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Avoid using horizontal adds since they're not very efficient.

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This commit is contained in:
Benoit Steiner 2016-12-21 20:55:07 -08:00
parent d7825b6707
commit 354baa0fb1
1 changed files with 4 additions and 6 deletions
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10
Eigen/src/Core/arch/AVX512/PacketMath.h
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@ -628,8 +628,8 @@ EIGEN_STRONG_INLINE Packet8d pabs(const Packet8d& a) {
#ifdef EIGEN_VECTORIZE_AVX512DQ
// AVX512F does not define _mm512_extractf32x8_ps to extract _m256 from _m512
#define EIGEN_EXTRACT_8f_FROM_16f(INPUT, OUTPUT) \
__m256 OUTPUT##_0 = _mm512_extractf32x8_ps(INPUT, 0) __m256 OUTPUT##_1 = \
_mm512_extractf32x8_ps(INPUT, 1)
__m256 OUTPUT##_0 = _mm512_extractf32x8_ps(INPUT, 0); \
__m256 OUTPUT##_1 = _mm512_extractf32x8_ps(INPUT, 1)
#else
#define EIGEN_EXTRACT_8f_FROM_16f(INPUT, OUTPUT) \
__m256 OUTPUT##_0 = _mm256_insertf128_ps( \
@ -847,10 +847,8 @@ EIGEN_STRONG_INLINE float predux<Packet16f>(const Packet16f& a) {
#ifdef EIGEN_VECTORIZE_AVX512DQ
__m256 lane0 = _mm512_extractf32x8_ps(a, 0);
__m256 lane1 = _mm512_extractf32x8_ps(a, 1);
__m256 sum = _mm256_add_ps(lane0, lane1);
__m256 tmp0 = _mm256_hadd_ps(sum, _mm256_permute2f128_ps(a, a, 1));
tmp0 = _mm256_hadd_ps(tmp0, tmp0);
return _mm_cvtss_f32(_mm256_castps256_ps128(_mm256_hadd_ps(tmp0, tmp0)));
Packet8f x = _mm256_add_ps(lane0, lane1);
return predux<Packet8f>(x);
#else
__m128 lane0 = _mm512_extractf32x4_ps(a, 0);
__m128 lane1 = _mm512_extractf32x4_ps(a, 1);