From db152b332b310725861f98966f98e785de7f304f Mon Sep 17 00:00:00 2001
From: David Shah <dave@ds0.me>
Date: Mon, 1 Apr 2019 12:18:02 +0100
Subject: HeAP: Don't call Eigen if system is empty

Fixes #259

Signed-off-by: David Shah <dave@ds0.me>
---
 common/placer_heap.cc | 3 ++-
 tests                 | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/common/placer_heap.cc b/common/placer_heap.cc
index 7caf536d..f9b639f8 100644
--- a/common/placer_heap.cc
+++ b/common/placer_heap.cc
@@ -100,7 +100,8 @@ template <typename T> struct EquationSystem
     void solve(std::vector<T> &x)
     {
         using namespace Eigen;
-
+        if (x.empty())
+            return;
         NPNR_ASSERT(x.size() == A.size());
 
         VectorXd vx(x.size()), vb(rhs.size());
diff --git a/tests b/tests
index 32a68307..fb53a973 160000
--- a/tests
+++ b/tests
@@ -1 +1 @@
-Subproject commit 32a683071758ee59d47e2c5cb29c87882993facd
+Subproject commit fb53a97322c32620385af6657596681c0044a32e
-- 
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