[PATCH] D21379: [X86] Heuristic to selectively build Newton-Raphson SQRT estimation

[Sanjay Patel via llvm-commits]

spatel added a subscriber: v_klochkov.
spatel added a comment.

Hal's comment about the MachineCombiner reminded me of the excellent list of FMA loop examples provided by @v_klochkov in:
https://reviews.llvm.org/D18751.

Summary: the latency vs. throughput trade-off is tricky even if we defer the decision to a later pass.

LGTM, but Hal can confirm if the added comments are sufficient.


https://reviews.llvm.org/D21379