Memoize results from the fast predicate matcher

This gains another 15% for the parser, again with a very simple change
that has no impact if the fast predicate matcher fails to work.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/xact.h b/src/xact.h
index 07f9a6c7..c819b2a0 100644
--- a/src/xact.h
+++ b/src/xact.h
@@ -148,6 +148,8 @@ public:
   predicate_t predicate;
   bool        try_quick_match;
 
+  std::map<string, bool> memoized_results;
+
   auto_xact_t() : try_quick_match(true) {
     TRACE_CTOR(auto_xact_t, "");
   }