From 22dd368ea059586de26ceebe77eaf52f3cae02e8 Mon Sep 17 00:00:00 2001
From: Mark Borgerding <mark@borgerding.net>
Date: Thu, 10 Dec 2015 16:14:29 -0500
Subject: [PATCH] sign(complex) compiles for GPU

---
 Eigen/src/Core/functors/UnaryFunctors.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Eigen/src/Core/functors/UnaryFunctors.h b/Eigen/src/Core/functors/UnaryFunctors.h
index e6c665fb6..e630acc38 100644
--- a/Eigen/src/Core/functors/UnaryFunctors.h
+++ b/Eigen/src/Core/functors/UnaryFunctors.h
@@ -676,8 +676,13 @@ struct scalar_sign_op<Scalar,true> {
   EIGEN_EMPTY_STRUCT_CTOR(scalar_sign_op)
   EIGEN_DEVICE_FUNC inline const Scalar operator() (const Scalar& a) const 
   {
-      typename NumTraits<Scalar>::Real aa = std::abs(a);
-      return (aa==0) ?  Scalar(0) : (a/aa); 
+    using std::abs;
+    typedef typename NumTraits<Scalar>::Real real_type;
+    real_type aa = abs(a);
+    if (aa==0)
+      return Scalar(0); 
+    aa = 1./aa; 
+    return Scalar(real(a)*aa, imag(a)*aa );
   }
   //TODO
   //template <typename Packet>