From 5a3ebda36b17f8de0efd0459515f4fa1050184ec Mon Sep 17 00:00:00 2001
From: Rasmus Munk Larsen <rmlarsen@google.com>
Date: Tue, 26 Nov 2019 16:18:29 -0800
Subject: [PATCH] Fix warning due to missing cast for exponent arguments for
 std::frexp and std::lexp.

---
 Eigen/src/Core/GenericPacketMath.h | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/Eigen/src/Core/GenericPacketMath.h b/Eigen/src/Core/GenericPacketMath.h
index d2c2027ff..8ffc684f2 100644
--- a/Eigen/src/Core/GenericPacketMath.h
+++ b/Eigen/src/Core/GenericPacketMath.h
@@ -244,14 +244,19 @@ pshiftleft(const long int& a) { return a << N; }
 /** \internal \returns the significant and exponent of the underlying floating point numbers
   * See https://en.cppreference.com/w/cpp/numeric/math/frexp
   */
-template<typename Packet> EIGEN_DEVICE_FUNC inline Packet
-pfrexp(const Packet &a, Packet &exponent) { return std::frexp(a,&exponent); }
+template <typename Packet>
+EIGEN_DEVICE_FUNC inline Packet pfrexp(const Packet& a, Packet& exponent) {
+  int exp;
+  Packet result = std::frexp(a, &exp);
+  exponent = static_cast<Packet>(exp);
+  return result;
+}
 
 /** \internal \returns a * 2^exponent
   * See https://en.cppreference.com/w/cpp/numeric/math/ldexp
   */
 template<typename Packet> EIGEN_DEVICE_FUNC inline Packet
-pldexp(const Packet &a, const Packet &exponent) { return std::ldexp(a,exponent); }
+pldexp(const Packet &a, const Packet &exponent) { return std::ldexp(a, static_cast<int>(exponent)); }
 
 /** \internal \returns zeros */
 template<typename Packet> EIGEN_DEVICE_FUNC inline Packet
@@ -259,7 +264,7 @@ pzero(const Packet& a) { return pxor(a,a); }
 
 template<> EIGEN_DEVICE_FUNC inline float pzero<float>(const float& a) {
   EIGEN_UNUSED_VARIABLE(a);
-  return 0.;
+  return 0.f;
 }
 
 template<> EIGEN_DEVICE_FUNC inline double pzero<double>(const double& a) {