From 0f45292bb14babd384f29c273ee5a76c2238b07a Mon Sep 17 00:00:00 2001
From: Sandro Mani <manisandro@gmail.com>
Date: Wed, 25 Aug 2021 08:18:41 +0200
Subject: [PATCH] Temporarily disable MMA on ppc64le

---
 eigen3.spec     |  8 +++++++-
 eigen_mma.patch | 14 ++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 eigen_mma.patch

diff --git a/eigen3.spec b/eigen3.spec
index 3061ceb..a7b98f3 100644
--- a/eigen3.spec
+++ b/eigen3.spec
@@ -27,6 +27,9 @@ Summary:        A lightweight C++ template library for vector and matrix math
 License:        MPLv2.0 and LGPLv2+ and BSD and Minpack
 URL:            http://eigen.tuxfamily.org/index.php?title=Main_Page
 Source0:        https://gitlab.com/libeigen/eigen/-/archive/%{version}/eigen-%{version}.tar.bz2
+# https://bugzilla.redhat.com/show_bug.cgi?id=1996330
+# Temporarily disable EIGEN_ALTIVEC_DISABLE_MMA on PPC64le
+Patch0:         eigen_mma.patch
 
 BuildRequires:  %{blaslib}-devel
 BuildRequires:  fftw-devel
@@ -73,7 +76,10 @@ Developer documentation for Eigen.
 
 
 %prep
-%autosetup -p1 -n eigen-%{version}
+%setup -q -n eigen-%{version}
+%ifarch ppc64le
+%patch0 -p1
+%endif
 
 
 %build
diff --git a/eigen_mma.patch b/eigen_mma.patch
new file mode 100644
index 0000000..9b1932d
--- /dev/null
+++ b/eigen_mma.patch
@@ -0,0 +1,14 @@
+diff -rupN eigen-3.4.0/Eigen/src/Core/arch/AltiVec/MatrixProduct.h eigen-3.4.0-new/Eigen/src/Core/arch/AltiVec/MatrixProduct.h
+--- eigen-3.4.0/Eigen/src/Core/arch/AltiVec/MatrixProduct.h	2021-08-18 22:41:58.000000000 +0200
++++ eigen-3.4.0-new/Eigen/src/Core/arch/AltiVec/MatrixProduct.h	2021-08-22 17:37:23.626427133 +0200
+@@ -28,6 +28,9 @@
+ #endif
+ #endif
+ 
++#define EIGEN_ALTIVEC_DISABLE_MMA
++
++
+ #ifdef __has_builtin
+ #if __has_builtin(__builtin_mma_assemble_acc)
+   #define ALTIVEC_MMA_SUPPORT
+diff -rupN eigen-3.4.0/Eigen/src/Core/util/Macros.h eigen-3.4.0-new/Eigen/src/Core/util/Macros.h