sljitNativeX86_64.c

Go to the documentation of this file.

/*
 *    Stack-less Just-In-Time compiler
 *
 *    Copyright 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 64-bit arch dependent functions. */
 
/* --------------------------------------------------------------------- */
/*  Operators                                                            */
/* --------------------------------------------------------------------- */
 
static sljit_s32 emit_load_imm64(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw imm)
{
    sljit_u8 *inst;
 
    inst = (sljit_u8*)ensure_buf(compiler, 1 + 2 + sizeof(sljit_sw));
    FAIL_IF(!inst);
    INC_SIZE(2 + sizeof(sljit_sw));
    inst[0] = REX_W | ((reg_map[reg] <= 7) ? 0 : REX_B);
    inst[1] = U8(MOV_r_i32 | reg_lmap[reg]);
    sljit_unaligned_store_sw(inst + 2, imm);
    return SLJIT_SUCCESS;
}
 
static sljit_s32 emit_do_imm32(struct sljit_compiler *compiler, sljit_u8 rex, sljit_u8 opcode, sljit_sw imm)
{
    sljit_u8 *inst;
    sljit_uw length = (rex ? 2 : 1) + sizeof(sljit_s32);
 
    inst = (sljit_u8*)ensure_buf(compiler, 1 + length);
    FAIL_IF(!inst);
    INC_SIZE(length);
    if (rex)
        *inst++ = rex;
    *inst++ = opcode;
    sljit_unaligned_store_s32(inst, (sljit_s32)imm);
    return SLJIT_SUCCESS;
}
 
static sljit_u8* emit_x86_instruction(struct sljit_compiler *compiler, sljit_uw size,
    /* The register or immediate operand. */
    sljit_s32 a, sljit_sw imma,
    /* The general operand (not immediate). */
    sljit_s32 b, sljit_sw immb)
{
    sljit_u8 *inst;
    sljit_u8 *buf_ptr;
    sljit_u8 rex = 0;
    sljit_u8 reg_lmap_b;
    sljit_uw flags = size;
    sljit_uw inst_size;
 
    /* The immediate operand must be 32 bit. */
    SLJIT_ASSERT(a != SLJIT_IMM || compiler->mode32 || IS_HALFWORD(imma));
    /* 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_66))
            & ((flags & (EX86_PREF_F2 | EX86_PREF_F3 | EX86_PREF_66)) - 1)) == 0);
    SLJIT_ASSERT((flags & (EX86_VEX_EXT | EX86_REX)) != EX86_VEX_EXT);
 
    size &= 0xf;
    /* The mod r/m byte is always present. */
    inst_size = size + 1;
 
    if (!compiler->mode32 && !(flags & EX86_NO_REXW))
        rex |= REX_W;
    else if (flags & EX86_REX)
        rex |= REX;
 
    if (flags & (EX86_PREF_F2 | EX86_PREF_F3 | EX86_PREF_66))
        inst_size++;
 
    /* Calculate size of b. */
    if (b & SLJIT_MEM) {
        if (!(b & OFFS_REG_MASK) && NOT_HALFWORD(immb)) {
            PTR_FAIL_IF(emit_load_imm64(compiler, TMP_REG2, immb));
            immb = 0;
            if (b & REG_MASK)
                b |= TO_OFFS_REG(TMP_REG2);
            else
                b |= TMP_REG2;
        }
 
        if (!(b & REG_MASK))
            inst_size += 1 + sizeof(sljit_s32); /* SIB byte required to avoid RIP based addressing. */
        else {
            if (immb != 0 && !(b & OFFS_REG_MASK)) {
                /* Immediate operand. */
                if (immb <= 127 && immb >= -128)
                    inst_size += sizeof(sljit_s8);
                else
                    inst_size += sizeof(sljit_s32);
            } else if (reg_lmap[b & REG_MASK] == 5) {
                /* Swap registers if possible. */
                if ((b & OFFS_REG_MASK) && (immb & 0x3) == 0 && reg_lmap[OFFS_REG(b)] != 5)
                    b = SLJIT_MEM | OFFS_REG(b) | TO_OFFS_REG(b & REG_MASK);
                else
                    inst_size += sizeof(sljit_s8);
            }
 
            if (reg_map[b & REG_MASK] >= 8)
                rex |= REX_B;
 
            if (reg_lmap[b & REG_MASK] == 4 && !(b & OFFS_REG_MASK))
                b |= TO_OFFS_REG(SLJIT_SP);
 
            if (b & OFFS_REG_MASK) {
                inst_size += 1; /* SIB byte. */
                if (reg_map[OFFS_REG(b)] >= 8)
                    rex |= REX_X;
            }
        }
    } else if (!(flags & EX86_SSE2_OP2)) {
        if (reg_map[b] >= 8)
            rex |= REX_B;
    } else if (freg_map[b] >= 8)
        rex |= REX_B;
 
    if ((flags & EX86_VEX_EXT) && (rex & 0x3)) {
        SLJIT_ASSERT(size == 2);
        size++;
        inst_size++;
    }
 
    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) {
            SLJIT_ASSERT(imma <= (compiler->mode32 ? 0x1f : 0x3f));
            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_s32);
    } else {
        SLJIT_ASSERT(!(flags & EX86_SHIFT_INS) || a == SLJIT_PREF_SHIFT_REG);
        /* reg_map[SLJIT_PREF_SHIFT_REG] is less than 8. */
        if (!(flags & EX86_SSE2_OP1)) {
            if (reg_map[a] >= 8)
                rex |= REX_R;
        }
        else if (freg_map[a] >= 8)
            rex |= REX_R;
    }
 
    if (rex)
        inst_size++;
 
    inst = (sljit_u8*)ensure_buf(compiler, 1 + inst_size);
    PTR_FAIL_IF(!inst);
 
    /* Encoding prefixes. */
    INC_SIZE(inst_size);
    if (flags & EX86_PREF_F2)
        *inst++ = 0xf2;
    else if (flags & EX86_PREF_F3)
        *inst++ = 0xf3;
    else if (flags & EX86_PREF_66)
        *inst++ = 0x66;
 
    /* Rex is always the last prefix. */
    if (rex)
        *inst++ = rex;
 
