dist2/src/sljit/sljitNativeX86_32.c - nest-cam/4320010/pcre2 - Git at Google

 /*
  *    Stack-less Just-In-Time compiler
  *
  *    Copyright 2009-2012 Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without modification, are
  * permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright notice, this list of
  *      conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright notice, this list
  *      of conditions and the following disclaimer in the documentation and/or other materials
  *      provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 /* x86 32-bit arch dependent functions. */

 static sljit_si emit_do_imm(struct sljit_compiler *compiler, sljit_ub opcode, sljit_sw imm)
 {
 	sljit_ub *inst;

 	inst = (sljit_ub*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_sw));
 	FAIL_IF(!inst);
 	INC_SIZE(1 + sizeof(sljit_sw));
 	*inst++ = opcode;
 	*(sljit_sw*)inst = imm;
 	return SLJIT_SUCCESS;
 }

 static sljit_ub* generate_far_jump_code(struct sljit_jump *jump, sljit_ub *code_ptr, sljit_si type)
 {
 	if (type == SLJIT_JUMP) {
 		*code_ptr++ = JMP_i32;
 		jump->addr++;
 	}
 	else if (type >= SLJIT_FAST_CALL) {
 		*code_ptr++ = CALL_i32;
 		jump->addr++;
 	}
 	else {
 		*code_ptr++ = GROUP_0F;
 		*code_ptr++ = get_jump_code(type);
 		jump->addr += 2;
 	}

 	if (jump->flags & JUMP_LABEL)
 		jump->flags |= PATCH_MW;
 	else
 		*(sljit_sw*)code_ptr = jump->u.target - (jump->addr + 4);
 	code_ptr += 4;

 	return code_ptr;
 }

 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_enter(struct sljit_compiler *compiler,
 	sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
 	sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
 {
 	sljit_si size;
 	sljit_ub *inst;

 	CHECK_ERROR();
 	CHECK(check_sljit_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size));
 	set_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);

 	compiler->args = args;
 	compiler->flags_saved = 0;

 	size = 1 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3);
 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
 	size += (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0);
 #else
 	size += (args > 0 ? (2 + args * 3) : 0);
 #endif
 	inst = (sljit_ub*)ensure_buf(compiler, 1 + size);
 	FAIL_IF(!inst);

 	INC_SIZE(size);
 	PUSH_REG(reg_map[TMP_REG1]);
 #if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
 	if (args > 0) {
 		*inst++ = MOV_r_rm;
 		*inst++ = MOD_REG | (reg_map[TMP_REG1] << 3) | 0x4 /* esp */;
 	}
 #endif
 	if (saveds > 2 || scratches > 7)
 		PUSH_REG(reg_map[SLJIT_S2]);
 	if (saveds > 1 || scratches > 8)
 		PUSH_REG(reg_map[SLJIT_S1]);
 	if (saveds > 0 || scratches > 9)
 		PUSH_REG(reg_map[SLJIT_S0]);

 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
 	if (args > 0) {
 		*inst++ = MOV_r_rm;
 		*inst++ = MOD_REG | (reg_map[SLJIT_S0] << 3) | reg_map[SLJIT_R2];
 	}
 	if (args > 1) {
 		*inst++ = MOV_r_rm;
 		*inst++ = MOD_REG | (reg_map[SLJIT_S1] << 3) | reg_map[SLJIT_R1];
 	}
 	if (args > 2) {
 		*inst++ = MOV_r_rm;
 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | 0x4 /* esp */;
 		*inst++ = 0x24;
 		*inst++ = sizeof(sljit_sw) * (3 + 2); /* saveds >= 3 as well. */
 	}
 #else
 	if (args > 0) {
 		*inst++ = MOV_r_rm;
 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_S0] << 3) | reg_map[TMP_REG1];
 		*inst++ = sizeof(sljit_sw) * 2;
 	}
 	if (args > 1) {
 		*inst++ = MOV_r_rm;
 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_S1] << 3) | reg_map[TMP_REG1];
 		*inst++ = sizeof(sljit_sw) * 3;
 	}
 	if (args > 2) {
 		*inst++ = MOV_r_rm;
 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_S2] << 3) | reg_map[TMP_REG1];
 		*inst++ = sizeof(sljit_sw) * 4;
 	}
 #endif

 	SLJIT_COMPILE_ASSERT(SLJIT_LOCALS_OFFSET >= (2 + 4) * sizeof(sljit_uw), require_at_least_two_words);
 #if defined(__APPLE__)
 	/* Ignore pushed registers and SLJIT_LOCALS_OFFSET when computing the aligned local size. */
 	saveds = (2 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
 	local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
 #else
 	if (options & SLJIT_DOUBLE_ALIGNMENT) {
 		local_size = SLJIT_LOCALS_OFFSET + ((local_size + 7) & ~7);

 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 17);
 		FAIL_IF(!inst);

