From fc87e2cbaa65e7e93a2c695ce5a9dc048a64a985 Mon Sep 17 00:00:00 2001
From: Rasmus Munk Larsen <rmlarsen@google.com>
Date: Thu, 10 Jun 2021 19:18:50 -0700
Subject: Use bit_cast to create -0.0 for floating point types to avoid
 compiler optimization changing sign with --ffast-math enabled.

---
 Eigen/src/Core/arch/ZVector/PacketMath.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'Eigen/src/Core/arch/ZVector')

diff --git a/Eigen/src/Core/arch/ZVector/PacketMath.h b/Eigen/src/Core/arch/ZVector/PacketMath.h
index b10c1f6c7..2246439cc 100755
--- a/Eigen/src/Core/arch/ZVector/PacketMath.h
+++ b/Eigen/src/Core/arch/ZVector/PacketMath.h
@@ -94,8 +94,9 @@ static _EIGEN_DECLARE_CONST_FAST_Packet2d(ZERO, 0);
 static _EIGEN_DECLARE_CONST_FAST_Packet2l(ZERO, 0);
 static _EIGEN_DECLARE_CONST_FAST_Packet2l(ONE, 1);
 
-static Packet2d p2d_ONE = { 1.0, 1.0 }; 
-static Packet2d p2d_ZERO_ = { -0.0, -0.0 };
+static Packet2d p2d_ONE = { 1.0, 1.0 };
+static Packet2d p2d_ZERO_ = { numext::bit_cast<double>0x8000000000000000ull),
+                              numext::bit_cast<double>0x8000000000000000ull) };
 
 #if !defined(__ARCH__) || (defined(__ARCH__) && __ARCH__ >= 12)
 #define _EIGEN_DECLARE_CONST_FAST_Packet4f(NAME,X) \
-- 
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