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[PowerPC] Use the two-constant NR algorithm for refining estimates
The single-constant algorithm produces infinities on a lot of denormal values. The precision of the two-constant algorithm is actually sufficient across the range of denormals. We will switch to that algorithm for now to avoid the infinities on denormals. In the future, we will re-evaluate the algorithm to find the optimal one for PowerPC. Differential revision: https://reviews.llvm.org/D60037 llvm-svn: 360144
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