Handle new loop nest constraints during transformation#473

Draft

jdsteve2 wants to merge 18 commits intonew-loop-nest-constraintsfrom handle-new-loop-nest-constraints-during-transformation

+1,024-1

Commits on Jul 27, 2021

add three functions that will be used for updating loop nest constraints during transformation (initially copied in from old loop-nest-constraints-v2 branch with minor changes)
jdsteve2
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refactor replace_inames_in_nest_constraints: move _coalesce_duplicate_inames_in_one_nesting to top level and document; clarify code+comments
jdsteve2
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clearer comments in replace_inames_in_graph
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clean up code/comments in replace_inames_in_all_nest_constraints
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change default arg value from set to frozenset in replace_inames_in_all_nest_constraints
jdsteve2
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handle nest constraints during split_iname
jdsteve2
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handle nest constraints during remove_unused_inames
jdsteve2
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test constraint updating during split_iname
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update nest constraints during duplicate_inames
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test updating of nest constraints during duplicate_inames
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raise NotImplementedError in rename_iname when there are nest_constraints and does_exist=True
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test updating of nest constraints during rename_iname
jdsteve2
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check for nest constraint conflicts in tag_inames
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test checking of nest constraint conflicts in tag_inames
jdsteve2
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