src/gromacs/simd/impl_x86_avx2_256/impl_x86_avx2_256_simd_double.h

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  35
  36 #ifndef GMX_SIMD_IMPL_X86_AVX2_256_SIMD_DOUBLE_H
  37 #define GMX_SIMD_IMPL_X86_AVX2_256_SIMD_DOUBLE_H
  38
  39 #include "config.h"
  40
  41 #include <immintrin.h>
  42
  43 #include "impl_x86_avx2_256_common.h"
  44
  45 /****************************************************
  46  *      DOUBLE PRECISION SIMD IMPLEMENTATION        *
  47  ****************************************************/
  48 #undef  gmx_simd_fmadd_d
  49 #define gmx_simd_fmadd_d           _mm256_fmadd_pd
  50 #undef  gmx_simd_fmsub_d
  51 #define gmx_simd_fmsub_d           _mm256_fmsub_pd
  52 #undef  gmx_simd_fnmadd_d
  53 #define gmx_simd_fnmadd_d          _mm256_fnmadd_pd
  54 #undef  gmx_simd_fnmsub_d
  55 #define gmx_simd_fnmsub_d          _mm256_fnmsub_pd
  56 #undef  gmx_simd_get_exponent_d
  57 #define gmx_simd_get_exponent_d    gmx_simd_get_exponent_d_avx2_256
  58 #undef  gmx_simd_set_exponent_d
  59 #define gmx_simd_set_exponent_d    gmx_simd_set_exponent_d_avx2_256
  60 #undef  gmx_simd_cvt_db2dib
  61 #define gmx_simd_cvt_db2dib        gmx_simd_cvt_db2dib_avx2_256
  62 #undef  gmx_simd_cvt_dib2db
  63 #define gmx_simd_cvt_dib2db        gmx_simd_cvt_dib2db_avx2_256
  64
  65 /*********************************************************
  66  * SIMD DOUBLE PRECISION IMPLEMENTATION HELPER FUNCTIONS *
  67  *********************************************************/
  68 static gmx_inline gmx_simd_double_t gmx_simdcall
  69 gmx_simd_get_exponent_d_avx2_256(gmx_simd_double_t x)
  70 {
  71     const __m256d  expmask      = _mm256_castsi256_pd(_mm256_set1_epi64x(0x7FF0000000000000LL));
  72     const __m256i  expbias      = _mm256_set1_epi64x(1023LL);
  73     __m256i        iexp;
  74     __m128i        iexp128;
  75
  76     iexp = _mm256_castpd_si256(_mm256_and_pd(x, expmask));
  77     iexp = _mm256_sub_epi64(_mm256_srli_epi64(iexp, 52), expbias);
  78     iexp = _mm256_shuffle_epi32(iexp, _MM_SHUFFLE(3, 1, 2, 0));
  79
  80     iexp128 = _mm256_extractf128_si256(iexp, 1);
  81     iexp128 = _mm_unpacklo_epi64(_mm256_castsi256_si128(iexp), iexp128);
  82     return _mm256_cvtepi32_pd(iexp128);
  83 }
  84
  85 static gmx_inline gmx_simd_double_t gmx_simdcall
  86 gmx_simd_set_exponent_d_avx2_256(gmx_simd_double_t x)
  87 {
  88     const __m256i  expbias      = _mm256_set1_epi64x(1023LL);
  89     __m256i        iexp         = _mm256_cvtepi32_epi64(_mm256_cvtpd_epi32(x));
  90
  91     iexp = _mm256_slli_epi64(_mm256_add_epi64(iexp, expbias), 52);
  92     return _mm256_castsi256_pd(iexp);
  93 }
  94
  95 static gmx_inline gmx_simd_dibool_t gmx_simdcall
  96 gmx_simd_cvt_db2dib_avx2_256(gmx_simd_dbool_t a)
  97 {
  98     __m128i ia = _mm256_castsi256_si128(_mm256_castpd_si256(a));
  99     __m128i ib = _mm256_extractf128_si256(_mm256_castpd_si256(a), 0x1);
 100
 101     ia = _mm_packs_epi32(ia, ib);
 102
 103     return ia;
 104 }
 105
 106 static gmx_inline gmx_simd_dbool_t gmx_simdcall
 107 gmx_simd_cvt_dib2db_avx2_256(gmx_simd_dibool_t ia)
 108 {
 109     __m128d lo = _mm_castsi128_pd(_mm_unpacklo_epi32(ia, ia));
 110     __m128d hi = _mm_castsi128_pd(_mm_unpackhi_epi32(ia, ia));
 111
 112     return _mm256_insertf128_pd(_mm256_castpd128_pd256(lo), hi, 0x1);
 113 }
 114
 115 #endif /* GMX_SIMD_IMPL_X86_AVX2_256_SIMD_DOUBLE_H */