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Optimized SSE unaligned loads and stores when compiling a 64bit target with a recent version of gcc (ie gcc 4.8).

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This commit is contained in:
Benoit Steiner 2014-04-14 10:44:17 -07:00
parent 3b2321e3ab
commit feaf7c7e6d
1 changed files with 8 additions and 1 deletions
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9
Eigen/src/Core/arch/SSE/PacketMath.h
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@ -271,14 +271,17 @@ template<> EIGEN_STRONG_INLINE Packet4i pload<Packet4i>(const int* from) { E
// TODO: do the same for MSVC (ICC is compatible)
// NOTE: with the code below, MSVC's compiler crashes!
#if defined(__GNUC__) && defined(__i386__)
#if defined(__GNUC__) && (defined(__i386__) || (defined(__x86_64) && EIGEN_GNUC_AT_LEAST(4, 8)))
// bug 195: gcc/i386 emits weird x87 fldl/fstpl instructions for _mm_load_sd
#define EIGEN_AVOID_CUSTOM_UNALIGNED_LOADS 1
#define EIGEN_AVOID_CUSTOM_UNALIGNED_STORES 1
#elif defined(__clang__)
// bug 201: Segfaults in __mm_loadh_pd with clang 2.8
#define EIGEN_AVOID_CUSTOM_UNALIGNED_LOADS 1
#define EIGEN_AVOID_CUSTOM_UNALIGNED_STORES 0
#else
#define EIGEN_AVOID_CUSTOM_UNALIGNED_LOADS 0
#define EIGEN_AVOID_CUSTOM_UNALIGNED_STORES 0
#endif
template<> EIGEN_STRONG_INLINE Packet4f ploadu<Packet4f>(const float* from)
@ -338,8 +341,12 @@ template<> EIGEN_STRONG_INLINE void pstore<int>(int* to, const Packet4i& f
template<> EIGEN_STRONG_INLINE void pstoreu<double>(double* to, const Packet2d& from) {
EIGEN_DEBUG_UNALIGNED_STORE
#if EIGEN_AVOID_CUSTOM_UNALIGNED_STORES
_mm_storeu_pd(to, from);
#else
_mm_storel_pd((to), from);
_mm_storeh_pd((to+1), from);
#endif
}
template<> EIGEN_STRONG_INLINE void pstoreu<float>(float* to, const Packet4f& from) { EIGEN_DEBUG_UNALIGNED_STORE pstoreu(reinterpret_cast<double*>(to), _mm_castps_pd(from)); }
template<> EIGEN_STRONG_INLINE void pstoreu<int>(int* to, const Packet4i& from) { EIGEN_DEBUG_UNALIGNED_STORE pstoreu(reinterpret_cast<double*>(to), _mm_castsi128_pd(from)); }