37 std::vector<mp_integer> bytes;
40 for(std::size_t bit = 0; bit < width; bit += bits_per_byte)
41 bytes.push_back((value >> bit)%
power(2, bits_per_byte));
45 for(std::size_t bit = 0; bit < width; bit += bits_per_byte)
49 "bytes is not empty because we just pushed just as many elements on "
50 "top of it as we are popping now");
51 new_value+=bytes.back()<<bit;
73 type_id == ID_integer || type_id == ID_natural ||
74 type_id == ID_unsignedbv || type_id == ID_signedbv)
83 else if(type_id==ID_rational)
92 else if(type_id==ID_fixedbv)
99 else if(type_id==ID_floatbv)
122 type_id == ID_integer || type_id == ID_natural ||
123 type_id == ID_unsignedbv || type_id == ID_signedbv)
132 else if(type_id==ID_rational)
141 else if(type_id==ID_fixedbv)
148 else if(type_id==ID_floatbv)
169 bool no_change =
true;
172 exprt::operandst::iterator constant;
175 bool constant_found =
false;
180 for(exprt::operandst::iterator it = new_operands.begin();
181 it != new_operands.end();)
190 it->type().id()!=ID_floatbv)
196 bool do_erase =
false;
199 if(it->is_constant() && it->type()==expr.
type())
202 if(!c_sizeof_type.has_value())
204 const typet &sizeof_type =
205 static_cast<const typet &
>(it->find(ID_C_c_sizeof_type));
207 c_sizeof_type = sizeof_type;
220 constant_found =
true;
227 it = new_operands.erase(it);
234 if(c_sizeof_type.has_value())
238 "c_sizeof_type is only set to a non-nil value "
239 "if a constant has been found");
240 constant->set(ID_C_c_sizeof_type, *c_sizeof_type);
243 if(new_operands.size() == 1)
245 return new_operands.front();
250 if(constant_found && constant->is_one())
253 new_operands.erase(constant);
256 if(new_operands.size() == 1)
257 return new_operands.front();
266 tmp.
operands() = std::move(new_operands);
267 return std::move(tmp);
278 if(expr_type!=expr.
op0().
type() ||
284 if(expr_type.
id()==ID_signedbv ||
285 expr_type.
id()==ID_unsignedbv ||
286 expr_type.
id()==ID_natural ||
287 expr_type.
id()==ID_integer)
289 const auto int_value0 = numeric_cast<mp_integer>(expr.
op0());
290 const auto int_value1 = numeric_cast<mp_integer>(expr.
op1());
293 if(int_value1.has_value() && *int_value1 == 0)
297 if(int_value1.has_value() && *int_value1 == 1)
303 if(int_value0.has_value() && *int_value0 == 0)
308 if(int_value0.has_value() && int_value1.has_value())
310 mp_integer result = *int_value0 / *int_value1;
314 else if(expr_type.
id()==ID_rational)
322 if(ok1 && rat_value1.
is_zero())
325 if((ok1 && rat_value1.
is_one()) ||
337 return std::move(tmp);
340 else if(expr_type.
id()==ID_fixedbv)
370 if(expr.
type().
id()==ID_signedbv ||
371 expr.
type().
id()==ID_unsignedbv ||
372 expr.
type().
id()==ID_natural ||
373 expr.
type().
id()==ID_integer)
378 const auto int_value0 = numeric_cast<mp_integer>(expr.
op0());
379 const auto int_value1 = numeric_cast<mp_integer>(expr.
op1());
381 if(int_value1.has_value() && *int_value1 == 0)
385 (int_value1.has_value() && *int_value1 == 1) ||
386 (int_value0.has_value() && *int_value0 == 0))
391 if(int_value0.has_value() && int_value1.has_value())
393 mp_integer result = *int_value0 % *int_value1;
407 bool no_change =
true;
414 if(expr.
type().
id() == ID_floatbv)
419 const exprt::operandst::iterator next = std::next(it);
421 if(next != new_operands.end())
423 if(it->type()==next->type() &&
428 new_operands.erase(next);
439 expr.
