ver4a/llama.cpp
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Dequant improvements rebase (#8255)

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* Single load for half2

* Store scales in local mem

* Vec load quantized values
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AidanBeltonS 2024-07-03 02:55:34 +01:00 • committed by GitHub
parent a27152b602
commit fadde67135
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3 changed files with 30 additions and 13 deletions
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30
ggml/src/ggml-sycl/dequantize.hpp
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@ -293,7 +293,8 @@ static void dequantize_block_q3_K(const void * __restrict__ vx, dst_t * __restri
#if QK_K == 256
static inline void get_scale_min_k4(int j, const uint8_t * q, uint8_t & d, uint8_t & m) {
if (j < 4) {
d = q[j] & 63; m = q[j + 4] & 63;
d = q[j] & 63;
m = q[j + 4] & 63;
} else {
d = (q[j+4] & 0xF) | ((q[j-4] >> 6) << 4);
m = (q[j+4] >> 4) | ((q[j-0] >> 6) << 4);
@ -303,7 +304,7 @@ static inline void get_scale_min_k4(int j, const uint8_t * q, uint8_t & d, uint8
template<typename dst_t>
static void dequantize_block_q4_K(const void * __restrict__ vx, dst_t * __restrict__ yy,
const sycl::nd_item<3> &item_ct1) {
uint8_t* scales_local, const sycl::nd_item<3> &item_ct1) {
const block_q4_K * x = (const block_q4_K *) vx;
const int i = item_ct1.get_group(2);
@ -318,19 +319,26 @@ static void dequantize_block_q4_K(const void * __restrict__ vx, dst_t * __restri
dst_t * y = yy + i*QK_K + 64*il + n*ir;
const float dall = x[i].dm[0];
const float dmin = x[i].dm[1];
const sycl::half2 dm = x[i].dm;
const float dall = dm[0];
const float dmin = dm[1];
const uint8_t * q = x[i].qs + 32*il + n*ir;
if (tid < 12)
scales_local[tid] = x[i].scales[tid];
item_ct1.barrier(sycl::access::fence_space::local_space);
uint8_t sc, m;
get_scale_min_k4(is + 0, x[i].scales, sc, m);
const float d1 = dall * sc; const float m1 = dmin * m;
get_scale_min_k4(is + 1, x[i].scales, sc, m);
const float d2 = dall * sc; const float m2 = dmin * m;
get_scale_min_k4(is + 0, scales_local, sc, m);
const float d1 = dall * sc;
const float m1 = dmin * m;
get_scale_min_k4(is + 1, scales_local, sc, m);
const float d2 = dall * sc;
const float m2 = dmin * m;
sycl::vec<uint8_t, n> q_vec = vec_aligned_load<uint8_t, n>(x[i].qs + 32*il + n*ir);
for (int l = 0; l < n; ++l) {
y[l + 0] = d1 * (q[l] & 0xF) - m1;
y[l +32] = d2 * (q[l] >> 4) - m2;
y[l + 0] = d1 * (q_vec[l] & 0xF) - m1;
y[l +32] = d2 * (q_vec[l] >> 4) - m2;
}
#else
const int tid = item_ct1.get_local_id(2);