_ak_simd_avx2_8h

Wwise SDK 2019.2.15

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 // AkSimdAvx2.h

 /// \file 

 /// AKSIMD - AVX2 implementation

 #ifndef _AK_SIMD_AVX2_H_

 #define _AK_SIMD_AVX2_H_

 #include <AK/SoundEngine/Common/AkTypes.h>

 #include <AK/SoundEngine/Platforms/SSE/AkSimd.h>

 #if !defined(__AVX2__)

 #error "Inclusion of AkSimdAvx2.h requires AVX2 instruction sets to be defined on platform"

 #endif

 #include <AK/SoundEngine/Platforms/SSE/AkSimdAvx.h>

 ////////////////////////////////////////////////////////////////////////

 /// @name AKSIMD arithmetic

 //@{

 /// Cross-platform SIMD multiplication of 8 complex data elements with interleaved real and imaginary parts, 

 /// and taking advantage of fused-multiply-add instructions

 static AkForceInline AKSIMD_V8F32 AKSIMD_COMPLEXMUL_AVX2(const AKSIMD_V8F32 cIn1, const AKSIMD_V8F32 cIn2)

 {

     __m256 real1Ext = _mm256_moveldup_ps(cIn1);             // reals extended       (a3, a3, a2, a2, a1, a1, a0, a0) 

     __m256 in2Shuf = _mm256_shuffle_ps(cIn2, cIn2, 0xB1);       // shuf multiplicand    (c3, d3, c2, d2, c1, d1, c0, d0)

     __m256 imag1Ext = _mm256_movehdup_ps(cIn1);             // multiplier imag      (b3, b3, b2, b2, b1, b1, b0, b0) 

     __m256 temp = _mm256_mul_ps(imag1Ext, in2Shuf);             // temp             (b3c3, b3d3, b2c2, b2d2, b1c1, b1d1, b0c0, b0d0)

     __m256 out = _mm256_fmaddsub_ps(real1Ext, cIn2, temp); // final             (a3d3+b3c3, a3c3-b3d3, a2d2+b2c2, a2c2-b2d2, a1d1+b1c1, a1c1-b1d1, a0d0+b0c0, a0c0-b0d0)

     return out;

 }

 //@}

 ////////////////////////////////////////////////////////////////////////

 ////////////////////////////////////////////////////////////////////////

 /// @name AKSIMD shuffling

 //@{

 /// For each 8b value in a, move it to the designated location in each 128b lane specified by the

 /// corresponding control byte in b (or, if the control byte is >=16, set the dest to zero) (see _mm_shuffle_epi8)

 #define AKSIMD_SHUFFLEB_V8I32(a, b) _mm256_shuffle_epi8(a, b)

 /// For each 16b integer, select one of the values from a and b using the provided control mask - if the 

 /// nth bit is false, the nth value from a will be selected; if true, the value from b will be selected.

 /// (the mask applies to each 128b lane identically)

 #define AKSIMD_BLEND_V16I16(a, b, i) _mm256_blend_epi16(a, b, i)

 #define AKSIMD_INSERT_V2I128( a, m128, idx) _mm256_inserti128_si256(a, m128, idx)

 /// For each 128b lane, select one of the four input 128b lanes across a and b,

 /// based on the mask i. AKSIMD_SHUFFLE can still be directly used as a control

 #define AKSIMD_PERMUTE_2X128_V8I32( a, b, i ) _mm256_permute2x128_si256(a, b, i)

 /// Selects the lower of each of the 128b lanes in a and b to be the result ( B A ), ( D C ) -> ( C A )

 #define AKSIMD_DEINTERLEAVELANES_LO_V8I32( a, b ) AKSIMD_PERMUTE_2X128_V8I32(a, b, AKSIMD_PERMUTE128(2, 0))

 /// Selects the higher of each of the 128b lanes in a and b to be the result ( B A ), ( D C) -> ( D B )

