fix BatchingSearcher's disabled time budget

The functionality of the batching searcher that increases the time
budget if it is shorter than the time between two calls to
`selectState()` ignored the disabled time budget. Effectively, the
batching searcher thus picks a very arbitrary time budget on its own.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/Core/Searcher.cpp b/lib/Core/Searcher.cpp
index 080c31aa..f5d6543f 100644
--- a/lib/Core/Searcher.cpp
+++ b/lib/Core/Searcher.cpp
@@ -423,7 +423,7 @@ ExecutionState &BatchingSearcher::selectState() {
         (time::getWallTime() - lastStartTime) > timeBudget)) ||
       ((instructionBudget > 0) &&
        (stats::instructions - lastStartInstructions) > instructionBudget)) {
-    if (lastState) {
+    if (lastState && timeBudget.toSeconds() > 0) {
       time::Span delta = time::getWallTime() - lastStartTime;
       auto t = timeBudget;
       t *= 1.1;