/** Emit type name for term. */
std::string
YicesSolver::get_typename(const SymbolicExpr::Ptr &expr) {
ASSERT_not_null(expr);
if (expr->isScalar())
return "(bitvector " + StringUtility::numberToString(expr->nBits()) + ")";
return ("(-> (bitvector " + StringUtility::numberToString(expr->domainWidth()) + ")"
" (bitvector " + StringUtility::numberToString(expr->nBits()) + "))");
}
/** Generate a Yices "assert" statement for an expression. */
void
YicesSolver::out_assert(std::ostream &o, const SymbolicExpr::Ptr &tn)
{
o <<"(assert ";
if (tn->isNumber() && 1==tn->nBits()) {
if (tn->toInt()) {
o <<"true";
} else {
o <<"false";
}
} else {
out_expr(o, tn);
}
o <<")\n";
}
/** Output for arithmetic right shift. Yices doesn't have a sign-extending right shift, therefore we implement it in terms of
* other operations. (OP_ASR ShiftAmount Vector) becomes
*
* (ite (= (mk-bv 1 1) (bv-extract [VectorSize-1] [VectorSize-1] Vector)) ;; vector's sign bit
* (bv-shift-right1 Vector [ShiftAmount])
* (bv-shift-right0 Vector [ShiftAmount]))
*
* where [VectorSize], [VectorSize-1], and [ShiftAmount] are numeric constants.
*/
void
YicesSolver::out_asr(std::ostream &o, const SymbolicExpr::InteriorPtr &in)
{
ASSERT_require(in && 2==in->nChildren());
SymbolicExpr::Ptr vector = in->child(1);
uint64_t vector_size = vector->nBits();
ASSERT_require(in->child(0)->isNumber());
uint64_t shift_amount = in->child(0)->toInt();
o <<"(ite (= (mk-bv 1 1) (bv-extract " <<(vector_size-1) <<" " <<(vector_size-1) <<" ";
out_expr(o, vector);
o <<")) (bv-shift-right1 ";
out_expr(o, vector);
o <<" " <<shift_amount <<") (bv-shift-right0 ";
out_expr(o, vector);
o <<" " <<shift_amount <<"))";
}