[PATCH] D18155: Instcombine: try to avoid wasted work in ConstantFold
escha via llvm-commits
llvm-commits at lists.llvm.org
Tue Mar 15 21:54:51 PDT 2016
escha added a comment.
Yeah, I don't understand that part either!
Reordering them alone isn't enough because the slow part isn't the creation of a new simplified ConstExpr; it's running the simplify function, which takes time even if it ends up doing nothing, AFAIK.
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