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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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6
src/ast/rewriter/arith_rewriter.cpp
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@ -70,6 +70,7 @@ br_status arith_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * c
case OP_TO_INT: SASSERT(num_args == 1); st = mk_to_int_core(args[0], result); break;
case OP_IS_INT: SASSERT(num_args == 1); st = mk_is_int(args[0], result); break;
case OP_POWER: SASSERT(num_args == 2); st = mk_power_core(args[0], args[1], result); break;
case OP_ABS: SASSERT(num_args == 1); st = mk_abs_core(args[0], result); break;
case OP_SIN: SASSERT(num_args == 1); st = mk_sin_core(args[0], result); break;
case OP_COS: SASSERT(num_args == 1); st = mk_cos_core(args[0], result); break;
case OP_TAN: SASSERT(num_args == 1); st = mk_tan_core(args[0], result); break;
@ -1024,6 +1025,11 @@ br_status arith_rewriter::mk_is_int(expr * arg, expr_ref & result) {
}
}
br_status arith_rewriter::mk_abs_core(expr * arg, expr_ref & result) {
result = m().mk_ite(m_util.mk_ge(arg, m_util.mk_numeral(rational(0), m_util.is_int(arg))), arg, m_util.mk_uminus(arg));
return BR_REWRITE2;
}
void arith_rewriter::set_cancel(bool f) {
m_util.set_cancel(f);
}