/src/pcre2/deps/sljit/sljit_src/sljitNativeX86_64.c

Source
/*
 *    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 += sizeof(sljit_s8);
        flags |= EX86_BYTE_ARG;
      } else
        inst_size += sizeof(sljit_s32);
    } else if (flags & EX86_SHIFT_INS) {
      SLJIT_ASSERT(imma <= (compiler->mode32 ? 0x1f : 0x3f));
      if (imma != 1) {
        inst_size += sizeof(sljit_s8);
        flags |= EX86_BYTE_ARG;
      }
    } else if (flags & EX86_BYTE_ARG)
      inst_size += sizeof(sljit_s8);
    else if (flags & EX86_HALF_ARG)
      inst_size += sizeof(sljit_s16);
    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_ADDR)) == 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 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 fscratches;
  sljit_s32 fsaveds;
  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, local_size));
  set_emit_enter(compiler, options, arg_types, scratches, saveds, local_size);

  scratches = ENTER_GET_REGS(scratches);
#ifdef _WIN64
  saveds = ENTER_GET_REGS(saveds);
  fscratches = compiler->fscratches;
  fsaveds = compiler->fsaveds;
#endif /* _WIN64 */

  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 local_size)
{
  sljit_s32 saved_regs_size;
#ifdef _WIN64
  sljit_s32 fscratches;
  sljit_s32 fsaveds;
  sljit_s32 saved_float_regs_size;
#endif /* _WIN64 */

  CHECK_ERROR();
  CHECK(check_sljit_set_context(compiler, options, arg_types, scratches, saveds, local_size));
  set_emit_enter(compiler, options, arg_types, scratches, saveds, local_size);

  scratches = ENTER_GET_REGS(scratches);

#ifdef _WIN64
  saveds = ENTER_GET_REGS(saveds);
  fscratches = compiler->fscratches;
  fsaveds = compiler->fsaveds;

  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 || src == SLJIT_R2) {
    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)
{
  sljit_u8* inst;

  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;

  if (type & SLJIT_COMPARE_SELECT) {
    if (!FAST_IS_REG(src1)) {
      EMIT_MOV(compiler, TMP_REG2, 0, src1, src1w);
      src1 = TMP_REG2;
      src1w = 0;
    }

    inst = emit_x86_instruction(compiler, 1, src1, 0, src2_reg, 0);
    FAIL_IF(!inst);
    *inst = CMP_r_rm;
  }

  type &= ~(SLJIT_32 | SLJIT_COMPARE_SELECT);

  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);
}

Coverage Report

Created: 2025-10-13 07:03