[PATCH] D143201: DAG: Lower single infinity is.fpclass tests to fcmp

[Serge Pavlov via Phabricator via llvm-commits]

sepavloff added a comment.

What is the advantage of such lowering?

Implementation of `is_fpclass` as `fcmp` requires materialization of infinity constant. In contrast to zero constant, which often can be easily materialized, infinity usually requires loading constant from memory. So additional memory access is required as compared to the default lowering.


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  https://reviews.llvm.org/D143201/new/

https://reviews.llvm.org/D143201