[PATCH] D145230: [ScalarEvolution] Apply loop guards against min/max for its arguments

[Max Kazantsev via Phabricator via llvm-commits]

mkazantsev added a comment.

So far plans look follwing:

1. Refactor switch cases into fallthroughs;
2. Then, make an NFC that calls a function. Instead of

  RewrittenRHS = getUMaxExpr(RewrittenLHS, RHS);

smth like

  RewrittenRHS = AddRewrites(RewrittenLHS, RHS);

3. Into this function, add handling of min/max (non-recursive stack-based traversal). The returned value should be the rewrite of original `RewrittenLHS` no matter if it's a min or not.

As a side thing - add checks that, whenever you compute `RHS + - 1`, it is not a `MAX/MIN` int respectively. In this case we should not rewrite anything.


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  https://reviews.llvm.org/D145230/new/

https://reviews.llvm.org/D145230