18 typedef std::map<exprt, std::set<exprt> > used_bits_mapt;
19 used_bits_mapt used_bits_map;
23 if(it->id()==ID_extractbit && it->op1().is_constant())
25 used_bits_map[it->op0()].insert(it->op1());
27 else if(it->id()==ID_not &&
28 it->op0().id()==ID_extractbit && it->op0().op1().is_constant())
30 used_bits_map[it->op0().op0()].insert(it->op0().op1());
36 for(used_bits_mapt::const_iterator it=used_bits_map.begin();
37 it!=used_bits_map.end();
42 boolbv_get_width(it->first.type(), width);
44 std::string value_string;
45 value_string.resize(width,
'0');
47 if(it->second.size()==width)
49 const irep_idt &ident=it->first.get(ID_identifier);
53 for(exprt::operandst::const_iterator oit=old_operands.begin();
54 oit!=old_operands.end();
57 if(oit->id()==ID_extractbit &&
58 oit->op1().is_constant())
60 if(oit->op0().get(ID_identifier)==ident)
63 const std::size_t value = numeric_cast_v<std::size_t>(val_expr);
64 value_string[value]=
'1';
67 std::cout <<
"[" << value <<
"]=1\n";
73 else if(oit->id()==ID_not &&
74 oit->op0().id()==ID_extractbit &&
75 oit->op0().op1().is_constant())
77 if(oit->op0().op0().get(ID_identifier)==ident)
84 new_operands.push_back(*oit);
88 new_operands.push_back(equality_exprt(it->first, new_value));
91 std::cout <<
"FINAL: " << value_string <<
'\n';
void simplify_extractbits(exprt &expr) const
A constant literal expression.
const irep_idt & id() const
API to expression classes.
#define forall_operands(it, expr)
dstringt has one field, an unsigned integer no which is an index into a static table of strings.
std::vector< exprt > operandst
Base class for all expressions.