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Correct pnegate for floating-point zero.

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(cherry picked from commit 8588d8c74b)
This commit is contained in:
Antonio Sánchez
2022-11-15 18:07:23 +00:00
committed by Antonio Sanchez
parent 771e91860b
commit 5547205092
4 changed files with 21 additions and 19 deletions
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6
Eigen/src/Core/arch/AVX/PacketMath.h
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@@ -285,11 +285,13 @@ template<> EIGEN_STRONG_INLINE Packet8i psub<Packet8i>(const Packet8i& a, const
template<> EIGEN_STRONG_INLINE Packet8f pnegate(const Packet8f& a)
{
return _mm256_sub_ps(_mm256_set1_ps(0.0),a);
const Packet8f mask = _mm256_castsi256_ps(_mm256_set1_epi32(0x80000000));
return _mm256_xor_ps(a, mask);
}
template<> EIGEN_STRONG_INLINE Packet4d pnegate(const Packet4d& a)
{
return _mm256_sub_pd(_mm256_set1_pd(0.0),a);
const Packet4d mask = _mm256_castsi256_pd(_mm256_set1_epi64x(0x8000000000000000ULL));
return _mm256_xor_pd(a, mask);
}
template<> EIGEN_STRONG_INLINE Packet8f pconj(const Packet8f& a) { return a; }

6
Eigen/src/Core/arch/AVX512/PacketMath.h
View File

@@ -296,11 +296,13 @@ EIGEN_STRONG_INLINE Packet16i psub<Packet16i>(const Packet16i& a,
template <>
EIGEN_STRONG_INLINE Packet16f pnegate(const Packet16f& a) {
return _mm512_sub_ps(_mm512_set1_ps(0.0), a);
const __m512i mask = _mm512_set1_epi32(0x80000000);
return _mm512_castsi512_ps(_mm512_xor_epi32(_mm512_castps_si512(a), mask));
}
template <>
EIGEN_STRONG_INLINE Packet8d pnegate(const Packet8d& a) {
return _mm512_sub_pd(_mm512_set1_pd(0.0), a);
const __m512i mask = _mm512_set1_epi64(0x8000000000000000ULL);
return _mm512_castsi512_pd(_mm512_xor_epi64(_mm512_castpd_si512(a), mask));
}
template <>