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[libc][math] Update range reduction step for log10f and reduce its la…
…tency. Simplify the range reduction steps by choosing the reduction constants carefully so that the reduced arguments v = r*m_x - 1 and v^2 are exact in double precision, even without FMA instructions, and -2^-8 <= v < 2^-7. This allows the polynomial evaluations to be parallelized more efficiently. Reviewed By: zimmermann6 Differential Revision: https://reviews.llvm.org/D147676
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