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Add AVX acceleration (#617)
* ggml : add AVX quantize_row_q4_0() * ggml : add AVX ggml_vec_dot_q4_0() * ggml : refactor AVX part of ggml_vec_dot_q4_0() https://github.com/ggerganov/llama.cpp/pull/617#issuecomment-1489985645
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ggml.c
153
ggml.c
@ -461,6 +461,39 @@ static inline __m128i packNibbles( __m256i bytes )
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__m128i r1 = _mm256_extracti128_si256( bytes, 1 );
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return _mm_packus_epi16( r0, r1 );
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}
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#elif __AVX__
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static inline __m128i bytesFromNibbles( const uint8_t* rsi )
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{
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// Load 8 bytes from memory
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__m128i tmp = _mm_loadu_si64( ( const __m128i* )rsi );
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// Expand bytes into uint16_t values
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__m128i bytes = _mm_cvtepu8_epi16( tmp );
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// Unpack values into individual bytes
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const __m128i lowMask = _mm_set1_epi8( 0xF );
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__m128i high = _mm_andnot_si128( lowMask, bytes );
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__m128i low = _mm_and_si128( lowMask, bytes );
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high = _mm_slli_epi16( high, 4 );
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bytes = _mm_or_si128( low, high );
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return bytes;
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}
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static inline __m128i packNibbles( __m128i bytes1, __m128i bytes2 )
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{
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// Move bits within 16-bit lanes from 0000_abcd_0000_efgh into 0000_0000_abcd_efgh
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const __m128i lowByte = _mm_set1_epi16( 0xFF );
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__m128i high = _mm_andnot_si128( lowByte, bytes1 );
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__m128i low = _mm_and_si128( lowByte, bytes1 );
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high = _mm_srli_epi16( high, 4 );
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bytes1 = _mm_or_si128( low, high );
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high = _mm_andnot_si128( lowByte, bytes2 );
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low = _mm_and_si128( lowByte, bytes2 );
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high = _mm_srli_epi16( high, 4 );
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bytes2 = _mm_or_si128( low, high );
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return _mm_packus_epi16( bytes1, bytes2);
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}
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#endif
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// method 5
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@ -660,6 +693,80 @@ static void quantize_row_q4_0(const float * restrict x, void * restrict vy, int
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__m128i res = packNibbles( i0 );
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_mm_storeu_si128( ( __m128i* )y[i].qs, res );
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}
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#elif defined(__AVX__)
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for (int i = 0; i < nb; i++) {
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// Load elements into 4 AVX vectors
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__m256 v0 = _mm256_loadu_ps( x );
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__m256 v1 = _mm256_loadu_ps( x + 8 );
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__m256 v2 = _mm256_loadu_ps( x + 16 );
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__m256 v3 = _mm256_loadu_ps( x + 24 );
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x += 32;
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// Compute max(abs(e)) for the block
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const __m256 signBit = _mm256_set1_ps( -0.0f );
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__m256 maxAbs = _mm256_andnot_ps( signBit, v0 );
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maxAbs = _mm256_max_ps( maxAbs, _mm256_andnot_ps( signBit, v1 ) );
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maxAbs = _mm256_max_ps( maxAbs, _mm256_andnot_ps( signBit, v2 ) );
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maxAbs = _mm256_max_ps( maxAbs, _mm256_andnot_ps( signBit, v3 ) );
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__m128 max4 = _mm_max_ps( _mm256_extractf128_ps( maxAbs, 1 ), _mm256_castps256_ps128( maxAbs ) );
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max4 = _mm_max_ps( max4, _mm_movehl_ps( max4, max4 ) );
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max4 = _mm_max_ss( max4, _mm_movehdup_ps( max4 ) );
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const float maxScalar = _mm_cvtss_f32( max4 );
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// Quantize these floats
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const float d = maxScalar / 7.0f;
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y[i].d = d;
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const float id = ( maxScalar != 0.0f ) ? 7.0f / maxScalar : 0.0f;
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const __m256 mul = _mm256_set1_ps( id );
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// Apply the multiplier
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v0 = _mm256_mul_ps( v0, mul );
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v1 = _mm256_mul_ps( v1, mul );
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v2 = _mm256_mul_ps( v2, mul );
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v3 = _mm256_mul_ps( v3, mul );
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// Round to nearest integer
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v0 = _mm256_round_ps( v0, _MM_ROUND_NEAREST );
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v1 = _mm256_round_ps( v1, _MM_ROUND_NEAREST );
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v2 = _mm256_round_ps( v2, _MM_ROUND_NEAREST );
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v3 = _mm256_round_ps( v3, _MM_ROUND_NEAREST );
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// Convert floats to integers
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__m256i i0 = _mm256_cvtps_epi32( v0 );
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__m256i i1 = _mm256_cvtps_epi32( v1 );
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__m256i i2 = _mm256_cvtps_epi32( v2 );
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__m256i i3 = _mm256_cvtps_epi32( v3 );
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// Since we don't have in AVX some necessary functions,
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// we split the registers in half and call AVX2 analogs from SSE
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__m128i ni0 = _mm256_castsi256_si128( i0 );
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__m128i ni1 = _mm256_extractf128_si256( i0, 1);
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__m128i ni2 = _mm256_castsi256_si128( i1 );
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__m128i ni3 = _mm256_extractf128_si256( i1, 1);
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__m128i ni4 = _mm256_castsi256_si128( i2 );
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__m128i ni5 = _mm256_extractf128_si256( i2, 1);
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__m128i ni6 = _mm256_castsi256_si128( i3 );
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__m128i ni7 = _mm256_extractf128_si256( i3, 1);
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// Convert int32 to int16
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ni0 = _mm_packs_epi32( ni0, ni1 );
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ni2 = _mm_packs_epi32( ni2, ni3 );
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ni4 = _mm_packs_epi32( ni4, ni5 );
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ni6 = _mm_packs_epi32( ni6, ni7 );
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// Convert int16 to int8
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ni0 = _mm_packs_epi16( ni0, ni2 );
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ni4 = _mm_packs_epi16( ni4, ni6 );
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// Apply offset to translate the range from [ -7 .. +7 ] into [ +1 .. +15 ]
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const __m128i off = _mm_set1_epi8( 8);
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ni0 = _mm_add_epi8( ni0, off );
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ni4 = _mm_add_epi8( ni4, off );
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// Compress the vector into 4 bit/value, and store
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__m128i res = packNibbles( ni0, ni4 );
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_mm_storeu_si128( ( __m128i* )y[i].qs, res );
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}
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#elif defined(__wasm_simd128__)
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for (int i = 0; i < nb; i++) {
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float amax = 0.0f; // absolute max
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@ -1892,6 +1999,52 @@ static void ggml_vec_dot_q4_0(const int n, float * restrict s, const void * rest
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res = _mm_add_ps( res, _mm_movehl_ps( res, res ) );
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res = _mm_add_ss( res, _mm_movehdup_ps( res ) );
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sumf = _mm_cvtss_f32( res );
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#elif defined(__AVX__)
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// Initialize accumulator with zeros
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__m256 acc = _mm256_setzero_ps();
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// Main loop
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for (int i = 0; i < nb; ++i) {
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// Compute combined scale for the block
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const __m256 d = _mm256_mul_ps( _mm256_broadcast_ss( &x[i].d ), _mm256_broadcast_ss( &y[i].d ) );
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__m128i i32[2];
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for (int j = 0; j < 2; ++j) {
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// Load 8 bytes, and unpack 4 bit fields into bytes, making 16 bytes
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__m128i bx = bytesFromNibbles( x[i].qs + 8*j );
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__m128i by = bytesFromNibbles( y[i].qs + 8*j );
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// Now we have a vector with bytes in [ 0 .. 15 ] interval. Offset them into [ -8 .. +7 ] interval.
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const __m128i off = _mm_set1_epi8( 8 );
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bx = _mm_sub_epi8( bx, off );
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by = _mm_sub_epi8( by, off );
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// Get absolute values of x vectors
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const __m128i ax = _mm_sign_epi8(bx, bx);
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// Sign the values of the y vectors
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const __m128i sy = _mm_sign_epi8(by, bx);
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// Perform multiplication and create 16-bit values
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const __m128i dot = _mm_maddubs_epi16(ax, sy);
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const __m128i ones = _mm_set1_epi16(1);
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i32[j] = _mm_madd_epi16(ones, dot);
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}
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// Convert int32_t to float
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__m256 p = _mm256_cvtepi32_ps( _mm256_set_m128i( i32[0], i32[1] ));
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// Apply the scale, and accumulate
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acc = _mm256_add_ps(_mm256_mul_ps( d, p ), acc);
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}
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// Return horizontal sum of the acc vector
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__m128 res = _mm256_extractf128_ps( acc, 1 );
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res = _mm_add_ps( res, _mm256_castps256_ps128( acc ) );
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res = _mm_add_ps( res, _mm_movehl_ps( res, res ) );
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res = _mm_add_ss( res, _mm_movehdup_ps( res ) );
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sumf = _mm_cvtss_f32( res );
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#elif defined(__wasm_simd128__)
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// wasm simd
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