    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)
            *buf_ptr = 0;
        else if (!(flags & EX86_SSE2_OP1))
            *buf_ptr = U8(reg_lmap[a] << 3);
        else
            *buf_ptr = U8(freg_lmap[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 = U8(*buf_ptr | MOD_REG | (!(flags & EX86_SSE2_OP2) ? reg_lmap[b] : freg_lmap[b]));
        buf_ptr++;
    } else if (b & REG_MASK) {
        reg_lmap_b = reg_lmap[b & REG_MASK];
 
        if (!(b & OFFS_REG_MASK) || (b & OFFS_REG_MASK) == TO_OFFS_REG(SLJIT_SP)) {
            if (immb != 0 || reg_lmap_b == 5) {
                if (immb <= 127 && immb >= -128)
                    *buf_ptr |= 0x40;
                else
                    *buf_ptr |= 0x80;
            }
 
            if (!(b & OFFS_REG_MASK))
                *buf_ptr++ |= reg_lmap_b;
            else {
                buf_ptr[0] |= 0x04;
                buf_ptr[1] = U8(reg_lmap_b | (reg_lmap[OFFS_REG(b)] << 3));
                buf_ptr += 2;
            }
 
            if (immb != 0 || reg_lmap_b == 5) {
                if (immb <= 127 && immb >= -128)
                    *buf_ptr++ = U8(immb); /* 8 bit displacement. */
                else {
                    sljit_unaligned_store_s32(buf_ptr, (sljit_s32)immb); /* 32 bit displacement. */
                    buf_ptr += sizeof(sljit_s32);
                }
            }
        } else {
            if (reg_lmap_b == 5)
                *buf_ptr |= 0x40;
 
            buf_ptr[0] |= 0x04;
            buf_ptr[1] = U8(reg_lmap_b | (reg_lmap[OFFS_REG(b)] << 3) | (immb << 6));
            buf_ptr += 2;
 
            if (reg_lmap_b == 5)
                *buf_ptr++ = 0;
        }
    } else {
        buf_ptr[0] |= 0x04;
        buf_ptr[1] = 0x25;
        buf_ptr += 2;
        sljit_unaligned_store_s32(buf_ptr, (sljit_s32)immb); /* 32 bit displacement. */
        buf_ptr += sizeof(sljit_s32);
    }
 
    if (a == SLJIT_IMM) {
        if (flags & EX86_BYTE_ARG)
            *buf_ptr = U8(imma);
        else if (flags & EX86_HALF_ARG)
            sljit_unaligned_store_s16(buf_ptr, (sljit_s16)imma);
        else if (!(flags & EX86_SHIFT_INS))
            sljit_unaligned_store_s32(buf_ptr, (sljit_s32)imma);
    }
 
    return inst;
}
 
static sljit_s32 emit_vex_instruction(struct sljit_compiler *compiler, sljit_uw op,
    /* The first and second register operand. */
    sljit_s32 a, sljit_s32 v,
    /* The general operand (not immediate). */
    sljit_s32 b, sljit_sw immb)
{
    sljit_u8 *inst;
    sljit_u8 vex = 0;
    sljit_u8 vex_m = 0;
    sljit_uw size;
 
    SLJIT_ASSERT(((op & (EX86_PREF_F2 | EX86_PREF_F3 | EX86_PREF_66))
            & ((op & (EX86_PREF_F2 | EX86_PREF_F3 | EX86_PREF_66)) - 1)) == 0);
 
    op |= EX86_REX;
 
    if (op & VEX_OP_0F38)
        vex_m = 0x2;
    else if (op & VEX_OP_0F3A)
        vex_m = 0x3;
 
    if ((op & VEX_W) || ((op & VEX_AUTO_W) && !compiler->mode32)) {
        if (vex_m == 0)
            vex_m = 0x1;
 
        vex |= 0x80;
    }
 
    if (op & EX86_PREF_66)
        vex |= 0x1;
    else if (op & EX86_PREF_F2)
        vex |= 0x3;
    else if (op & EX86_PREF_F3)
        vex |= 0x2;
 
    op &= ~(EX86_PREF_66 | EX86_PREF_F2 | EX86_PREF_F3);
 
    if (op & VEX_256)
        vex |= 0x4;
 
    vex = U8(vex | ((((op & VEX_SSE2_OPV) ? freg_map[v] : reg_map[v]) ^ 0xf) << 3));
 
    size = op & ~(sljit_uw)0xff;
    size |= (vex_m == 0) ? (EX86_VEX_EXT | 2) : 3;
 
    inst = emit_x86_instruction(compiler, size, a, 0, b, immb);
    FAIL_IF(!inst);
 
    SLJIT_ASSERT((inst[-1] & 0xf0) == REX);
 
    /* If X or B is present in REX prefix. */
    if (vex_m == 0 && inst[-1] & 0x3)
        vex_m = 0x1;
 
    if (vex_m == 0) {
        vex |= U8(((inst[-1] >> 2) ^ 0x1) << 7);
 
        inst[-1] = 0xc5;
        inst[0] = vex;
        inst[1] = U8(op);
        return SLJIT_SUCCESS;
    }
 
    vex_m |= U8((inst[-1] ^ 0x7) << 5);
    inst[-1] = 0xc4;
    inst[0] = vex_m;
    inst[1] = vex;
    inst[2] = U8(op);
    return SLJIT_SUCCESS;
}
 
/* --------------------------------------------------------------------- */
/*  Enter / return                                                       */
/* --------------------------------------------------------------------- */
 
static sljit_u8* detect_far_jump_type(struct sljit_jump *jump, sljit_u8 *code_ptr)
{
    sljit_uw type = jump->flags >> TYPE_SHIFT;
 
    int short_addr = !(jump->flags & SLJIT_REWRITABLE_JUMP) && (jump->flags & JUMP_ADDR) && (jump->u.target <= 0xffffffff);
 
    /* The relative jump below specialized for this case. */
    SLJIT_ASSERT(reg_map[TMP_REG2] >= 8 && TMP_REG2 != SLJIT_TMP_DEST_REG);
 
    if (type < SLJIT_JUMP) {
        /* Invert type. */
        code_ptr[0] = U8(get_jump_code(type ^ 0x1) - 0x10);
        code_ptr[1] = short_addr ? (6 + 3) : (10 + 3);
        code_ptr += 2;
    }
 
    code_ptr[0] = short_addr ? REX_B : (REX_W | REX_B);
    code_ptr[1] = MOV_r_i32 | reg_lmap[TMP_REG2];
    code_ptr += 2;
    jump->addr = (sljit_uw)code_ptr;
 
    if (!(jump->flags & JUMP_ADDR))
        jump->flags |= PATCH_MD;
    else if (short_addr)
        sljit_unaligned_store_s32(code_ptr, (sljit_s32)jump->u.target);
    else
        sljit_unaligned_store_sw(code_ptr, (sljit_sw)jump->u.target);
 
    code_ptr += short_addr ? sizeof(sljit_s32) : sizeof(sljit_sw);
 
    code_ptr[0] = REX_B;
    code_ptr[1] = GROUP_FF;
    code_ptr[2] = U8(MOD_REG | (type >= SLJIT_FAST_CALL ? CALL_rm : JMP_rm) | reg_lmap[TMP_REG2]);
 
    return code_ptr + 3;
}
 
static sljit_u8* generate_mov_addr_code(struct sljit_jump *jump, sljit_u8 *code_ptr, sljit_u8 *code, sljit_sw executable_offset)
{
    sljit_uw addr;
    sljit_sw diff;
    SLJIT_UNUSED_ARG(executable_offset);
 
