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Cherry-pick goodies from mcsat branch

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2013-06-27 09:19:23 -07:00
parent 42898f3276
commit f238720b76
2 changed files with 84 additions and 0 deletions
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53
src/ast/ast_util.cpp
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@ -1,3 +1,21 @@
/*++
Copyright (c) 2006 Microsoft Corporation
Module Name:
ast_util.cpp
Abstract:
Helper functions
Author:
Leonardo de Moura (leonardo) 2007-06-08.
Revision History:
--*/
#include "ast_util.h"
app * mk_list_assoc_app(ast_manager & m, func_decl * f, unsigned num_args, expr * const * args) {
@ -138,3 +156,38 @@ expr * get_clause_literal(ast_manager & m, expr * cls, unsigned idx) {
SASSERT(m.is_or(cls));
return to_app(cls)->get_arg(idx);
}
expr * mk_and(ast_manager & m, unsigned num_args, expr * const * args) {
if (num_args == 0)
return m.mk_true();
else if (num_args == 1)
return args[0];
else
return m.mk_and(num_args, args);
}
expr * mk_or(ast_manager & m, unsigned num_args, expr * const * args) {
if (num_args == 0)
return m.mk_false();
else if (num_args == 1)
return args[0];
else
return m.mk_or(num_args, args);
}
expr * mk_not(ast_manager & m, expr * arg) {
expr * atom;
if (m.is_not(arg, atom))
return atom;
else
return m.mk_not(arg);
}
expr * expand_distinct(ast_manager & m, unsigned num_args, expr * const * args) {
expr_ref_buffer new_diseqs(m);
for (unsigned i = 0; i < num_args; i++) {
for (unsigned j = i + 1; j < num_args; j++)
new_diseqs.push_back(m.mk_not(m.mk_eq(args[i], args[j])));
}
return mk_and(m, new_diseqs.size(), new_diseqs.c_ptr());
}