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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2012-10-02 11:35:25 -07:00
parent 3f9edad676
commit e9eab22e5c
1186 changed files with 381859 additions and 0 deletions
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64
lib/dl_simplifier_plugin.cpp Normal file
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/*++
Copyright (c) 2010 Microsoft Corporation
Module Name:
dl_simplifier_plugin.cpp
Abstract:
<abstract>
Author:
Nikolaj Bjorner (nbjorner) 2010-08-10
Revision History:
--*/
#include"dl_simplifier_plugin.h"
namespace datalog {
dl_simplifier_plugin::dl_simplifier_plugin(ast_manager& m)
: simplifier_plugin(symbol("datalog_relation"), m),
m_util(m)
{}
bool dl_simplifier_plugin::reduce(
func_decl * f, unsigned num_args, expr* const* args, expr_ref& result) {
uint64 v1, v2;
switch(f->get_decl_kind()) {
case OP_DL_LT:
if (m_util.try_get_constant(args[0], v1) &&
m_util.try_get_constant(args[1], v2)) {
result = (v1 < v2)?m_manager.mk_true():m_manager.mk_false();
return true;
}
// x < x <=> false
if (args[0] == args[1]) {
result = m_manager.mk_false();
return true;
}
// x < 0 <=> false
if (m_util.try_get_constant(args[1], v2) && v2 == 0) {
result = m_manager.mk_false();
return true;
}
// 0 < x <=> 0 != x
if (m_util.try_get_constant(args[1], v1) && v1 == 0) {
result = m_manager.mk_not(m_manager.mk_eq(args[0], args[1]));
return true;
}
break;
default:
break;
}
return false;
}
};