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optimization: return integer consts for strlen() over constant strings

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This commit is contained in:
Murphy Berzish 2015-09-07 19:51:52 -04:00
parent 9b04f1570f
commit 799fd07c85
2 changed files with 13 additions and 4 deletions
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14
src/smt/theory_str.cpp
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@ -26,7 +26,8 @@ namespace smt {
theory_str::theory_str(ast_manager & m):
theory(m.mk_family_id("str")),
search_started(false),
m_autil(m)
m_autil(m),
m_strutil(m)
{
}
@ -100,8 +101,15 @@ bool theory_str::internalize_term(app * term) {
}
app * theory_str::mk_strlen(app * e) {
expr * args[1] = {e};
return get_manager().mk_app(get_id(), OP_STRLEN, 0, 0, 1, args);
if (m_strutil.is_string(e)) {
const char * strval = 0;
m_strutil.is_string(e, &strval);
int len = strlen(strval);
return m_autil.mk_numeral(rational(len), true);
} else {
expr * args[1] = {e};
return get_manager().mk_app(get_id(), OP_STRLEN, 0, 0, 1, args);
}
}
/*