op0().
id() == ID_plus && expr.
op0().
type().
id() == ID_pointer &&
444 if(op0.
op1().
id() == ID_plus)
459 if(
is_number(it->type()) && it->is_constant())
465 exprt::operandst::iterator const_sum;
466 bool const_sum_set=
false;
468 for(
auto it = new_operands.begin(); it != new_operands.end(); it++)
470 if(
is_number(it->type()) && it->is_constant())
492 typedef std::unordered_map<exprt, exprt::operandst::iterator, irep_hash>
496 for(
auto it = new_operands.begin(); it != new_operands.end(); it++)
497 if(it->id() == ID_unary_minus)
503 for(
auto it = new_operands.begin(); it != new_operands.end(); it++)
507 else if(it->id()==ID_unary_minus)
510 expr_mapt::iterator itm=expr_map.find(*it);
512 if(itm!=expr_map.end())
524 for(exprt::operandst::iterator it = new_operands.begin();
525 it != new_operands.end();
528 if(
is_number(it->type()) && it->is_zero())
530 it = new_operands.erase(it);
538 if(new_operands.empty())
542 else if(new_operands.size() == 1)
544 return new_operands.front();
552 tmp.
operands() = std::move(new_operands);
553 return std::move(tmp);
561 if(!
is_number(minus_expr.type()) && minus_expr.type().id() != ID_pointer)
576 minus_expr.type().id() == ID_pointer &&
577 operands[0].type().id() == ID_pointer &&
is_number(operands[1].type()))
587 is_number(minus_expr.type()) && operands[0].type().id() == ID_pointer &&
588 operands[1].type().id() == ID_pointer)
592 if(operands[0]==operands[1])
606 if(expr.
type().
id()!=ID_bool)
613 it->id() == ID_typecast &&
617 else if(it->is_zero() || it->is_one())
629 if(expr.
id()==ID_bitand)
631 else if(expr.
id()==ID_bitor)
633 else if(expr.
id()==ID_bitxor)
640 if(it->id()==ID_typecast)
642 else if(it->is_zero())
644 else if(it->is_one())
655 bool no_change =
true;
656 auto new_expr = expr;
662 while(new_expr.operands().size() >= 2)
664 if(!new_expr.op0().is_constant())
667 if(!new_expr.op1().is_constant())
670 if(new_expr.op0().type() != new_expr.type())
673 if(new_expr.op1().type() != new_expr.type())
679 std::function<bool(
bool,
bool)> f;
681 if(new_expr.id() == ID_bitand)
682 f = [](
bool a,
bool b) {
return a && b; };
683 else if(new_expr.id() == ID_bitor)
684 f = [](
bool a,
bool b) {
return a || b; };
685 else if(new_expr.id() == ID_bitxor)
686 f = [](
bool a,
bool b) {
return a != b; };
691 make_bvrep(width, [&a_val, &b_val, &width, &f](std::size_t i) {
699 new_expr.operands().erase(new_expr.operands().begin());
700 new_expr.op0().swap(new_op);
707 if(new_expr.id() == ID_bitor || new_expr.id() == ID_bitxor)
709 for(exprt::operandst::iterator it = new_expr.operands().begin();
710 it != new_expr.operands().end();)
712 if(it->is_zero() && new_expr.operands().size() > 1)
714 it = new_expr.operands().erase(it);
718 it->is_constant() && it->type().id() == ID_bv &&
720 new_expr.operands().size() > 1)
722 it = new_expr.operands().erase(it);
732 if(new_expr.id() == ID_bitand)
734 const auto all_ones =
power(2, width) - 1;
735 for(exprt::operandst::iterator it = new_expr.operands().begin();
736 it != new_expr.operands().end();)
742 new_expr.operands().size() > 1)
744 it = new_expr.operands().erase(it);
754 if(new_expr.operands().size() == 2 && new_expr.op0() == new_expr.op1())
756 if(new_expr.id() == ID_bitand || new_expr.id() == ID_bitor)
758 return new_expr.op0();
760 else if(new_expr.id() == ID_bitxor)
766 if(new_expr.operands().size() == 1)
767 return new_expr.op0();
772 return std::move(new_expr);
785 const auto index_converted_to_int = numeric_cast<mp_integer>(expr.
