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[CINN] Fix template replacement of NoReduceMethod by lshpku · Pull Request #71813 · PaddlePaddle/Paddle · GitHub
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[CINN] Fix template replacement of NoReduceMethod #71813
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PR Category
CINN
PR Types
Bug fixes
Description
规范Reduce直接写回memory的行为，修复reduce_method=NoRedceMethod时的一个错误
规定
由于之前yield_store时有时无，Reduce是否能直接写回memory也没有规定，因此本PR规定如下：
代码修改
为了让串行Reduce不直接写回memory，本PR修改了调度的一些判定，即使在loop很小的情况下也进行RFactor操作，这样保证一定会创建一个中间变量用于Reduce
另外，由于串行Reduce不需要进行同步，调度器会将其标记为reduce_method=NoReduceMethod，NoReduce指的不是没有Reduce，而是不需要替换CUDA同步模板，只要自然写回就好；本PR也相应修改了后端Pass的替换逻辑
Pcard-85711