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bug #955 - Implement a rotating kernel alternative in the 3px4 gebp path

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This is substantially faster on ARM, where it's important to minimize the number of loads.

This is specific to the case where all packet types are of size 4. I made my best attempt to minimize how dirty this is... opinions welcome.

Eventually one could have a generic rotated kernel, but it would take some work to get there. Also, on sandy bridge, in my experience, it's not beneficial (even about 1% slower).
This commit is contained in:
Benoit Jacob
2015-02-18 15:03:35 -05:00
parent ee27d50633
commit 9bd8a4bab5
5 changed files with 133 additions and 19 deletions
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25
Eigen/src/Core/arch/NEON/PacketMath.h
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@@ -309,6 +309,23 @@ template<> EIGEN_STRONG_INLINE Packet4i preverse(const Packet4i& a) {
a_hi = vget_high_s32(a_r64);
return vcombine_s32(a_hi, a_lo);
}
template<size_t offset>
struct protate_impl<offset, Packet4f>
{
static Packet4f run(const Packet4f& a) {
return vextq_f32(a, a, offset);
}
};
template<size_t offset>
struct protate_impl<offset, Packet4i>
{
static Packet4i run(const Packet4i& a) {
return vextq_s32(a, a, offset);
}
};
template<> EIGEN_STRONG_INLINE Packet4f pabs(const Packet4f& a) { return vabsq_f32(a); }
template<> EIGEN_STRONG_INLINE Packet4i pabs(const Packet4i& a) { return vabsq_s32(a); }
@@ -625,6 +642,14 @@ template<> EIGEN_STRONG_INLINE double pfirst<Packet2d>(const Packet2d& a) { retu
template<> EIGEN_STRONG_INLINE Packet2d preverse(const Packet2d& a) { return vcombine_f64(vget_high_f64(a), vget_low_f64(a)); }
template<size_t offset>
struct protate_impl<offset, Packet2d>
{
static Packet2d run(const Packet2d& a) {
return vextq_f64(a, a, offset);
}
};
template<> EIGEN_STRONG_INLINE Packet2d pabs(const Packet2d& a) { return vabsq_f64(a); }
#if EIGEN_COMP_CLANG && defined(__apple_build_version__)