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ggml : vectorize Q8_0 quantization
https://github.com/ggerganov/ggml/pull/127#issuecomment-1533648531
This commit is contained in:
Georgi Gerganov
parent
6daa09d879
commit
799fdc1b5d
1 changed files with 120 additions and 0 deletions
120
ggml.c
120
ggml.c
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@ -1509,15 +1509,135 @@ static void quantize_row_q8_0_reference(const float * restrict x, block_q8_0 * r
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}
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static void quantize_row_q8_0(const float * restrict x, void * restrict vy, int k) {
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assert(QK8_0 == 32);
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assert(k % QK8_0 == 0);
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const int nb = k / QK8_0;
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block_q8_0 * restrict y = vy;
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#if defined(__ARM_NEON)
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for (int i = 0; i < nb; i++) {
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float32x4_t srcv [8];
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float32x4_t asrcv[8];
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float32x4_t amaxv[8];
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for (int l = 0; l < 8; l++) srcv[l] = vld1q_f32(x + i*32 + 4*l);
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for (int l = 0; l < 8; l++) asrcv[l] = vabsq_f32(srcv[l]);
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for (int l = 0; l < 4; l++) amaxv[2*l] = vmaxq_f32(asrcv[2*l], asrcv[2*l+1]);
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for (int l = 0; l < 2; l++) amaxv[4*l] = vmaxq_f32(amaxv[4*l], amaxv[4*l+2]);
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for (int l = 0; l < 1; l++) amaxv[8*l] = vmaxq_f32(amaxv[8*l], amaxv[8*l+4]);
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const float amax = vmaxvq_f32(amaxv[0]);
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const float d = amax / ((1 << 7) - 1);
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const float id = d ? 1.0f/d : 0.0f;
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y[i].d = d;
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for (int l = 0; l < 8; l++) {
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const float32x4_t v = vmulq_n_f32(srcv[l], id);
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const int32x4_t vi = vcvtnq_s32_f32(v);
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y[i].qs[4*l + 0] = vgetq_lane_s32(vi, 0);
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y[i].qs[4*l + 1] = vgetq_lane_s32(vi, 1);
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y[i].qs[4*l + 2] = vgetq_lane_s32(vi, 2);
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y[i].qs[4*l + 3] = vgetq_lane_s32(vi, 3);
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}
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}
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#elif defined(__AVX2__) || 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 / 127.f;
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y[i].d = d;
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const float id = ( maxScalar != 0.0f ) ? 127.f / 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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#if defined(__AVX2__)
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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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i2 = _mm256_packs_epi32( i2, i3 ); // 16, 17, 18, 19, 24, 25, 26, 27, 20, 21, 22, 23, 28, 29, 30, 31
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// Convert int16 to int8
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i0 = _mm256_packs_epi16( i0, i2 ); // 0, 1, 2, 3, 8, 9, 10, 11, 16, 17, 18, 19, 24, 25, 26, 27, 4, 5, 6, 7, 12, 13, 14, 15, 20, 21, 22, 23, 28, 29, 30, 31
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// We got our precious signed bytes, but the order is now wrong
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// These AVX2 pack instructions process 16-byte pieces independently
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// The following instruction is fixing the order
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const __m256i perm = _mm256_setr_epi32( 0, 4, 1, 5, 2, 6, 3, 7 );
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i0 = _mm256_permutevar8x32_epi32( i0, perm );
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_mm256_storeu_si256((__m256i *)y[i].qs, i0);
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#else
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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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_mm_storeu_si128((__m128i *)(y[i].qs + 0), ni0);
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_mm_storeu_si128((__m128i *)(y[i].qs + 16), ni4);
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#endif
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}
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#else
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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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}
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// reference implementation for deterministic creation of model files
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static void quantize_row_q8_1_reference(const float * restrict x, block_q8_1 * restrict y, int k) {
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assert(QK8_1 == 32);
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assert(k % QK8_1 == 0);
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const int nb = k / QK8_1;
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