cprover
boolbv_bitwise.cpp
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1 /*******************************************************************\
2 
3 Module:
4 
5 Author: Daniel Kroening, kroening@kroening.com
6 
7 \*******************************************************************/
8 
9 #include "boolbv.h"
10 
11 #include <util/bitvector_expr.h>
12 
14 {
15  const std::size_t width = boolbv_width(expr.type());
16  if(width==0)
17  return conversion_failed(expr);
18 
19  if(expr.id()==ID_bitnot)
20  {
21  const exprt &op = to_bitnot_expr(expr).op();
22  const bvt &op_bv = convert_bv(op, width);
23  return bv_utils.inverted(op_bv);
24  }
25  else if(expr.id()==ID_bitand || expr.id()==ID_bitor ||
26  expr.id()==ID_bitxor ||
27  expr.id()==ID_bitnand || expr.id()==ID_bitnor ||
28  expr.id()==ID_bitxnor)
29  {
30  bvt bv;
31  bv.resize(width);
32 
33  forall_operands(it, expr)
34  {
35  const bvt &op = convert_bv(*it, width);
36 
37  if(it==expr.operands().begin())
38  bv=op;
39  else
40  {
41  for(std::size_t i=0; i<width; i++)
42  {
43  if(expr.id()==ID_bitand)
44  bv[i]=prop.land(bv[i], op[i]);
45  else if(expr.id()==ID_bitor)
46  bv[i]=prop.lor(bv[i], op[i]);
47  else if(expr.id()==ID_bitxor)
48  bv[i]=prop.lxor(bv[i], op[i]);
49  else if(expr.id()==ID_bitnand)
50  bv[i]=prop.lnand(bv[i], op[i]);
51  else if(expr.id()==ID_bitnor)
52  bv[i]=prop.lnor(bv[i], op[i]);
53  else if(expr.id()==ID_bitxnor)
54  bv[i]=prop.lequal(bv[i], op[i]);
55  else
57  }
58  }
59  }
60 
61  return bv;
62  }
63 
65 }
UNIMPLEMENTED
#define UNIMPLEMENTED
Definition: invariant.h:523
bvt
std::vector< literalt > bvt
Definition: literal.h:201
exprt
Base class for all expressions.
Definition: expr.h:54
propt::lor
virtual literalt lor(literalt a, literalt b)=0
to_bitnot_expr
const bitnot_exprt & to_bitnot_expr(const exprt &expr)
Cast an exprt to a bitnot_exprt.
Definition: bitvector_expr.h:106
bv_utilst::inverted
static bvt inverted(const bvt &op)
Definition: bv_utils.cpp:579
propt::land
virtual literalt land(literalt a, literalt b)=0
exprt::type
typet & type()
Return the type of the expression.
Definition: expr.h:82
propt::lxor
virtual literalt lxor(literalt a, literalt b)=0
boolbvt::conversion_failed
void conversion_failed(const exprt &expr, bvt &bv)
Definition: boolbv.h:124
boolbvt::boolbv_width
virtual std::size_t boolbv_width(const typet &type) const
Definition: boolbv.h:96
forall_operands
#define forall_operands(it, expr)
Definition: expr.h:18
propt::lnand
virtual literalt lnand(literalt a, literalt b)=0
irept::id
const irep_idt & id() const
Definition: irep.h:407
unary_exprt::op
const exprt & op() const
Definition: std_expr.h:294
boolbvt::convert_bv
virtual const bvt & convert_bv(const exprt &expr, const optionalt< std::size_t > expected_width=nullopt)
Convert expression to vector of literalts, using an internal cache to speed up conversion if availabl...
Definition: boolbv.cpp:38
boolbvt::convert_bitwise
virtual bvt convert_bitwise(const exprt &expr)
Definition: boolbv_bitwise.cpp:13
propt::lequal
virtual literalt lequal(literalt a, literalt b)=0
boolbvt::bv_utils
bv_utilst bv_utils
Definition: boolbv.h:109
boolbv.h
exprt::operands
operandst & operands()
Definition: expr.h:96
bitvector_expr.h
API to expression classes for bitvectors.
prop_conv_solvert::prop
propt & prop
Definition: prop_conv_solver.h:128
propt::lnor
virtual literalt lnor(literalt a, literalt b)=0