Rewrite For loop over IList to a ranged For loop for better unrolling.
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weinbe58
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Ilist to a ranged For loop for better folding. IList to a ranged For loop for better folding.
weinbe58
changed the title
IList to a ranged For loop for better folding. IList to a ranged For loop for better unrolling.
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In this PR I implement a rewrite that effectively rewrites:
to
which is equivalent in terms of execution but is easier to massage into a state that can be unrolled by combining this rewrite with
HintLenrewrite rule effectively allowing theiterableargument of the newscf.Forstatement to be known at compile time even ifilist_valueis not a constant.The reason I think we should have this rule instead of implementing a specialization in the unroll of the for loop is that this rewrite is independent of the unroll rewrite and so you do not need to worry about a dependency between the unroll rule and the
ilistdialect.