ikawrakow/ik_llama.cpp
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CPU: faster FA (#797)

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* Avoid computing FA chunks where the mask is -infinity

* Avoid computing FA chunks where the mask is -infinity also for f16/bf16

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Co-authored-by: Iwan Kawrakow <iwan.kawrakow@gmail.com>
This commit is contained in:
Kawrakow
2025-09-26 09:00:25 +02:00
committed by GitHub
parent 4f9b0ec4f0
commit bc34573356
1 changed files with 17 additions and 3 deletions
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20
ggml/src/iqk/fa/iqk_fa_templates.h
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@@ -1355,7 +1355,11 @@ void compute_helper(KHelper& kh, VHelper& vh, int nq1, int nk1, int stride_q, in
KQHelper::convert(q_step, stride_q, q, q_f16);
#endif
auto mr = mask;
for (int k1 = 0; k1 < nk1/k_step; ++k1) {
auto Mc = (const uint16_t *)(mr + (q_step - 1)*stride_m);
int ik = nk1 - k_step;
for (; ik >=0 && Mc[ik] != 0; ik -= k_step);
ik += k_step;
for (int k1 = 0; k1 < ik/k_step; ++k1) {
#ifdef __aarch64__
KQHelper::multiply_mask_kq(kh, Dk, stride_m, q_f16, mr, fms);
#else
@@ -1415,6 +1419,8 @@ void compute_helper_q(KHelper& kh, VHelper& vh, int nq1, int nk1, int stride_q,
HelperQ80::convert<Dk>(q_step, stride_q, q, q8r);
auto mr = mask;
for (int k1 = 0; k1 < nk1/k_step; ++k1) {
auto Mc = (const uint16_t *)(mr + (q_step - 1)*stride_m);
if (Mc[0] != 0) break;
HelperQ80R8<Dk>::repack(k_step, kh.block, kh.stride, q8r8);
KQHelper::mul_mask_kq(khr8, stride_m, q8r, mr, fms);
fqkv.accumulate_qkv(vh, fms);
@@ -1441,7 +1447,11 @@ void compute_helper_q(KHelper& kh, VHelper& vh, int nq1, int nk1, int stride_q,
perf.accum_nolock(0, t1);
#endif
auto mr = mask;
for (int k1 = 0; k1 < nk1/k_step; ++k1) {
auto Mc = (const uint16_t *)(mr + (q_step - 1)*stride_m);
int ik = nk1 - k_step;
for (; ik >=0 && Mc[ik] != 0; ik -= k_step);
ik += k_step;
for (int k1 = 0; k1 < ik/k_step; ++k1) {
#if FA_TIMING
t1 = Perf::cur_time();
KQHelper::mul_mask_kq(kh, stride_m, q8, mr, fms);
@@ -1959,7 +1969,11 @@ struct FlashAttnBF16 {
perf.accum_nolock(0, t1);
#endif
auto mr = mask;
for (int k1 = 0; k1 < nk1/k_step; ++k1) {
auto Mc = (const uint16_t *)(mr + (q_step - 1)*stride_m);
int ik = nk1 - k_step;
for (; ik >=0 && Mc[ik] != 0; ik -= k_step);
ik += k_step;
for (int k1 = 0; k1 < ik/k_step; ++k1) {
#if FA_TIMING
//t1 = Perf::cur_time();
FlashQKbf16<Dk, q_step, k_step>::multiply_mask_kq(kh, stride_m, q_bf16, mr, fms, perf);