wehub-resource-sync
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
// Copyright (c) 2024 CINN Authors. All Rights Reserved.
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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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// http://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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#pragma once
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#include <vector>
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#include "paddle/cinn/common/common.h"
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#include "paddle/cinn/ir/ir.h"
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namespace cinn {
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namespace optim {
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/**
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* This pass handles the cross-block reduction properly.
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*
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* Specific transformations:
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* 1. Reorders the schedule blocks to separate upstreams and downstreams
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* of cross-block reduction.
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* 2. Replaces the cross-block reduction with an external call to the
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* `grid_reduce` template function.
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* 3. Pushes global buffers (`rf`) to the function's argument
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* list.
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*
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* Example:
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*
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* function reduce_sum (..., var_1)
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* {
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* thread_bind[blockIdx.x] for (i, 0, 16):
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* thread_bind[blockIdx.y] for (j, 0, 8): // reduce axis
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* var_1[i] += var_1_rf[j, i]
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* }
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*
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* After pass:
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*
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* function reduce_sum (..., var_1, var_1_rf)
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* {
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* thread_bind[blockIdx.x] for (i, 0, 16):
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* thread_bind[blockIdx.y] for (j, 0, 8): // reduce axis
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* var_1[i] = grid_reduce_sum(var_1_rf)
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* }
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*/
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void ReplaceCrossBlockReduction(ir::LoweredFunc fn);
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} // namespace optim
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} // namespace cinn
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