    SLJIT_ASSERT(((jump->flags >> JUMP_SIZE_SHIFT) & 0x1f) <= 10);
    if (jump->flags & JUMP_ADDR)
        addr = jump->u.target;
    else
        addr = (sljit_uw)SLJIT_ADD_EXEC_OFFSET(code, executable_offset) + jump->u.label->size;
 
    if (addr > 0xffffffffl) {
        diff = (sljit_sw)addr - (sljit_sw)SLJIT_ADD_EXEC_OFFSET(code_ptr, executable_offset);
 
        if (diff <= HALFWORD_MAX && diff >= HALFWORD_MIN) {
            SLJIT_ASSERT(((jump->flags >> JUMP_SIZE_SHIFT) & 0x1f) >= 7);
            code_ptr -= SSIZE_OF(s32) - 1;
 
            SLJIT_ASSERT((code_ptr[-3 - SSIZE_OF(s32)] & 0xf8) == REX_W);
            SLJIT_ASSERT((code_ptr[-2 - SSIZE_OF(s32)] & 0xf8) == MOV_r_i32);
 
            code_ptr[-3 - SSIZE_OF(s32)] = U8(REX_W | ((code_ptr[-3 - SSIZE_OF(s32)] & 0x1) << 2));
            code_ptr[-1 - SSIZE_OF(s32)] = U8(((code_ptr[-2 - SSIZE_OF(s32)] & 0x7) << 3) | 0x5);
            code_ptr[-2 - SSIZE_OF(s32)] = LEA_r_m;
 
            jump->flags |= PATCH_MW;
            return code_ptr;
        }
 
        jump->flags |= PATCH_MD;
        return code_ptr;
    }
 
    code_ptr -= 2 + sizeof(sljit_uw);
 
    SLJIT_ASSERT((code_ptr[0] & 0xf8) == REX_W);
    SLJIT_ASSERT((code_ptr[1] & 0xf8) == MOV_r_i32);
 
    if ((code_ptr[0] & 0x07) != 0) {
        SLJIT_ASSERT(((jump->flags >> JUMP_SIZE_SHIFT) & 0x1f) >= 6);
        code_ptr[0] = U8(code_ptr[0] & ~0x08);
        code_ptr += 2 + sizeof(sljit_s32);
    } else {
        SLJIT_ASSERT(((jump->flags >> JUMP_SIZE_SHIFT) & 0x1f) >= 5);
        code_ptr[0] = code_ptr[1];
        code_ptr += 1 + sizeof(sljit_s32);
    }
 
    return code_ptr;
}
 
#ifdef _WIN64
typedef struct {
    sljit_sw regs[2];
} sljit_sse2_reg;
#endif /* _WIN64 */
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_enter(struct sljit_compiler *compiler,
    sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
    sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
{
    sljit_uw size;
    sljit_s32 word_arg_count = 0;
    sljit_s32 saved_arg_count = SLJIT_KEPT_SAVEDS_COUNT(options);
    sljit_s32 saved_regs_size, tmp, i;
#ifdef _WIN64
    sljit_s32 saved_float_regs_size;
    sljit_s32 saved_float_regs_offset = 0;
    sljit_s32 float_arg_count = 0;
#endif /* _WIN64 */
    sljit_u8 *inst;
 
    CHECK_ERROR();
    CHECK(check_sljit_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
    set_emit_enter(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);
 
    if (options & SLJIT_ENTER_REG_ARG)
        arg_types = 0;
 
    /* Emit ENDBR64 at function entry if needed.  */
    FAIL_IF(emit_endbranch(compiler));
 
    compiler->mode32 = 0;
 
    /* Including the return address saved by the call instruction. */
    saved_regs_size = GET_SAVED_REGISTERS_SIZE(scratches, saveds - saved_arg_count, 1);
 
    tmp = SLJIT_S0 - saveds;
    for (i = SLJIT_S0 - saved_arg_count; i > tmp; i--) {
        size = reg_map[i] >= 8 ? 2 : 1;
        inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
        FAIL_IF(!inst);
        INC_SIZE(size);
        if (reg_map[i] >= 8)
            *inst++ = REX_B;
        PUSH_REG(reg_lmap[i]);
    }
 
    for (i = scratches; i >= SLJIT_FIRST_SAVED_REG; i--) {
        size = reg_map[i] >= 8 ? 2 : 1;
        inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
        FAIL_IF(!inst);
        INC_SIZE(size);
        if (reg_map[i] >= 8)
            *inst++ = REX_B;
        PUSH_REG(reg_lmap[i]);
    }
 
#ifdef _WIN64
    local_size += SLJIT_LOCALS_OFFSET;
    saved_float_regs_size = GET_SAVED_FLOAT_REGISTERS_SIZE(fscratches, fsaveds, sse2_reg);
 
    if (saved_float_regs_size > 0) {
        saved_float_regs_offset = ((local_size + 0xf) & ~0xf);
        local_size = saved_float_regs_offset + saved_float_regs_size;
    }
#else /* !_WIN64 */
    SLJIT_ASSERT(SLJIT_LOCALS_OFFSET == 0);
#endif /* _WIN64 */
 
    arg_types >>= SLJIT_ARG_SHIFT;
 
    while (arg_types > 0) {
        if ((arg_types & SLJIT_ARG_MASK) < SLJIT_ARG_TYPE_F64) {
            tmp = 0;
#ifndef _WIN64
            switch (word_arg_count) {
            case 0:
                tmp = SLJIT_R2;
                break;
            case 1:
                tmp = SLJIT_R1;
                break;
            case 2:
                tmp = TMP_REG1;
                break;
            default:
                tmp = SLJIT_R3;
                break;
            }
#else /* !_WIN64 */
            switch (word_arg_count + float_arg_count) {
            case 0:
                tmp = SLJIT_R3;
                break;
            case 1:
                tmp = SLJIT_R1;
                break;
            case 2:
                tmp = SLJIT_R2;
                break;
            default:
                tmp = TMP_REG1;
                break;
            }
#endif /* _WIN64 */
            if (arg_types & SLJIT_ARG_TYPE_SCRATCH_REG) {
                if (tmp != SLJIT_R0 + word_arg_count)
                    EMIT_MOV(compiler, SLJIT_R0 + word_arg_count, 0, tmp, 0);
            } else {
                EMIT_MOV(compiler, SLJIT_S0 - saved_arg_count, 0, tmp, 0);
                saved_arg_count++;
            }
            word_arg_count++;
        } else {
#ifdef _WIN64
            SLJIT_COMPILE_ASSERT(SLJIT_FR0 == 1, float_register_index_start);
            float_arg_count++;
            if (float_arg_count != float_arg_count + word_arg_count)
                FAIL_IF(emit_sse2_load(compiler, (arg_types & SLJIT_ARG_MASK) == SLJIT_ARG_TYPE_F32,
                    float_arg_count, float_arg_count + word_arg_count, 0));
#endif /* _WIN64 */
        }
        arg_types >>= SLJIT_ARG_SHIFT;
    }
 
    local_size = ((local_size + saved_regs_size + 0xf) & ~0xf) - saved_regs_size;
    compiler->local_size = local_size;
 