 #define AKSIMD_DEINTERLEAVELANES_HI_V8I32( a, b ) AKSIMD_PERMUTE_2X128_V8I32(a, b, AKSIMD_PERMUTE128(3, 1))

 //@}

 ////////////////////////////////////////////////////////////////////////

 ////////////////////////////////////////////////////////////////////////

 /// @name AKSIMD conversion

 //@{

 /// Converts the eight signed 16b integer values of a to signed 32-bit integer values

 #define AKSIMD_CONVERT_V8I16_TO_V8I32( __vec__ ) _mm256_cvtepi16_epi32( (__vec__) )

 //@}

 ////////////////////////////////////////////////////////////////////////

 ////////////////////////////////////////////////////////////////////////

 /// @name AKSIMD integer arithmetic

 //@{

 /// Adds the eight integer values of a and b

 #define AKSIMD_ADD_V8I32( a, b ) _mm256_add_epi32( a, b )

 #define AKSIMD_CMPLT_V8I32( a, b ) _mm256_cmpgt_epi32( b, a )

 #define AKSIMD_CMPGT_V8I32( a, b ) _mm256_cmpgt_epi32( a, b )

 #define AKSIMD_OR_V8I32( a, b ) _mm256_or_si256(a,b)

 #define AKSIMD_XOR_V8I32( a, b ) _mm256_xor_si256(a,b)

 #define AKSIMD_SUB_V8I32( a, b ) _mm256_sub_epi32(a,b)

 /// Computes the bitwise AND of the 256-bit value in a and the

 /// 256-bit value in b (see _mm_and_si128)

 #define AKSIMD_AND_V8I32( __a__, __b__ ) _mm256_and_si256( (__a__), (__b__) )

 /// Multiplies each 32-bit int value of a by b and returns the lower 32b of the result (no overflow or clamp)

 #define AKSIMD_MULLO_V8I32( a , b) _mm256_mullo_epi32(a, b)

 /// Multiplies the low 16bits of a by b and stores it in V8I32 (no overflow)

 #define AKSIMD_MULLO16_V8I32( a , b) _mm256_mullo_epi16(a, b)

 /// Subtracts each 16b integer of a by b

 #define AKSIMD_SUB_V16I16( a, b ) _mm256_sub_epi16( a, b )

 /// Compares the 16 signed 16-bit integers in a and the 16 signed

 /// 16-bit integers in b for greater than (see _mm_cmpgt_epi16)

 #define AKSIMD_CMPGT_V16I16( __a__, __b__ ) _mm256_cmpgt_epi16( (__a__), (__b__) )

 //@}

 ////////////////////////////////////////////////////////////////////////

 ////////////////////////////////////////////////////////////////////////

 /// @name AKSIMD packing / unpacking

 //@{

 /// Interleaves the lower 4 signed or unsigned 16-bit integers in each lane of a

 /// with the lower 4 signed or unsigned 16-bit integers in each lane of b

 /// (see _mm_unpacklo_epi16)

 #define AKSIMD_UNPACKLO_VECTOR16I16( a, b ) _mm256_unpacklo_epi16( a, b )

 /// Interleaves the upper 8 signed or unsigned 16-bit integers in each lane of a

 /// with the upper 8 signed or unsigned 16-bit integers in each lane of b

 /// (see _mm_unpackhi_epi16)

 #define AKSIMD_UNPACKHI_VECTOR16I16( a, b ) _mm256_unpackhi_epi16( a, b )

 /// Packs the 8 signed 32-bit integers from a and b into 16 signed 16-bit

 /// integers and saturates (see _mm_packs_epi32)

 #define AKSIMD_PACKS_V8I32( a, b ) _mm256_packs_epi32( a, b )

 //@}

 ////////////////////////////////////////////////////////////////////////

 ////////////////////////////////////////////////////////////////////////

 /// @name AKSIMD shifting

 //@{

 /// Shifts the 8 signed or unsigned 32-bit integers in a left by

 /// in_shiftBy bits while shifting in zeros (see _mm_slli_epi32)

 #define AKSIMD_SHIFTLEFT_V8I32( __vec__, __shiftBy__ ) \

     _mm256_slli_epi32( (__vec__), (__shiftBy__) )

 /// Shifts the 8 signed 32-bit integers in a right by in_shiftBy

 /// bits while shifting in the sign bit (see _mm_srai_epi32)

 #define AKSIMD_SHIFTRIGHTARITH_V8I32( __vec__, __shiftBy__ ) \

     _mm256_srai_epi32( (__vec__), (__shiftBy__) )

 //@}

 ////////////////////////////////////////////////////////////////////////

 ////////////////////////////////////////////////////////////////////////

 /// @name AKSIMD gather

 //@{

 /// To use these, provide a base_ptr, and an expression that calculates an

 /// array index for the provided base_ptr. The expression can be a lambda,

 /// such as follows:

 ///     AKSIMD_V8I32 viData = AKSIMD_GATHER_EPI32(src,  [uIndex, uStep](int i)

 ///         { return (uIndex + uStep * i); });

 /// This tends to perform better than a native VGATHER on most CPUs

 template <typename T, typename Function>

 inline AKSIMD_V8I32 AKSIMD_GATHER_EPI32(const T* __restrict base_ptr, Function expr)

 {

     __m256i vals = _mm256_setzero_si256();

     __m128i valsTemp[2] = { _mm_setzero_si128(),_mm_setzero_si128() };

 #define _GATHER_SIM_FETCH(_x) \

     {\

         AkInt32 val = *(AkInt32*)(base_ptr + expr(_x)); \

         valsTemp[_x/4] = _mm_insert_epi32(valsTemp[_x/4],  val, _x%4);\

     }

     _GATHER_SIM_FETCH(0);

     _GATHER_SIM_FETCH(1);

     _GATHER_SIM_FETCH(2);

     _GATHER_SIM_FETCH(3);

     _GATHER_SIM_FETCH(4);

     _GATHER_SIM_FETCH(5);

     _GATHER_SIM_FETCH(6);

     _GATHER_SIM_FETCH(7);

 #undef _GATHER_SIM_FETCH

     vals = _mm256_setr_m128i(valsTemp[0], valsTemp[1]);

     return vals;

 }

 template <typename T, typename Function>

 inline AKSIMD_V8I32 AKSIMD_GATHER_EPI64(const T* base_ptr, Function expr)

 {

     __m256i vals = _mm256_setzero_si256();

     __m128i valsTemp[2] = { _mm_setzero_si128(),_mm_setzero_si128() };

 #define _GATHER_SIM_FETCH(_x) \

     {\

         AkInt64 val = *(AkInt64*)(base_ptr + expr(_x)); \

         valsTemp[_x/2] = _mm_insert_epi64(valsTemp[_x/2],  val, _x%2);\

     }

     _GATHER_SIM_FETCH(0);

     _GATHER_SIM_FETCH(1);

     _GATHER_SIM_FETCH(2);

     _GATHER_SIM_FETCH(3);

 #undef _GATHER_SIM_FETCH

     vals = _mm256_setr_m128i(valsTemp[0], valsTemp[1]);

     return vals;

 }

 template <typename T, typename Function>

 inline AKSIMD_V8F32 AKSIMD_GATHER_PS(const T* base_ptr, Function expr)

 {

     return _mm256_castsi256_ps(AKSIMD_GATHER_EPI32(base_ptr, expr));

 }

 template <typename T, typename Function>

 inline AKSIMD_V8F32 AKSIMD_GATHER_PD(const T* base_ptr, Function expr)

 {

     return _mm256_castsi256_pd(AKSIMD_GATHER_EPI64(base_ptr, expr));

 }

 //@}

 ////////////////////////////////////////////////////////////////////////

 #endif //_AK_SIMD_AVX2_H_