index());
787 !index_converted_to_int.has_value() || *index_converted_to_int < 0 ||
788 *index_converted_to_int >= src_bit_width)
799 numeric_cast_v<std::size_t>(*index_converted_to_int));
807 bool no_change =
true;
819 const bool value = op.
is_true();
828 while(i < new_expr.
operands().size() - 1)
843 const auto new_width = width_i + width_n;
846 new_width, [&value_i, &value_n, width_i, width_n](std::size_t x) {
861 else if(new_expr.
type().
id() == ID_verilog_unsignedbv)
866 while(i < new_expr.
operands().size() - 1)
873 (opi.
type().
id()==ID_verilog_unsignedbv ||
875 (opn.
type().
id()==ID_verilog_unsignedbv ||
879 const std::string new_value=
881 opi.
set(ID_value, new_value);
883 opi.
type().
id(ID_verilog_unsignedbv);
897 return new_expr.
op0();
903 return std::move(new_expr);
912 const auto distance = numeric_cast<mp_integer>(expr.
distance());
914 if(!distance.has_value())
920 auto value = numeric_cast<mp_integer>(expr.
op());
923 !value.has_value() && expr.
op().
type().
id() == ID_bv &&
924 expr.
op().
id() == ID_constant)
931 if(!value.has_value())
935 expr.
op().
type().
id() == ID_unsignedbv ||
940 if(expr.
id()==ID_lshr)
943 if(*distance >= width)
947 else if(*distance >= 0)
950 *value +=
power(2, width);
951 *value /=
power(2, *distance);
955 else if(expr.
id()==ID_ashr)
964 else if(expr.
id()==ID_shl)
967 if(*distance >= width)
971 else if(*distance >= 0)
973 *value *=
power(2, *distance);
981 if(expr.
id()==ID_lshr)
985 *value /=
power(2, *distance);
989 else if(expr.
id()==ID_ashr)
995 if(*value < 0 && new_value == 0)
1001 else if(expr.
id()==ID_shl)
1005 *value *=
power(2, *distance);
1020 const auto base = numeric_cast<mp_integer>(expr.
op0());
1021 const auto exponent = numeric_cast<mp_integer>(expr.
op1());
1023 if(!base.has_value())
1026 if(!exponent.has_value())
1046 const auto start = numeric_cast<mp_integer>(expr.
upper());
1047 const auto end = numeric_cast<mp_integer>(expr.
lower());
1049 if(!start.has_value())
1052 if(!end.has_value())
1057 if(!width.has_value())
1060 if(*start < 0 || *start >= (*width) || *end < 0 || *end >= (*width))
1063 DATA_INVARIANT(*start >= *end,
"extractbits must have upper() >= lower()");
1069 if(!svalue.has_value() || svalue->size() != *width)
1072 std::string extracted_value = svalue->substr(
1073 numeric_cast_v<std::size_t>(*end),
1074 numeric_cast_v<std::size_t>(*start - *end + 1));
1077 if(!result.has_value())
1080 return std::move(*result);
1082 else if(expr.
src().
id() == ID_concatenation)
1092 if(!op_width.has_value() || *op_width <= 0)
1095 if(*start + 1 == offset && *end + *op_width == offset)
1101 return std::move(tmp);
1104 offset -= *op_width;
1124 const exprt &operand = expr.
op();
1129 if(operand.
id()==ID_unary_minus)
1137 else if(operand.
id()==ID_constant)
1142 if(type_id==ID_integer ||
1143 type_id==ID_signedbv ||
1144 type_id==ID_unsignedbv)
1146 const auto int_value = numeric_cast<mp_integer>(constant_expr);
1148 if(!int_value.has_value())
1153 else if(type_id==ID_rational)
1161 else if(type_id==ID_fixedbv)
1167 else if(type_id==ID_floatbv)
1183 const auto &type = expr.
