Provide tan in libc
#96930
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@llvm/issue-subscribers-libc Author: Petr Hosek (petrhosek)
We're trying to build Pico SDK against LLVM libc and `tan` is one of the missing functions.
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kbluck
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Jul 6, 2024
…7489) Using the same range reduction as `sin`, `cos`, and `sincos`: 1) Reducing `x = k*pi/128 + u`, with `|u| <= pi/256`, and `u` is in double-double. 2) Approximate `tan(u)` using degree-9 Taylor polynomial. 3) Compute ``` tan(x) ~ (sin(k*pi/128) + tan(u) * cos(k*pi/128)) / (cos(k*pi/128) - tan(u) * sin(k*pi/128)) ``` using the fast double-double division algorithm in [the CORE-MATH project](https://gitlab.inria.fr/core-math/core-math/-/blob/master/src/binary64/tan/tan.c#L1855). 4) Perform relative-error Ziv's accuracy test 5) If the accuracy tests failed, we redo the computations using 128-bit precision `DyadicFloat`. Fixes llvm#96930
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We're trying to build Pico SDK against LLVM libc and
tanis one of the missing functions.The text was updated successfully, but these errors were encountered: