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int<->real coercions.

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2012-10-12 16:34:54 -07:00
parent c48bd1e8de
commit 75457e1393
9 changed files with 184 additions and 21 deletions
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36
lib/arith_rewriter.cpp
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@ -943,6 +943,42 @@ br_status arith_rewriter::mk_to_int_core(expr * arg, expr_ref & result) {
return BR_DONE;
}
else {
if (m_util.is_add(arg) || m_util.is_mul(arg) || m_util.is_power(arg)) {
// Try to apply simplifications such as:
// (to_int (+ 1.0 (to_real x))) --> (+ 1 x)
// if all arguments of arg are
// - integer numerals, OR
// - to_real applications
// then, to_int can be eliminated
unsigned num_args = to_app(arg)->get_num_args();
unsigned i = 0;
for (; i < num_args; i++) {
expr * c = to_app(arg)->get_arg(i);
if (m_util.is_numeral(c, a) && a.is_int())
continue;
if (m_util.is_to_real(c))
continue;
break; // failed
}
if (i == num_args) {
// simplification can be applied
expr_ref_buffer new_args(m());
for (i = 0; i < num_args; i++) {
expr * c = to_app(arg)->get_arg(i);
if (m_util.is_numeral(c, a) && a.is_int()) {
new_args.push_back(m_util.mk_numeral(a, true));
}
else {
SASSERT(m_util.is_to_real(c));
new_args.push_back(to_app(c)->get_arg(0));
}
}
SASSERT(num_args == new_args.size());
result = m().mk_app(get_fid(), to_app(arg)->get_decl()->get_decl_kind(), new_args.size(), new_args.c_ptr());
return BR_REWRITE1;
}
}
return BR_FAILED;
}
}