 		INC_SIZE(17);
 		inst[0] = MOV_r_rm;
 		inst[1] = MOD_REG | (reg_map[TMP_REG1] << 3) | reg_map[SLJIT_SP];
 		inst[2] = GROUP_F7;
 		inst[3] = MOD_REG | (0 << 3) | reg_map[SLJIT_SP];
 		*(sljit_sw*)(inst + 4) = 0x4;
 		inst[8] = JNE_i8;
 		inst[9] = 6;
 		inst[10] = GROUP_BINARY_81;
 		inst[11] = MOD_REG | (5 << 3) | reg_map[SLJIT_SP];
 		*(sljit_sw*)(inst + 12) = 0x4;
 		inst[16] = PUSH_r + reg_map[TMP_REG1];
 	}
 	else
 		local_size = SLJIT_LOCALS_OFFSET + ((local_size + 3) & ~3);
 #endif

 	compiler->local_size = local_size;
 #ifdef _WIN32
 	if (local_size > 1024) {
 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
 		FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size));
 #else
 		local_size -= SLJIT_LOCALS_OFFSET;
 		FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size));
 		FAIL_IF(emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32,
 			SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, SLJIT_LOCALS_OFFSET));
 #endif
 		FAIL_IF(sljit_emit_ijump(compiler, SLJIT_CALL1, SLJIT_IMM, SLJIT_FUNC_OFFSET(sljit_grow_stack)));
 	}
 #endif

 	SLJIT_ASSERT(local_size > 0);
 	return emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32,
 		SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size);
 }

 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_set_context(struct sljit_compiler *compiler,
 	sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
 	sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
 {
 	CHECK_ERROR();
 	CHECK(check_sljit_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size));
 	set_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);

 	compiler->args = args;

 #if defined(__APPLE__)
 	saveds = (2 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
 	compiler->local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
 #else
 	if (options & SLJIT_DOUBLE_ALIGNMENT)
 		compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + 7) & ~7);
 	else
 		compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + 3) & ~3);
 #endif
 	return SLJIT_SUCCESS;
 }

 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_return(struct sljit_compiler *compiler, sljit_si op, sljit_si src, sljit_sw srcw)
 {
 	sljit_si size;
 	sljit_ub *inst;

 	CHECK_ERROR();
 	CHECK(check_sljit_emit_return(compiler, op, src, srcw));
 	SLJIT_ASSERT(compiler->args >= 0);

 	compiler->flags_saved = 0;
 	FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));

 	SLJIT_ASSERT(compiler->local_size > 0);
 	FAIL_IF(emit_cum_binary(compiler, ADD_r_rm, ADD_rm_r, ADD, ADD_EAX_i32,
 		SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));

 #if !defined(__APPLE__)
 	if (compiler->options & SLJIT_DOUBLE_ALIGNMENT) {
 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 3);
 		FAIL_IF(!inst);

 		INC_SIZE(3);
 		inst[0] = MOV_r_rm;
 		inst[1] = (reg_map[SLJIT_SP] << 3) | 0x4 /* SIB */;
 		inst[2] = (4 << 3) | reg_map[SLJIT_SP];
 	}
 #endif

 	size = 2 + (compiler->scratches > 7 ? (compiler->scratches - 7) : 0) +
 		(compiler->saveds <= 3 ? compiler->saveds : 3);
 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
 	if (compiler->args > 2)
 		size += 2;
 #else
 	if (compiler->args > 0)
 		size += 2;
 #endif
 	inst = (sljit_ub*)ensure_buf(compiler, 1 + size);
 	FAIL_IF(!inst);

 	INC_SIZE(size);

 	if (compiler->saveds > 0 || compiler->scratches > 9)
 		POP_REG(reg_map[SLJIT_S0]);
 	if (compiler->saveds > 1 || compiler->scratches > 8)
 		POP_REG(reg_map[SLJIT_S1]);
 	if (compiler->saveds > 2 || compiler->scratches > 7)
 		POP_REG(reg_map[SLJIT_S2]);
 	POP_REG(reg_map[TMP_REG1]);
 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
 	if (compiler->args > 2)
 		RET_I16(sizeof(sljit_sw));
 	else
 		RET();
 #else
 	RET();
 #endif

 	return SLJIT_SUCCESS;
 }

 /* --------------------------------------------------------------------- */
 /*  Operators                                                            */
 /* --------------------------------------------------------------------- */

 /* Size contains the flags as well. */
 static sljit_ub* emit_x86_instruction(struct sljit_compiler *compiler, sljit_si size,
 	/* The register or immediate operand. */
 	sljit_si a, sljit_sw imma,
 	/* The general operand (not immediate). */
 	sljit_si b, sljit_sw immb)
 {
 	sljit_ub *inst;
 	sljit_ub *buf_ptr;
 	sljit_si flags = size & ~0xf;
 	sljit_si inst_size;

 	/* Both cannot be switched on. */
 	SLJIT_ASSERT((flags & (EX86_BIN_INS | EX86_SHIFT_INS)) != (EX86_BIN_INS | EX86_SHIFT_INS));
 	/* Size flags not allowed for typed instructions. */
 	SLJIT_ASSERT(!(flags & (EX86_BIN_INS | EX86_SHIFT_INS)) || (flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) == 0);
 	/* Both size flags cannot be switched on. */
 	SLJIT_ASSERT((flags & (EX86_BYTE_ARG | EX86_HALF_ARG)) != (EX86_BYTE_ARG | EX86_HALF_ARG));
 	/* SSE2 and immediate is not possible. */
 	SLJIT_ASSERT(!(a & SLJIT_IMM) || !(flags & EX86_SSE2));
 	SLJIT_ASSERT((flags & (EX86_PREF_F2 | EX86_PREF_F3)) != (EX86_PREF_F2 | EX86_PREF_F3)
 		&& (flags & (EX86_PREF_F2 | EX86_PREF_66)) != (EX86_PREF_F2 | EX86_PREF_66)
 		&& (flags & (EX86_PREF_F3 | EX86_PREF_66)) != (EX86_PREF_F3 | EX86_PREF_66));

 	size &= 0xf;
 	inst_size = size;

 	if (flags & (EX86_PREF_F2 | EX86_PREF_F3))
 		inst_size++;
 	if (flags & EX86_PREF_66)
 		inst_size++;

