FLAGS(SLJIT_SET_E))
276 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src1) | T(src2) | D(dst), DR(dst)));
277 		}
278 
279 		/* a + b >= a | b (otherwise, the carry should be set to 1). */
280 		if (op & (SLJIT_SET_C | SLJIT_SET_O))
281 			FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(ULESS_FLAG) | DA(ULESS_FLAG), ULESS_FLAG));
282 		if (!(op & SLJIT_SET_O))
283 			return SLJIT_SUCCESS;
284 		FAIL_IF(push_inst(compiler, SELECT_OP(DSLL32, SLL) | TA(ULESS_FLAG) | D(TMP_REG1) | SH_IMM(31), DR(TMP_REG1)));
285 		FAIL_IF(push_inst(compiler, XOR | S(TMP_REG1) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
286 		FAIL_IF(push_inst(compiler, XOR | S(dst) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
287 		return push_inst(compiler, SELECT_OP(DSRL32, SLL) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG) | SH_IMM(31), OVERFLOW_FLAG);
288 
289 	case SLJIT_ADDC:
290 		if (flags & SRC2_IMM) {
291 			if (op & SLJIT_SET_C) {
292 				if (src2 >= 0)
293 					FAIL_IF(push_inst(compiler, ORI | S(src1) | TA(OVERFLOW_FLAG) | IMM(src2), OVERFLOW_FLAG));
294 				else {
295 					FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | SA(0) | TA(OVERFLOW_FLAG) | IMM(src2), OVERFLOW_FLAG));
296 					FAIL_IF(push_inst(compiler, OR | S(src1) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
297 				}
298 			}
299 			FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | T(dst) | IMM(src2), DR(dst)));
300 		} else {
301 			if (op & SLJIT_SET_C)
302 				FAIL_IF(push_inst(compiler, OR | S(src1) | T(src2) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
303 			/* dst may be the same as src1 or src2. */
304 			FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(src1) | T(src2) | D(dst), DR(dst)));
305 		}
306 		if (op & SLJIT_SET_C)
307 			FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
308 
309 		FAIL_IF(push_inst(compiler, SELECT_OP(DADDU, ADDU) | S(dst) | TA(ULESS_FLAG) | D(dst), DR(dst)));
310 		if (!(op & SLJIT_SET_C))
311 			return SLJIT_SUCCESS;
312 
313 		/* Set ULESS_FLAG (dst == 0) && (ULESS_FLAG == 1). */
314 		FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(ULESS_FLAG) | DA(ULESS_FLAG), ULESS_FLAG));
315 		/* Set carry flag. */
316 		return push_inst(compiler, OR | SA(ULESS_FLAG) | TA(OVERFLOW_FLAG) | DA(ULESS_FLAG), ULESS_FLAG);
317 
318 	case SLJIT_SUB:
319 		if ((flags & SRC2_IMM) && ((op & (SLJIT_SET_U | SLJIT_SET_S)) || src2 == SIMM_MIN)) {
320 			FAIL_IF(push_inst(compiler, ADDIU | SA(0) | T(TMP_REG2) | IMM(src2), DR(TMP_REG2)));
321 			src2 = TMP_REG2;
322 			flags &= ~SRC2_IMM;
323 		}
324 
325 		if (flags & SRC2_IMM) {
326 			if (op & SLJIT_SET_O) {
327 				if (src2 >= 0)
328 					FAIL_IF(push_inst(compiler, OR | S(src1) | T(src1) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
329 				else
330 					FAIL_IF(push_inst(compiler, NOR | S(src1) | T(src1) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
331 			}
332 			if (op & SLJIT_SET_E)
333 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | TA(EQUAL_FLAG) | IMM(-src2), EQUAL_FLAG));
334 			if (op & (SLJIT_SET_C | SLJIT_SET_O))
335 				FAIL_IF(push_inst(compiler, SLTIU | S(src1) | TA(ULESS_FLAG) | IMM(src2), ULESS_FLAG));
336 			/* dst may be the same as src1 or src2. */