#ifdef _WIN64
    if (local_size > 0) {
        if (local_size <= 4 * 4096) {
            if (local_size > 4096)
                EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096);
            if (local_size > 2 * 4096)
                EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 2);
            if (local_size > 3 * 4096)
                EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -4096 * 3);
        }
        else {
            EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_IMM, local_size >> 12);
 
            EMIT_MOV(compiler, TMP_REG2, 0, SLJIT_MEM1(SLJIT_SP), -4096);
            BINARY_IMM32(SUB, 4096, SLJIT_SP, 0);
            BINARY_IMM32(SUB, 1, TMP_REG1, 0);
 
            inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
            FAIL_IF(!inst);
 
            INC_SIZE(2);
            inst[0] = JNE_i8;
            inst[1] = (sljit_u8)-21;
            local_size &= 0xfff;
        }
 
        if (local_size > 0)
            EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_MEM1(SLJIT_SP), -local_size);
    }
#endif /* _WIN64 */
 
    if (local_size > 0)
        BINARY_IMM32(SUB, local_size, SLJIT_SP, 0);
 
#ifdef _WIN64
    if (saved_float_regs_size > 0) {
        compiler->mode32 = 1;
 
        tmp = SLJIT_FS0 - fsaveds;
        for (i = SLJIT_FS0; i > tmp; i--) {
            FAIL_IF(emit_groupf(compiler, MOVAPS_xm_x | EX86_SSE2, i, SLJIT_MEM1(SLJIT_SP), saved_float_regs_offset));
            saved_float_regs_offset += 16;
        }
 
        for (i = fscratches; i >= SLJIT_FIRST_SAVED_FLOAT_REG; i--) {
            FAIL_IF(emit_groupf(compiler, MOVAPS_xm_x | EX86_SSE2, i, SLJIT_MEM1(SLJIT_SP), saved_float_regs_offset));
            saved_float_regs_offset += 16;
        }
    }
#endif /* _WIN64 */
 
    return SLJIT_SUCCESS;
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_set_context(struct sljit_compiler *compiler,
    sljit_s32 options, sljit_s32 arg_types, sljit_s32 scratches, sljit_s32 saveds,
    sljit_s32 fscratches, sljit_s32 fsaveds, sljit_s32 local_size)
{
    sljit_s32 saved_regs_size;
#ifdef _WIN64
    sljit_s32 saved_float_regs_size;
#endif /* _WIN64 */
 
    CHECK_ERROR();
    CHECK(check_sljit_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size));
    set_set_context(compiler, options, arg_types, scratches, saveds, fscratches, fsaveds, local_size);
 
#ifdef _WIN64
    local_size += SLJIT_LOCALS_OFFSET;
    saved_float_regs_size = GET_SAVED_FLOAT_REGISTERS_SIZE(fscratches, fsaveds, sse2_reg);
 
    if (saved_float_regs_size > 0)
        local_size = ((local_size + 0xf) & ~0xf) + saved_float_regs_size;
#else /* !_WIN64 */
    SLJIT_ASSERT(SLJIT_LOCALS_OFFSET == 0);
#endif /* _WIN64 */
 
    /* Including the return address saved by the call instruction. */
    saved_regs_size = GET_SAVED_REGISTERS_SIZE(scratches, saveds - SLJIT_KEPT_SAVEDS_COUNT(options), 1);
    compiler->local_size = ((local_size + saved_regs_size + 0xf) & ~0xf) - saved_regs_size;
    return SLJIT_SUCCESS;
}
 
static sljit_s32 emit_stack_frame_release(struct sljit_compiler *compiler, sljit_s32 is_return_to)
{
    sljit_uw size;
    sljit_s32 local_size, i, tmp;
    sljit_u8 *inst;
#ifdef _WIN64
    sljit_s32 saved_float_regs_offset;
    sljit_s32 fscratches = compiler->fscratches;
    sljit_s32 fsaveds = compiler->fsaveds;
#endif /* _WIN64 */
 
#ifdef _WIN64
    saved_float_regs_offset = GET_SAVED_FLOAT_REGISTERS_SIZE(fscratches, fsaveds, sse2_reg);
 
    if (saved_float_regs_offset > 0) {
        compiler->mode32 = 1;
        saved_float_regs_offset = (compiler->local_size - saved_float_regs_offset) & ~0xf;
 
        tmp = SLJIT_FS0 - fsaveds;
        for (i = SLJIT_FS0; i > tmp; i--) {
            FAIL_IF(emit_groupf(compiler, MOVAPS_x_xm | EX86_SSE2, i, SLJIT_MEM1(SLJIT_SP), saved_float_regs_offset));
            saved_float_regs_offset += 16;
        }
 
        for (i = fscratches; i >= SLJIT_FIRST_SAVED_FLOAT_REG; i--) {
            FAIL_IF(emit_groupf(compiler, MOVAPS_x_xm | EX86_SSE2, i, SLJIT_MEM1(SLJIT_SP), saved_float_regs_offset));
            saved_float_regs_offset += 16;
        }
 
        compiler->mode32 = 0;
    }
#endif /* _WIN64 */
 
    local_size = compiler->local_size;
 
    if (is_return_to && compiler->scratches < SLJIT_FIRST_SAVED_REG && (compiler->saveds == SLJIT_KEPT_SAVEDS_COUNT(compiler->options))) {
        local_size += SSIZE_OF(sw);
        is_return_to = 0;
    }
 
    if (local_size > 0)
        BINARY_IMM32(ADD, local_size, SLJIT_SP, 0);
 
    tmp = compiler->scratches;
    for (i = SLJIT_FIRST_SAVED_REG; i <= tmp; i++) {
        size = reg_map[i] >= 8 ? 2 : 1;
        inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
        FAIL_IF(!inst);
        INC_SIZE(size);
        if (reg_map[i] >= 8)
            *inst++ = REX_B;
        POP_REG(reg_lmap[i]);
    }
 
    tmp = SLJIT_S0 - SLJIT_KEPT_SAVEDS_COUNT(compiler->options);
    for (i = SLJIT_S0 + 1 - compiler->saveds; i <= tmp; i++) {
        size = reg_map[i] >= 8 ? 2 : 1;
        inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
        FAIL_IF(!inst);
        INC_SIZE(size);
        if (reg_map[i] >= 8)
            *inst++ = REX_B;
        POP_REG(reg_lmap[i]);
    }
 
    if (is_return_to)
        BINARY_IMM32(ADD, sizeof(sljit_sw), SLJIT_SP, 0);
 
    return SLJIT_SUCCESS;
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return_void(struct sljit_compiler *compiler)
{
    CHECK_ERROR();
    CHECK(check_sljit_emit_return_void(compiler));
 
    compiler->mode32 = 0;
 