type();
1186 type.id() == ID_bv || type.id() == ID_unsignedbv ||
1187 type.id() == ID_signedbv)
1191 if(op.
type() == type)
1193 if(op.
id()==ID_constant)
1196 const auto new_value =
1197 make_bvrep(width, [&value, &width](std::size_t i) {
1212 if(expr.
type().
id()!=ID_bool)
1223 if((expr.
id()==ID_equal || expr.
id()==ID_notequal) &&
1227 auto new_expr = expr;
1228 new_expr.
op0().
swap(new_expr.op1());
1232 if(tmp0.
id()==ID_if && tmp0.
operands().size()==3)
1246 (expr.
id() == ID_equal || expr.
id() == ID_notequal))
1251 if(tmp0.
id()==ID_pointer_object &&
1252 tmp1.
id()==ID_pointer_object &&
1253 (expr.
id()==ID_equal || expr.
id()==ID_notequal))
1258 if(tmp0.
type().
id()==ID_c_enum_tag)
1261 if(tmp1.
type().
id()==ID_c_enum_tag)
1268 if(tmp0_const && tmp1_const)
1278 if(expr.
id()==ID_ge)
1280 else if(expr.
id()==ID_le)
1282 else if(expr.
id()==ID_gt)
1284 else if(expr.
id()==ID_lt)
1312 if(tmp0.
type().
id() == ID_c_enum_tag)
1315 if(tmp1.
type().
id() == ID_c_enum_tag)
1321 if(expr.
id() == ID_equal || expr.
id() == ID_notequal)
1325 bool equal = (tmp0_const.get_value() == tmp1_const.get_value());
1327 !equal && tmp0_const.type().id() == ID_pointer &&
1328 tmp1_const.type().id() == ID_pointer)
1332 tmp1_const.get_value() == ID_NULL))
1338 equal = tmp0_const.is_zero() && tmp1_const.is_zero();
1343 if(tmp0.
type().
id() == ID_fixedbv)
1348 if(expr.
id() == ID_ge)
1350 else if(expr.
id() == ID_le)
1352 else if(expr.
id() == ID_gt)
1354 else if(expr.
id() == ID_lt)
1359 else if(tmp0.
type().
id() == ID_floatbv)
1364 if(expr.
id() == ID_ge)
1366 else if(expr.
id() == ID_le)
1368 else if(expr.
id() == ID_gt)
1370 else if(expr.
id() == ID_lt)
1375 else if(tmp0.
type().
id() == ID_rational)
1385 if(expr.
id() == ID_ge)
1387 else if(expr.
id() == ID_le)
1389 else if(expr.
id() == ID_gt)
1391 else if(expr.
id() == ID_lt)
1398 const auto v0 = numeric_cast<mp_integer>(tmp0_const);
1403 const auto v1 = numeric_cast<mp_integer>(tmp1_const);
1408 if(expr.
id() == ID_ge)
1410 else if(expr.
id() == ID_le)
1412 else if(expr.
id() == ID_gt)
1414 else if(expr.
id() == ID_lt)
1432 if(op0.
id()==ID_plus)
1434 bool no_change =
true;
1442 else if(op1.
id()==ID_plus)
1444 bool no_change =
true;
1455 op0.
type().
id()!=ID_complex)
1473 if(expr.
op0().
type().
id() == ID_floatbv)
1477 if(expr.
id()==ID_notequal)
1479 auto new_rel_expr = expr;
1480 new_rel_expr.
id(ID_equal);
1484 else if(expr.
id()==ID_gt)
1486 auto new_rel_expr = expr;
1487 new_rel_expr.
id(ID_ge);
1489 new_rel_expr.lhs().
swap(new_rel_expr.rhs());
1493 else if(expr.
id()==ID_lt)
1495 auto new_rel_expr = expr;
1496 new_rel_expr.
