From 871e2e5339476ae3f7efe63a0156507fd10c73d7 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Sun, 3 Feb 2019 08:54:47 +0100
Subject: [PATCH] bug #1674: disable GCC's unsafe-math-optimizations in sin/cos
 vectorization (results are completely wrong otherwise)

---
 Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h b/Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
index ce3f0fc68..693dd55ea 100644
--- a/Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
+++ b/Eigen/src/Core/arch/Default/GenericPacketMathFunctions.h
@@ -319,6 +319,9 @@ inline float trig_reduce_huge (float xf, int *quadrant)
 template<bool ComputeSine,typename Packet>
 EIGEN_DEFINE_FUNCTION_ALLOWING_MULTIPLE_DEFINITIONS
 EIGEN_UNUSED
+#if EIGEN_GNUC_AT_LEAST(4,4)
+__attribute__((optimize("-fno-unsafe-math-optimizations")))
+#endif
 Packet psincos_float(const Packet& _x)
 {
   typedef typename unpacket_traits<Packet>::integer_packet PacketI;