    FAIL_IF(emit_stack_frame_release(compiler, 0));
    return emit_byte(compiler, RET_near);
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_return_to(struct sljit_compiler *compiler,
    sljit_s32 src, sljit_sw srcw)
{
    CHECK_ERROR();
    CHECK(check_sljit_emit_return_to(compiler, src, srcw));
 
    compiler->mode32 = 0;
 
    if ((src & SLJIT_MEM) || (src >= SLJIT_FIRST_SAVED_REG && src <= (SLJIT_S0 - SLJIT_KEPT_SAVEDS_COUNT(compiler->options)))) {
        ADJUST_LOCAL_OFFSET(src, srcw);
 
        EMIT_MOV(compiler, TMP_REG2, 0, src, srcw);
        src = TMP_REG2;
        srcw = 0;
    }
 
    FAIL_IF(emit_stack_frame_release(compiler, 1));
 
    SLJIT_SKIP_CHECKS(compiler);
    return sljit_emit_ijump(compiler, SLJIT_JUMP, src, srcw);
}
 
/* --------------------------------------------------------------------- */
/*  Call / return instructions                                           */
/* --------------------------------------------------------------------- */
 
#ifndef _WIN64
 
static sljit_s32 call_with_args(struct sljit_compiler *compiler, sljit_s32 arg_types, sljit_s32 *src_ptr)
{
    sljit_s32 src = src_ptr ? (*src_ptr) : 0;
    sljit_s32 word_arg_count = 0;
 
    SLJIT_ASSERT(reg_map[SLJIT_R1] == 6 && reg_map[SLJIT_R3] == 1 && reg_map[TMP_REG1] == 2);
    SLJIT_ASSERT(!(src & SLJIT_MEM));
 
    /* Remove return value. */
    arg_types >>= SLJIT_ARG_SHIFT;
 
    while (arg_types) {
        if ((arg_types & SLJIT_ARG_MASK) < SLJIT_ARG_TYPE_F64)
            word_arg_count++;
        arg_types >>= SLJIT_ARG_SHIFT;
    }
 
    if (word_arg_count == 0)
        return SLJIT_SUCCESS;
 
    if (word_arg_count >= 3) {
        if (src == SLJIT_R2)
            *src_ptr = TMP_REG1;
        EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_R2, 0);
    }
 
    return emit_mov(compiler, SLJIT_R2, 0, SLJIT_R0, 0);
}
 
#else
 
static sljit_s32 call_with_args(struct sljit_compiler *compiler, sljit_s32 arg_types, sljit_s32 *src_ptr)
{
    sljit_s32 src = src_ptr ? (*src_ptr) : 0;
    sljit_s32 arg_count = 0;
    sljit_s32 word_arg_count = 0;
    sljit_s32 float_arg_count = 0;
    sljit_s32 types = 0;
    sljit_s32 data_trandfer = 0;
    static sljit_u8 word_arg_regs[5] = { 0, SLJIT_R3, SLJIT_R1, SLJIT_R2, TMP_REG1 };
 
    SLJIT_ASSERT(reg_map[SLJIT_R3] == 1 && reg_map[SLJIT_R1] == 2 && reg_map[SLJIT_R2] == 8 && reg_map[TMP_REG1] == 9);
    SLJIT_ASSERT(!(src & SLJIT_MEM));
 
    arg_types >>= SLJIT_ARG_SHIFT;
 
    while (arg_types) {
        types = (types << SLJIT_ARG_SHIFT) | (arg_types & SLJIT_ARG_MASK);
 
        switch (arg_types & SLJIT_ARG_MASK) {
        case SLJIT_ARG_TYPE_F64:
        case SLJIT_ARG_TYPE_F32:
            arg_count++;
            float_arg_count++;
 
            if (arg_count != float_arg_count)
                data_trandfer = 1;
            break;
        default:
            arg_count++;
            word_arg_count++;
 
            if (arg_count != word_arg_count || arg_count != word_arg_regs[arg_count]) {
                data_trandfer = 1;
 
                if (src == word_arg_regs[arg_count]) {
                    EMIT_MOV(compiler, TMP_REG2, 0, src, 0);
                    *src_ptr = TMP_REG2;
                }
            }
            break;
        }
 
        arg_types >>= SLJIT_ARG_SHIFT;
    }
 
    if (!data_trandfer)
        return SLJIT_SUCCESS;
 
    while (types) {
        switch (types & SLJIT_ARG_MASK) {
        case SLJIT_ARG_TYPE_F64:
            if (arg_count != float_arg_count)
                FAIL_IF(emit_sse2_load(compiler, 0, arg_count, float_arg_count, 0));
            arg_count--;
            float_arg_count--;
            break;
        case SLJIT_ARG_TYPE_F32:
            if (arg_count != float_arg_count)
                FAIL_IF(emit_sse2_load(compiler, 1, arg_count, float_arg_count, 0));
            arg_count--;
            float_arg_count--;
            break;
        default:
            if (arg_count != word_arg_count || arg_count != word_arg_regs[arg_count])
                EMIT_MOV(compiler, word_arg_regs[arg_count], 0, word_arg_count, 0);
            arg_count--;
            word_arg_count--;
            break;
        }
 
        types >>= SLJIT_ARG_SHIFT;
    }
 
    return SLJIT_SUCCESS;
}
 
#endif
 
SLJIT_API_FUNC_ATTRIBUTE struct sljit_jump* sljit_emit_call(struct sljit_compiler *compiler, sljit_s32 type,
    sljit_s32 arg_types)
{
    CHECK_ERROR_PTR();
    CHECK_PTR(check_sljit_emit_call(compiler, type, arg_types));
 
    compiler->mode32 = 0;
 
    if ((type & 0xff) != SLJIT_CALL_REG_ARG)
        PTR_FAIL_IF(call_with_args(compiler, arg_types, NULL));
 
    if (type & SLJIT_CALL_RETURN) {
        PTR_FAIL_IF(emit_stack_frame_release(compiler, 0));
        type = SLJIT_JUMP | (type & SLJIT_REWRITABLE_JUMP);
    }
 
