mirror of https://github.com/google/gemma.cpp.git
65 lines
3.1 KiB
C++
65 lines
3.1 KiB
C++
// Copyright 2025 Google LLC
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// SPDX-License-Identifier: Apache-2.0
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_GEMMA_CPP_GEMMA_FLASH_ATTENTION_H_
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#define THIRD_PARTY_GEMMA_CPP_GEMMA_FLASH_ATTENTION_H_
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// Declares FlashAttention for all SIMD targets.
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#include <stddef.h>
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#include "gemma/gemma.h"
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#include "hwy/highway.h"
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namespace gcpp {
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// Passed to HWY_VISIT_TARGETS; declares for one target.
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#define GEMMA_DECL_FLASH_ATTENTION(TARGET, NAMESPACE) \
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namespace NAMESPACE { \
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void RMSNormAndPositionalEncoding( \
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size_t num_tokens, const QBatch& qbatch, MatPtrT<float>& q, \
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const MatPtrT<float>& query_norm_scale, size_t layer_idx, \
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const AttentionActivationsPtrs& activations, ThreadingContext& ctx); \
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\
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void SingleFlashAttention(size_t start_pos, size_t last_pos, \
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const float* HWY_RESTRICT q, \
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const MatPtrT<KV_t>& k, const MatPtrT<KV_t>& v, \
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size_t layer_idx, \
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const AttentionActivationsPtrs& activations, \
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float* HWY_RESTRICT att_out, \
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ThreadingContext& ctx, size_t worker); \
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\
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size_t GetVTileSize(size_t kNF, size_t num_head_groups, size_t num_tokens, \
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size_t total_tasks, size_t target_parallelism); \
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\
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void FlashAttention(size_t num_tokens, size_t target_parallelism, \
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size_t layer_idx, \
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const MatPtrT<float>& query_norm_scale, \
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AttentionActivationsPtrs& activations, QBatch& qbatch, \
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ThreadingContext& ctx); \
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/* NOLINTNEXTLINE(google-readability-namespace-comments) */ \
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} // namespace NAMESPACE
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// Function declarations for each SIMD target. Allows direct call from the
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// per-target namespace. We may later replace this with dynamic dispatch if
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// the overhead is acceptable.
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HWY_VISIT_TARGETS(GEMMA_DECL_FLASH_ATTENTION)
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#undef GEMMA_DECL_FLASH_ATTENTION
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} // namespace gcpp
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#endif // THIRD_PARTY_GEMMA_CPP_GEMMA_FLASH_ATTENTION_H_
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