id(ID_ge);
1500 else if(expr.
id()==ID_le)
1502 auto new_rel_expr = expr;
1503 new_rel_expr.
id(ID_ge);
1505 new_rel_expr.lhs().
swap(new_rel_expr.rhs());
1512 expr.
id() == ID_ge || expr.
id() == ID_equal,
1513 "we previously converted all other cases to >= or ==");
1517 if(expr.
op0() == expr.
op1())
1522 if(expr.
id()==ID_equal)
1558 if(expr.
id()==ID_notequal)
1560 auto new_rel_expr = expr;
1561 new_rel_expr.
id(ID_equal);
1567 if(expr.
id()==ID_equal &&
1569 expr.
op1().
get(ID_value)==ID_NULL)
1573 if(expr.
op0().
id() == ID_address_of)
1578 object.
id() == ID_symbol ||
object.
id() == ID_dynamic_object ||
1579 object.
id() == ID_member ||
object.
id() == ID_index ||
1580 object.
id() == ID_string_constant)
1586 expr.
op0().
id() == ID_typecast &&
1590 const auto &
object =
1594 object.
id() == ID_symbol ||
object.
id() == ID_dynamic_object ||
1595 object.
id() == ID_member ||
object.
id() == ID_index ||
1596 object.
id() == ID_string_constant)
1602 expr.
op0().
id() == ID_typecast && expr.
op0().
type().
id() == ID_pointer)
1606 op.
type().
id() != ID_pointer &&
1608 op.
type().
id() == ID_complex))
1615 auto new_expr = expr;
1617 if(new_expr.op0().type().id() != ID_pointer)
1618 new_expr.op1() =
from_integer(0, new_expr.op0().type());
1620 new_expr.op1().type() = new_expr.op0().type();
1631 if(expr.
op0().
id()==ID_plus)
1635 if(expr.
id()==ID_equal || expr.
id()==ID_notequal)
1638 bool op_changed =
false;
1639 auto new_expr = expr;
1643 if(it->is_constant())
1661 new_expr.op1() =
from_integer(i, new_expr.op1().type());
1674 expr.
op0().
id() == ID_typecast && expr.
op0().
type().
id() == ID_floatbv &&
1681 ieee_floatt const_val_converted_back=const_val_converted;
1684 if(const_val_converted_back==const_val)
1689 return std::move(result);
1698 if(expr.
id()==ID_ge &&
1705 auto new_expr = expr;
1708 if(expr.
id()==ID_equal)
1711 if(operand.
id()==ID_unary_minus)
1714 return std::move(new_expr);
1716 else if(operand.
id()==ID_plus)
1721 if(operand_plus_expr.operands().size() == 2)
1724 if(operand_plus_expr.op0().id() == ID_unary_minus)
1725 operand_plus_expr.op0().swap(operand_plus_expr.op1());
1727 if(operand_plus_expr.op1().id() == ID_unary_minus)
1730 operand_plus_expr.op0(),
1742 expr.
op0().
id() == ID_typecast &&
1756 return lhs_typecast_op;
1760 #define NORMALISE_CONSTANT_TESTS
1761 #ifdef NORMALISE_CONSTANT_TESTS
1763 if(expr.
op0().
type().
id()==ID_unsignedbv ||
1768 if(expr.
id()==ID_notequal)
1770 auto new_rel_expr = expr;
1771 new_rel_expr.
id(ID_equal);
1775 else if(expr.
id()==ID_gt)
1784 auto new_expr = expr;
1787 new_expr.op1() =
from_integer(i, new_expr.op1().type());
1790 else if(expr.
id()==ID_lt)
1792 auto new_rel_expr = expr;
1793 new_rel_expr.
id(ID_ge);
1797 else if(expr.
id()==ID_le)
1806 auto new_rel_expr = expr;
1807 new_rel_expr.
id(ID_ge);
1809 new_rel_expr.op1() =
from_integer(i, new_rel_expr.op1().type());