    SLJIT_SKIP_CHECKS(compiler);
    return sljit_emit_jump(compiler, type);
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_icall(struct sljit_compiler *compiler, sljit_s32 type,
    sljit_s32 arg_types,
    sljit_s32 src, sljit_sw srcw)
{
    CHECK_ERROR();
    CHECK(check_sljit_emit_icall(compiler, type, arg_types, src, srcw));
 
    compiler->mode32 = 0;
 
    if (src & SLJIT_MEM) {
        ADJUST_LOCAL_OFFSET(src, srcw);
        EMIT_MOV(compiler, TMP_REG2, 0, src, srcw);
        src = TMP_REG2;
    }
 
    if (type & SLJIT_CALL_RETURN) {
        if (src >= SLJIT_FIRST_SAVED_REG && src <= (SLJIT_S0 - SLJIT_KEPT_SAVEDS_COUNT(compiler->options))) {
            EMIT_MOV(compiler, TMP_REG2, 0, src, srcw);
            src = TMP_REG2;
        }
 
        FAIL_IF(emit_stack_frame_release(compiler, 0));
    }
 
    if ((type & 0xff) != SLJIT_CALL_REG_ARG)
        FAIL_IF(call_with_args(compiler, arg_types, &src));
 
    if (type & SLJIT_CALL_RETURN)
        type = SLJIT_JUMP;
 
    SLJIT_SKIP_CHECKS(compiler);
    return sljit_emit_ijump(compiler, type, src, srcw);
}
 
static sljit_s32 emit_fast_enter(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw dstw)
{
    sljit_u8 *inst;
 
    if (FAST_IS_REG(dst)) {
        if (reg_map[dst] < 8)
            return emit_byte(compiler, U8(POP_r + reg_lmap[dst]));
 
        inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
        FAIL_IF(!inst);
        INC_SIZE(2);
        *inst++ = REX_B;
        POP_REG(reg_lmap[dst]);
        return SLJIT_SUCCESS;
    }
 
    /* REX_W is not necessary (src is not immediate). */
    compiler->mode32 = 1;
    inst = emit_x86_instruction(compiler, 1, 0, 0, dst, dstw);
    FAIL_IF(!inst);
    *inst = POP_rm;
    return SLJIT_SUCCESS;
}
 
static sljit_s32 emit_fast_return(struct sljit_compiler *compiler, sljit_s32 src, sljit_sw srcw)
{
    sljit_u8 *inst;
 
    if (FAST_IS_REG(src)) {
        if (reg_map[src] < 8) {
            inst = (sljit_u8*)ensure_buf(compiler, 1 + 1 + 1);
            FAIL_IF(!inst);
 
            INC_SIZE(1 + 1);
            PUSH_REG(reg_lmap[src]);
        }
        else {
            inst = (sljit_u8*)ensure_buf(compiler, 1 + 2 + 1);
            FAIL_IF(!inst);
 
            INC_SIZE(2 + 1);
            *inst++ = REX_B;
            PUSH_REG(reg_lmap[src]);
        }
    }
    else {
        /* REX_W is not necessary (src is not immediate). */
        compiler->mode32 = 1;
        inst = emit_x86_instruction(compiler, 1, 0, 0, src, srcw);
        FAIL_IF(!inst);
        inst[0] = GROUP_FF;
        inst[1] |= PUSH_rm;
 
        inst = (sljit_u8*)ensure_buf(compiler, 1 + 1);
        FAIL_IF(!inst);
        INC_SIZE(1);
    }
 
    RET();
    return SLJIT_SUCCESS;
}
 
static sljit_s32 sljit_emit_get_return_address(struct sljit_compiler *compiler,
    sljit_s32 dst, sljit_sw dstw)
{
    sljit_s32 saved_regs_size;
 
    compiler->mode32 = 0;
    saved_regs_size = GET_SAVED_REGISTERS_SIZE(compiler->scratches, compiler->saveds - SLJIT_KEPT_SAVEDS_COUNT(compiler->options), 0);
    return emit_mov(compiler, dst, dstw, SLJIT_MEM1(SLJIT_SP), compiler->local_size + saved_regs_size);
}
 
/* --------------------------------------------------------------------- */
/*  Other operations                                                     */
/* --------------------------------------------------------------------- */
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_select(struct sljit_compiler *compiler, sljit_s32 type,
    sljit_s32 dst_reg,
    sljit_s32 src1, sljit_sw src1w,
    sljit_s32 src2_reg)
{
    CHECK_ERROR();
    CHECK(check_sljit_emit_select(compiler, type, dst_reg, src1, src1w, src2_reg));
 
    ADJUST_LOCAL_OFFSET(src1, src1w);
 
    compiler->mode32 = type & SLJIT_32;
    type &= ~SLJIT_32;
 
    if (dst_reg != src2_reg) {
        if (dst_reg == src1) {
            src1 = src2_reg;
            src1w = 0;
            type ^= 0x1;
        } else if (ADDRESSING_DEPENDS_ON(src1, dst_reg)) {
            EMIT_MOV(compiler, dst_reg, 0, src1, src1w);
            src1 = src2_reg;
            src1w = 0;
            type ^= 0x1;
        } else
            EMIT_MOV(compiler, dst_reg, 0, src2_reg, 0);
    }
 
    if (sljit_has_cpu_feature(SLJIT_HAS_CMOV)) {
        if (SLJIT_UNLIKELY(src1 == SLJIT_IMM)) {
            EMIT_MOV(compiler, TMP_REG2, 0, src1, src1w);
            src1 = TMP_REG2;
            src1w = 0;
        }
 
        return emit_groupf(compiler, U8(get_jump_code((sljit_uw)type) - 0x40), dst_reg, src1, src1w);
    }
 
    return emit_cmov_generic(compiler, type, dst_reg, src1, src1w);
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_mem(struct sljit_compiler *compiler, sljit_s32 type,
    sljit_s32 reg,
    sljit_s32 mem, sljit_sw memw)
{
    sljit_u8* inst;
    sljit_s32 i, next, reg_idx;
    sljit_u8 regs[2];
 
    CHECK_ERROR();
    CHECK(check_sljit_emit_mem(compiler, type, reg, mem, memw));
 
    if (!(reg & REG_PAIR_MASK))
        return sljit_emit_mem_unaligned(compiler, type, reg, mem, memw);
 
