From 63dcb429cd91f7e1cdfaffb894bb368502ee0c38 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antonio=20S=C3=A1nchez?= <cantonios@google.com>
Date: Fri, 7 Jul 2023 18:37:14 +0000
Subject: [PATCH] Fix use of arg function in CUDA.

---
 Eigen/src/Core/MathFunctions.h | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/Eigen/src/Core/MathFunctions.h b/Eigen/src/Core/MathFunctions.h
index 822701bc3..55077071b 100644
--- a/Eigen/src/Core/MathFunctions.h
+++ b/Eigen/src/Core/MathFunctions.h
@@ -482,12 +482,8 @@ struct arg_default_impl<Scalar, true> {
   EIGEN_DEVICE_FUNC
   static inline RealScalar run(const Scalar& x)
   {
-    #if defined(EIGEN_HIP_DEVICE_COMPILE)
-    // HIP does not seem to have a native device side implementation for the math routine "arg"
+    // There is no official ::arg on device in CUDA/HIP, so we always need to use std::arg.
     using std::arg;
-    #else
-    EIGEN_USING_STD(arg);
-    #endif
     return static_cast<RealScalar>(arg(x));
   }
 };