337 			if (CHECK_FLAGS(SLJIT_SET_E))
338 				FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | T(dst) | IMM(-src2), DR(dst)));
339 		}
340 		else {
341 			if (op & SLJIT_SET_O)
342 				FAIL_IF(push_inst(compiler, XOR | S(src1) | T(src2) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
343 			if (op & SLJIT_SET_E)
344 				FAIL_IF(push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(src1) | T(src2) | DA(EQUAL_FLAG), EQUAL_FLAG));
345 			if (op & (SLJIT_SET_U | SLJIT_SET_C | SLJIT_SET_O))
346 				FAIL_IF(push_inst(compiler, SLTU | S(src1) | T(src2) | DA(ULESS_FLAG), ULESS_FLAG));
347 			if (op & SLJIT_SET_U)
348 				FAIL_IF(push_inst(compiler, SLTU | S(src2) | T(src1) | DA(UGREATER_FLAG), UGREATER_FLAG));
349 			if (op & SLJIT_SET_S) {
350 				FAIL_IF(push_inst(compiler, SLT | S(src1) | T(src2) | DA(LESS_FLAG), LESS_FLAG));
351 				FAIL_IF(push_inst(compiler, SLT | S(src2) | T(src1) | DA(GREATER_FLAG), GREATER_FLAG));
352 			}
353 			/* dst may be the same as src1 or src2. */
354 			if (CHECK_FLAGS(SLJIT_SET_E | SLJIT_SET_U | SLJIT_SET_S | SLJIT_SET_C))
355 				FAIL_IF(push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(src1) | T(src2) | D(dst), DR(dst)));
356 		}
357 
358 		if (!(op & SLJIT_SET_O))
359 			return SLJIT_SUCCESS;
360 		FAIL_IF(push_inst(compiler, SELECT_OP(DSLL32, SLL) | TA(ULESS_FLAG) | D(TMP_REG1) | SH_IMM(31), DR(TMP_REG1)));
361 		FAIL_IF(push_inst(compiler, XOR | S(TMP_REG1) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
362 		FAIL_IF(push_inst(compiler, XOR | S(dst) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
363 		return push_inst(compiler, SELECT_OP(DSRL32, SRL) | TA(OVERFLOW_FLAG) | DA(OVERFLOW_FLAG) | SH_IMM(31), OVERFLOW_FLAG);
364 
365 	case SLJIT_SUBC:
366 		if ((flags & SRC2_IMM) && src2 == SIMM_MIN) {
367 			FAIL_IF(push_inst(compiler, ADDIU | SA(0) | T(TMP_REG2) | IMM(src2), DR(TMP_REG2)));
368 			src2 = TMP_REG2;
369 			flags &= ~SRC2_IMM;
370 		}
371 
372 		if (flags & SRC2_IMM) {
373 			if (op & SLJIT_SET_C)
374 				FAIL_IF(push_inst(compiler, SLTIU | S(src1) | TA(OVERFLOW_FLAG) | IMM(src2), OVERFLOW_FLAG));
375 			/* dst may be the same as src1 or src2. */
376 			FAIL_IF(push_inst(compiler, SELECT_OP(DADDIU, ADDIU) | S(src1) | T(dst) | IMM(-src2), DR(dst)));
377 		}
378 		else {
379 			if (op & SLJIT_SET_C)
380 				FAIL_IF(push_inst(compiler, SLTU | S(src1) | T(src2) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG));
381 			/* dst may be the same as src1 or src2. */
382 			FAIL_IF(push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(src1) | T(src2) | D(dst), DR(dst)));
383 		}
384 
385 		if (op & SLJIT_SET_C)
386 			FAIL_IF(push_inst(compiler, SLTU | S(dst) | TA(ULESS_FLAG) | DA(LESS_FLAG), LESS_FLAG));
387 
388 		FAIL_IF(push_inst(compiler, SELECT_OP(DSUBU, SUBU) | S(dst) | TA(ULESS_FLAG) | D(dst), DR(dst)));
389 		return (op & SLJIT_SET_C) ? push_inst(compiler, OR | SA(OVERFLOW_FLAG) | TA(LESS_FLAG) | DA(ULESS_FLAG), ULESS_FLAG) : SLJIT_SUCCESS;
390 
391 	case SLJIT_MUL:
392 		SLJIT_ASSERT(!(flags & SRC2_IMM));
393 		if (!(op & SLJIT_SET_O)) {
394 #if (defined SLJIT_MIPS_R1 && SLJIT_MIPS_R1)
395 			if (op & SLJIT_INT_OP)
396 				return push_inst(compiler, MUL | S(src1) | T(src2) | D(dst), DR(dst));