    ADJUST_LOCAL_OFFSET(mem, memw);
 
    compiler->mode32 = 0;
 
    if ((mem & REG_MASK) == 0) {
        EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_IMM, memw);
 
        mem = SLJIT_MEM1(TMP_REG1);
        memw = 0;
    } else if (!(mem & OFFS_REG_MASK) && ((memw < HALFWORD_MIN) || (memw > HALFWORD_MAX - SSIZE_OF(sw)))) {
        EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_IMM, memw);
 
        mem = SLJIT_MEM2(mem & REG_MASK, TMP_REG1);
        memw = 0;
    }
 
    regs[0] = U8(REG_PAIR_FIRST(reg));
    regs[1] = U8(REG_PAIR_SECOND(reg));
 
    next = SSIZE_OF(sw);
 
    if (!(type & SLJIT_MEM_STORE) && (regs[0] == (mem & REG_MASK) || regs[0] == OFFS_REG(mem))) {
        if (regs[1] == (mem & REG_MASK) || regs[1] == OFFS_REG(mem)) {
            /* Base and offset cannot be TMP_REG1. */
            EMIT_MOV(compiler, TMP_REG1, 0, OFFS_REG(mem), 0);
 
            if (regs[1] == OFFS_REG(mem))
                next = -SSIZE_OF(sw);
 
            mem = (mem & ~OFFS_REG_MASK) | TO_OFFS_REG(TMP_REG1);
        } else {
            next = -SSIZE_OF(sw);
 
            if (!(mem & OFFS_REG_MASK))
                memw += SSIZE_OF(sw);
        }
    }
 
    for (i = 0; i < 2; i++) {
        reg_idx = next > 0 ? i : (i ^ 0x1);
        reg = regs[reg_idx];
 
        if ((mem & OFFS_REG_MASK) && (reg_idx == 1)) {
            inst = (sljit_u8*)ensure_buf(compiler, (sljit_uw)(1 + 5));
            FAIL_IF(!inst);
 
            INC_SIZE(5);
 
            inst[0] = U8(REX_W | ((reg_map[reg] >= 8) ? REX_R : 0) | ((reg_map[mem & REG_MASK] >= 8) ? REX_B : 0) | ((reg_map[OFFS_REG(mem)] >= 8) ? REX_X : 0));
            inst[1] = (type & SLJIT_MEM_STORE) ? MOV_rm_r : MOV_r_rm;
            inst[2] = 0x44 | U8(reg_lmap[reg] << 3);
            inst[3] = U8(memw << 6) | U8(reg_lmap[OFFS_REG(mem)] << 3) | reg_lmap[mem & REG_MASK];
            inst[4] = sizeof(sljit_sw);
        } else if (type & SLJIT_MEM_STORE) {
            EMIT_MOV(compiler, mem, memw, reg, 0);
        } else {
            EMIT_MOV(compiler, reg, 0, mem, memw);
        }
 
        if (!(mem & OFFS_REG_MASK))
            memw += next;
    }
 
    return SLJIT_SUCCESS;
}
 
static sljit_s32 emit_mov_int(struct sljit_compiler *compiler, sljit_s32 sign,
    sljit_s32 dst, sljit_sw dstw,
    sljit_s32 src, sljit_sw srcw)
{
    sljit_u8* inst;
    sljit_s32 dst_r;
 
    compiler->mode32 = 0;
 
    if (src == SLJIT_IMM) {
        if (FAST_IS_REG(dst)) {
            if (!sign || ((sljit_u32)srcw <= 0x7fffffff))
                return emit_do_imm32(compiler, reg_map[dst] <= 7 ? 0 : REX_B, U8(MOV_r_i32 | reg_lmap[dst]), srcw);
 
            inst = emit_x86_instruction(compiler, 1, SLJIT_IMM, (sljit_sw)(sljit_s32)srcw, dst, dstw);
            FAIL_IF(!inst);
            *inst = MOV_rm_i32;
            return SLJIT_SUCCESS;
        }
        compiler->mode32 = 1;
        inst = emit_x86_instruction(compiler, 1, SLJIT_IMM, (sljit_sw)(sljit_s32)srcw, dst, dstw);
        FAIL_IF(!inst);
        *inst = MOV_rm_i32;
        compiler->mode32 = 0;
        return SLJIT_SUCCESS;
    }
 
    dst_r = FAST_IS_REG(dst) ? dst : TMP_REG1;
 
    if ((dst & SLJIT_MEM) && FAST_IS_REG(src))
        dst_r = src;
    else {
        if (sign) {
            inst = emit_x86_instruction(compiler, 1, dst_r, 0, src, srcw);
            FAIL_IF(!inst);
            *inst = MOVSXD_r_rm;
        } else {
            compiler->mode32 = 1;
            EMIT_MOV(compiler, dst_r, 0, src, srcw);
            compiler->mode32 = 0;
        }
    }
 
    if (dst & SLJIT_MEM) {
        compiler->mode32 = 1;
        inst = emit_x86_instruction(compiler, 1, dst_r, 0, dst, dstw);
        FAIL_IF(!inst);
        *inst = MOV_rm_r;
        compiler->mode32 = 0;
    }
 
    return SLJIT_SUCCESS;
}
 
static SLJIT_INLINE sljit_s32 sljit_emit_fop1_conv_f64_from_uw(struct sljit_compiler *compiler, sljit_s32 op,
    sljit_s32 dst, sljit_sw dstw,
    sljit_s32 src, sljit_sw srcw)
{
    sljit_s32 dst_r = FAST_IS_REG(dst) ? dst : TMP_FREG;
    sljit_u8 *inst, *jump_inst1, *jump_inst2;
    sljit_uw size1, size2;
 
    compiler->mode32 = 0;
 
    if (GET_OPCODE(op) == SLJIT_CONV_F64_FROM_U32) {
        if (src != SLJIT_IMM) {
            compiler->mode32 = 1;
            EMIT_MOV(compiler, TMP_REG1, 0, src, srcw);
            compiler->mode32 = 0;
        } else
            FAIL_IF(emit_do_imm32(compiler, reg_map[TMP_REG1] <= 7 ? 0 : REX_B, U8(MOV_r_i32 | reg_lmap[TMP_REG1]), srcw));
 
        FAIL_IF(emit_groupf(compiler, CVTSI2SD_x_rm | EX86_SELECT_F2_F3(op) | EX86_SSE2_OP1, dst_r, TMP_REG1, 0));
 
        compiler->mode32 = 1;
 
        if (dst_r == TMP_FREG)
            return emit_sse2_store(compiler, op & SLJIT_32, dst, dstw, TMP_FREG);
        return SLJIT_SUCCESS;
    }
 
    if (!FAST_IS_REG(src)) {
        EMIT_MOV(compiler, TMP_REG1, 0, src, srcw);
        src = TMP_REG1;
    }
 
