bug #1424: add numext::abs specialization for unsigned integer types.

1 files changed, 9 insertions, 1 deletions

diff --git a/Eigen/src/Core/MathFunctions.h b/Eigen/src/Core/MathFunctions.h
index 5ec6c395e..0be4a25da 100644
--- a/Eigen/src/Core/MathFunctions.h
+++ b/Eigen/src/Core/MathFunctions.h
@@ -1232,11 +1232,19 @@ double log(const double &x) { return ::log(x); }
 
 template<typename T>
 EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
-typename NumTraits<T>::Real abs(const T &x) {
+typename internal::enable_if<NumTraits<T>::IsSigned || NumTraits<T>::IsComplex,typename NumTraits<T>::Real>::type
+abs(const T &x) {
   EIGEN_USING_STD_MATH(abs);
   return abs(x);
 }
 
+template<typename T>
+EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
+typename internal::enable_if<!(NumTraits<T>::IsSigned || NumTraits<T>::IsComplex),typename NumTraits<T>::Real>::type
+abs(const T &x) {
+  return x;
+}
+
 #if defined(__SYCL_DEVICE_ONLY__)
 EIGEN_ALWAYS_INLINE float   abs(float x) { return cl::sycl::fabs(x); }
 EIGEN_ALWAYS_INLINE double  abs(double x) { return cl::sycl::fabs(x); }