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Implement double precision log10 function correctly rounded for all rounding modes. This implementation currently needs FMA instructions for correctness. Use 2 passes: Fast pass: - 1 step range reduction with a lookup table of `2^7 = 128` elements to reduce the ranges to `[-2^-7, 2^-7]`. - Use a degree-7 minimax polynomial generated by Sollya, evaluated using a mixed of double-double and double precisions. - Apply Ziv's test for accuracy. Accurate pass: - Apply 5 more range reduction steps to reduce the ranges further to [-2^-27, 2^-27]. - Use a degree-4 minimax polynomial generated by Sollya, evaluated using 192-bit precisions. - By the result of Lefevre (add quote), this is more than enough for correct rounding to all rounding modes. In progress: Adding detail documentations about the algorithm. Depend on: https://reviews.llvm.org/D136799 Reviewed By: zimmermann6 Differential Revision: https://reviews.llvm.org/D139846
libc Documentation ================== The libc documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure libc with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DLIBC_INCLUDE_DOCS=ON After configuring libc with these options the make rule `docs-libc-html` should be available.