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The implementations use the x86_64 FPU instructions. These instructions are extremely slow compared to a polynomial based software implementation. Also, their accuracy falls drastically once the input goes beyond 2PI. To improve both the speed and accuracy, we will be taking the following approach going forward: 1. As a follow up to this CL, we will implement a range reduction algorithm which will expand the accuracy to the entire double precision range. 2. After that, we will replace the HW instructions with a polynomial implementation to improve the run time. After step 2, the implementations will be accurate, performant and target architecture independent. Reviewed By: lntue Differential Revision: https://reviews.llvm.org/D102384
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.