From 9099c5eac756ff44cf901b4cd31e08ad2efda46b Mon Sep 17 00:00:00 2001
From: Charles Schlosser <cs.schlosser@gmail.com>
Date: Sun, 14 Apr 2024 16:41:23 +0000
Subject: [PATCH] Handle missing AVX512 intrinsic

---
 Eigen/src/Core/arch/AVX512/PacketMath.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Eigen/src/Core/arch/AVX512/PacketMath.h b/Eigen/src/Core/arch/AVX512/PacketMath.h
index 5c535567b..794a2a0c5 100644
--- a/Eigen/src/Core/arch/AVX512/PacketMath.h
+++ b/Eigen/src/Core/arch/AVX512/PacketMath.h
@@ -1285,7 +1285,11 @@ EIGEN_STRONG_INLINE int64_t pfirst<Packet8l>(const Packet8l& a) {
 }
 template <>
 EIGEN_STRONG_INLINE int pfirst<Packet16i>(const Packet16i& a) {
+#if EIGEN_GNUC_STRICT_LESS_THAN(11, 0, 0)
+  return _mm_cvtsi128_si32(_mm512_castsi512_si128(a));
+#else
   return _mm512_cvtsi512_si32(a);
+#endif
 }
 
 template <>