From 4141d1fd2d388c1d624746b872da16cc073443ba Mon Sep 17 00:00:00 2001
From: Rasmus Munk Larsen <4643818-rmlarsen1@users.noreply.gitlab.com>
Date: Thu, 19 Feb 2026 15:56:16 -0800
Subject: [PATCH] Fix -Wtautological-overlap-compare warning in row-major GEMV
 dispatch

libeigen/eigen!2158

Co-authored-by: Rasmus Munk Larsen <rmlarsen@gmail.com>
---
 Eigen/src/Core/products/GeneralMatrixVector.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Eigen/src/Core/products/GeneralMatrixVector.h b/Eigen/src/Core/products/GeneralMatrixVector.h
index 167669245..0b4957f76 100644
--- a/Eigen/src/Core/products/GeneralMatrixVector.h
+++ b/Eigen/src/Core/products/GeneralMatrixVector.h
@@ -334,9 +334,10 @@ general_matrix_vector_product<Index, LhsScalar, LhsMapper, RowMajor, ConjugateLh
         ((int)QuarterTraits::LhsPacketSize < (int)HalfTraits::LhsPacketSize)
             ? (int)QuarterTraits::LhsPacketSize
             : (((int)HalfTraits::LhsPacketSize < (int)Traits::LhsPacketSize) ? (int)HalfTraits::LhsPacketSize
-                                                                             : (int)Traits::LhsPacketSize)
+                                                                             : (int)Traits::LhsPacketSize),
+    HasSubPackets_ = (int)MinUsefulCols_ < (int)LhsPacketSize_
   };
-  if (cols >= MinUsefulCols_ && cols < LhsPacketSize_) {
+  if (HasSubPackets_ && cols >= MinUsefulCols_ && cols < LhsPacketSize_) {
     run_small_cols(rows, cols, alhs, rhs, res, resIncr, alpha);
     return;
   }