397 			FAIL_IF(push_inst(compiler, DMULT | S(src1) | T(src2), MOVABLE_INS));
398 			return push_inst(compiler, MFLO | D(dst), DR(dst));
399 #else
400 			FAIL_IF(push_inst(compiler, SELECT_OP(DMULT, MULT) | S(src1) | T(src2), MOVABLE_INS));
401 			return push_inst(compiler, MFLO | D(dst), DR(dst));
402 #endif
403 		}
404 		FAIL_IF(push_inst(compiler, SELECT_OP(DMULT, MULT) | S(src1) | T(src2), MOVABLE_INS));
405 		FAIL_IF(push_inst(compiler, MFHI | DA(ULESS_FLAG), ULESS_FLAG));
406 		FAIL_IF(push_inst(compiler, MFLO | D(dst), DR(dst)));
407 		FAIL_IF(push_inst(compiler, SELECT_OP(DSRA32, SRA) | T(dst) | DA(UGREATER_FLAG) | SH_IMM(31), UGREATER_FLAG));
408 		return push_inst(compiler, SELECT_OP(DSUBU, SUBU) | SA(ULESS_FLAG) | TA(UGREATER_FLAG) | DA(OVERFLOW_FLAG), OVERFLOW_FLAG);
409 
410 	case SLJIT_AND:
411 		EMIT_LOGICAL(ANDI, AND);
412 		return SLJIT_SUCCESS;
413 
414 	case SLJIT_OR:
415 		EMIT_LOGICAL(ORI, OR);
416 		return SLJIT_SUCCESS;
417 
418 	case SLJIT_XOR:
419 		EMIT_LOGICAL(XORI, XOR);
420 		return SLJIT_SUCCESS;
421 
422 	case SLJIT_SHL:
423 		EMIT_SHIFT(DSLL, DSLL32, SLL, DSLLV, SLLV);
424 		return SLJIT_SUCCESS;
425 
426 	case SLJIT_LSHR:
427 		EMIT_SHIFT(DSRL, DSRL32, SRL, DSRLV, SRLV);
428 		return SLJIT_SUCCESS;
429 
430 	case SLJIT_ASHR:
431 		EMIT_SHIFT(DSRA, DSRA32, SRA, DSRAV, SRAV);
432 		return SLJIT_SUCCESS;
433 	}
434 
435 	SLJIT_ASSERT_STOP();
436 	return SLJIT_SUCCESS;
437 }
438 
emit_const(struct sljit_compiler * compiler,sljit_si dst,sljit_sw init_value)439 static SLJIT_INLINE sljit_si emit_const(struct sljit_compiler *compiler, sljit_si dst, sljit_sw init_value)
440 {
441 	FAIL_IF(push_inst(compiler, LUI | T(dst) | IMM(init_value >> 48), DR(dst)));
442 	FAIL_IF(push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value >> 32), DR(dst)));
443 	FAIL_IF(push_inst(compiler, DSLL | T(dst) | D(dst) | SH_IMM(16), DR(dst)));
444 	FAIL_IF(push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value >> 16), DR(dst)));
445 	FAIL_IF(push_inst(compiler, DSLL | T(dst) | D(dst) | SH_IMM(16), DR(dst)));
446 	return push_inst(compiler, ORI | S(dst) | T(dst) | IMM(init_value), DR(dst));
447 }
448 
sljit_set_jump_addr(sljit_uw addr,sljit_uw new_addr)449 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_addr)
450 {
451 	sljit_ins *inst = (sljit_ins*)addr;
452 
453 	inst[0] = (inst[0] & 0xffff0000) | ((new_addr >> 48) & 0xffff);
454 	inst[1] = (inst[1] & 0xffff0000) | ((new_addr >> 32) & 0xffff);
455 	inst[3] = (inst[3] & 0xffff0000) | ((new_addr >> 16) & 0xffff);
456 	inst[5] = (inst[5] & 0xffff0000) | (new_addr & 0xffff);
457 	SLJIT_CACHE_FLUSH(inst, inst + 6);
458 }
459 
sljit_set_const(sljit_uw addr,sljit_sw new_constant)460 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_const(sljit_uw addr, sljit_sw new_constant)
461 {
462 	sljit_ins *inst = (sljit_ins*)addr;
463 
464 	inst[0] = (inst[0] & 0xffff0000) | ((new_constant >> 48) & 0xffff);
465 	inst[1] = (inst[1] & 0xffff0000) | ((new_constant >> 32) & 0xffff);
466 	inst[3] = (inst[3] & 0xffff0000) | ((new_constant >> 16) & 0xffff);
467 	inst[5] = (inst[5] & 0xffff0000) | (new_constant & 0xffff);
468 	SLJIT_CACHE_FLUSH(inst, inst + 6);
469 }
470