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ggml : AVX2 optimization for vec_dot_q4_3_q8_0 and refactoring (#1099)
* AVX2 optimization for vec_dot_q4_3_q8_0 and refactoring * finish AVX vectorization of quantize_row_q8_0 * Rename hsum_int_8 to hsum_i32_8
This commit is contained in:
Stephan Walter
GitHub
parent
e9a9cb0c54
commit
c5aa5e5777
1 changed files with 92 additions and 121 deletions
213
ggml.c
213
ggml.c
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@ -450,6 +450,24 @@ static inline __m128i bytes_from_nibbles_16(const uint8_t * rsi)
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return bytes;
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}
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// horizontally add 8 floats
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static inline float hsum_float_8(const __m256 x) {
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__m128 res = _mm256_extractf128_ps(x, 1);
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res = _mm_add_ps(res, _mm256_castps256_ps128(x));
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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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return _mm_cvtss_f32(res);
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}
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// horizontally add 8 int32_t
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static inline int hsum_i32_8(const __m256i a) {
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const __m128i sum128 = _mm_add_epi32(_mm256_castsi256_si128(a), _mm256_extractf128_si256(a, 1));
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const __m128i hi64 = _mm_unpackhi_epi64(sum128, sum128);
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const __m128i sum64 = _mm_add_epi32(hi64, sum128);
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const __m128i hi32 = _mm_shuffle_epi32(sum64, _MM_SHUFFLE(2, 3, 0, 1));
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return _mm_cvtsi128_si32(_mm_add_epi32(sum64, hi32));
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}
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#if __AVX2__ || __AVX512F__
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// Unpack 32 4-bit fields into 32 bytes
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// The output vector contains 32 bytes, each one in [ 0 .. 15 ] interval
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@ -470,6 +488,24 @@ static inline __m256i bytes_from_nibbles_32(const uint8_t * rsi)
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return bytes;
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}
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// add int16_t pairwise and return as float vector
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static inline __m256 sum_i16_pairs_float(const __m256i x) {
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const __m256i ones = _mm256_set1_epi16(1);
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const __m256i summed_pairs = _mm256_madd_epi16(ones, x);
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return _mm256_cvtepi32_ps(summed_pairs);
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}
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// multiply int8_t, add results pairwise twice and return as float vector
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static inline __m256 mul_sum_i8_pairs_float(const __m256i x, const __m256i y) {
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// Get absolute values of x vectors
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const __m256i ax = _mm256_sign_epi8(x, x);
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// Sign the values of the y vectors
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const __m256i sy = _mm256_sign_epi8(y, x);
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// Perform multiplication and create 16-bit values
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const __m256i dot = _mm256_maddubs_epi16(ax, sy);
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return sum_i16_pairs_float(dot);
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}
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static inline __m128i packNibbles( __m256i bytes )
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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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@ -1273,29 +1309,6 @@ static void quantize_row_q8_0_reference(const float * restrict x, block_q8_0 * r
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}
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}
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#ifdef __AVX2__
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// There is no better way of doing this?
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// I guess not, AVX is not very good at horizontal sums.
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// The commented solution for a hotrizontal sum was suggested by @pubby as being slightly
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// faster than the solution below. As I don't have an AVX2 system handt right now to test,
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// keeping the original.
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// TODO: Please try and if it does make a differece, uncomment and remove the implementation below.
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//static inline float horizontal_sum(__m256i a) {
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// __m256i b = _mm256_castps_si256(_mm256_movehdup_ps(_mm256_castsi256_ps(a)));
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// __m256i sum = _mm256_add_epi32(a, b);
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// __m256i hi = _mm256_unpackhi_epi64(sum, sum);
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// sum = _mm256_add_epi32(sum, hi);
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// return _mm256_cvtsi256_si32(sum) + _mm256_extract_epi32(sum, 4);
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//}
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static inline float horizontal_sum(__m256i a) {
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__m128i sum128 = _mm_add_epi32(_mm256_castsi256_si128(a), _mm256_extracti128_si256(a, 1));
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__m128i hi64 = _mm_unpackhi_epi64(sum128, sum128);
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__m128i sum64 = _mm_add_epi32(hi64, sum128);
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__m128i hi32 = _mm_shuffle_epi32(sum64, _MM_SHUFFLE(2, 3, 0, 1));
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return _mm_cvtsi128_si32(_mm_add_epi32(sum64, hi32));
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}
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#endif
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static void quantize_row_q8_0(const float * restrict x, void * restrict vy, int k) {
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assert(k % QK8_0 == 0);
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const int nb = k / QK8_0;
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@ -1384,9 +1397,8 @@ static void quantize_row_q8_0(const float * restrict x, void * restrict vy, int
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__m256i i3 = _mm256_cvtps_epi32( v3 );
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#if defined(__AVX2__)
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// Compute the sum of the quants and set y[i].s
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y[i].s = d * horizontal_sum(_mm256_add_epi32(_mm256_add_epi32(i0, i1), _mm256_add_epi32(i2, i3)));
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y[i].s = d * hsum_i32_8(_mm256_add_epi32(_mm256_add_epi32(i0, i1), _mm256_add_epi32(i2, i3)));
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// Convert int32 to int16
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i0 = _mm256_packs_epi32( i0, i1 ); // 0, 1, 2, 3, 8, 9, 10, 11, 4, 5, 6, 7, 12, 13, 14, 15
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@ -1413,6 +1425,11 @@ static void quantize_row_q8_0(const float * restrict x, void * restrict vy, int
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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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// Compute the sum of the quants and set y[i].s
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const __m128i s0 = _mm_add_epi32(_mm_add_epi32(ni0, ni1), _mm_add_epi32(ni2, ni3));
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const __m128i s1 = _mm_add_epi32(_mm_add_epi32(ni4, ni5), _mm_add_epi32(ni6, ni7));
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y[i].s = d * hsum_i32_8(_mm256_set_m128i(s1, s0));
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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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@ -1430,14 +1447,6 @@ static void quantize_row_q8_0(const float * restrict x, void * restrict vy, int
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// scalar
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quantize_row_q8_0_reference(x, y, k);
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#endif
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#if defined __AVX__
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// TODO: vectorize this
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for (int i=0; i<nb; ++i) {
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int sum = 0;
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for (int l=0; l<QK8_0; ++l) sum += y[i].qs[l];
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y[i].s = y[i].d * sum;
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}
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#endif
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}
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static void dequantize_row_q4_0(const void * restrict vx, float * restrict y, int k) {
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@ -2374,8 +2383,6 @@ static void ggml_vec_dot_q4_0_q8_0(const int n, float * restrict s, const void *
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const block_q4_0 * restrict x = vx;
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const block_q8_0 * restrict y = vy;
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float sumf = 0.0;
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#if defined(__ARM_NEON)
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float32x4_t sumv0 = vdupq_n_f32(0.0f);
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float32x4_t sumv1 = vdupq_n_f32(0.0f);
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@ -2441,7 +2448,7 @@ static void ggml_vec_dot_q4_0_q8_0(const int n, float * restrict s, const void *
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#endif
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}
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sumf = vaddvq_f32(sumv0) + vaddvq_f32(sumv1) - 8 * sum8;
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*s = vaddvq_f32(sumv0) + vaddvq_f32(sumv1) - 8 * sum8;
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#elif defined(__AVX2__)
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// Initialize accumulator with zeros
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__m256 acc = _mm256_setzero_ps();
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@ -2459,32 +2466,13 @@ static void ggml_vec_dot_q4_0_q8_0(const int n, float * restrict s, const void *
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__m256i by = _mm256_loadu_si256((const __m256i *)y[i].qs);
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// Get absolute values of x vectors
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const __m256i ax = _mm256_sign_epi8(bx, bx);
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// Sign the values of the y vectors
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const __m256i sy = _mm256_sign_epi8(by, bx);
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// Perform multiplication and create 16-bit values
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const __m256i dot = _mm256_maddubs_epi16(ax, sy);
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const __m256i ones = _mm256_set1_epi16(1);
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__m256i xy_q = _mm256_madd_epi16(ones, dot);
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/* Convert to vectore of 8 int32_t to 8 floats */
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__m256 q = _mm256_cvtepi32_ps( xy_q );
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const __m256 q = mul_sum_i8_pairs_float(bx, by);
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/* Multiply q with scale and accumulate */
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acc = _mm256_fmadd_ps( d, q, 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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*s = hsum_float_8(acc);
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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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@ -2523,15 +2511,10 @@ static void ggml_vec_dot_q4_0_q8_0(const int n, float * restrict s, const void *
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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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*s = hsum_float_8(acc);
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#else
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// scalar
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float sumf = 0.0;
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for (int i = 0; i < nb; i++) {
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const float d0 = x[i].d;
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const float d1 = y[i].d;
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@ -2553,9 +2536,8 @@ static void ggml_vec_dot_q4_0_q8_0(const int n, float * restrict s, const void *
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}
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sumf += d0*d1*sumi;
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}
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#endif
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*s = sumf;
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#endif
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}
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static void ggml_vec_dot_q4_1_q8_0(const int n, float * restrict s, const void * restrict vx, const void * restrict vy) {
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@ -2567,8 +2549,6 @@ static void ggml_vec_dot_q4_1_q8_0(const int n, float * restrict s, const void *
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const block_q4_1 * restrict x = vx;
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const block_q8_0 * restrict y = vy;
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float sumf = 0.0;
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// TODO: add AVX / WASM SIMD / etc
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#if defined(__ARM_NEON)
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float32x4_t sumv0 = vdupq_n_f32(0.0f);
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@ -2635,7 +2615,7 @@ static void ggml_vec_dot_q4_1_q8_0(const int n, float * restrict s, const void *
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#endif
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}
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sumf = vaddvq_f32(sumv0) + vaddvq_f32(sumv1) + summs;
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*s = vaddvq_f32(sumv0) + vaddvq_f32(sumv1) + summs;
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#elif defined(__AVX2__)
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// Initialize accumulator with zeros
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__m256 acc = _mm256_setzero_ps();
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@ -2646,7 +2626,6 @@ static void ggml_vec_dot_q4_1_q8_0(const int n, float * restrict s, const void *
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for (int i = 0; i < nb; ++i) {
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const float * d0 = &x[i].d;
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const float * d1 = &y[i].d;
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//const float * m0 = &x[i].m;
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summs += x[i].m * y[i].s;
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@ -2660,33 +2639,16 @@ static void ggml_vec_dot_q4_1_q8_0(const int n, float * restrict s, const void *
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const __m256i bx = bytes_from_nibbles_32(x[i].qs);
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const __m256i by = _mm256_loadu_si256( (const __m256i *)y[i].qs );
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// Get absolute values of x vectors
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const __m256i ax = _mm256_sign_epi8( bx, bx );
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// Sign the values of the y vectors
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const __m256i sy = _mm256_sign_epi8( by, bx );
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// Perform multiplication and create 16-bit values
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const __m256i dot = _mm256_maddubs_epi16( ax, sy );
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const __m256i ones = _mm256_set1_epi16( 1 );
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const __m256i xy_q = _mm256_madd_epi16( ones, dot );
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// Convert to vector of 8 int32_t to 8 floats
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const __m256 xy = _mm256_cvtepi32_ps( xy_q );
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const __m256 xy = mul_sum_i8_pairs_float(bx, by);
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// Accumulate d0*d1*x*y
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acc = _mm256_fmadd_ps( d0d1, xy, 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 ) + summs;
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*s = hsum_float_8(acc) + summs;
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#else
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// scalar
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float sumf = 0.0;
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for (int i = 0; i < nb; i++) {
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const float d0 = x[i].d;
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const float m0 = x[i].m;
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@ -2708,9 +2670,8 @@ static void ggml_vec_dot_q4_1_q8_0(const int n, float * restrict s, const void *
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sumf += f0*f2 + f1*f3;
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}
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}
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#endif
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*s = sumf;
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#endif
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}
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static void ggml_vec_dot_q4_2_q8_0(const int n, float * restrict s, const void * restrict vx, const void * restrict vy) {
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@ -2723,8 +2684,6 @@ static void ggml_vec_dot_q4_2_q8_0(const int n, float * restrict s, const void *
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const block_q4_2 * restrict x = vx;
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const block_q8_0 * restrict y = vy;
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float sumf = 0.0;
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#if defined(__ARM_NEON)
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float32x4_t sumv0 = vdupq_n_f32(0.0f);
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float32x4_t sumv1 = vdupq_n_f32(0.0f);
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@ -2802,7 +2761,7 @@ static void ggml_vec_dot_q4_2_q8_0(const int n, float * restrict s, const void *
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#endif
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}
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sumf = vaddvq_f32(sumv0) + vaddvq_f32(sumv1);
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*s = vaddvq_f32(sumv0) + vaddvq_f32(sumv1);
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#elif defined(__AVX2__)
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// Initialize accumulator with zeros
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__m256 acc = _mm256_setzero_ps();
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@ -2824,32 +2783,16 @@ static void ggml_vec_dot_q4_2_q8_0(const int n, float * restrict s, const void *
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__m256i by = _mm256_loadu_si256((const __m256i *)y[i].qs);
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// Get absolute values of x vectors
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const __m256i ax = _mm256_sign_epi8(bx, bx);
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// Sign the values of the y vectors
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const __m256i sy = _mm256_sign_epi8(by, bx);
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// Perform multiplication and create 16-bit values
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const __m256i dot = _mm256_maddubs_epi16(ax, sy);
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const __m256i ones = _mm256_set1_epi16(1);
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__m256i xy_q = _mm256_madd_epi16(ones, dot);
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/* Convert to vectore of 8 int32_t to 8 floats */
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__m256 q = _mm256_cvtepi32_ps(xy_q);
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const __m256 q = mul_sum_i8_pairs_float(bx, by);
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/* Multiply q with scale and accumulate */
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acc = _mm256_fmadd_ps(d, q, 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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*s = hsum_float_8(acc);
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#else
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// scalar
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float sumf = 0.0;
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for (int i = 0; i < nb; i++) {
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const uint8_t * restrict x0 = x[2*i + 0].qs;
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const uint8_t * restrict x1 = x[2*i + 1].qs;
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@ -2884,9 +2827,8 @@ static void ggml_vec_dot_q4_2_q8_0(const int n, float * restrict s, const void *
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sumf += (d0 * y[i].d) * sumi_0;
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sumf += (d1 * y[i].d) * sumi_1;
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}
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#endif
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*s = sumf;
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#endif
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}
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static void ggml_vec_dot_q4_3_q8_0(const int n, float * restrict s, const void * restrict vx, const void * restrict vy) {
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@ -2899,8 +2841,6 @@ static void ggml_vec_dot_q4_3_q8_0(const int n, float * restrict s, const void *
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const block_q4_3 * restrict x = vx;
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const block_q8_0 * restrict y = vy;
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float sumf = 0.0;
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#if defined(__ARM_NEON)
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float32x4_t sumv0 = vdupq_n_f32(0.0f);
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float32x4_t sumv1 = vdupq_n_f32(0.0f);
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@ -2986,9 +2926,41 @@ static void ggml_vec_dot_q4_3_q8_0(const int n, float * restrict s, const void *
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#endif
|
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}
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sumf = vaddvq_f32(sumv0) + vaddvq_f32(sumv1);
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*s = vaddvq_f32(sumv0) + vaddvq_f32(sumv1);
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#elif defined(__AVX2__)
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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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const __m128 d0 = _mm_set1_ps(GGML_FP16_TO_FP32(x[2*i + 0].d));
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const __m128 d1 = _mm_set1_ps(GGML_FP16_TO_FP32(x[2*i + 1].d));
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const __m256 dx = _mm256_set_m128(d1, d0);
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||||
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const __m128 m0 = _mm_set1_ps(GGML_FP16_TO_FP32(x[2*i + 0].m));
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||||
const __m128 m1 = _mm_set1_ps(GGML_FP16_TO_FP32(x[2*i + 1].m));
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const __m256 mx = _mm256_set_m128(m1, m0);
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||||
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||||
const __m128i bx0 = bytes_from_nibbles_16(x[2*i + 0].qs);
|
||||
const __m128i bx1 = bytes_from_nibbles_16(x[2*i + 1].qs);
|
||||
const __m256i bx = _mm256_set_m128i(bx1, bx0);
|
||||
|
||||
const __m256 dy = _mm256_broadcast_ss(&y[i].d);
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||||
const __m256i by = _mm256_loadu_si256((const __m256i *)y[i].qs);
|
||||
|
||||
const __m256i syi = _mm256_maddubs_epi16(_mm256_set1_epi8(1), by);
|
||||
const __m256 syf = sum_i16_pairs_float(syi);
|
||||
|
||||
const __m256 q = mul_sum_i8_pairs_float(bx, by);
|
||||
|
||||
const __m256 sxy = _mm256_fmadd_ps(q, dx, _mm256_mul_ps(mx, syf));
|
||||
acc = _mm256_fmadd_ps(sxy, dy, acc);
|
||||
}
|
||||
|
||||
*s = hsum_float_8(acc);
|
||||
#else
|
||||
// scalar
|
||||
float sumf = 0.0;
|
||||
for (int i = 0; i < nb; i++) {
|
||||
const uint8_t * restrict x0 = x[2*i + 0].qs;
|
||||
const uint8_t * restrict x1 = x[2*i + 1].qs;
|
||||
|
|
@ -3031,9 +3003,8 @@ static void ggml_vec_dot_q4_3_q8_0(const int n, float * restrict s, const void *
|
|||
sumf += (d0*sxy_0 + m0*sy_0)*y[i].d;
|
||||
sumf += (d1*sxy_1 + m1*sy_1)*y[i].d;
|
||||
}
|
||||
#endif
|
||||
|
||||
*s = sumf;
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue