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| author | Andrew Reynolds <andrew.j.reynolds@gmail.com> | 2020-06-15 09:40:34 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-06-15 07:40:34 -0700 |
| commit | 5de97c3efe8794bf7e39774686dca81a1982a8ed (patch) | |
| tree | 092aca5e779a1a719e88a78ff4755df88210cad9 /src | |
| parent | 60ed666d657bfcd69f48821c78a34696796df5fb (diff) | |
Do RE derivation inference only for concrete constant RE (#4609)
The RE derive inference was not designed to handle re.comp. This makes the application of this inference more conservative.
Diffstat (limited to 'src')
| -rw-r--r-- | src/theory/strings/regexp_solver.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/theory/strings/regexp_solver.cpp b/src/theory/strings/regexp_solver.cpp index db7e2d836..c9cee97a0 100644 --- a/src/theory/strings/regexp_solver.cpp +++ b/src/theory/strings/regexp_solver.cpp @@ -599,7 +599,8 @@ bool RegExpSolver::deriveRegExp(Node x, Trace("regexp-derive") << "RegExpSolver::deriveRegExp: x=" << x << ", r= " << r << std::endl; CVC4::String s = getHeadConst(x); - if (!s.empty() && d_regexp_opr.checkConstRegExp(r)) + // only allow RE_DERIVE for concrete constant regular expressions + if (!s.empty() && d_regexp_opr.getRegExpConstType(r) == RE_C_CONRETE_CONSTANT) { Node conc = Node::null(); Node dc = r; |