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fixed bug in is_char_const_range (#5724)

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Margus Veanes 2021-12-19 17:46:42 -08:00 • committed by GitHub
parent 25d54ebb40
commit be38b256c8
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2 changed files with 9 additions and 6 deletions
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8
src/ast/seq_decl_plugin.cpp
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@ -832,7 +832,7 @@ app* seq_util::mk_lt(expr* ch1, expr* ch2) const {
}
bool seq_util::is_char_const_range(expr const* x, expr* e, unsigned& l, unsigned& u, bool& negated) const {
expr* a, * b, * e1, * e2, * lb, * ub;
expr* a, * b, * e0, * e1, * e2, * lb, * ub;
e1 = e;
negated = (m.is_not(e, e1)) ? true : false;
if (m.is_eq(e1, a, b) && (a == x && is_const_char(b, l))) {
@ -849,7 +849,7 @@ bool seq_util::is_char_const_range(expr const* x, expr* e, unsigned& l, unsigned
u = max_char();
return true;
}
if (m.is_and(e1, e1, e2) && is_char_le(e1, lb, a) && a == x && is_const_char(lb, l) &&
if (m.is_and(e1, e0, e2) && is_char_le(e0, lb, a) && a == x && is_const_char(lb, l) &&
is_char_le(e2, b, ub) && b == x && is_const_char(ub, u))
// (l <= x) & (x <= u)
return true;
@ -857,8 +857,8 @@ bool seq_util::is_char_const_range(expr const* x, expr* e, unsigned& l, unsigned
u = l;
return true;
}
if (m.is_and(e1, e2, e1) && is_char_le(e1, lb, a) && a == x && is_const_char(lb, l) &&
is_char_le(e2, b, ub) && b == x && is_const_char(ub, u))
if (m.is_and(e1, e0, e2) && is_char_le(e0, a, ub) && a == x && is_const_char(ub, u) &&
is_char_le(e2, lb, b) && b == x && is_const_char(lb, l))
// (x <= u) & (l <= x)
return true;
return false;