ikawrakow/ik_llama.cpp
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On Zen4 repack fp16 models to bf16_r16 when run-time-repacking is requested

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This massively improves performance. As this is opt-in, we do not worry
about possible precision loss in the f16 -> bf16 conversion.
This commit is contained in:
Iwan Kawrakow
2025-01-21 19:14:57 +02:00
parent 3c5f87225f
commit ef2b0066b9
1 changed files with 3 additions and 1 deletions
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4
ggml/src/iqk/iqk_quantize.cpp
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@@ -5260,6 +5260,7 @@ inline ggml_bf16_t to_bf16(const float& x) {
helper.f = x;
return ggml_bf16_t{(uint16_t)(helper.u >> 16)};
}
inline ggml_bf16_t to_bf16(const ggml_half& x) { return to_bf16(GGML_FP16_TO_FP32(x)); }
inline ggml_bf16_t to_bf16(const ggml_bf16_t& x) { return x; }
template <typename T>
void repack_bf16(int nrows, int n_per_row, const T * x, ggml_bf16_t * y) {
@@ -6082,7 +6083,8 @@ void iqk_repack_tensor(struct ggml_tensor * tensor) {
{ GGML_TYPE_Q8_0, { GGML_TYPE_Q8_0_R4, 4, (Repack::repack_func)repack_q8_0} },
{ GGML_TYPE_Q8_K, { GGML_TYPE_Q8_K_R8, 8, (Repack::repack_func)repack_q8_k} },
#ifdef __AVX512BF16__
{ GGML_TYPE_BF16, { GGML_TYPE_BF16_R16, 16, (Repack::repack_func)repack_bf16<ggml_bf16_t>} },
{ GGML_TYPE_BF16, { GGML_TYPE_BF16_R16, 16, (Repack::repack_func)repack_bf16<ggml_bf16_t>}},
{ GGML_TYPE_F16, { GGML_TYPE_BF16_R16, 16, (Repack::repack_func)repack_bf16<ggml_half>} },
#endif
};