 	/* Calculate size of b. */
 	inst_size += 1; /* mod r/m byte. */
 	if (b & SLJIT_MEM) {
 		if ((b & REG_MASK) == SLJIT_UNUSED)
 			inst_size += sizeof(sljit_sw);
 		else if (immb != 0 && !(b & OFFS_REG_MASK)) {
 			/* Immediate operand. */
 			if (immb <= 127 && immb >= -128)
 				inst_size += sizeof(sljit_sb);
 			else
 				inst_size += sizeof(sljit_sw);
 		}

 		if ((b & REG_MASK) == SLJIT_SP && !(b & OFFS_REG_MASK))
 			b |= TO_OFFS_REG(SLJIT_SP);

 		if ((b & OFFS_REG_MASK) != SLJIT_UNUSED)
 			inst_size += 1; /* SIB byte. */
 	}

 	/* Calculate size of a. */
 	if (a & SLJIT_IMM) {
 		if (flags & EX86_BIN_INS) {
 			if (imma <= 127 && imma >= -128) {
 				inst_size += 1;
 				flags |= EX86_BYTE_ARG;
 			} else
 				inst_size += 4;
 		}
 		else if (flags & EX86_SHIFT_INS) {
 			imma &= 0x1f;
 			if (imma != 1) {
 				inst_size ++;
 				flags |= EX86_BYTE_ARG;
 			}
 		} else if (flags & EX86_BYTE_ARG)
 			inst_size++;
 		else if (flags & EX86_HALF_ARG)
 			inst_size += sizeof(short);
 		else
 			inst_size += sizeof(sljit_sw);
 	}
 	else
 		SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);

 	inst = (sljit_ub*)ensure_buf(compiler, 1 + inst_size);
 	PTR_FAIL_IF(!inst);

 	/* Encoding the byte. */
 	INC_SIZE(inst_size);
 	if (flags & EX86_PREF_F2)
 		*inst++ = 0xf2;
 	if (flags & EX86_PREF_F3)
 		*inst++ = 0xf3;
 	if (flags & EX86_PREF_66)
 		*inst++ = 0x66;

 	buf_ptr = inst + size;

 	/* Encode mod/rm byte. */
 	if (!(flags & EX86_SHIFT_INS)) {
 		if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
 			*inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81;

 		if ((a & SLJIT_IMM) || (a == 0))
 			*buf_ptr = 0;
 		else if (!(flags & EX86_SSE2_OP1))
 			*buf_ptr = reg_map[a] << 3;
 		else
 			*buf_ptr = a << 3;
 	}
 	else {
 		if (a & SLJIT_IMM) {
 			if (imma == 1)
 				*inst = GROUP_SHIFT_1;
 			else
 				*inst = GROUP_SHIFT_N;
 		} else
 			*inst = GROUP_SHIFT_CL;
 		*buf_ptr = 0;
 	}

 	if (!(b & SLJIT_MEM))
 		*buf_ptr++ |= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_map[b] : b);
 	else if ((b & REG_MASK) != SLJIT_UNUSED) {
 		if ((b & OFFS_REG_MASK) == SLJIT_UNUSED || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
 			if (immb != 0) {
 				if (immb <= 127 && immb >= -128)
 					*buf_ptr |= 0x40;
 				else
 					*buf_ptr |= 0x80;
 			}

 			if ((b & OFFS_REG_MASK) == SLJIT_UNUSED)
 				*buf_ptr++ |= reg_map[b & REG_MASK];
 			else {
 				*buf_ptr++ |= 0x04;
 				*buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3);
 			}

 			if (immb != 0) {
 				if (immb <= 127 && immb >= -128)
 					*buf_ptr++ = immb; /* 8 bit displacement. */
 				else {
 					*(sljit_sw*)buf_ptr = immb; /* 32 bit displacement. */
 					buf_ptr += sizeof(sljit_sw);
 				}
 			}
 		}
 		else {
 			*buf_ptr++ |= 0x04;
 			*buf_ptr++ = reg_map[b & REG_MASK] | (reg_map[OFFS_REG(b)] << 3) | (immb << 6);
 		}
 	}
 	else {
 		*buf_ptr++ |= 0x05;
 		*(sljit_sw*)buf_ptr = immb; /* 32 bit displacement. */
 		buf_ptr += sizeof(sljit_sw);
 	}

 	if (a & SLJIT_IMM) {
 		if (flags & EX86_BYTE_ARG)
 			*buf_ptr = imma;
 		else if (flags & EX86_HALF_ARG)
 			*(short*)buf_ptr = imma;
 		else if (!(flags & EX86_SHIFT_INS))
 			*(sljit_sw*)buf_ptr = imma;
 	}

 	return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
 }

 /* --------------------------------------------------------------------- */
 /*  Call / return instructions                                           */
 /* --------------------------------------------------------------------- */

 static SLJIT_INLINE sljit_si call_with_args(struct sljit_compiler *compiler, sljit_si type)
 {
 	sljit_ub *inst;

