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Fix the bug of misaligned address in vectorization. by baoqiwen · Pull Request #72106 · PaddlePaddle/Paddle · GitHub
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Fix the bug of misaligned address in vectorization. #72106
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PR Category
CINN
PR Types
Bug fixes
Description
Pcard-89071
向量化索引中包含

a % b
,但是b % factor != 0
的场景存在索引越界,例子:该patch删除了tensor_is_continuous的代码:
paddle/cinn/ir/group_schedule/config/group_tile_util.cc的GetGroupVectorizeInfo保证,“存在非连续的变量,can_vectorize就为false”,不需要在后续代码中再次判断非连续了,故删除旧代码。
CheckTensorAddrLegalCastToVectorize的逻辑:
[a, b, c, d, e] + [a, 1, c, 1, e](shape为1的维度做broadcast)
这俩者相加,计算索引的代码会出现
%e
,/(d*e)
等(包括%(c*d*e)
,但只需要找到最小的除余或除号后面的数)。对于offset_is_zero:
1)CheckTensorAddrLegalCastToVectorize能处理最低维做广播的情况:
shape为[a, b, c, d] + [a, b, 1, 1]的场景,能通过判断
flattened_value % vectorize_factor != 0
,剔除这个情况。2)CheckTensorAddrLegalCastToVectorize无法处理
shape.size() = 1的情况
:shape为[b]和[a, b, c, d]两个tensor发生计算关系,无法处理。所以保留了旧代码CheckTensorOffsetZero。