diff options
| author |  Antonio Sanchez <cantonios@google.com> | 2021-02-12 11:32:29 -0800 |
|---|---|---|
| committer |  Rasmus Munk Larsen <rmlarsen@google.com> | 2021-02-17 02:23:24 +0000 |
| commit | 7ff0b7a980ceffe7d0e72ebac924f514f7874e9b (patch) | |
| tree | 4022a25c9e1c909aff3f43b978a4a5d5ce0a1c47 /Eigen/src/Core/arch/AVX512 | |
| parent | 9ad4096ccb75dd5c5dd882576d49d48475afa300 (diff) | |
Updated pfrexp implementation.
The original implementation fails for 0, denormals, inf, and NaN.
See #2150
Diffstat (limited to 'Eigen/src/Core/arch/AVX512')
| -rw-r--r-- | Eigen/src/Core/arch/AVX512/PacketMath.h | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/Eigen/src/Core/arch/AVX512/PacketMath.h b/Eigen/src/Core/arch/AVX512/PacketMath.h index b9e9fdbfd..f8741372d 100644 --- a/Eigen/src/Core/arch/AVX512/PacketMath.h +++ b/Eigen/src/Core/arch/AVX512/PacketMath.h @@ -895,25 +895,28 @@ EIGEN_STRONG_INLINE Packet8d pabs(const Packet8d& a) { template<> EIGEN_STRONG_INLINE Packet16f pfrexp<Packet16f>(const Packet16f& a, Packet16f& exponent){ - return pfrexp_float(a, exponent); + return pfrexp_generic(a, exponent); +} + +// Extract exponent without existence of Packet8l. +template<> +EIGEN_STRONG_INLINE +Packet8d pfrexp_generic_get_biased_exponent(const Packet8d& a) { + const Packet8d cst_exp_mask = pset1frombits<Packet8d>(static_cast<uint64_t>(0x7ff0000000000000ull)); + #ifdef EIGEN_VECTORIZE_AVX512DQ + return _mm512_cvtepi64_pd(_mm512_srli_epi64(_mm512_castpd_si512(pand(a, cst_exp_mask)), 52)); + #else + return _mm512_cvtepi32_pd(_mm512_cvtepi64_epi32(_mm512_srli_epi64(_mm512_castpd_si512(pand(a, cst_exp_mask)), 52))); + #endif } template<> EIGEN_STRONG_INLINE Packet8d pfrexp<Packet8d>(const Packet8d& a, Packet8d& exponent) { - const Packet8d cst_1022d = pset1<Packet8d>(1022.0); -#ifdef EIGEN_TEST_AVX512DQ - exponent = psub(_mm512_cvtepi64_pd(_mm512_srli_epi64(_mm512_castpd_si512(a), 52)), cst_1022d); -#else - exponent = psub(_mm512_cvtepi32_pd(_mm512_cvtepi64_epi32(_mm512_srli_epi64(_mm512_castpd_si512(a), 52))), - cst_1022d); -#endif - const Packet8d cst_half = pset1<Packet8d>(0.5); - const Packet8d cst_inv_mant_mask = pset1frombits<Packet8d>(static_cast<uint64_t>(~0x7ff0000000000000ull)); - return por(pand(a, cst_inv_mant_mask), cst_half); + return pfrexp_generic(a, exponent); } template<> EIGEN_STRONG_INLINE Packet16f pldexp<Packet16f>(const Packet16f& a, const Packet16f& exponent) { - return pldexp_float(a,exponent); + return pldexp_generic(a, exponent); } template<> EIGEN_STRONG_INLINE Packet8d pldexp<Packet8d>(const Packet8d& a, const Packet8d& exponent) { |