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
This commit is contained in:
perserk
GitHub
parent
cbef542879
commit
02c5b27e91
153
ggml.c
153
ggml.c
|
|
@ -461,6 +461,39 @@ static inline __m128i packNibbles( __m256i bytes )
|
|||
__m128i r1 = _mm256_extracti128_si256( bytes, 1 );
|
||||
return _mm_packus_epi16( r0, r1 );
|
||||
}
|
||||
#elif __AVX__
|
||||
static inline __m128i bytesFromNibbles( const uint8_t* rsi )
|
||||
{
|
||||
// Load 8 bytes from memory
|
||||
__m128i tmp = _mm_loadu_si64( ( const __m128i* )rsi );
|
||||
|
||||
// Expand bytes into uint16_t values
|
||||
__m128i bytes = _mm_cvtepu8_epi16( tmp );
|
||||
|
||||
// Unpack values into individual bytes
|
||||
const __m128i lowMask = _mm_set1_epi8( 0xF );
|
||||
__m128i high = _mm_andnot_si128( lowMask, bytes );
|
||||
__m128i low = _mm_and_si128( lowMask, bytes );
|
||||
high = _mm_slli_epi16( high, 4 );
|
||||
bytes = _mm_or_si128( low, high );
|
||||
return bytes;
|
||||
}
|
||||
|
||||
static inline __m128i packNibbles( __m128i bytes1, __m128i bytes2 )
|
||||
{
|
||||
// Move bits within 16-bit lanes from 0000_abcd_0000_efgh into 0000_0000_abcd_efgh
|
||||
const __m128i lowByte = _mm_set1_epi16( 0xFF );
|
||||
__m128i high = _mm_andnot_si128( lowByte, bytes1 );
|
||||
__m128i low = _mm_and_si128( lowByte, bytes1 );
|
||||
high = _mm_srli_epi16( high, 4 );
|
||||
bytes1 = _mm_or_si128( low, high );
|
||||
high = _mm_andnot_si128( lowByte, bytes2 );
|
||||
low = _mm_and_si128( lowByte, bytes2 );
|
||||
high = _mm_srli_epi16( high, 4 );
|
||||
bytes2 = _mm_or_si128( low, high );
|
||||
|
||||
return _mm_packus_epi16( bytes1, bytes2);
|
||||
}
|
||||
#endif
|
||||
|
||||
// method 5
|
||||
|
|
@ -660,6 +693,80 @@ static void quantize_row_q4_0(const float * restrict x, void * restrict vy, int
|
|||
__m128i res = packNibbles( i0 );
|
||||
_mm_storeu_si128( ( __m128i* )y[i].qs, res );
|
||||
}
|
||||
#elif defined(__AVX__)
|
||||
for (int i = 0; i < nb; i++) {
|
||||
// Load elements into 4 AVX vectors
|
||||
__m256 v0 = _mm256_loadu_ps( x );
|
||||
__m256 v1 = _mm256_loadu_ps( x + 8 );
|
||||
__m256 v2 = _mm256_loadu_ps( x + 16 );
|
||||
__m256 v3 = _mm256_loadu_ps( x + 24 );
|
||||
x += 32;
|
||||
|
||||
// Compute max(abs(e)) for the block
|
||||
const __m256 signBit = _mm256_set1_ps( -0.0f );
|
||||
__m256 maxAbs = _mm256_andnot_ps( signBit, v0 );
|
||||
maxAbs = _mm256_max_ps( maxAbs, _mm256_andnot_ps( signBit, v1 ) );
|
||||
maxAbs = _mm256_max_ps( maxAbs, _mm256_andnot_ps( signBit, v2 ) );
|
||||
maxAbs = _mm256_max_ps( maxAbs, _mm256_andnot_ps( signBit, v3 ) );
|
||||
|
||||
__m128 max4 = _mm_max_ps( _mm256_extractf128_ps( maxAbs, 1 ), _mm256_castps256_ps128( maxAbs ) );
|
||||
max4 = _mm_max_ps( max4, _mm_movehl_ps( max4, max4 ) );
|
||||
max4 = _mm_max_ss( max4, _mm_movehdup_ps( max4 ) );
|
||||
const float maxScalar = _mm_cvtss_f32( max4 );
|
||||
|
||||
// Quantize these floats
|
||||
const float d = maxScalar / 7.0f;
|
||||
y[i].d = d;
|
||||
const float id = ( maxScalar != 0.0f ) ? 7.0f / maxScalar : 0.0f;
|
||||
const __m256 mul = _mm256_set1_ps( id );
|
||||
|
||||
// Apply the multiplier
|
||||
v0 = _mm256_mul_ps( v0, mul );
|
||||
v1 = _mm256_mul_ps( v1, mul );
|
||||
v2 = _mm256_mul_ps( v2, mul );
|
||||
v3 = _mm256_mul_ps( v3, mul );
|
||||
|
||||
// Round to nearest integer
|
||||
v0 = _mm256_round_ps( v0, _MM_ROUND_NEAREST );
|
||||
v1 = _mm256_round_ps( v1, _MM_ROUND_NEAREST );
|
||||
v2 = _mm256_round_ps( v2, _MM_ROUND_NEAREST );
|
||||
v3 = _mm256_round_ps( v3, _MM_ROUND_NEAREST );
|
||||
|
||||
// Convert floats to integers
|
||||
__m256i i0 = _mm256_cvtps_epi32( v0 );
|
||||
__m256i i1 = _mm256_cvtps_epi32( v1 );
|
