[PATCH] D31821: Remove redundant copy in recurrences

[Quentin Colombet via Phabricator via llvm-commits]

qcolombet added a comment.

>   The problem doesn't appear while we're in SSA [...]

Why is that?
The marking of tie operand is already there, following phis shouldn't be an issue and would eliminate the whole data flow processing.

What am I missing?

Side question; if several recurrence chains share some operand, how do you pick the most profitable one?


https://reviews.llvm.org/D31821