From e730b1fe3323e840f56df4f8228f98f4396a27b2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antonio=20S=C3=A1nchez?= <cantonios@google.com>
Date: Thu, 26 Feb 2026 23:47:39 +0000
Subject: [PATCH] Fix mixed products GEMM.

libeigen/eigen!2224
---
 Eigen/src/Core/products/GeneralBlockPanelKernel.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Eigen/src/Core/products/GeneralBlockPanelKernel.h b/Eigen/src/Core/products/GeneralBlockPanelKernel.h
index 8adfdd6f9..f693e898d 100644
--- a/Eigen/src/Core/products/GeneralBlockPanelKernel.h
+++ b/Eigen/src/Core/products/GeneralBlockPanelKernel.h
@@ -1815,8 +1815,7 @@ EIGEN_DONT_INLINE void gemm_pack_lhs<Scalar, Index, DataMapper, Pack1, Pack2, Pa
   const Index peeled_mc_half =
       Pack1 >= HalfPacketSize ? peeled_mc1 + ((rows - peeled_mc1) / (HalfPacketSize)) * (HalfPacketSize) : 0;
   const Index peeled_mc_quarter = Pack1 >= QuarterPacketSize ? (rows / (QuarterPacketSize)) * (QuarterPacketSize) : 0;
-  const Index last_lhs_progress =
-      rows > peeled_mc_quarter ? (Pack2 > 1 ? Pack2 : ((rows - peeled_mc_quarter) & ~1)) : 0;
+  const Index last_lhs_progress = rows > peeled_mc_quarter ? (rows - peeled_mc_quarter) & ~1 : 0;
   const Index peeled_mc0 = Pack2 >= PacketSize              ? peeled_mc_quarter
                            : Pack2 > 1 && last_lhs_progress ? (rows / last_lhs_progress) * last_lhs_progress
                                                             : 0;
@@ -2032,7 +2031,7 @@ EIGEN_DONT_INLINE void gemm_pack_lhs<Scalar, Index, DataMapper, Pack1, Pack2, Pa
       // last peeling loop at this point (for the rhs).
       if (Pack2 < PacketSize && !gone_last) {
         gone_last = true;
-        psize = pack = Pack2;
+        psize = pack = left & ~1;
       }
     }
   }