From 93ec5450cb869a3957b05fecfc844df94c699860 Mon Sep 17 00:00:00 2001
From: Charles Schlosser <cs.schlosser@gmail.com>
Date: Tue, 19 Nov 2024 01:38:48 +0000
Subject: [PATCH] disable fill_n optimization for msvc

---
 Eigen/src/Core/AssignEvaluator.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Eigen/src/Core/AssignEvaluator.h b/Eigen/src/Core/AssignEvaluator.h
index f7f0b238b..f40b2f433 100644
--- a/Eigen/src/Core/AssignEvaluator.h
+++ b/Eigen/src/Core/AssignEvaluator.h
@@ -738,6 +738,7 @@ EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE EIGEN_CONSTEXPR void call_dense_assignment
 }
 
 // Specialization for filling the destination with a constant value.
+#if !EIGEN_COMP_MSVC
 #ifndef EIGEN_GPU_COMPILE_PHASE
 template <typename DstXprType>
 EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void call_dense_assignment_loop(
@@ -748,6 +749,7 @@ EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void call_dense_assignment_loop(
   std::fill_n(dst.data(), dst.size(), src.functor()());
 }
 #endif
+#endif
 
 template <typename DstXprType, typename SrcXprType>
 EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void call_dense_assignment_loop(DstXprType& dst, const SrcXprType& src) {