From 85b6d82b49c636364d92b732aece58949df6741d Mon Sep 17 00:00:00 2001
From: Benoit Steiner <benoit.steiner.goog@gmail.com>
Date: Mon, 1 Feb 2016 14:35:51 -0800
Subject: [PATCH] Generalized predux4 to support AVX512 packets, and renamed it
 predux_half. Disabled the implementation of pabs for avx512 since the
 corresponding intrinsics are not shipped with gcc

---
 Eigen/src/Core/GenericPacketMath.h      |  2 +-
 Eigen/src/Core/arch/AVX/PacketMath.h    |  2 +-
 Eigen/src/Core/arch/AVX512/PacketMath.h | 10 ++++++----
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/Eigen/src/Core/GenericPacketMath.h b/Eigen/src/Core/GenericPacketMath.h
index 5f27d8166..d51413e98 100644
--- a/Eigen/src/Core/GenericPacketMath.h
+++ b/Eigen/src/Core/GenericPacketMath.h
@@ -314,7 +314,7 @@ template<typename Packet> EIGEN_DEVICE_FUNC inline typename unpacket_traits<Pack
   */
 template<typename Packet> EIGEN_DEVICE_FUNC inline
 typename conditional<(unpacket_traits<Packet>::size%8)==0,typename unpacket_traits<Packet>::half,Packet>::type
-predux4(const Packet& a)
+predux_half(const Packet& a)
 { return a; }
 
 /** \internal \returns the product of the elements of \a a*/
diff --git a/Eigen/src/Core/arch/AVX/PacketMath.h b/Eigen/src/Core/arch/AVX/PacketMath.h
index 5ec325fce..7161f3867 100644
--- a/Eigen/src/Core/arch/AVX/PacketMath.h
+++ b/Eigen/src/Core/arch/AVX/PacketMath.h
@@ -401,7 +401,7 @@ template<> EIGEN_STRONG_INLINE double predux<Packet4d>(const Packet4d& a)
   return pfirst(_mm256_hadd_pd(tmp0,tmp0));
 }
 
-template<> EIGEN_STRONG_INLINE Packet4f predux4<Packet8f>(const Packet8f& a)
+template<> EIGEN_STRONG_INLINE Packet4f predux_half<Packet8f>(const Packet8f& a)
 {
   return _mm_add_ps(_mm256_castps256_ps128(a),_mm256_extractf128_ps(a,1));
 }
diff --git a/Eigen/src/Core/arch/AVX512/PacketMath.h b/Eigen/src/Core/arch/AVX512/PacketMath.h
index d3b1eea06..55d93e35b 100644
--- a/Eigen/src/Core/arch/AVX512/PacketMath.h
+++ b/Eigen/src/Core/arch/AVX512/PacketMath.h
@@ -633,11 +633,13 @@ template<> EIGEN_STRONG_INLINE Packet8d preverse(const Packet8d& a)
 
 template<> EIGEN_STRONG_INLINE Packet16f pabs(const Packet16f& a)
 {
-  return _mm512_abs_ps(a);
+  assert(false && "to be implemented");
+  //  return _mm512_abs_ps(a);
 }
 template<> EIGEN_STRONG_INLINE Packet8d pabs(const Packet8d& a)
 {
-  return _mm512_abs_pd(a);
+  assert(false && "to be implemented");
+  //  return _mm512_abs_pd(a);
 }
 
 template<> EIGEN_STRONG_INLINE Packet16f preduxp<Packet16f>(const Packet16f* vecs)
@@ -679,7 +681,7 @@ EIGEN_STRONG_INLINE double predux<Packet8d>(const Packet8d& a) {
 }
 
 template <>
-EIGEN_STRONG_INLINE Packet8f predux4<Packet16f>(const Packet16f& a) {
+EIGEN_STRONG_INLINE Packet8f predux_half<Packet16f>(const Packet16f& a) {
 #ifdef EIGEN_VECTORIZE_AVX512DQ
   Packet8f lane0 = _mm512_extractf32x8_ps(a, 0);
   Packet8f lane1 = _mm512_extractf32x8_ps(a, 1);
@@ -695,7 +697,7 @@ EIGEN_STRONG_INLINE Packet8f predux4<Packet16f>(const Packet16f& a) {
 #endif
 }
 template <>
-EIGEN_STRONG_INLINE Packet4d predux4<Packet8d>(const Packet8d& a) {
+EIGEN_STRONG_INLINE Packet4d predux_half<Packet8d>(const Packet8d& a) {
   Packet4d lane0 = _mm512_extractf64x4_pd(a, 0);
   Packet4d lane1 = _mm512_extractf64x4_pd(a, 1);
   Packet4d res = padd(lane0, lane1);