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Commit f13b43d5 authored by Phoebe Wang's avatar Phoebe Wang
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[X86][FP16] Only generate approximate rsqrt when Reciprocal is true for half type 

We have reasonable fast sqrt and accurate rsqrt for half type due to the
limited fractions. So neither do we need multi steps refinement for
rsqrt nor replace sqrt by rsqrt.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D114844
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