 #if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
 	inst = (sljit_ub*)ensure_buf(compiler, type >= SLJIT_CALL3 ? 1 + 2 + 1 : 1 + 2);
 	FAIL_IF(!inst);
 	INC_SIZE(type >= SLJIT_CALL3 ? 2 + 1 : 2);

 	if (type >= SLJIT_CALL3)
 		PUSH_REG(reg_map[SLJIT_R2]);
 	*inst++ = MOV_r_rm;
 	*inst++ = MOD_REG | (reg_map[SLJIT_R2] << 3) | reg_map[SLJIT_R0];
 #else
 	inst = (sljit_ub*)ensure_buf(compiler, 1 + 4 * (type - SLJIT_CALL0));
 	FAIL_IF(!inst);
 	INC_SIZE(4 * (type - SLJIT_CALL0));

 	*inst++ = MOV_rm_r;
 	*inst++ = MOD_DISP8 | (reg_map[SLJIT_R0] << 3) | 0x4 /* SIB */;
 	*inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP];
 	*inst++ = 0;
 	if (type >= SLJIT_CALL2) {
 		*inst++ = MOV_rm_r;
 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_R1] << 3) | 0x4 /* SIB */;
 		*inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP];
 		*inst++ = sizeof(sljit_sw);
 	}
 	if (type >= SLJIT_CALL3) {
 		*inst++ = MOV_rm_r;
 		*inst++ = MOD_DISP8 | (reg_map[SLJIT_R2] << 3) | 0x4 /* SIB */;
 		*inst++ = (0x4 /* none*/ << 3) | reg_map[SLJIT_SP];
 		*inst++ = 2 * sizeof(sljit_sw);
 	}
 #endif
 	return SLJIT_SUCCESS;
 }

 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw)
 {
 	sljit_ub *inst;

 	CHECK_ERROR();
 	CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw));
 	ADJUST_LOCAL_OFFSET(dst, dstw);

 	CHECK_EXTRA_REGS(dst, dstw, (void)0);

 	/* For UNUSED dst. Uncommon, but possible. */
 	if (dst == SLJIT_UNUSED)
 		dst = TMP_REG1;

 	if (FAST_IS_REG(dst)) {
 		/* Unused dest is possible here. */
 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 1);
 		FAIL_IF(!inst);

 		INC_SIZE(1);
 		POP_REG(reg_map[dst]);
 		return SLJIT_SUCCESS;
 	}

 	/* Memory. */
 	inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
 	FAIL_IF(!inst);
 	*inst++ = POP_rm;
 	return SLJIT_SUCCESS;
 }

 SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_si src, sljit_sw srcw)
 {
 	sljit_ub *inst;

 	CHECK_ERROR();
 	CHECK(check_sljit_emit_fast_return(compiler, src, srcw));
 	ADJUST_LOCAL_OFFSET(src, srcw);

 	CHECK_EXTRA_REGS(src, srcw, (void)0);

 	if (FAST_IS_REG(src)) {
 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 1 + 1);
 		FAIL_IF(!inst);

 		INC_SIZE(1 + 1);
 		PUSH_REG(reg_map[src]);
 	}
 	else if (src & SLJIT_MEM) {
 		inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
 		FAIL_IF(!inst);
 		*inst++ = GROUP_FF;
 		*inst |= PUSH_rm;

 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 1);
 		FAIL_IF(!inst);
 		INC_SIZE(1);
 	}
 	else {
 		/* SLJIT_IMM. */
 		inst = (sljit_ub*)ensure_buf(compiler, 1 + 5 + 1);
 		FAIL_IF(!inst);

 		INC_SIZE(5 + 1);
 		*inst++ = PUSH_i32;
 		*(sljit_sw*)inst = srcw;
 		inst += sizeof(sljit_sw);
 	}

 	RET();
 	return SLJIT_SUCCESS;
 }
	/*
	* Stack-less Just-In-Time compiler
	*
	* Copyright 2009-2012 Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without modification, are
	* permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice, this list of
	* conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright notice, this list
	* of conditions and the following disclaimer in the documentation and/or other materials
	* provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
	* SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
	* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
	* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	/* x86 32-bit arch dependent functions. */

	static sljit_si emit_do_imm(struct sljit_compiler *compiler, sljit_ub opcode, sljit_sw imm)
	{
	sljit_ub *inst;

	inst = (sljit_ub*)ensure_buf(compiler, 1 + 1 + sizeof(sljit_sw));
	FAIL_IF(!inst);
	INC_SIZE(1 + sizeof(sljit_sw));
	*inst++ = opcode;
	(sljit_sw)inst = imm;
	return SLJIT_SUCCESS;
	}

	static sljit_ub* generate_far_jump_code(struct sljit_jump jump, sljit_ub code_ptr, sljit_si type)
	{
	if (type == SLJIT_JUMP) {
	*code_ptr++ = JMP_i32;
	jump->addr++;
	}
	else if (type >= SLJIT_FAST_CALL) {
	*code_ptr++ = CALL_i32;
	jump->addr++;
	}
	else {
	*code_ptr++ = GROUP_0F;
	*code_ptr++ = get_jump_code(type);
	jump->addr += 2;
	}

	if (jump->flags & JUMP_LABEL)
	jump->flags \|= PATCH_MW;
	else
	(sljit_sw)code_ptr = jump->u.target - (jump->addr + 4);
	code_ptr += 4;

	return code_ptr;
	}

	SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_enter(struct sljit_compiler *compiler,
	sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
	sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
	{
	sljit_si size;
	sljit_ub *inst;

	CHECK_ERROR();
	CHECK(check_sljit_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size));
	set_emit_enter(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);

	compiler->args = args;
	compiler->flags_saved = 0;

	size = 1 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3);
	#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	size += (args > 0 ? (args * 2) : 0) + (args > 2 ? 2 : 0);
	#else
	size += (args > 0 ? (2 + args * 3) : 0);
	#endif
	inst = (sljit_ub*)ensure_buf(compiler, 1 + size);
	FAIL_IF(!inst);

	INC_SIZE(size);
	PUSH_REG(reg_map[TMP_REG1]);
	#if !(defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (args > 0) {
	*inst++ = MOV_r_rm;
	inst++ = MOD_REG \| (reg_map[TMP_REG1] << 3) \| 0x4 / esp */;
	}
	#endif
	if (saveds > 2 \|\| scratches > 7)
	PUSH_REG(reg_map[SLJIT_S2]);
	if (saveds > 1 \|\| scratches > 8)
	PUSH_REG(reg_map[SLJIT_S1]);
	if (saveds > 0 \|\| scratches > 9)
	PUSH_REG(reg_map[SLJIT_S0]);

	#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (args > 0) {
	*inst++ = MOV_r_rm;
	*inst++ = MOD_REG \| (reg_map[SLJIT_S0] << 3) \| reg_map[SLJIT_R2];
	}
	if (args > 1) {
	*inst++ = MOV_r_rm;
	*inst++ = MOD_REG \| (reg_map[SLJIT_S1] << 3) \| reg_map[SLJIT_R1];
	}
	if (args > 2) {
	*inst++ = MOV_r_rm;
	inst++ = MOD_DISP8 \| (reg_map[SLJIT_S2] << 3) \| 0x4 / esp */;
	*inst++ = 0x24;
	inst++ = sizeof(sljit_sw) (3 + 2); /* saveds >= 3 as well. */
	}
	#else
	if (args > 0) {
	*inst++ = MOV_r_rm;
	*inst++ = MOD_DISP8 \| (reg_map[SLJIT_S0] << 3) \| reg_map[TMP_REG1];
	inst++ = sizeof(sljit_sw) 2;
	}
	if (args > 1) {
	*inst++ = MOV_r_rm;
	*inst++ = MOD_DISP8 \| (reg_map[SLJIT_S1] << 3) \| reg_map[TMP_REG1];
	inst++ = sizeof(sljit_sw) 3;
	}
	if (args > 2) {
	*inst++ = MOV_r_rm;
	*inst++ = MOD_DISP8 \| (reg_map[SLJIT_S2] << 3) \| reg_map[TMP_REG1];
	inst++ = sizeof(sljit_sw) 4;
	}
	#endif

	SLJIT_COMPILE_ASSERT(SLJIT_LOCALS_OFFSET >= (2 + 4) * sizeof(sljit_uw), require_at_least_two_words);
	#if defined(__APPLE__)
	/* Ignore pushed registers and SLJIT_LOCALS_OFFSET when computing the aligned local size. */
	saveds = (2 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
	local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
	#else
	if (options & SLJIT_DOUBLE_ALIGNMENT) {
	local_size = SLJIT_LOCALS_OFFSET + ((local_size + 7) & ~7);

	inst = (sljit_ub*)ensure_buf(compiler, 1 + 17);
	FAIL_IF(!inst);

	INC_SIZE(17);
	inst[0] = MOV_r_rm;
	inst[1] = MOD_REG \| (reg_map[TMP_REG1] << 3) \| reg_map[SLJIT_SP];
	inst[2] = GROUP_F7;
	inst[3] = MOD_REG \| (0 << 3) \| reg_map[SLJIT_SP];
	(sljit_sw)(inst + 4) = 0x4;
	inst[8] = JNE_i8;
	inst[9] = 6;
	inst[10] = GROUP_BINARY_81;
	inst[11] = MOD_REG \| (5 << 3) \| reg_map[SLJIT_SP];
	(sljit_sw)(inst + 12) = 0x4;
	inst[16] = PUSH_r + reg_map[TMP_REG1];
	}
	else
	local_size = SLJIT_LOCALS_OFFSET + ((local_size + 3) & ~3);
	#endif

	compiler->local_size = local_size;
	#ifdef _WIN32
	if (local_size > 1024) {
	#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size));
	#else
	local_size -= SLJIT_LOCALS_OFFSET;
	FAIL_IF(emit_do_imm(compiler, MOV_r_i32 + reg_map[SLJIT_R0], local_size));
	FAIL_IF(emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32,
	SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, SLJIT_LOCALS_OFFSET));
	#endif
	FAIL_IF(sljit_emit_ijump(compiler, SLJIT_CALL1, SLJIT_IMM, SLJIT_FUNC_OFFSET(sljit_grow_stack)));
	}
	#endif

