[PATCH] D51630: [DAGCombiner] try to convert pow(x, 0.25) to sqrt(sqrt(x))

[Tim Northover via Phabricator via llvm-commits]

t.p.northover added a comment.

They'd probably work. We often just use useful triples, maybe `thumbv8-linux-gnueabihf`, and perhaps `thumbv7m-linux-gnueabi` as a soft-float target that ought to use libcalls for everything (I'd probably just check there are the appropriate number of calls there rather than tracking all the marshalling nonsense that goes on).


https://reviews.llvm.org/D51630