    BINARY_IMM32(CMP, 0, src, 0);
 
    inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
    FAIL_IF(!inst);
    INC_SIZE(2);
    inst[0] = JL_i8;
    jump_inst1 = inst;
 
    size1 = compiler->size;
 
    compiler->mode32 = 0;
    FAIL_IF(emit_groupf(compiler, CVTSI2SD_x_rm | EX86_SELECT_F2_F3(op) | EX86_SSE2_OP1, dst_r, src, 0));
 
    inst = (sljit_u8*)ensure_buf(compiler, 1 + 2);
    FAIL_IF(!inst);
    INC_SIZE(2);
    inst[0] = JMP_i8;
    jump_inst2 = inst;
 
    size2 = compiler->size;
 
    jump_inst1[1] = U8(size2 - size1);
 
    if (src != TMP_REG1)
        EMIT_MOV(compiler, TMP_REG1, 0, src, 0);
 
    EMIT_MOV(compiler, TMP_REG2, 0, src, 0);
 
    inst = emit_x86_instruction(compiler, 1 | EX86_SHIFT_INS, SLJIT_IMM, 1, TMP_REG1, 0);
    FAIL_IF(!inst);
    inst[1] |= SHR;
 
    compiler->mode32 = 1;
    BINARY_IMM32(AND, 1, TMP_REG2, 0);
 
    compiler->mode32 = 0;
    inst = emit_x86_instruction(compiler, 1, TMP_REG1, 0, TMP_REG2, 0);
    FAIL_IF(!inst);
    inst[0] = OR_r_rm;
 
    FAIL_IF(emit_groupf(compiler, CVTSI2SD_x_rm | EX86_SELECT_F2_F3(op) | EX86_SSE2_OP1, dst_r, TMP_REG1, 0));
    compiler->mode32 = 1;
    FAIL_IF(emit_groupf(compiler, ADDSD_x_xm | EX86_SELECT_F2_F3(op) | EX86_SSE2, dst_r, dst_r, 0));
 
    jump_inst2[1] = U8(compiler->size - size2);
 
    if (dst_r == TMP_FREG)
        return emit_sse2_store(compiler, op & SLJIT_32, dst, dstw, TMP_FREG);
    return SLJIT_SUCCESS;
}
 
static sljit_s32 sljit_emit_fset(struct sljit_compiler *compiler,
    sljit_s32 freg, sljit_u8 rex, sljit_s32 is_zero)
{
    sljit_u8 *inst;
    sljit_u32 size;
 
    if (is_zero) {
        rex = freg_map[freg] >= 8 ? (REX_R | REX_B) : 0;
    } else {
        if (freg_map[freg] >= 8)
            rex |= REX_R;
        if (reg_map[TMP_REG1] >= 8)
            rex |= REX_B;
    }
 
    size = (rex != 0) ? 5 : 4;
 
    inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
    FAIL_IF(!inst);
    INC_SIZE(size);
 
    *inst++ = GROUP_66;
    if (rex != 0)
        *inst++ = rex;
    inst[0] = GROUP_0F;
 
    if (is_zero) {
        inst[1] = PXOR_x_xm;
        inst[2] = U8(freg_lmap[freg] | (freg_lmap[freg] << 3) | MOD_REG);
    } else {
        inst[1] = MOVD_x_rm;
        inst[2] = U8(reg_lmap[TMP_REG1] | (freg_lmap[freg] << 3) | MOD_REG);
    }
 
    return SLJIT_SUCCESS;
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fset32(struct sljit_compiler *compiler,
    sljit_s32 freg, sljit_f32 value)
{
    union {
        sljit_s32 imm;
        sljit_f32 value;
    } u;
 
    CHECK_ERROR();
    CHECK(check_sljit_emit_fset32(compiler, freg, value));
 
    u.value = value;
 
    if (u.imm != 0) {
        compiler->mode32 = 1;
        EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_IMM, u.imm);
    }
 
    return sljit_emit_fset(compiler, freg, 0, u.imm == 0);
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fset64(struct sljit_compiler *compiler,
    sljit_s32 freg, sljit_f64 value)
{
    union {
        sljit_sw imm;
        sljit_f64 value;
    } u;
 
    CHECK_ERROR();
    CHECK(check_sljit_emit_fset64(compiler, freg, value));
 
    u.value = value;
 
    if (u.imm != 0) {
        compiler->mode32 = 0;
        EMIT_MOV(compiler, TMP_REG1, 0, SLJIT_IMM, u.imm);
    }
 
    return sljit_emit_fset(compiler, freg, REX_W, u.imm == 0);
}
 
SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fcopy(struct sljit_compiler *compiler, sljit_s32 op,
    sljit_s32 freg, sljit_s32 reg)
{
    sljit_u8 *inst;
    sljit_u32 size;
    sljit_u8 rex = 0;
 
    CHECK_ERROR();
    CHECK(check_sljit_emit_fcopy(compiler, op, freg, reg));
 
    if (!(op & SLJIT_32))
        rex = REX_W;
 
    if (freg_map[freg] >= 8)
        rex |= REX_R;
 
    if (reg_map[reg] >= 8)
        rex |= REX_B;
 
    size = (rex != 0) ? 5 : 4;
 
    inst = (sljit_u8*)ensure_buf(compiler, 1 + size);
    FAIL_IF(!inst);
    INC_SIZE(size);
 
    *inst++ = GROUP_66;
    if (rex != 0)
        *inst++ = rex;
    inst[0] = GROUP_0F;
    inst[1] = GET_OPCODE(op) == SLJIT_COPY_TO_F64 ? MOVD_x_rm : MOVD_rm_x;
    inst[2] = U8(reg_lmap[reg] | (freg_lmap[freg] << 3) | MOD_REG);
 
    return SLJIT_SUCCESS;
}
 
static sljit_s32 skip_frames_before_return(struct sljit_compiler *compiler)
{
    sljit_s32 tmp, size;
 
    /* Don't adjust shadow stack if it isn't enabled.  */
    if (!cpu_has_shadow_stack())
        return SLJIT_SUCCESS;
 
    size = compiler->local_size;
    tmp = compiler->scratches;
    if (tmp >= SLJIT_FIRST_SAVED_REG)
        size += (tmp - SLJIT_FIRST_SAVED_REG + 1) * SSIZE_OF(sw);
    tmp = compiler->saveds < SLJIT_NUMBER_OF_SAVED_REGISTERS ? (SLJIT_S0 + 1 - compiler->saveds) : SLJIT_FIRST_SAVED_REG;
    if (SLJIT_S0 >= tmp)
        size += (SLJIT_S0 - tmp + 1) * SSIZE_OF(sw);
 
    return adjust_shadow_stack(compiler, SLJIT_MEM1(SLJIT_SP), size);
}