	SLJIT_ASSERT(local_size > 0);
	return emit_non_cum_binary(compiler, SUB_r_rm, SUB_rm_r, SUB, SUB_EAX_i32,
	SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, local_size);
	}

	SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_set_context(struct sljit_compiler *compiler,
	sljit_si options, sljit_si args, sljit_si scratches, sljit_si saveds,
	sljit_si fscratches, sljit_si fsaveds, sljit_si local_size)
	{
	CHECK_ERROR();
	CHECK(check_sljit_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size));
	set_set_context(compiler, options, args, scratches, saveds, fscratches, fsaveds, local_size);

	compiler->args = args;

	#if defined(__APPLE__)
	saveds = (2 + (scratches > 7 ? (scratches - 7) : 0) + (saveds <= 3 ? saveds : 3)) * sizeof(sljit_uw);
	compiler->local_size = ((SLJIT_LOCALS_OFFSET + saveds + local_size + 15) & ~15) - saveds;
	#else
	if (options & SLJIT_DOUBLE_ALIGNMENT)
	compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + 7) & ~7);
	else
	compiler->local_size = SLJIT_LOCALS_OFFSET + ((local_size + 3) & ~3);
	#endif
	return SLJIT_SUCCESS;
	}

	SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_return(struct sljit_compiler *compiler, sljit_si op, sljit_si src, sljit_sw srcw)
	{
	sljit_si size;
	sljit_ub *inst;

	CHECK_ERROR();
	CHECK(check_sljit_emit_return(compiler, op, src, srcw));
	SLJIT_ASSERT(compiler->args >= 0);

	compiler->flags_saved = 0;
	FAIL_IF(emit_mov_before_return(compiler, op, src, srcw));

	SLJIT_ASSERT(compiler->local_size > 0);
	FAIL_IF(emit_cum_binary(compiler, ADD_r_rm, ADD_rm_r, ADD, ADD_EAX_i32,
	SLJIT_SP, 0, SLJIT_SP, 0, SLJIT_IMM, compiler->local_size));

	#if !defined(__APPLE__)
	if (compiler->options & SLJIT_DOUBLE_ALIGNMENT) {
	inst = (sljit_ub*)ensure_buf(compiler, 1 + 3);
	FAIL_IF(!inst);

	INC_SIZE(3);
	inst[0] = MOV_r_rm;
	inst[1] = (reg_map[SLJIT_SP] << 3) \| 0x4 /* SIB */;
	inst[2] = (4 << 3) \| reg_map[SLJIT_SP];
	}
	#endif

	size = 2 + (compiler->scratches > 7 ? (compiler->scratches - 7) : 0) +
	(compiler->saveds <= 3 ? compiler->saveds : 3);
	#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (compiler->args > 2)
	size += 2;
	#else
	if (compiler->args > 0)
	size += 2;
	#endif
	inst = (sljit_ub*)ensure_buf(compiler, 1 + size);
	FAIL_IF(!inst);

	INC_SIZE(size);

	if (compiler->saveds > 0 \|\| compiler->scratches > 9)
	POP_REG(reg_map[SLJIT_S0]);
	if (compiler->saveds > 1 \|\| compiler->scratches > 8)
	POP_REG(reg_map[SLJIT_S1]);
	if (compiler->saveds > 2 \|\| compiler->scratches > 7)
	POP_REG(reg_map[SLJIT_S2]);
	POP_REG(reg_map[TMP_REG1]);
	#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	if (compiler->args > 2)
	RET_I16(sizeof(sljit_sw));
	else
	RET();
	#else
	RET();
	#endif

	return SLJIT_SUCCESS;
	}

	/* --------------------------------------------------------------------- */
	/* Operators */
	/* --------------------------------------------------------------------- */

	/* Size contains the flags as well. */
	static sljit_ub* emit_x86_instruction(struct sljit_compiler *compiler, sljit_si size,
	/* The register or immediate operand. */
	sljit_si a, sljit_sw imma,
	/* The general operand (not immediate). */
	sljit_si b, sljit_sw immb)
	{
	sljit_ub *inst;
	sljit_ub *buf_ptr;
	sljit_si flags = size & ~0xf;
	sljit_si inst_size;