||||
__m256i i2 = _mm256_cvtps_epi32( v2 );
|
||||
__m256i i3 = _mm256_cvtps_epi32( v3 );
|
||||
|
||||
// Since we don't have in AVX some necessary functions,
|
||||
// we split the registers in half and call AVX2 analogs from SSE
|
||||
__m128i ni0 = _mm256_castsi256_si128( i0 );
|
||||
__m128i ni1 = _mm256_extractf128_si256( i0, 1);
|
||||
__m128i ni2 = _mm256_castsi256_si128( i1 );
|
||||
__m128i ni3 = _mm256_extractf128_si256( i1, 1);
|
||||
__m128i ni4 = _mm256_castsi256_si128( i2 );
|
||||
__m128i ni5 = _mm256_extractf128_si256( i2, 1);
|
||||
__m128i ni6 = _mm256_castsi256_si128( i3 );
|
||||
__m128i ni7 = _mm256_extractf128_si256( i3, 1);
|
||||
|
||||
// Convert int32 to int16
|
||||
ni0 = _mm_packs_epi32( ni0, ni1 );
|
||||
ni2 = _mm_packs_epi32( ni2, ni3 );
|
||||
ni4 = _mm_packs_epi32( ni4, ni5 );
|
||||
ni6 = _mm_packs_epi32( ni6, ni7 );
|
||||
// Convert int16 to int8
|
||||
ni0 = _mm_packs_epi16( ni0, ni2 );
|
||||
ni4 = _mm_packs_epi16( ni4, ni6 );
|
||||
|
||||
// Apply offset to translate the range from [ -7 .. +7 ] into [ +1 .. +15 ]
|
||||
const __m128i off = _mm_set1_epi8( 8);
|
||||
ni0 = _mm_add_epi8( ni0, off );
|
||||
ni4 = _mm_add_epi8( ni4, off );
|
||||
|
||||
// Compress the vector into 4 bit/value, and store
|
||||
__m128i res = packNibbles( ni0, ni4 );
|
||||
_mm_storeu_si128( ( __m128i* )y[i].qs, res );
|
||||
}
|
||||
#elif defined(__wasm_simd128__)
|
||||
for (int i = 0; i < nb; i++) {
|
||||
float amax = 0.0f; // absolute max
|
||||
|
|
@ -1892,6 +1999,52 @@ static void ggml_vec_dot_q4_0(const int n, float * restrict s, const void * rest
|
|||
res = _mm_add_ps( res, _mm_movehl_ps( res, res ) );
|
||||
res = _mm_add_ss( res, _mm_movehdup_ps( res ) );
|
||||
|
||||
sumf = _mm_cvtss_f32( res );
|
||||
#elif defined(__AVX__)
|
||||
// Initialize accumulator with zeros
|
||||
__m256 acc = _mm256_setzero_ps();
|
||||
|
||||
// Main loop
|
||||
for (int i = 0; i < nb; ++i) {
|
||||
// Compute combined scale for the block
|
||||
const __m256 d = _mm256_mul_ps( _mm256_broadcast_ss( &x[i].d ), _mm256_broadcast_ss( &y[i].d ) );
|
||||
|
||||
__m128i i32[2];
|
||||
for (int j = 0; j < 2; ++j) {
|
||||
// Load 8 bytes, and unpack 4 bit fields into bytes, making 16 bytes
|
||||
__m128i bx = bytesFromNibbles( x[i].qs + 8*j );
|
||||
__m128i by = bytesFromNibbles( y[i].qs + 8*j );
|
||||
|
||||
// Now we have a vector with bytes in [ 0 .. 15 ] interval. Offset them into [ -8 .. +7 ] interval.
|
||||
const __m128i off = _mm_set1_epi8( 8 );
|
||||
bx = _mm_sub_epi8( bx, off );
|
||||
by = _mm_sub_epi8( by, off );
|
||||
|
||||
// Get absolute values of x vectors
|
||||
const __m128i ax = _mm_sign_epi8(bx, bx);
|
||||
|
||||
// Sign the values of the y vectors
|
||||
const __m128i sy = _mm_sign_epi8(by, bx);
|
||||
|
||||
// Perform multiplication and create 16-bit values
|
||||
const __m128i dot = _mm_maddubs_epi16(ax, sy);
|
||||
|
||||
const __m128i ones = _mm_set1_epi16(1);
|
||||
i32[j] = _mm_madd_epi16(ones, dot);
|
||||
}
|
||||
|
||||
// Convert int32_t to float
|
||||
__m256 p = _mm256_cvtepi32_ps( _mm256_set_m128i( i32[0], i32[1] ));
|
||||
// Apply the scale, and accumulate
|
||||
acc = _mm256_add_ps(_mm256_mul_ps( d, p ), acc);
|
||||
}
|
||||
|
||||
// Return horizontal sum of the acc vector
|
||||
__m128 res = _mm256_extractf128_ps( acc, 1 );
|
||||
res = _mm_add_ps( res, _mm256_castps256_ps128( acc ) );
|
||||
res = _mm_add_ps( res, _mm_movehl_ps( res, res ) );
|
||||
res = _mm_add_ss( res, _mm_movehdup_ps( res ) );
|
||||
|
||||
sumf = _mm_cvtss_f32( res );
|
||||
#elif defined(__wasm_simd128__)
|
||||
// wasm simd
|
||||
|
|
|
|||
Loading…
Reference in a new issue