From 0612768c1c12b46a9a529c9c1b52e2c7493ac641 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Sun, 27 Feb 2011 21:59:07 -0500
Subject: [PATCH] fix bug #201: Clang too has intrinsics bugs preventing us to
 use custom unaligned loads

---
 Eigen/src/Core/arch/SSE/PacketMath.h | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/Eigen/src/Core/arch/SSE/PacketMath.h b/Eigen/src/Core/arch/SSE/PacketMath.h
index 6e57bfe98..d9c0c9812 100644
--- a/Eigen/src/Core/arch/SSE/PacketMath.h
+++ b/Eigen/src/Core/arch/SSE/PacketMath.h
@@ -245,10 +245,21 @@ template<> EIGEN_STRONG_INLINE Packet4i pload<Packet4i>(const int*     from) { E
 // a correct instruction dependency.
 // TODO: do the same for MSVC (ICC is compatible)
 // NOTE: with the code below, MSVC's compiler crashes!
+
+#if defined(__GNUC__) && defined(__i386__)
+  // bug 195: gcc/i386 emits weird x87 fldl/fstpl instructions for _mm_load_sd
+  #define EIGEN_AVOID_CUSTOM_UNALIGNED_LOADS 1
+#elif defined(__clang__)
+  // bug 201: Segfaults in __mm_loadh_pd with clang 2.8
+  #define EIGEN_AVOID_CUSTOM_UNALIGNED_LOADS 1
+#else
+  #define EIGEN_AVOID_CUSTOM_UNALIGNED_LOADS 0
+#endif
+
 template<> EIGEN_STRONG_INLINE Packet4f ploadu<Packet4f>(const float* from)
 {
   EIGEN_DEBUG_UNALIGNED_LOAD
-#if defined(__GNUC__) && defined(__i386__)
+#if EIGEN_AVOID_CUSTOM_UNALIGNED_LOADS
   // bug 195: gcc/i386 emits weird x87 fldl/fstpl instructions for _mm_load_sd
   return _mm_loadu_ps(from);
 #else
@@ -261,7 +272,7 @@ template<> EIGEN_STRONG_INLINE Packet4f ploadu<Packet4f>(const float* from)
 template<> EIGEN_STRONG_INLINE Packet2d ploadu<Packet2d>(const double* from)
 {
   EIGEN_DEBUG_UNALIGNED_LOAD
-#if defined(__GNUC__) && defined(__i386__)
+#if EIGEN_AVOID_CUSTOM_UNALIGNED_LOADS
   // bug 195: gcc/i386 emits weird x87 fldl/fstpl instructions for _mm_load_sd
   return _mm_loadu_pd(from);
 #else
@@ -274,7 +285,7 @@ template<> EIGEN_STRONG_INLINE Packet2d ploadu<Packet2d>(const double* from)
 template<> EIGEN_STRONG_INLINE Packet4i ploadu<Packet4i>(const int* from)
 {
   EIGEN_DEBUG_UNALIGNED_LOAD
-#if defined(__GNUC__) && defined(__i386__)
+#if EIGEN_AVOID_CUSTOM_UNALIGNED_LOADS
   // bug 195: gcc/i386 emits weird x87 fldl/fstpl instructions for _mm_load_sd
   return _mm_loadu_si128(reinterpret_cast<const Packet4i*>(from));
 #else