	/* Both cannot be switched on. */
	SLJIT_ASSERT((flags & (EX86_BIN_INS \| EX86_SHIFT_INS)) != (EX86_BIN_INS \| EX86_SHIFT_INS));
	/* Size flags not allowed for typed instructions. */
	SLJIT_ASSERT(!(flags & (EX86_BIN_INS \| EX86_SHIFT_INS)) \|\| (flags & (EX86_BYTE_ARG \| EX86_HALF_ARG)) == 0);
	/* Both size flags cannot be switched on. */
	SLJIT_ASSERT((flags & (EX86_BYTE_ARG \| EX86_HALF_ARG)) != (EX86_BYTE_ARG \| EX86_HALF_ARG));
	/* SSE2 and immediate is not possible. */
	SLJIT_ASSERT(!(a & SLJIT_IMM) \|\| !(flags & EX86_SSE2));
	SLJIT_ASSERT((flags & (EX86_PREF_F2 \| EX86_PREF_F3)) != (EX86_PREF_F2 \| EX86_PREF_F3)
	&& (flags & (EX86_PREF_F2 \| EX86_PREF_66)) != (EX86_PREF_F2 \| EX86_PREF_66)
	&& (flags & (EX86_PREF_F3 \| EX86_PREF_66)) != (EX86_PREF_F3 \| EX86_PREF_66));

	size &= 0xf;
	inst_size = size;

	if (flags & (EX86_PREF_F2 \| EX86_PREF_F3))
	inst_size++;
	if (flags & EX86_PREF_66)
	inst_size++;

	/* Calculate size of b. */
	inst_size += 1; /* mod r/m byte. */
	if (b & SLJIT_MEM) {
	if ((b & REG_MASK) == SLJIT_UNUSED)
	inst_size += sizeof(sljit_sw);
	else if (immb != 0 && !(b & OFFS_REG_MASK)) {
	/* Immediate operand. */
	if (immb <= 127 && immb >= -128)
	inst_size += sizeof(sljit_sb);
	else
	inst_size += sizeof(sljit_sw);
	}

	if ((b & REG_MASK) == SLJIT_SP && !(b & OFFS_REG_MASK))
	b \|= TO_OFFS_REG(SLJIT_SP);

	if ((b & OFFS_REG_MASK) != SLJIT_UNUSED)
	inst_size += 1; /* SIB byte. */
	}

	/* Calculate size of a. */
	if (a & SLJIT_IMM) {
	if (flags & EX86_BIN_INS) {
	if (imma <= 127 && imma >= -128) {
	inst_size += 1;
	flags \|= EX86_BYTE_ARG;
	} else
	inst_size += 4;
	}
	else if (flags & EX86_SHIFT_INS) {
	imma &= 0x1f;
	if (imma != 1) {
	inst_size ++;
	flags \|= EX86_BYTE_ARG;
	}
	} else if (flags & EX86_BYTE_ARG)
	inst_size++;
	else if (flags & EX86_HALF_ARG)
	inst_size += sizeof(short);
	else
	inst_size += sizeof(sljit_sw);
	}
	else
	SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) \|\| a == SLJIT_PREF_SHIFT_REG);

	inst = (sljit_ub*)ensure_buf(compiler, 1 + inst_size);
	PTR_FAIL_IF(!inst);

	/* Encoding the byte. */
	INC_SIZE(inst_size);
	if (flags & EX86_PREF_F2)
	*inst++ = 0xf2;
	if (flags & EX86_PREF_F3)
	*inst++ = 0xf3;
	if (flags & EX86_PREF_66)
	*inst++ = 0x66;

	buf_ptr = inst + size;

	/* Encode mod/rm byte. */
	if (!(flags & EX86_SHIFT_INS)) {
	if ((flags & EX86_BIN_INS) && (a & SLJIT_IMM))
	*inst = (flags & EX86_BYTE_ARG) ? GROUP_BINARY_83 : GROUP_BINARY_81;

	if ((a & SLJIT_IMM) \|\| (a == 0))
	*buf_ptr = 0;
	else if (!(flags & EX86_SSE2_OP1))
	*buf_ptr = reg_map[a] << 3;
	else
	*buf_ptr = a << 3;
	}
	else {
	if (a & SLJIT_IMM) {
	if (imma == 1)
	*inst = GROUP_SHIFT_1;
	else
	*inst = GROUP_SHIFT_N;
	} else
	*inst = GROUP_SHIFT_CL;
	*buf_ptr = 0;
	}

	if (!(b & SLJIT_MEM))
	*buf_ptr++ \|= MOD_REG + ((!(flags & EX86_SSE2_OP2)) ? reg_map[b] : b);
	else if ((b & REG_MASK) != SLJIT_UNUSED) {
	if ((b & OFFS_REG_MASK) == SLJIT_UNUSED \|\| (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
	if (immb != 0) {
	if (immb <= 127 && immb >= -128)
	*buf_ptr \|= 0x40;
	else
	*buf_ptr \|= 0x80;
	}

	if ((b & OFFS_REG_MASK) == SLJIT_UNUSED)
	*buf_ptr++ \|= reg_map[b & REG_MASK];
	else {
	*buf_ptr++ \|= 0x04;
	*buf_ptr++ = reg_map[b & REG_MASK] \| (reg_map[OFFS_REG(b)] << 3);
	}

	if (immb != 0) {
	if (immb <= 127 && immb >= -128)
	buf_ptr++ = immb; / 8 bit displacement. */
	else {
	(sljit_sw)buf_ptr = immb; /* 32 bit displacement. */
	buf_ptr += sizeof(sljit_sw);
	}
	}
	}
	else {
	*buf_ptr++ \|= 0x04;
	*buf_ptr++ = reg_map[b & REG_MASK] \| (reg_map[OFFS_REG(b)] << 3) \| (immb << 6);
	}
	}
	else {
	*buf_ptr++ \|= 0x05;
	(sljit_sw)buf_ptr = immb; /* 32 bit displacement. */
	buf_ptr += sizeof(sljit_sw);
	}

