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e80d68f22a
LoopCacheAnalysis currently assumes the loop will be iterated over in a forward direction. This patch addresses the issue by using the absolute value of the stride when iterating backwards. Note: this patch will treat negative and positive array access the same, resulting in the same cost being calculated for single and bi-directional access patterns. This should be improved in a subsequent patch. Reviewed By: jdoerfert Differential Revision: https://reviews.llvm.org/D73064
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