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[DO NOT MERGE] attempt at reproducing error #458
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added 3 commits
May 29, 2018 08:59
isl does not currently perform any operations lazily, so a potentially large product map would get created even if only a very small part of it will actually get used. Intersect domain and range directly instead.
…functions Store this mapping in addition to the filter derived from the mapping. The mapping is needed in the next commit. The mapping is constructed in ScheduleTree::makeMappingFilter and passed to the ScheduleTreeElemMappingFilter constructor. Some of the sanity checks are therefore moved from the constructor to ScheduleTree::makeMappingFilter.
In particular, use mappings to threads and warps to determine whether all dependences are within a thread or warp. Do so instead of considering pairs of thread identifier parameters. Duplicating thread identifier parameters is confusing at best and relies on renaming parameters, which is frowned upon and which will not be exported in the mainline isl C++ interface. Duplicate parameters are confusing because there is only one value for any given thread identifier at a given point in the execution. Furthermore, the filter assigning the thread mapping to parameters is only relevant during AST generation. Prior to that, it is more natural to think in terms of the thread mapping itself. This is what this commit does. It is not only simpler, but also shorter. It is not entirely clear why the intersection with the context is needed, but this is what the original code does and it is preserved by this commit.
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