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 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'common')

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());
-- 
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