forked from OSchip/llvm-project
15b9380dfd
Change `sinf` range reduction to mod pi/16 to be shared with `cosf`. Previously, `sinf` used range reduction `mod pi`, but this cannot be used to implement `cosf` since the minimax algorithm for `cosf` does not converge due to critical points at `pi/2`. In order to be able to share the same range reduction functions for both `sinf` and `cosf`, we change the range reduction to `mod pi/16` for the following reasons: - The table size is sufficiently small: 32 entries for `sin(k * pi/16)` with `k = 0..31`. It could be reduced to 16 entries if we treat the final sign separately, with an extra multiplication at the end. - The polynomials' degrees are reduced to 7/8 from 15, with extra computations to combine `sin` and `cos` with trig sum equality. - The number of exceptional cases reduced to 2 (with FMA) and 3 (without FMA). - The latency is reduced while maintaining similar throughput as before. Reviewed By: zimmermann6 Differential Revision: https://reviews.llvm.org/D130629 |
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| .. | ||
| CMakeLists.txt | ||
| README.txt | ||
| api_test.rst | ||
| build_system.rst | ||
| clang_tidy_checks.rst | ||
| conf.py | ||
| entrypoints.rst | ||
| fuzzing.rst | ||
| ground_truth_specification.rst | ||
| header_gen_scheme.svg | ||
| header_generation.rst | ||
| implementation_standard.rst | ||
| index.rst | ||
| layering.rst | ||
| math.rst | ||
| mechanics_of_public_api.rst | ||
| redirectors.rst | ||
| redirectors_schematic.svg | ||
| runtimes_build.rst | ||
| source_layout.rst | ||
| stdio.rst | ||
| strings.rst | ||
README.txt
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.