llvm/llvm-project

Tracking progress for constexpr cmath (P0533R9, P1383R2)

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#139,885 建立於 2025年5月14日

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c++23c++26clang:frontenddocumentationgood first issuelibclibc++metaissue

描述

constexpr cmath papers (P0533R9, P1383R2 for C++23 and C++26 will take a while to implement.

As we plan to implement builtins in clang using llvm-libc' math functions, and then use that to implement libc++, it would be useful to have a page that tracks what builtins are implemented, what libc features are missing, and what is supported by libc++.

That would let

  • LLVM contributors coordinate more effectively
  • Let users know what they can use
  • Let other implementers synchronize (MSVC wants to use libc, and MSSTL wants to be clang compatible)

I'm not sure if the best place would be a GitHub issue or an RST file somewhere. Note that libc does an excellent job of tracking what they support https://libc.llvm.org/headers/math/index.html.

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cpp
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議題類型
documentation
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
5
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
over 1 week
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前置要求
C++LLVM internalsconstexpr functions
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
5
研究方向
Create a tracking page (either a GitHub issue or an RST file) that lists which constexpr cmath functions have builtins implemented in clang using llvm libc, which libc features are missing, and which are supported by libc++. Reference the existing libc math support page (https://libc.llvm.org/headers/math/index.html) as a model. Review the 16 comments on the issue for additional context and requirements from maintainers.