From fbf415c547bc9ee328f2afa58b0ebcee31b8f57c Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Fri, 20 Mar 2009 10:03:24 +0000
Subject: add vectorization of unary operator-() (the AltiVec version is
 probably broken)

---
 Eigen/src/Core/Functors.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'Eigen/src/Core/Functors.h')

diff --git a/Eigen/src/Core/Functors.h b/Eigen/src/Core/Functors.h
index 7940baa0b..f411a254b 100644
--- a/Eigen/src/Core/Functors.h
+++ b/Eigen/src/Core/Functors.h
@@ -190,10 +190,16 @@ struct ei_functor_traits<ei_scalar_quotient_op<Scalar> > {
   */
 template<typename Scalar> struct ei_scalar_opposite_op EIGEN_EMPTY_STRUCT {
   EIGEN_STRONG_INLINE const Scalar operator() (const Scalar& a) const { return -a; }
+  template<typename PacketScalar>
+  EIGEN_STRONG_INLINE const PacketScalar packetOp(const PacketScalar& a) const
+  { return ei_pnegate(a); }
 };
 template<typename Scalar>
 struct ei_functor_traits<ei_scalar_opposite_op<Scalar> >
-{ enum { Cost = NumTraits<Scalar>::AddCost, PacketAccess = false }; };
+{ enum {
+    Cost = NumTraits<Scalar>::AddCost,
+    PacketAccess = int(ei_packet_traits<Scalar>::size)>1 };
+};
 
 /** \internal
   * \brief Template functor to compute the absolute value of a scalar
-- 
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