	if (a & SLJIT_IMM) {
	if (flags & EX86_BYTE_ARG)
	*buf_ptr = imma;
	else if (flags & EX86_HALF_ARG)
	(short)buf_ptr = imma;
	else if (!(flags & EX86_SHIFT_INS))
	(sljit_sw)buf_ptr = imma;
	}

	return !(flags & EX86_SHIFT_INS) ? inst : (inst + 1);
	}

	/* --------------------------------------------------------------------- */
	/* Call / return instructions */
	/* --------------------------------------------------------------------- */

	static SLJIT_INLINE sljit_si call_with_args(struct sljit_compiler *compiler, sljit_si type)
	{
	sljit_ub *inst;

	#if (defined SLJIT_X86_32_FASTCALL && SLJIT_X86_32_FASTCALL)
	inst = (sljit_ub*)ensure_buf(compiler, type >= SLJIT_CALL3 ? 1 + 2 + 1 : 1 + 2);
	FAIL_IF(!inst);
	INC_SIZE(type >= SLJIT_CALL3 ? 2 + 1 : 2);

	if (type >= SLJIT_CALL3)
	PUSH_REG(reg_map[SLJIT_R2]);
	*inst++ = MOV_r_rm;
	*inst++ = MOD_REG \| (reg_map[SLJIT_R2] << 3) \| reg_map[SLJIT_R0];
	#else
	inst = (sljit_ub)ensure_buf(compiler, 1 + 4 (type - SLJIT_CALL0));
	FAIL_IF(!inst);
	INC_SIZE(4 * (type - SLJIT_CALL0));

	*inst++ = MOV_rm_r;
	inst++ = MOD_DISP8 \| (reg_map[SLJIT_R0] << 3) \| 0x4 / SIB */;
	inst++ = (0x4 / none*/ << 3) \| reg_map[SLJIT_SP];
	*inst++ = 0;
	if (type >= SLJIT_CALL2) {
	*inst++ = MOV_rm_r;
	inst++ = MOD_DISP8 \| (reg_map[SLJIT_R1] << 3) \| 0x4 / SIB */;
	inst++ = (0x4 / none*/ << 3) \| reg_map[SLJIT_SP];
	*inst++ = sizeof(sljit_sw);
	}
	if (type >= SLJIT_CALL3) {
	*inst++ = MOV_rm_r;
	inst++ = MOD_DISP8 \| (reg_map[SLJIT_R2] << 3) \| 0x4 / SIB */;
	inst++ = (0x4 / none*/ << 3) \| reg_map[SLJIT_SP];
	inst++ = 2 sizeof(sljit_sw);
	}
	#endif
	return SLJIT_SUCCESS;
	}

	SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_enter(struct sljit_compiler *compiler, sljit_si dst, sljit_sw dstw)
	{
	sljit_ub *inst;

	CHECK_ERROR();
	CHECK(check_sljit_emit_fast_enter(compiler, dst, dstw));
	ADJUST_LOCAL_OFFSET(dst, dstw);

	CHECK_EXTRA_REGS(dst, dstw, (void)0);

	/* For UNUSED dst. Uncommon, but possible. */
	if (dst == SLJIT_UNUSED)
	dst = TMP_REG1;

	if (FAST_IS_REG(dst)) {
	/* Unused dest is possible here. */
	inst = (sljit_ub*)ensure_buf(compiler, 1 + 1);
	FAIL_IF(!inst);

	INC_SIZE(1);
	POP_REG(reg_map[dst]);
	return SLJIT_SUCCESS;
	}

	/* Memory. */
	inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
	FAIL_IF(!inst);
	*inst++ = POP_rm;
	return SLJIT_SUCCESS;
	}

	SLJIT_API_FUNC_ATTRIBUTE sljit_si sljit_emit_fast_return(struct sljit_compiler *compiler, sljit_si src, sljit_sw srcw)
	{
	sljit_ub *inst;

	CHECK_ERROR();
	CHECK(check_sljit_emit_fast_return(compiler, src, srcw));
	ADJUST_LOCAL_OFFSET(src, srcw);

	CHECK_EXTRA_REGS(src, srcw, (void)0);

	if (FAST_IS_REG(src)) {
	inst = (sljit_ub*)ensure_buf(compiler, 1 + 1 + 1);
	FAIL_IF(!inst);

	INC_SIZE(1 + 1);
	PUSH_REG(reg_map[src]);
	}
	else if (src & SLJIT_MEM) {
	inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
	FAIL_IF(!inst);
	*inst++ = GROUP_FF;
	*inst \|= PUSH_rm;

	inst = (sljit_ub*)ensure_buf(compiler, 1 + 1);
	FAIL_IF(!inst);
	INC_SIZE(1);
	}
	else {
	/* SLJIT_IMM. */
	inst = (sljit_ub*)ensure_buf(compiler, 1 + 5 + 1);
	FAIL_IF(!inst);

	INC_SIZE(5 + 1);
	*inst++ = PUSH_i32;
	(sljit_sw)inst = srcw;
	inst += sizeof(sljit_sw);
	}

	RET();
	return SLJIT_SUCCESS;
	}