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Add support for abs (absolute value) function in theory arith (it is part of the SMT-LIB 2.0 standard)

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2013-02-03 15:28:56 -08:00
parent 490905e320
commit c4f762028f
6 changed files with 31 additions and 0 deletions
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9
src/ast/simplifier/arith_simplifier_plugin.cpp
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@ -404,6 +404,7 @@ bool arith_simplifier_plugin::reduce(func_decl * f, unsigned num_args, expr * co
case OP_TO_INT: SASSERT(num_args == 1); mk_to_int(args[0], result); break;
case OP_IS_INT: SASSERT(num_args == 1); mk_is_int(args[0], result); break;
case OP_POWER: return false;
case OP_ABS: SASSERT(num_args == 1); mk_abs(args[0], result); break;
case OP_IRRATIONAL_ALGEBRAIC_NUM: return false;
default:
UNREACHABLE();
@ -413,6 +414,14 @@ bool arith_simplifier_plugin::reduce(func_decl * f, unsigned num_args, expr * co
return true;
}
void arith_simplifier_plugin::mk_abs(expr * arg, expr_ref & result) {
expr_ref c(m_manager);
expr_ref m_arg(m_manager);
mk_uminus(arg, m_arg);
mk_ge(arg, m_util.mk_numeral(rational(0), m_util.is_int(arg)), c);
m_bsimp.mk_ite(c, arg, m_arg, result);
}
bool arith_simplifier_plugin::is_arith_term(expr * n) const {
return n->get_kind() == AST_APP && to_app(n)->get_family_id() == m_fid;
}